/*
 * XML Security Library (http://www.aleksey.com/xmlsec).
 *
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 *
 * Copyright (C) 2002-2022 Aleksey Sanin <aleksey@aleksey.com>. All Rights Reserved.
 */
/**
 * SECTION:keysdata
 * @Short_description: Crypto key data object functions.
 * @Stability: Stable
 *
 */

#include "globals.h"

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <libxml/tree.h>

#include <xmlsec/xmlsec.h>
#include <xmlsec/xmltree.h>
#include <xmlsec/keys.h>
#include <xmlsec/keyinfo.h>
#include <xmlsec/transforms.h>
#include <xmlsec/base64.h>
#include <xmlsec/keyinfo.h>
#include <xmlsec/errors.h>
#include <xmlsec/x509.h>

#include "cast_helpers.h"
#include "keysdata_helpers.h"

/**************************************************************************
 *
 * Global xmlSecKeyDataIds list functions
 *
 *************************************************************************/
static xmlSecPtrList xmlSecAllKeyDataIds;
static int xmlSecImportPersistKey = 0;

/**
 * xmlSecKeyDataIdsGet:
 *
 * Gets global registered key data klasses list.
 *
 * Returns: the pointer to list of all registered key data klasses.
 */
xmlSecPtrListPtr
xmlSecKeyDataIdsGet(void) {
    return(&xmlSecAllKeyDataIds);
}

/**
 * xmlSecKeyDataIdsInit:
 *
 * Initializes the key data klasses. This function is called from the
 * #xmlSecInit function and the application should not call it directly.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataIdsInit(void) {
    int ret;

    ret = xmlSecPtrListInitialize(xmlSecKeyDataIdsGet(), xmlSecKeyDataIdListId);
    if(ret < 0) {
        xmlSecInternalError("xmlSecPtrListInitialize(xmlSecKeyDataIdListId)", NULL);
        return(-1);
    }

    ret = xmlSecKeyDataIdsRegisterDefault();
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyDataIdsRegisterDefault", NULL);
        return(-1);
    }

    return(0);
}

/**
 * xmlSecKeyDataIdsShutdown:
 *
 * Shuts down the keys data klasses. This function is called from the
 * #xmlSecShutdown function and the application should not call it directly.
 */
void
xmlSecKeyDataIdsShutdown(void) {
    xmlSecPtrListFinalize(xmlSecKeyDataIdsGet());
}

/**
 * xmlSecKeyDataIdsRegister:
 * @id:                 the key data klass.
 *
 * Registers @id in the global list of key data klasses.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataIdsRegister(xmlSecKeyDataId id) {
    int ret;

    xmlSecAssert2(id != xmlSecKeyDataIdUnknown, -1);

    ret = xmlSecPtrListAdd(xmlSecKeyDataIdsGet(), (xmlSecPtr)id);
    if(ret < 0) {
        xmlSecInternalError("xmlSecPtrListAdd",
                            xmlSecKeyDataKlassGetName(id));
        return(-1);
    }

    return(0);
}

/**
 * xmlSecKeyDataIdsRegisterDefault:
 *
 * Registers default (implemented by XML Security Library)
 * key data klasses: <dsig:KeyName/> element processing klass,
 * <dsig:KeyValue/> element processing klass, ...
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataIdsRegisterDefault(void) {
    if(xmlSecKeyDataIdsRegister(xmlSecKeyDataNameId) < 0) {
        xmlSecInternalError("xmlSecKeyDataIdsRegister(xmlSecKeyDataNameId)", NULL);
        return(-1);
    }

    if(xmlSecKeyDataIdsRegister(xmlSecKeyDataValueId) < 0) {
        xmlSecInternalError("xmlSecKeyDataIdsRegister(xmlSecKeyDataValueId)", NULL);
        return(-1);
    }

    if(xmlSecKeyDataIdsRegister(xmlSecKeyDataRetrievalMethodId) < 0) {
        xmlSecInternalError("xmlSecKeyDataIdsRegister(xmlSecKeyDataRetrievalMethodId", NULL);
        return(-1);
    }

#ifndef XMLSEC_NO_XMLENC
    if(xmlSecKeyDataIdsRegister(xmlSecKeyDataEncryptedKeyId) < 0) {
        xmlSecInternalError("xmlSecKeyDataIdsRegister(xmlSecKeyDataEncryptedKeyId)", NULL);
        return(-1);
    }
#endif /* XMLSEC_NO_XMLENC */

    return(0);
}

/**************************************************************************
 *
 * xmlSecKeyData functions
 *
 *************************************************************************/
/**
 * xmlSecKeyDataCreate:
 * @id:                 the data id.
 *
 * Allocates and initializes new key data of the specified type @id.
 * Caller is responsible for destroying returned object with
 * #xmlSecKeyDataDestroy function.
 *
 * Returns: the pointer to newly allocated key data structure
 * or NULL if an error occurs.
 */
xmlSecKeyDataPtr
xmlSecKeyDataCreate(xmlSecKeyDataId id)  {
    xmlSecKeyDataPtr data;
    int ret;

    xmlSecAssert2(id != NULL, NULL);
    xmlSecAssert2(id->klassSize >= sizeof(xmlSecKeyDataKlass), NULL);
    xmlSecAssert2(id->objSize >= sizeof(xmlSecKeyData), NULL);
    xmlSecAssert2(id->name != NULL, NULL);

    /* Allocate a new xmlSecKeyData and fill the fields. */
    data = (xmlSecKeyDataPtr)xmlMalloc(id->objSize);
    if(data == NULL) {
        xmlSecMallocError(id->objSize,
                          xmlSecKeyDataKlassGetName(id));
        return(NULL);
    }
    memset(data, 0, id->objSize);
    data->id = id;

    if(id->initialize != NULL) {
        ret = (id->initialize)(data);
        if(ret < 0) {
            xmlSecInternalError("id->initialize",
                                xmlSecKeyDataKlassGetName(id));
            xmlSecKeyDataDestroy(data);
            return(NULL);
        }
    }

    return(data);
}

/**
 * xmlSecKeyDataDuplicate:
 * @data:               the pointer to the key data.
 *
 * Creates a duplicate of the given @data. Caller is responsible for
 * destroying returned object with #xmlSecKeyDataDestroy function.
 *
 * Returns: the pointer to newly allocated key data structure
 * or NULL if an error occurs.
 */
xmlSecKeyDataPtr
xmlSecKeyDataDuplicate(xmlSecKeyDataPtr data) {
    xmlSecKeyDataPtr newData;
    int ret;

    xmlSecAssert2(xmlSecKeyDataIsValid(data), NULL);
    xmlSecAssert2(data->id->duplicate != NULL, NULL);

    newData = xmlSecKeyDataCreate(data->id);
    if(newData == NULL) {
        xmlSecInternalError("xmlSecKeyDataCreate",
                            xmlSecKeyDataGetName(data));
        return(NULL);
    }

    ret = (data->id->duplicate)(newData, data);
    if(ret < 0) {
        xmlSecInternalError("id->duplicate",
                            xmlSecKeyDataGetName(data));
        xmlSecKeyDataDestroy(newData);
        return(NULL);
    }

    return(newData);
}

/**
 * xmlSecKeyDataDestroy:
 * @data:               the pointer to the key data.
 *
 * Destroys the data and frees all allocated memory.
 */
void
xmlSecKeyDataDestroy(xmlSecKeyDataPtr data) {
    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(data->id->objSize > 0);

    if(data->id->finalize != NULL) {
        (data->id->finalize)(data);
    }
    memset(data, 0, data->id->objSize);
    xmlFree(data);
}


/**
 * xmlSecKeyDataXmlRead:
 * @id:                 the data klass.
 * @key:                the destination key.
 * @node:               the pointer to an XML node.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Reads the key data of klass @id from XML @node and adds them to @key.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataXmlRead(xmlSecKeyDataId id, xmlSecKeyPtr key, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(id->xmlRead != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    return((id->xmlRead)(id, key, node, keyInfoCtx));
}

/**
 * xmlSecKeyDataXmlWrite:
 * @id:                 the data klass.
 * @key:                the source key.
 * @node:               the pointer to an XML node.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Writes the key data of klass @id from @key to an XML @node.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataXmlWrite(xmlSecKeyDataId id, xmlSecKeyPtr key, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(id->xmlWrite != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    return((id->xmlWrite)(id, key, node, keyInfoCtx));
}

/**
 * xmlSecKeyDataBinRead:
 * @id:                 the data klass.
 * @key:                the destination key.
 * @buf:                the input binary buffer.
 * @bufSize:            the input buffer size.
 * @keyInfoCtx:         the <dsig:KeyInfo/> node processing context.
 *
 * Reads the key data of klass @id from binary buffer @buf to @key.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataBinRead(xmlSecKeyDataId id, xmlSecKeyPtr key,
                    const xmlSecByte* buf, xmlSecSize bufSize,
                    xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(id->binRead != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(buf != NULL, -1);

    return((id->binRead)(id, key, buf, bufSize, keyInfoCtx));
}

/**
 * xmlSecKeyDataBinWrite:
 * @id:                 the data klass.
 * @key:                the source key.
 * @buf:                the output binary buffer.
 * @bufSize:            the output buffer size.
 * @keyInfoCtx:         the <dsig:KeyInfo/> node processing context.
 *
 * Writes the key data of klass @id from the @key to a binary buffer @buf.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataBinWrite(xmlSecKeyDataId id, xmlSecKeyPtr key,
                    xmlSecByte** buf, xmlSecSize* bufSize,
                    xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(id->binWrite != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(buf != NULL, -1);

    return((id->binWrite)(id, key, buf, bufSize, keyInfoCtx));
}

/**
 * xmlSecKeyDataGenerate:
 * @data:               the pointer to key data.
 * @sizeBits:           the desired key data size (in bits).
 * @type:               the desired key data type.
 *
 * Generates new key data of given size and type.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataGenerate(xmlSecKeyDataPtr data, xmlSecSize sizeBits,
                      xmlSecKeyDataType type) {
    int ret;

    xmlSecAssert2(xmlSecKeyDataIsValid(data), -1);
    xmlSecAssert2(data->id->generate != NULL, -1);

    /* write data */
    ret = data->id->generate(data, sizeBits, type);
    if(ret < 0) {
        xmlSecInternalError2("id->generate", xmlSecKeyDataGetName(data),
            "size=" XMLSEC_SIZE_FMT, sizeBits);
        return(-1);
    }
    return(0);
}

/**
 * xmlSecKeyDataGetType:
 * @data:               the pointer to key data.
 *
 * Gets key data type.
 *
 * Returns: key data type.
 */
xmlSecKeyDataType
xmlSecKeyDataGetType(xmlSecKeyDataPtr data) {
    xmlSecAssert2(xmlSecKeyDataIsValid(data), xmlSecKeyDataTypeUnknown);
    xmlSecAssert2(data->id->getType != NULL, xmlSecKeyDataTypeUnknown);

    return(data->id->getType(data));
}

/**
 * xmlSecKeyDataGetSize:
 * @data:               the pointer to key data.
 *
 * Gets key data size.
 *
 * Returns: key data size (in bits).
 */
xmlSecSize
xmlSecKeyDataGetSize(xmlSecKeyDataPtr data) {
    xmlSecAssert2(xmlSecKeyDataIsValid(data), 0);
    xmlSecAssert2(data->id->getSize != NULL, 0);

    return(data->id->getSize(data));
}

/**
 * xmlSecKeyDataGetIdentifier:
 * @data:               the pointer to key data.
 *
 * Gets key data identifier string.
 *
 * Returns: key data id string.
 */
const xmlChar*
xmlSecKeyDataGetIdentifier(xmlSecKeyDataPtr data) {
    xmlSecAssert2(xmlSecKeyDataIsValid(data), NULL);
    xmlSecAssert2(data->id->getIdentifier != NULL, NULL);

    return(data->id->getIdentifier(data));
}

/**
 * xmlSecKeyDataDebugDump:
 * @data:               the pointer to key data.
 * @output:             the pointer to output FILE.
 *
 * Prints key data debug info.
 */
void
xmlSecKeyDataDebugDump(xmlSecKeyDataPtr data, FILE *output) {
    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(data->id->debugDump != NULL);
    xmlSecAssert(output != NULL);

    data->id->debugDump(data, output);
}

/**
 * xmlSecKeyDataDebugXmlDump:
 * @data:               the pointer to key data.
 * @output:             the pointer to output FILE.
 *
 * Prints key data debug info in XML format.
 */
void
xmlSecKeyDataDebugXmlDump(xmlSecKeyDataPtr data, FILE *output) {
    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(data->id->debugXmlDump != NULL);
    xmlSecAssert(output != NULL);

    data->id->debugXmlDump(data, output);
}

/**************************************************************************
 *
 * xmlSecKeyDataBinary methods
 *
 *************************************************************************/

/**
 * xmlSecKeyDataBinaryValueInitialize:
 * @data:               the pointer to binary key data.
 *
 * Initializes binary key data.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueInitialize(xmlSecKeyDataPtr data) {
    xmlSecBufferPtr buffer;
    int ret;

    xmlSecAssert2(xmlSecKeyDataIsValid(data), -1);
    xmlSecAssert2(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize), -1);

    /* initialize buffer */
    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert2(buffer != NULL, -1);

    ret = xmlSecBufferInitialize(buffer, 0);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize",
                            xmlSecKeyDataGetName(data));
        return(-1);
    }

    return(0);
}

/**
 * xmlSecKeyDataBinaryValueDuplicate:
 * @dst:                the pointer to destination binary key data.
 * @src:                the pointer to source binary key data.
 *
 * Copies binary key data from @src to @dst.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueDuplicate(xmlSecKeyDataPtr dst, xmlSecKeyDataPtr src) {
    xmlSecBufferPtr buffer;
    int ret;

    xmlSecAssert2(xmlSecKeyDataIsValid(dst), -1);
    xmlSecAssert2(xmlSecKeyDataCheckSize(dst, xmlSecKeyDataBinarySize), -1);
    xmlSecAssert2(xmlSecKeyDataIsValid(src), -1);
    xmlSecAssert2(xmlSecKeyDataCheckSize(src, xmlSecKeyDataBinarySize), -1);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(src);
    xmlSecAssert2(buffer != NULL, -1);

    /* copy data */
    ret = xmlSecKeyDataBinaryValueSetBuffer(dst,
                    xmlSecBufferGetData(buffer),
                    xmlSecBufferGetSize(buffer));
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyDataBinaryValueSetBuffer",
                            xmlSecKeyDataGetName(dst));
        return(-1);
    }

    return(0);
}

/**
 * xmlSecKeyDataBinaryValueFinalize:
 * @data:               the pointer to binary key data.
 *
 * Cleans up binary key data.
 */
void
xmlSecKeyDataBinaryValueFinalize(xmlSecKeyDataPtr data) {
    xmlSecBufferPtr buffer;

    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize));

    /* initialize buffer */
    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert(buffer != NULL);

    xmlSecBufferFinalize(buffer);
}

/**
 * xmlSecKeyDataBinaryValueXmlRead:
 * @id:                 the data klass.
 * @key:                the pointer to destination key.
 * @node:               the pointer to an XML node.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Reads binary key data from @node to the key by base64 decoding the @node content.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueXmlRead(xmlSecKeyDataId id, xmlSecKeyPtr key,
                                xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlChar* str = NULL;
    xmlSecKeyDataPtr data = NULL;
    xmlSecSize decodedSize;
    int ret;
    int res = -1;

    xmlSecAssert2(id != xmlSecKeyDataIdUnknown, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    str = xmlNodeGetContent(node);
    if(str == NULL) {
        xmlSecInvalidNodeContentError(node, xmlSecKeyDataKlassGetName(id), "empty");
        goto done;
    }

    /* usual trick: decode into the same buffer */
    decodedSize = 0;
    ret = xmlSecBase64DecodeInPlace(str, &decodedSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBase64Decode_ex", xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    /* check do we have a key already */
    data = xmlSecKeyGetValue(key);
    if(data != NULL) {
        xmlSecBufferPtr buffer;

        if(!xmlSecKeyDataCheckId(data, id)) {
            xmlSecOtherError2(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST, xmlSecKeyDataGetName(data),
                "id=%s", xmlSecErrorsSafeString(xmlSecKeyDataKlassGetName(id)));
            goto done;
        }

        buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
        if(buffer != NULL) {
            if(xmlSecBufferGetSize(buffer) != decodedSize) {
                xmlSecOtherError3(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST,
                    xmlSecKeyDataGetName(data),
                    "cur-data-size=" XMLSEC_SIZE_FMT "; new-data-size=" XMLSEC_SIZE_FMT,
                    xmlSecBufferGetSize(buffer), decodedSize);
                goto done;
            }
            if((decodedSize > 0) && (memcmp(xmlSecBufferGetData(buffer), str, decodedSize) != 0)) {
                xmlSecOtherError(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST,
                    xmlSecKeyDataGetName(data),
                    "key already has a different value");
                goto done;
            }

            /* we already have exactly the same key */
            res = 0;
            goto done;
        }

        /* we have binary key value with empty buffer */
    }


    data = xmlSecKeyDataCreate(id);
    if(data == NULL ) {
        xmlSecInternalError("xmlSecKeyDataCreate", xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    ret = xmlSecKeyDataBinaryValueSetBuffer(data, (xmlSecByte*)str, decodedSize);
    if(ret < 0) {
        xmlSecInternalError2("xmlSecKeyDataBinaryValueSetBuffer",
            xmlSecKeyDataKlassGetName(id),
            "size=" XMLSEC_SIZE_FMT, decodedSize);
        goto done;
    }

    if(xmlSecKeyReqMatchKeyValue(&(keyInfoCtx->keyReq), data) != 1) {
        xmlSecInternalError("xmlSecKeyReqMatchKeyValue", xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    ret = xmlSecKeySetValue(key, data);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeySetValue", xmlSecKeyDataKlassGetName(id));
        goto done;
    }
    data = NULL; /* data is owned by key */

    /* success */
    res = 0;

done:
    if(data != NULL) {
        xmlSecKeyDataDestroy(data);
    }
    if(str != NULL) {
        xmlFree(str);
    }
    return(res);
}

/**
 * xmlSecKeyDataBinaryValueXmlWrite:
 * @id:                 the data klass.
 * @key:                the pointer to source key.
 * @node:               the pointer to an XML node.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Base64 encodes binary key data of klass @id from the @key and
 * sets to the @node content.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueXmlWrite(xmlSecKeyDataId id, xmlSecKeyPtr key,
                            xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecBufferPtr buffer;
    xmlSecKeyDataPtr value;
    xmlChar* str;

    xmlSecAssert2(id != xmlSecKeyDataIdUnknown, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    if((xmlSecKeyDataTypeSymmetric & keyInfoCtx->keyReq.keyType) == 0) {
        /* we can have only symmetric key */
        return(0);
    }

    value = xmlSecKeyGetValue(key);
    xmlSecAssert2(xmlSecKeyDataIsValid(value), -1);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(value);
    xmlSecAssert2(buffer != NULL, -1);

    str = xmlSecBase64Encode(xmlSecBufferGetData(buffer),
                             xmlSecBufferGetSize(buffer),
                             keyInfoCtx->base64LineSize);
    if(str == NULL) {
        xmlSecInternalError("xmlSecBase64Encode",
                            xmlSecKeyDataKlassGetName(id));
        return(-1);
    }
    xmlNodeSetContent(node, str);
    xmlFree(str);
    return(0);
}

/**
 * xmlSecKeyDataBinaryValueBinRead:
 * @id:                 the data klass.
 * @key:                the pointer to destination key.
 * @buf:                the source binary buffer.
 * @bufSize:            the source binary buffer size.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Reads binary key data of the klass @id from @buf to the @key.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueBinRead(xmlSecKeyDataId id, xmlSecKeyPtr key,
                                const xmlSecByte* buf, xmlSecSize bufSize,
                                xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecKeyDataPtr data;
    int ret;

    xmlSecAssert2(id != xmlSecKeyDataIdUnknown, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(buf != NULL, -1);
    xmlSecAssert2(bufSize > 0, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    /* check do we have a key already */
    data = xmlSecKeyGetValue(key);
    if(data != NULL) {
        xmlSecBufferPtr buffer;

        if(!xmlSecKeyDataCheckId(data, id)) {
            xmlSecOtherError2(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST,
                              xmlSecKeyDataGetName(data),
                              "id=%s",
                              xmlSecErrorsSafeString(xmlSecKeyDataKlassGetName(id)));
            return(-1);
        }

        buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
        if(buffer != NULL) {
            if(xmlSecBufferGetSize(buffer) != bufSize) {
                xmlSecOtherError3(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST,
                    xmlSecKeyDataGetName(data),
                    "cur-data-size=" XMLSEC_SIZE_FMT "; new-data-size=" XMLSEC_SIZE_FMT,
                    xmlSecBufferGetSize(buffer), bufSize);
                return(-1);
            }
            if((bufSize > 0) && (memcmp(xmlSecBufferGetData(buffer), buf, bufSize) != 0)) {
                xmlSecOtherError(XMLSEC_ERRORS_R_KEY_DATA_ALREADY_EXIST,
                    xmlSecKeyDataGetName(data),
                    "key already has a different value");
                return(-1);
            }

            /* we already have exactly the same key */
            return(0);
        }

        /* we have binary key value with empty buffer */
    }

    data = xmlSecKeyDataCreate(id);
    if(data == NULL ) {
        xmlSecInternalError("xmlSecKeyDataCreate", xmlSecKeyDataKlassGetName(id));
        return(-1);
    }

    ret = xmlSecKeyDataBinaryValueSetBuffer(data, buf, bufSize);
    if(ret < 0) {
        xmlSecInternalError2("xmlSecKeyDataBinaryValueSetBuffer",
            xmlSecKeyDataKlassGetName(id),
            "size=" XMLSEC_SIZE_FMT, bufSize);
        xmlSecKeyDataDestroy(data);
        return(-1);
    }

    if(xmlSecKeyReqMatchKeyValue(&(keyInfoCtx->keyReq), data) != 1) {
        xmlSecInternalError("xmlSecKeyReqMatchKeyValue",
            xmlSecKeyDataKlassGetName(id));
        xmlSecKeyDataDestroy(data);
        return(0);
    }

    ret = xmlSecKeySetValue(key, data);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeySetValue",
            xmlSecKeyDataKlassGetName(id));
        xmlSecKeyDataDestroy(data);
        return(-1);
    }

    return(0);
}

/**
 * xmlSecKeyDataBinaryValueBinWrite:
 * @id:                 the data klass.
 * @key:                the pointer to source key.
 * @buf:                the destination binary buffer.
 * @bufSize:            the destination binary buffer size.
 * @keyInfoCtx:         the pointer to <dsig:KeyInfo/> element processing context.
 *
 * Writes binary key data of klass @id from the @key to @buf.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueBinWrite(xmlSecKeyDataId id, xmlSecKeyPtr key,
                                xmlSecByte** buf, xmlSecSize* bufSize,
                                xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlSecKeyDataPtr value;
    xmlSecBufferPtr buffer;

    xmlSecAssert2(id != xmlSecKeyDataIdUnknown, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(buf != NULL, -1);
    xmlSecAssert2(bufSize != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    if((xmlSecKeyDataTypeSymmetric & keyInfoCtx->keyReq.keyType) == 0) {
        /* we can have only symmetric key */
        return(0);
    }

    value = xmlSecKeyGetValue(key);
    xmlSecAssert2(xmlSecKeyDataIsValid(value), -1);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(key->value);
    xmlSecAssert2(buffer != NULL, -1);

    (*bufSize) = xmlSecBufferGetSize(buffer);
    (*buf) = (xmlSecByte*) xmlMalloc((*bufSize));
    if((*buf) == NULL) {
        xmlSecMallocError((*bufSize),
                          xmlSecKeyDataKlassGetName(id));
        return(-1);
    }
    memcpy((*buf), xmlSecBufferGetData(buffer), (*bufSize));
    return(0);
}

/**
 * xmlSecKeyDataBinaryValueDebugDump:
 * @data:               the pointer to binary key data.
 * @output:             the pointer to output FILE.
 *
 * Prints binary key data debug information to @output.
 */
void
xmlSecKeyDataBinaryValueDebugDump(xmlSecKeyDataPtr data, FILE* output) {
    xmlSecBufferPtr buffer;

    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize));
    xmlSecAssert(data->id->dataNodeName != NULL);
    xmlSecAssert(output != NULL);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert(buffer != NULL);

    /* print only size, everything else is sensitive */
    fprintf(output, "=== %s: size=" XMLSEC_SIZE_FMT "\n",
        data->id->dataNodeName, xmlSecKeyDataGetSize(data));
}

/**
 * xmlSecKeyDataBinaryValueDebugXmlDump:
 * @data:               the pointer to binary key data.
 * @output:             the pointer to output FILE.
 *
 * Prints binary key data debug information to @output in XML format.
 */
void
xmlSecKeyDataBinaryValueDebugXmlDump(xmlSecKeyDataPtr data, FILE* output) {
    xmlSecBufferPtr buffer;

    xmlSecAssert(xmlSecKeyDataIsValid(data));
    xmlSecAssert(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize));
    xmlSecAssert(data->id->dataNodeName != NULL);
    xmlSecAssert(output != NULL);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert(buffer != NULL);

    /* print only size, everything else is sensitive */
    fprintf(output, "<%s size=\"" XMLSEC_SIZE_FMT "\" />\n",
        data->id->dataNodeName, xmlSecKeyDataGetSize(data));
}

/**
 * xmlSecKeyDataBinaryValueGetSize:
 * @data:               the pointer to binary key data.
 *
 * Gets the binary key data size.
 *
 * Returns: binary key data size in bits.
 */
xmlSecSize
xmlSecKeyDataBinaryValueGetSize(xmlSecKeyDataPtr data) {
    xmlSecBufferPtr buffer;

    xmlSecAssert2(xmlSecKeyDataIsValid(data), 0);
    xmlSecAssert2(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize), 0);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert2(buffer != NULL, 0);

    /* return size in bits */
    return(8 * xmlSecBufferGetSize(buffer));
}

/**
 * xmlSecKeyDataBinaryValueGetBuffer:
 * @data:               the pointer to binary key data.
 *
 * Gets the binary key data buffer.
 *
 * Returns: pointer to binary key data buffer.
 */
xmlSecBufferPtr
xmlSecKeyDataBinaryValueGetBuffer(xmlSecKeyDataPtr data) {
    xmlSecAssert2(xmlSecKeyDataIsValid(data), NULL);
    xmlSecAssert2(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize), NULL);

    return(&(((xmlSecKeyDataBinary *)data)->buffer));
}

/**
 * xmlSecKeyDataBinaryValueSetBuffer:
 * @data:               the pointer to binary key data.
 * @buf:                the pointer to binary buffer.
 * @bufSize:            the binary buffer size.
 *
 * Sets the value of @data to @buf.
 *
 * Returns: 0 on success or a negative value otherwise.
 */
int
xmlSecKeyDataBinaryValueSetBuffer(xmlSecKeyDataPtr data,
                        const xmlSecByte* buf, xmlSecSize bufSize) {
    xmlSecBufferPtr buffer;

    xmlSecAssert2(xmlSecKeyDataIsValid(data), -1);
    xmlSecAssert2(xmlSecKeyDataCheckSize(data, xmlSecKeyDataBinarySize), -1);
    xmlSecAssert2(buf != NULL, -1);
    xmlSecAssert2(bufSize > 0, -1);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(data);
    xmlSecAssert2(buffer != NULL, -1);

    return(xmlSecBufferSetData(buffer, buf, bufSize));
}

#if !defined(XMLSEC_NO_DSA)
/**************************************************************************
 *
 * Helper functions to read/write DSA keys
 *
 *************************************************************************/
#define XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE                               512

static int                      xmlSecKeyValueDsaInitialize             (xmlSecKeyValueDsaPtr data);
static void                     xmlSecKeyValueDsaFinalize               (xmlSecKeyValueDsaPtr data);
static int                      xmlSecKeyValueDsaXmlRead                (xmlSecKeyValueDsaPtr data,
                                                                         xmlNodePtr node);
static int                      xmlSecKeyValueDsaXmlWrite               (xmlSecKeyValueDsaPtr data,
                                                                         xmlNodePtr node,
                                                                         int writePrivateKey,
                                                                         int base64LineSize,
                                                                         int addLineBreaks);

/**
 * xmlSecKeyDataDsaXmlRead:
 * @id:                 the data id.
 * @key:                the key.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo/> node processing context.
 * @readFunc:           the pointer to the function that converts
 *                      @xmlSecKeyValueDsa to @xmlSecKeyData.
 *
 * DSA Key data method for reading XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataDsaXmlRead(xmlSecKeyDataId id, xmlSecKeyPtr key,
                        xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx,
                        xmlSecKeyDataDsaRead readFunc) {
    xmlSecKeyDataPtr data = NULL;
    xmlSecKeyValueDsa dsaValue;
    int dsaDataInitialized = 0;
    int res = -1;
    int ret;

    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(readFunc != NULL, -1);

    if(xmlSecKeyGetValue(key) != NULL) {
        xmlSecOtherError(XMLSEC_ERRORS_R_INVALID_KEY_DATA,
            xmlSecKeyDataKlassGetName(id), "key already has a value");
        goto done;
    }

    ret = xmlSecKeyValueDsaInitialize(&dsaValue);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueDsaInitialize",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }
    dsaDataInitialized = 1;

    ret = xmlSecKeyValueDsaXmlRead(&dsaValue, node);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueDsaXmlRead",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    data = readFunc(id, &dsaValue);
    if(data == NULL) {
        xmlSecInternalError("xmlSecKeyDataDsaRead",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    /* set key value */
    ret = xmlSecKeySetValue(key, data);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeySetValue",
                            xmlSecKeyDataGetName(data));
        goto done;
    }
    data = NULL; /* data is owned by key now */

    /* success */
    res = 0;

done:
    /* cleanup */
    if(dsaDataInitialized != 0) {
        xmlSecKeyValueDsaFinalize(&dsaValue);
    }
    if(data != NULL) {
        xmlSecKeyDataDestroy(data);
    }
    return(res);
}

/**
 * xmlSecKeyDataDsaXmlWrite:
 * @id:                 the data id.
 * @key:                the key.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo> node processing context.
 * @base64LineSize:     the base64 max line size.
 * @addLineBreaks:      the flag indicating if we need to add line breaks around base64 output.
 * @writeFunc:          the pointer to the function that converts
 *                      @xmlSecKeyData to  @xmlSecKeyValueDsa.
 *
 * DSA Key data  method for writing XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataDsaXmlWrite(xmlSecKeyDataId id, xmlSecKeyPtr key,
                        xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx,
                        int base64LineSize, int addLineBreaks,
                        xmlSecKeyDataDsaWrite writeFunc) {
    xmlSecKeyDataPtr data;
    xmlSecKeyValueDsa dsaValue;
    int dsaDataInitialized = 0;
    int writePrivateKey = 0;
    int res = -1;
    int ret;

    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(writeFunc != NULL, -1);
    xmlSecAssert2(base64LineSize > 0, -1);

    if(((xmlSecKeyDataTypePublic | xmlSecKeyDataTypePrivate) & keyInfoCtx->keyReq.keyType) == 0) {
        /* we can have only private key or public key */
        return(0);
    }
    if((keyInfoCtx->keyReq.keyType & xmlSecKeyDataTypePrivate) != 0) {
        writePrivateKey = 1;
    }

    data = xmlSecKeyGetValue(key);
    if(data == NULL) {
        xmlSecOtherError(XMLSEC_ERRORS_R_INVALID_KEY_DATA,
            xmlSecKeyDataKlassGetName(id), "key has no value");
        goto done;
    }

    ret = xmlSecKeyValueDsaInitialize(&dsaValue);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueDsaInitialize",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }
    dsaDataInitialized = 1;

    ret = writeFunc(id, data, &dsaValue, writePrivateKey);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyDataDsaWrite",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    ret = xmlSecKeyValueDsaXmlWrite(&dsaValue, node, writePrivateKey,
        base64LineSize, addLineBreaks);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueDsaXmlWrite",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(dsaDataInitialized != 0) {
        xmlSecKeyValueDsaFinalize(&dsaValue);
    }
    return(res);
}

static int
xmlSecKeyValueDsaInitialize(xmlSecKeyValueDsaPtr data) {
    int ret;

    xmlSecAssert2(data != NULL, -1);
    memset(data, 0, sizeof(xmlSecKeyValueDsa));

    ret = xmlSecBufferInitialize(&(data->p), XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(p)", NULL);
        xmlSecKeyValueDsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->q), XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(q)", NULL);
        xmlSecKeyValueDsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->g), XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(g)", NULL);
        xmlSecKeyValueDsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->x), XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(x)", NULL);
        xmlSecKeyValueDsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->y), XMLSEC_KEY_DATA_DSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(y)", NULL);
        xmlSecKeyValueDsaFinalize(data);
        return(-1);
    }

    return(0);
}

static void
xmlSecKeyValueDsaFinalize(xmlSecKeyValueDsaPtr data) {
    xmlSecAssert(data != NULL);

    xmlSecBufferFinalize(&(data->p));
    xmlSecBufferFinalize(&(data->q));
    xmlSecBufferFinalize(&(data->g));
    xmlSecBufferFinalize(&(data->x));
    xmlSecBufferFinalize(&(data->y));
    memset(data, 0, sizeof(xmlSecKeyValueDsa));
}

static int
xmlSecKeyValueDsaXmlRead(xmlSecKeyValueDsaPtr data, xmlNodePtr node) {
    xmlNodePtr cur;
    int ret;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    cur = xmlSecGetNextElementNode(node->children);

    /* first is P node. It is REQUIRED because we do not support Seed and PgenCounter*/
    if((cur == NULL) || (!xmlSecCheckNodeName(cur,  xmlSecNodeDSAP, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAP, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->p), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(p)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* next is Q node. It is REQUIRED because we do not support Seed and PgenCounter*/
    if((cur == NULL) || (!xmlSecCheckNodeName(cur, xmlSecNodeDSAQ, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAQ, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->q), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(q)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* next is G node. It is REQUIRED because we do not support Seed and PgenCounter*/
    if((cur == NULL) || (!xmlSecCheckNodeName(cur, xmlSecNodeDSAG, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAG, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->g), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(g)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    if((cur != NULL) && (xmlSecCheckNodeName(cur, xmlSecNodeDSAX, xmlSecNs))) {
        /* next is X node. It is REQUIRED for private key but
         * we are not sure exactly what do we read */
        ret = xmlSecBufferBase64NodeContentRead(&(data->x), cur);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferBase64NodeContentRead(x)", NULL);
            return(-1);
        }
        cur = xmlSecGetNextElementNode(cur->next);
    } else {
        /* make sure it's empty */
        ret = xmlSecBufferSetSize(&(data->x), 0);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferSetSize(0)", NULL);
            return(-1);
        }
    }

    /* next is Y node. */
    if((cur == NULL) || (!xmlSecCheckNodeName(cur, xmlSecNodeDSAY, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAY, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->y), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(y)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* todo: add support for J */
    if((cur != NULL) && (xmlSecCheckNodeName(cur, xmlSecNodeDSAJ, xmlSecDSigNs))) {
        cur = xmlSecGetNextElementNode(cur->next);
    }

    /* todo: add support for seed */
    if((cur != NULL) && (xmlSecCheckNodeName(cur, xmlSecNodeDSASeed, xmlSecDSigNs))) {
        cur = xmlSecGetNextElementNode(cur->next);
    }

    /* todo: add support for pgencounter */
    if((cur != NULL) && (xmlSecCheckNodeName(cur, xmlSecNodeDSAPgenCounter, xmlSecDSigNs))) {
        cur = xmlSecGetNextElementNode(cur->next);
    }

    if(cur != NULL) {
        xmlSecUnexpectedNodeError(cur, NULL);
        return(-1);
    }

    /* success */
    return(0);
}

static int
xmlSecKeyValueDsaXmlWrite(xmlSecKeyValueDsaPtr data, xmlNodePtr node,
                      int writePrivateKey, int base64LineSize, int addLineBreaks) {
    xmlNodePtr cur;
    int ret;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    /* first is P node */
    cur = xmlSecAddChild(node, xmlSecNodeDSAP, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(NodeDSAP)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->p), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(p)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* next is Q node. */
    cur = xmlSecAddChild(node, xmlSecNodeDSAQ, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(NodeDSAQ)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->q), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(q)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* next is G node. */
    cur = xmlSecAddChild(node, xmlSecNodeDSAG, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(NodeDSAG)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->g), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(g)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* next is X node: write it ONLY for private keys and ONLY if it is requested */
    if((writePrivateKey != 0) && (xmlSecBufferGetSize(&(data->x)) > 0)) {
        cur = xmlSecAddChild(node, xmlSecNodeDSAX, xmlSecNs);
        if(cur == NULL) {
            xmlSecInternalError("xmlSecAddChild(NodeDSAX)", NULL);
            return(-1);
        }
        if(addLineBreaks) {
            xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
        } else {
            xmlNodeSetContent(cur, xmlSecStringEmpty);
        }
        ret = xmlSecBufferBase64NodeContentWrite(&(data->x), cur, base64LineSize);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(x)", NULL);
            return(-1);
        }
        if(addLineBreaks) {
            xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
        }
    }

    /* next is Y node. */
    cur = xmlSecAddChild(node, xmlSecNodeDSAY, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(NodeDSAY)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->y), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(y)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    return(0);
}
#endif /* !defined(XMLSEC_NO_DSA) */


#if !defined(XMLSEC_NO_RSA)
/**************************************************************************
 *
 * Helper functions to read/write RSA keys
 *
 *************************************************************************/
#define XMLSEC_KEY_DATA_RSA_INIT_BUF_SIZE     512

static int                      xmlSecKeyValueRsaInitialize             (xmlSecKeyValueRsaPtr data);
static void                     xmlSecKeyValueRsaFinalize               (xmlSecKeyValueRsaPtr data);
static int                      xmlSecKeyValueRsaXmlRead                (xmlSecKeyValueRsaPtr data,
                                                                         xmlNodePtr node);
static int                      xmlSecKeyValueRsaXmlWrite               (xmlSecKeyValueRsaPtr data,
                                                                         xmlNodePtr node,
                                                                         int writePrivateKey,
                                                                         int base64LineSize,
                                                                         int addLineBreaks);

/**
 * xmlSecKeyDataRsaXmlRead:
 * @id:                 the data id.
 * @key:                the key.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo/> node processing context.
 * @readFunc:           the pointer to the function that converts
 *                      @xmlSecKeyValueRsa to @xmlSecKeyData.
 *
 * DSA Key data method for reading XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataRsaXmlRead(xmlSecKeyDataId id, xmlSecKeyPtr key,
                        xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx,
                        xmlSecKeyDataRsaRead readFunc) {
    xmlSecKeyDataPtr data = NULL;
    xmlSecKeyValueRsa rsaValue;
    int rsaDataInitialized = 0;
    int res = -1;
    int ret;

    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(readFunc != NULL, -1);

    if(xmlSecKeyGetValue(key) != NULL) {
        xmlSecOtherError(XMLSEC_ERRORS_R_INVALID_KEY_DATA,
            xmlSecKeyDataKlassGetName(id), "key already has a value");
        goto done;
    }

    ret = xmlSecKeyValueRsaInitialize(&rsaValue);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueRsaInitialize",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }
    rsaDataInitialized = 1;

    ret = xmlSecKeyValueRsaXmlRead(&rsaValue, node);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueRsaXmlRead",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    data = readFunc(id, &rsaValue);
    if(data == NULL) {
        xmlSecInternalError("xmlSecKeyDataRsaRead",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    /* set key value */
    ret = xmlSecKeySetValue(key, data);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeySetValue",
                            xmlSecKeyDataGetName(data));
        goto done;
    }
    data = NULL; /* data is owned by key now */

    /* success */
    res = 0;

done:
    /* cleanup */
    if(rsaDataInitialized != 0) {
        xmlSecKeyValueRsaFinalize(&rsaValue);
    }
    if(data != NULL) {
        xmlSecKeyDataDestroy(data);
    }
    return(res);
}

/**
 * xmlSecKeyDataRsaXmlWrite:
 * @id:                 the data id.
 * @key:                the key.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo> node processing context.
 * @base64LineSize:     the base64 max line size.
 * @addLineBreaks:      the flag indicating if we need to add line breaks around base64 output.
 * @writeFunc:          the pointer to the function that converts
 *                      @xmlSecKeyData to  @xmlSecKeyValueRsa.
 *
 * DSA Key data  method for writing XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataRsaXmlWrite(xmlSecKeyDataId id, xmlSecKeyPtr key,
                        xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx,
                        int base64LineSize, int addLineBreaks,
                        xmlSecKeyDataRsaWrite writeFunc) {
    xmlSecKeyDataPtr data;
    xmlSecKeyValueRsa rsaValue;
    int rsaDataInitialized = 0;
    int writePrivateKey = 0;
    int res = -1;
    int ret;

    xmlSecAssert2(id != NULL, -1);
    xmlSecAssert2(key != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(writeFunc != NULL, -1);
    xmlSecAssert2(base64LineSize > 0, -1);

    if(((xmlSecKeyDataTypePublic | xmlSecKeyDataTypePrivate) & keyInfoCtx->keyReq.keyType) == 0) {
        /* we can only write private key or public key */
        return(0);
    }
    if((keyInfoCtx->keyReq.keyType & xmlSecKeyDataTypePrivate) != 0) {
        writePrivateKey = 1;
    }

    data = xmlSecKeyGetValue(key);
    if(data == NULL) {
        xmlSecOtherError(XMLSEC_ERRORS_R_INVALID_KEY_DATA,
            xmlSecKeyDataKlassGetName(id), "key has no value");
        goto done;
    }

    ret = xmlSecKeyValueRsaInitialize(&rsaValue);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueRsaInitialize",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }
    rsaDataInitialized = 1;

    ret = writeFunc(id, data, &rsaValue, writePrivateKey);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyDataRsaWrite",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    ret = xmlSecKeyValueRsaXmlWrite(&rsaValue, node, writePrivateKey,
        base64LineSize, addLineBreaks);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueRsaXmlWrite",
            xmlSecKeyDataKlassGetName(id));
        goto done;
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(rsaDataInitialized != 0) {
        xmlSecKeyValueRsaFinalize(&rsaValue);
    }
    return(res);
}

static int
xmlSecKeyValueRsaInitialize(xmlSecKeyValueRsaPtr data) {
    int ret;

    xmlSecAssert2(data != NULL, -1);
    memset(data, 0, sizeof(xmlSecKeyValueRsa));

    ret = xmlSecBufferInitialize(&(data->modulus), XMLSEC_KEY_DATA_RSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(modulus)", NULL);
        xmlSecKeyValueRsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->publicExponent), XMLSEC_KEY_DATA_RSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(q)", NULL);
        xmlSecKeyValueRsaFinalize(data);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(data->privateExponent), XMLSEC_KEY_DATA_RSA_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(g)", NULL);
        xmlSecKeyValueRsaFinalize(data);
        return(-1);
    }
    return(0);
}

static void
xmlSecKeyValueRsaFinalize(xmlSecKeyValueRsaPtr data) {
    xmlSecAssert(data != NULL);

    xmlSecBufferFinalize(&(data->modulus));
    xmlSecBufferFinalize(&(data->publicExponent));
    xmlSecBufferFinalize(&(data->privateExponent));
    memset(data, 0, sizeof(xmlSecKeyValueRsa));
}

static int
xmlSecKeyValueRsaXmlRead(xmlSecKeyValueRsaPtr data, xmlNodePtr node) {
    xmlNodePtr cur;
    int ret;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    cur = xmlSecGetNextElementNode(node->children);

    /* first is REQUIRED  Modulus node. */
    if((cur == NULL) || (!xmlSecCheckNodeName(cur,  xmlSecNodeRSAModulus, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAP, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->modulus), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(p)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* next is REQUIRED Exponent node. */
    if((cur == NULL) || (!xmlSecCheckNodeName(cur, xmlSecNodeRSAExponent, xmlSecDSigNs))) {
        xmlSecInvalidNodeError(cur, xmlSecNodeDSAQ, NULL);
        return(-1);
    }
    ret = xmlSecBufferBase64NodeContentRead(&(data->publicExponent), cur);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentRead(q)", NULL);
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* next is PrivateExponent node. It is REQUIRED for private key but
    * we are not sure exactly what are we reading */
    if((cur != NULL) && (xmlSecCheckNodeName(cur, xmlSecNodeRSAPrivateExponent, xmlSecNs))) {
        ret = xmlSecBufferBase64NodeContentRead(&(data->privateExponent), cur);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferBase64NodeContentRead(x)", NULL);
            return(-1);
        }
        cur = xmlSecGetNextElementNode(cur->next);
    } else {
        /* make sure it's empty */
        ret = xmlSecBufferSetSize(&(data->privateExponent), 0);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferSetSize(0)", NULL);
            return(-1);
        }
    }

    if(cur != NULL) {
        xmlSecUnexpectedNodeError(cur, NULL);
        return(-1);
    }

    /* success */
    return(0);
}

static int
xmlSecKeyValueRsaXmlWrite(xmlSecKeyValueRsaPtr data, xmlNodePtr node,
                      int writePrivateKey, int base64LineSize, int addLineBreaks) {
    xmlNodePtr cur;
    int ret;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    /* first is Modulus node */
    cur = xmlSecAddChild(node, xmlSecNodeRSAModulus, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(Modulus)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->modulus), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(modulus)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* next is Exponent node. */
    cur = xmlSecAddChild(node, xmlSecNodeRSAExponent, xmlSecDSigNs);
    if(cur == NULL) {
        xmlSecInternalError("xmlSecAddChild(Exponent)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
    } else {
        xmlNodeSetContent(cur, xmlSecStringEmpty);
    }
    ret = xmlSecBufferBase64NodeContentWrite(&(data->publicExponent), cur, base64LineSize);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(exponent)", NULL);
        return(-1);
    }
    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* next is PrivateExponent node: write it ONLY for private keys and ONLY if it is requested */
    if((writePrivateKey != 0) && (xmlSecBufferGetSize(&(data->privateExponent)) > 0)) {
        cur = xmlSecAddChild(node, xmlSecNodeRSAPrivateExponent, xmlSecNs);
        if(cur == NULL) {
            xmlSecInternalError("xmlSecAddChild(PrivateExponent)", NULL);
            return(-1);
        }
        if(addLineBreaks) {
            xmlNodeSetContent(cur, xmlSecGetDefaultLineFeed());
        } else {
            xmlNodeSetContent(cur, xmlSecStringEmpty);
        }
        ret = xmlSecBufferBase64NodeContentWrite(&(data->privateExponent), cur, base64LineSize);
        if(ret < 0) {
            xmlSecInternalError("xmlSecBufferBase64NodeContentWrite(privateExponent)", NULL);
            return(-1);
        }
        if(addLineBreaks) {
            xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
        }
    }

    return(0);
}
#endif /* !defined(XMLSEC_NO_RSA) */


#if !defined(XMLSEC_NO_X509)
/**************************************************************************
 *
 * Helper functions to read/write <dsig:X509Data>
 *
 *
 * The X509Data Element (http://www.w3.org/TR/xmldsig-core/#sec-X509Data)
 *
 * An X509Data element within KeyInfo contains one or more identifiers of keys
 * or X509 certificates (or certificates' identifiers or a revocation list).
 * The content of X509Data is:
 *
 *  1. At least one element, from the following set of element types; any of these may appear together or more than once iff (if and only if) each instance describes or is related to the same certificate:
 *  2.
 *    * The X509IssuerSerial element, which contains an X.509 issuer
 *      distinguished name/serial number pair that SHOULD be compliant
 *      with RFC2253 [LDAP-DN],
 *    * The X509SubjectName element, which contains an X.509 subject
 *      distinguished name that SHOULD be compliant with RFC2253 [LDAP-DN],
 *    * The X509SKI element, which contains the base64 encoded plain (i.e.
 *      non-DER-encoded) value of a X509 V.3 SubjectKeyIdentifier extension.
 *    * The X509Certificate element, which contains a base64-encoded [X509v3]
 *      certificate, and
 *    * Elements from an external namespace which accompanies/complements any
 *      of the elements above.
 *    * The X509CRL element, which contains a base64-encoded certificate
 *      revocation list (CRL) [X509v3].
 *
 * Any X509IssuerSerial, X509SKI, and X509SubjectName elements that appear
 * MUST refer to the certificate or certificates containing the validation key.
 * All such elements that refer to a particular individual certificate MUST be
 * grouped inside a single X509Data element and if the certificate to which
 * they refer appears, it MUST also be in that X509Data element.
 *
 * Any X509IssuerSerial, X509SKI, and X509SubjectName elements that relate to
 * the same key but different certificates MUST be grouped within a single
 * KeyInfo but MAY occur in multiple X509Data elements.
 *
 * All certificates appearing in an X509Data element MUST relate to the
 * validation key by either containing it or being part of a certification
 * chain that terminates in a certificate containing the validation key.
 *
 * No ordering is implied by the above constraints.
 *
 * Note, there is no direct provision for a PKCS#7 encoded "bag" of
 * certificates or CRLs. However, a set of certificates and CRLs can occur
 * within an X509Data element and multiple X509Data elements can occur in a
 * KeyInfo. Whenever multiple certificates occur in an X509Data element, at
 * least one such certificate must contain the public key which verifies the
 * signature.
 *
 * Schema Definition
 *
 *  <element name="X509Data" type="ds:X509DataType"/>
 *  <complexType name="X509DataType">
 *    <sequence maxOccurs="unbounded">
 *      <choice>
 *        <element name="X509IssuerSerial" type="ds:X509IssuerSerialType"/>
 *        <element name="X509SKI" type="base64Binary"/>
 *        <element name="X509SubjectName" type="string"/>
 *        <element name="X509Certificate" type="base64Binary"/>
 *        <element name="X509CRL" type="base64Binary"/>
 *        <any namespace="##other" processContents="lax"/>
 *      </choice>
 *    </sequence>
 *  </complexType>
 *  <complexType name="X509IssuerSerialType">
 *    <sequence>
 *       <element name="X509IssuerName" type="string"/>
 *       <element name="X509SerialNumber" type="integer"/>
 *     </sequence>
 *  </complexType>
 *
 *  DTD
 *
 *    <!ELEMENT X509Data ((X509IssuerSerial | X509SKI | X509SubjectName |
 *                          X509Certificate | X509CRL)+ %X509.ANY;)>
 *    <!ELEMENT X509IssuerSerial (X509IssuerName, X509SerialNumber) >
 *    <!ELEMENT X509IssuerName (#PCDATA) >
 *    <!ELEMENT X509SubjectName (#PCDATA) >
 *    <!ELEMENT X509SerialNumber (#PCDATA) >
 *    <!ELEMENT X509SKI (#PCDATA) >
 *    <!ELEMENT X509Certificate (#PCDATA) >
 *    <!ELEMENT X509CRL (#PCDATA) >
 *
 *************************************************************************/
#define XMLSEC_KEY_DATA_X509_INIT_BUF_SIZE     512

static int                      xmlSecKeyValueX509Initialize            (xmlSecKeyValueX509Ptr x509Value);
static void                     xmlSecKeyValueX509Finalize              (xmlSecKeyValueX509Ptr x509Value);
static void                     xmlSecKeyValueX509Reset                 (xmlSecKeyValueX509Ptr x509Value);
static int                      xmlSecKeyValueX509XmlRead               (xmlSecKeyValueX509Ptr x509Value,
                                                                         xmlNodePtr node,
                                                                         xmlSecKeyInfoCtxPtr keyInfoCtx);
static int                      xmlSecKeyValueX509XmlWrite              (xmlSecKeyValueX509Ptr x509Value,
                                                                         xmlNodePtr node,
                                                                         int base64LineSize,
                                                                         int addLineBreaks);

/**
 * xmlSecKeyDataX509XmlRead:
 * @data:               the x509 key data.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo/> node processing context.
 * @readFunc:           the pointer to the function that converts
 *                      @xmlSecKeyValueX509 to @xmlSecKeyData.
 *
 * X509 Key data method for reading XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataX509XmlRead(xmlSecKeyDataPtr data, xmlNodePtr node,
                         xmlSecKeyInfoCtxPtr keyInfoCtx,
                         xmlSecKeyDataX509Read readFunc) {
    xmlSecKeyValueX509 x509Value;
    int x509ValueInitialized = 0;
    xmlNodePtr cur;
    int res = -1;
    int ret;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(keyInfoCtx->keysMngr != NULL, -1);
    xmlSecAssert2(readFunc != NULL, -1);

    ret = xmlSecKeyValueX509Initialize(&x509Value);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueX509Initialize",
            xmlSecKeyDataGetName(data));
        goto done;
    }
    x509ValueInitialized = 1;

    for(cur = xmlSecGetNextElementNode(node->children); cur != NULL; cur = xmlSecGetNextElementNode(cur->next)) {
        ret = xmlSecKeyValueX509XmlRead(&x509Value, cur, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlRead",
                xmlSecKeyDataGetName(data));
            goto done;
        }

        ret = readFunc(data, &x509Value, keyInfoCtx->keysMngr, keyInfoCtx->flags);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyDataX509Read",
                xmlSecKeyDataGetName(data));
            goto done;
        }

        /* cleanup for the next node */
        xmlSecKeyValueX509Reset(&x509Value);
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(x509ValueInitialized != 0) {
        xmlSecKeyValueX509Finalize(&x509Value);
    }

    return(res);
}

/**
 * xmlSecKeyDataDsaXmlWrite:
 * @data:               the x509 key data.
 * @x509ObjNum:         the number of X509 objects in @data.
 * @node:               the pointer to data's value XML node.
 * @keyInfoCtx:         the <dsig:KeyInfo> node processing context.
 * @base64LineSize:     the base64 max line size.
 * @addLineBreaks:      the flag indicating if we need to add line breaks around base64 output.
 * @writeFunc:          the pointer to the function that converts
 *                      @xmlSecKeyData to  @xmlSecKeyValueDsa.
 *
 * DSA Key data  method for writing XML node.
 *
 * Returns: 0 on success or a negative value if an error occurs.
 */
int
xmlSecKeyDataX509XmlWrite(xmlSecKeyDataPtr data, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx,
                          int base64LineSize, int addLineBreaks,
                          xmlSecKeyDataX509Write writeFunc, void* writeFuncContext) {
    xmlSecKeyValueX509 x509Value;
    int x509ValueInitialized = 0;
    int content;
    int ret;
    int res = -1;

    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);
    xmlSecAssert2(base64LineSize > 0, -1);
    xmlSecAssert2(writeFunc != NULL, -1);

    if(((xmlSecKeyDataTypePublic) & keyInfoCtx->keyReq.keyType) == 0) {
        /* we can only write public key */
        return(0);
    }

    content = xmlSecX509DataGetNodeContent(node, keyInfoCtx);
    if (content < 0) {
        xmlSecInternalError2("xmlSecX509DataGetNodeContent",
            xmlSecKeyDataGetName(data), "content=%d", content);
        goto done;
    } else if(content == 0) {
        /* by default we are writing certificates and crls */
        content = XMLSEC_X509DATA_DEFAULT;
    }

    ret = xmlSecKeyValueX509Initialize(&x509Value);
    if(ret < 0) {
        xmlSecInternalError("xmlSecKeyValueX509Initialize",
            xmlSecKeyDataGetName(data));
        goto done;
    }
    x509ValueInitialized = 1;

    while(1) {
        ret = writeFunc(data, &x509Value, content, writeFuncContext);
        if(ret < 0) {
            xmlSecInternalError("writeFunc",
                xmlSecKeyDataGetName(data));
            goto done;
        } else if (ret == 1) {
            break;
        }

        ret = xmlSecKeyValueX509XmlWrite(&x509Value, node, base64LineSize, addLineBreaks);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlWrite",
                xmlSecKeyDataGetName(data));
            goto done;
        }

         /* cleanup for the next obj */
        xmlSecKeyValueX509Reset(&x509Value);
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(x509ValueInitialized != 0) {
        xmlSecKeyValueX509Finalize(&x509Value);
    }

    return(res);
}

static int
xmlSecKeyValueX509Initialize(xmlSecKeyValueX509Ptr x509Value) {
    int ret;

    xmlSecAssert2(x509Value != NULL, -1);
    memset(x509Value, 0, sizeof(xmlSecKeyValueX509));

    ret = xmlSecBufferInitialize(&(x509Value->cert), XMLSEC_KEY_DATA_X509_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(cert)", NULL);
        xmlSecKeyValueX509Finalize(x509Value);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(x509Value->crl), XMLSEC_KEY_DATA_X509_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(crl)", NULL);
        xmlSecKeyValueX509Finalize(x509Value);
        return(-1);
    }
    ret = xmlSecBufferInitialize(&(x509Value->ski), XMLSEC_KEY_DATA_X509_INIT_BUF_SIZE);
    if(ret < 0) {
        xmlSecInternalError("xmlSecBufferInitialize(ski)", NULL);
        xmlSecKeyValueX509Finalize(x509Value);
        return(-1);
    }
    return(0);
}

static void
xmlSecKeyValueX509Finalize(xmlSecKeyValueX509Ptr x509Value) {
    xmlSecAssert(x509Value != NULL);

    xmlSecBufferFinalize(&(x509Value->cert));
    xmlSecBufferFinalize(&(x509Value->crl));
    xmlSecBufferFinalize(&(x509Value->ski));
    if(x509Value->subject != NULL) {
        xmlFree(x509Value->subject);
    }
    if(x509Value->issuerName != NULL) {
        xmlFree(x509Value->issuerName);
    }
    if(x509Value->issuerSerial != NULL) {
        xmlFree(x509Value->issuerSerial);
    }
    memset(x509Value, 0, sizeof(xmlSecKeyValueX509));
}

static void
xmlSecKeyValueX509Reset(xmlSecKeyValueX509Ptr x509Value) {
    xmlSecAssert(x509Value != NULL);

    xmlSecBufferEmpty(&(x509Value->cert));
    xmlSecBufferEmpty(&(x509Value->crl));
    xmlSecBufferEmpty(&(x509Value->ski));
    if(x509Value->subject != NULL) {
        xmlFree(x509Value->subject);
        x509Value->subject = NULL;
    }
    if(x509Value->issuerName != NULL) {
        xmlFree(x509Value->issuerName);
        x509Value->issuerName = NULL;
    }
    if(x509Value->issuerSerial != NULL) {
        xmlFree(x509Value->issuerSerial);
        x509Value->issuerSerial = NULL;
    }
}

static int
xmlSecKeyValueX509XmlReadBase64Blob(xmlSecBufferPtr buf, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlChar *content;
    xmlSecSize decodedSize;
    int ret;
    int res = -1;

    xmlSecAssert2(buf != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    content = xmlNodeGetContent(node);
    if((content == NULL) || (xmlSecIsEmptyString(content) == 1)) {
        if((keyInfoCtx->flags & XMLSEC_KEYINFO_FLAGS_STOP_ON_EMPTY_NODE) != 0) {
            xmlSecInvalidNodeContentError(node, NULL, "empty");
            goto done;
        }

        /* success */
        res = 0;
        goto done;
    }

    /* usual trick with base64 decoding "in-place" */
    decodedSize = 0;
    ret = xmlSecBase64DecodeInPlace(content, &decodedSize);
    if(ret < 0) {
        xmlSecInternalError2("xmlSecBase64DecodeInPlace", NULL,
            "node=%s", xmlSecErrorsSafeString(xmlSecNodeGetName(node)));
        goto done;
    }

    ret = xmlSecBufferSetData(buf, (xmlSecByte*)content, decodedSize);
    if(ret < 0) {
        xmlSecInternalError3("xmlSecBufferSetData", NULL,
            "node=%s; size=" XMLSEC_SIZE_FMT,
            xmlSecErrorsSafeString(xmlSecNodeGetName(node)),
            decodedSize);
        goto done;
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(content != NULL) {
        xmlFree(content);
    }
    return(res);
}

static void
xmlSecKeyValueX509Trim(xmlChar * str) {
    xmlChar * p, * q;
    int len;

    xmlSecAssert(str != NULL);

    len = xmlStrlen(str);
    if(len <= 0) {
        return;
    }

    /* skip spaces from the beggining */
    p = str;
    q = str + len - 1;
    while(isspace(*p) && (p != q)) {
        ++p;
    }
    while(isspace(*q) && (p != q)) {
        --q;
    }

    /* all the cases */
    if((p == q) && isspace(*p)) {
        (*str) = '\0';
        return;
    } else if(p == str) {
        *(q + 1) = '\0';
    } else {
        xmlSecAssert(q >= p);

        len = (int)(q - p + 1);
        memmove(str, p, (size_t)len);
        str[len] = '\0';
    }
}

static int
xmlSecKeyValueX509XmlReadString(xmlChar **str, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlChar *content;
    int res = -1;

    xmlSecAssert2(str != NULL, -1);
    xmlSecAssert2((*str) == NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    content = xmlNodeGetContent(node);
    if(content != NULL) {
        xmlSecKeyValueX509Trim(content);
    }
    if((content == NULL) || (xmlStrlen(content) <= 0)) {
        if((keyInfoCtx->flags & XMLSEC_KEYINFO_FLAGS_STOP_ON_EMPTY_NODE) != 0) {
            xmlSecInvalidNodeContentError(node, NULL, "empty");
            goto done;
        }

        /* success */
        res = 0;
        goto done;
    }

    /* success */
    (*str) = content;
    content = NULL;
    res = 0;

done:
    /* cleanup */
    if(content != NULL) {
        xmlFree(content);
    }
    return(res);
}

static int
xmlSecKeyValueX509XmlReadIssuerSerial(xmlSecKeyValueX509Ptr x509Value, xmlNodePtr node,
                                      xmlSecKeyInfoCtxPtr keyInfoCtx) {
    xmlNodePtr cur;

    xmlSecAssert2(x509Value != NULL, -1);
    xmlSecAssert2(x509Value->issuerName == NULL, -1);
    xmlSecAssert2(x509Value->issuerSerial == NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    cur = xmlSecGetNextElementNode(node->children);
    if(cur == NULL) {
        if((keyInfoCtx->flags & XMLSEC_KEYINFO_FLAGS_STOP_ON_EMPTY_NODE) != 0) {
            xmlSecNodeNotFoundError("xmlSecGetNextElementNode", node, NULL, NULL);
            return(-1);
        }
        return(0);
    }

    /* the first is required node X509IssuerName */
    if(!xmlSecCheckNodeName(cur, xmlSecNodeX509IssuerName, xmlSecDSigNs)) {
        xmlSecInvalidNodeError(cur, xmlSecNodeX509IssuerName, NULL);
        return(-1);
    }
    x509Value->issuerName = xmlNodeGetContent(cur);
    if((x509Value->issuerName == NULL) || (xmlSecIsEmptyString(x509Value->issuerName) == 1)) {
        xmlSecInvalidNodeContentError(cur, NULL, "empty");
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* next is required node X509SerialNumber */
    if((cur == NULL) || !xmlSecCheckNodeName(cur, xmlSecNodeX509SerialNumber, xmlSecDSigNs)) {
        xmlSecInvalidNodeError(cur, xmlSecNodeX509SerialNumber, NULL);
        return(-1);
    }
    x509Value->issuerSerial  = xmlNodeGetContent(cur);
    if((x509Value->issuerSerial == NULL) || (xmlSecIsEmptyString(x509Value->issuerSerial) == 1)) {
        xmlSecInvalidNodeContentError(cur, NULL, "empty");
        return(-1);
    }
    cur = xmlSecGetNextElementNode(cur->next);

    /* nothing else is expected */
    if(cur != NULL) {
        xmlSecUnexpectedNodeError(cur, NULL);
        return(-1);
    }

    /* success */
    return(0);
}

static int
xmlSecKeyValueX509XmlRead(xmlSecKeyValueX509Ptr x509Value, xmlNodePtr node, xmlSecKeyInfoCtxPtr keyInfoCtx) {
    int ret;

    xmlSecAssert2(x509Value != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(keyInfoCtx != NULL, -1);

    if(xmlSecCheckNodeName(node, xmlSecNodeX509Certificate, xmlSecDSigNs)) {
        ret = xmlSecKeyValueX509XmlReadBase64Blob(&(x509Value->cert), node, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlReadBase64Blob(cert)", NULL);
            return(-1);
        }
    } else if(xmlSecCheckNodeName(node, xmlSecNodeX509CRL, xmlSecDSigNs)) {
        ret = xmlSecKeyValueX509XmlReadBase64Blob(&(x509Value->crl), node, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlReadBase64Blob(crl)", NULL);
            return(-1);
        }
    } else if(xmlSecCheckNodeName(node, xmlSecNodeX509SKI, xmlSecDSigNs)) {
        ret = xmlSecKeyValueX509XmlReadBase64Blob(&(x509Value->ski), node, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlReadBase64Blob(ski)", NULL);
            return(-1);
        }
    } else if(xmlSecCheckNodeName(node, xmlSecNodeX509SubjectName, xmlSecDSigNs)) {
        ret = xmlSecKeyValueX509XmlReadString(&(x509Value->subject), node, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlReadString(subject)", NULL);
            return(-1);
        }
    } else if(xmlSecCheckNodeName(node, xmlSecNodeX509IssuerSerial, xmlSecDSigNs)) {
        ret = xmlSecKeyValueX509XmlReadIssuerSerial(x509Value, node, keyInfoCtx);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlReadIssuerSerial", NULL);
            return(-1);
        }
    } else if((keyInfoCtx->flags & XMLSEC_KEYINFO_FLAGS_X509DATA_STOP_ON_UNKNOWN_CHILD) != 0) {
        /* laxi schema validation: ignore unknown nodes */
        xmlSecUnexpectedNodeError(node, NULL);
        return(-1);
    }

    /* done */
    return(0);
}

static int
xmlSecKeyValueX509XmlWriteBase64Blob(xmlSecBufferPtr buf, xmlNodePtr node,
                                    const xmlChar* nodeName, const xmlChar* nodeNs,
                                    int base64LineSize, int addLineBreaks) {
    xmlNodePtr cur;
    xmlChar *content;
    int res = -1;

    xmlSecAssert2(buf != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(nodeName != NULL, -1);

    content = xmlSecBase64Encode(xmlSecBufferGetData(buf), xmlSecBufferGetSize(buf),
        base64LineSize);
    if(content == NULL) {
        xmlSecInternalError("xmlSecBase64Encode", NULL);
        goto done;
    }

    cur = xmlSecEnsureEmptyChild(node, nodeName, nodeNs);
    if(cur == NULL) {
        xmlSecInternalError2("xmlSecEnsureEmptyChild()", NULL,
            "nodeName=%s", xmlSecErrorsSafeString(nodeName));
        goto done;
    }

    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    xmlNodeSetContent(cur, content);

    if(addLineBreaks) {
        xmlNodeAddContent(cur, xmlSecGetDefaultLineFeed());
    }

    /* success */
    res = 0;

done:
    /* cleanup */
    if(content != NULL) {
        xmlFree(content);
    }
    return(res);
}


static int
xmlSecKeyValueX509XmlWriteString(const xmlChar* content, xmlNodePtr node,
                                 const xmlChar* nodeName, const xmlChar* nodeNs) {
    xmlNodePtr cur;

    xmlSecAssert2(content != NULL, -1);
    xmlSecAssert2(node != NULL, -1);
    xmlSecAssert2(nodeName != NULL, -1);

    cur = xmlSecEnsureEmptyChild(node, nodeName, nodeNs);
    if(cur == NULL) {
        xmlSecInternalError2("xmlSecEnsureEmptyChild()", NULL,
            "nodeName=%s", xmlSecErrorsSafeString(nodeName));
        return(-1);
    }

    xmlNodeSetContent(cur, content);

    /* success */
    return(0);
}

static int
xmlSecKeyValueX509XmlWrite(xmlSecKeyValueX509Ptr x509Value, xmlNodePtr node,
                           int base64LineSize, int addLineBreaks) {
    int ret;

    xmlSecAssert2(x509Value != NULL, -1);
    xmlSecAssert2(node != NULL, -1);

    if(xmlSecBufferGetSize(&(x509Value->cert)) > 0) {
        ret = xmlSecKeyValueX509XmlWriteBase64Blob(&(x509Value->cert), node,
            xmlSecNodeX509Certificate, xmlSecDSigNs,
            base64LineSize, addLineBreaks);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlWriteBase64Blob(cert)", NULL);
            return(-1);
        }
    }
    if(xmlSecBufferGetSize(&(x509Value->crl)) > 0) {
        ret = xmlSecKeyValueX509XmlWriteBase64Blob(&(x509Value->crl), node,
            xmlSecNodeX509CRL, xmlSecDSigNs,
            base64LineSize, addLineBreaks);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlWriteBase64Blob(cert)", NULL);
            return(-1);
        }
    }
    if(xmlSecBufferGetSize(&(x509Value->ski)) > 0) {
        ret = xmlSecKeyValueX509XmlWriteBase64Blob(&(x509Value->ski), node,
            xmlSecNodeX509SKI, xmlSecDSigNs,
            base64LineSize, addLineBreaks);
        if(ret < 0) {
            xmlSecInternalError("xmlSecKeyValueX509XmlWriteBase64Blob(ski)", NULL);
            return(-1);
        }
    }
    if(x509Value->subject != NULL) {
        ret = xmlSecKeyValueX509XmlWriteString(x509Value->subject, node,
            xmlSecNodeX509SubjectName, xmlSecDSigNs);
        if(ret < 0) {
            xmlSecInternalError2("xmlSecKeyValueX509XmlWriteString", NULL,
                "subject=%s", xmlSecErrorsSafeString(x509Value->subject));
            return(-1);
        }
    }
    if((x509Value->issuerName != NULL) && (x509Value->issuerSerial != NULL)) {
        xmlNodePtr issuerSerial;

        issuerSerial = xmlSecEnsureEmptyChild(node, xmlSecNodeX509IssuerSerial, xmlSecDSigNs);
        if(issuerSerial == NULL) {
            xmlSecInternalError("xmlSecEnsureEmptyChild(xmlSecNodeX509IssuerSerial)", NULL);
            return(-1);
        }
        ret = xmlSecKeyValueX509XmlWriteString(x509Value->issuerName, issuerSerial,
            xmlSecNodeX509IssuerName, xmlSecDSigNs);
        if(ret < 0) {
            xmlSecInternalError2("xmlSecKeyValueX509XmlWriteString", NULL,
                "issuerName=%s", xmlSecErrorsSafeString(x509Value->issuerName));
            return(-1);
        }

        ret = xmlSecKeyValueX509XmlWriteString(x509Value->issuerSerial, issuerSerial,
            xmlSecNodeX509SerialNumber, xmlSecDSigNs);
        if(ret < 0) {
            xmlSecInternalError2("xmlSecKeyValueX509XmlWriteString", NULL,
                "issuerSerial=%s", xmlSecErrorsSafeString(x509Value->issuerSerial));
            return(-1);
        }
    }
    return(0);
}


#endif /* !defined(XMLSEC_NO_X509) */

/***********************************************************************
 *
 * Keys Data list
 *
 **********************************************************************/
static xmlSecPtrListKlass xmlSecKeyDataListKlass = {
    BAD_CAST "key-data-list",
    (xmlSecPtrDuplicateItemMethod)xmlSecKeyDataDuplicate,       /* xmlSecPtrDuplicateItemMethod duplicateItem; */
    (xmlSecPtrDestroyItemMethod)xmlSecKeyDataDestroy,           /* xmlSecPtrDestroyItemMethod destroyItem; */
    (xmlSecPtrDebugDumpItemMethod)xmlSecKeyDataDebugDump,       /* xmlSecPtrDebugDumpItemMethod debugDumpItem; */
    (xmlSecPtrDebugDumpItemMethod)xmlSecKeyDataDebugXmlDump,    /* xmlSecPtrDebugDumpItemMethod debugXmlDumpItem; */
};

/**
 * xmlSecKeyDataListGetKlass:
 *
 * The key data list klass.
 *
 * Returns: pointer to the key data list klass.
 */
xmlSecPtrListId
xmlSecKeyDataListGetKlass(void) {
    return(&xmlSecKeyDataListKlass);
}


/***********************************************************************
 *
 * Keys Data Ids list
 *
 **********************************************************************/
static xmlSecPtrListKlass xmlSecKeyDataIdListKlass = {
    BAD_CAST "key-data-ids-list",
    NULL,                                                       /* xmlSecPtrDuplicateItemMethod duplicateItem; */
    NULL,                                                       /* xmlSecPtrDestroyItemMethod destroyItem; */
    NULL,                                                       /* xmlSecPtrDebugDumpItemMethod debugDumpItem; */
    NULL,                                                       /* xmlSecPtrDebugDumpItemMethod debugXmlDumpItem; */
};

/**
 * xmlSecKeyDataIdListGetKlass:
 *
 * The key data id list klass.
 *
 * Returns: pointer to the key data id list klass.
 */
xmlSecPtrListId
xmlSecKeyDataIdListGetKlass(void) {
    return(&xmlSecKeyDataIdListKlass);
}

/**
 * xmlSecKeyDataIdListFind:
 * @list:               the pointer to key data ids list.
 * @dataId:             the key data klass.
 *
 * Lookups @dataId in @list.
 *
 * Returns: 1 if @dataId is found in the @list, 0 if not and a negative
 * value if an error occurs.
 */
int
xmlSecKeyDataIdListFind(xmlSecPtrListPtr list, xmlSecKeyDataId dataId) {
    xmlSecSize i, size;

    xmlSecAssert2(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId), 0);
    xmlSecAssert2(dataId != NULL, 0);

    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        if((xmlSecKeyDataId)xmlSecPtrListGetItem(list, i) == dataId) {
            return(1);
        }
    }
    return(0);
}

/**
 * xmlSecKeyDataIdListFindByNode:
 * @list:               the pointer to key data ids list.
 * @nodeName:           the desired key data klass XML node name.
 * @nodeNs:             the desired key data klass XML node namespace.
 * @usage:              the desired key data usage.
 *
 * Lookups data klass in the list with given @nodeName, @nodeNs and
 * @usage in the @list.
 *
 * Returns: key data klass is found and NULL otherwise.
 */
xmlSecKeyDataId
xmlSecKeyDataIdListFindByNode(xmlSecPtrListPtr list, const xmlChar* nodeName,
                            const xmlChar* nodeNs, xmlSecKeyDataUsage usage) {
    xmlSecKeyDataId dataId;
    xmlSecSize i, size;

    xmlSecAssert2(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId), xmlSecKeyDataIdUnknown);
    xmlSecAssert2(nodeName != NULL, xmlSecKeyDataIdUnknown);

    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        dataId = (xmlSecKeyDataId)xmlSecPtrListGetItem(list, i);
        xmlSecAssert2(dataId != xmlSecKeyDataIdUnknown, xmlSecKeyDataIdUnknown);

        if(((usage & dataId->usage) != 0) &&
           xmlStrEqual(nodeName, dataId->dataNodeName) &&
           xmlStrEqual(nodeNs, dataId->dataNodeNs)) {

           return(dataId);
        }
    }
    return(xmlSecKeyDataIdUnknown);
}

/**
 * xmlSecKeyDataIdListFindByHref:
 * @list:               the pointer to key data ids list.
 * @href:               the desired key data klass href.
 * @usage:              the desired key data usage.
 *
 * Lookups data klass in the list with given @href and @usage in @list.
 *
 * Returns: key data klass is found and NULL otherwise.
 */
xmlSecKeyDataId
xmlSecKeyDataIdListFindByHref(xmlSecPtrListPtr list, const xmlChar* href,
                            xmlSecKeyDataUsage usage) {
    xmlSecKeyDataId dataId;
    xmlSecSize i, size;

    xmlSecAssert2(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId), xmlSecKeyDataIdUnknown);
    xmlSecAssert2(href != NULL, xmlSecKeyDataIdUnknown);

    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        dataId = (xmlSecKeyDataId)xmlSecPtrListGetItem(list, i);
        xmlSecAssert2(dataId != xmlSecKeyDataIdUnknown, xmlSecKeyDataIdUnknown);

        if(((usage & dataId->usage) != 0) && (dataId->href != NULL) &&
           xmlStrEqual(href, dataId->href)) {

           return(dataId);
        }
    }
    return(xmlSecKeyDataIdUnknown);
}

/**
 * xmlSecKeyDataIdListFindByName:
 * @list:               the pointer to key data ids list.
 * @name:               the desired key data klass name.
 * @usage:              the desired key data usage.
 *
 * Lookups data klass in the list with given @name and @usage in @list.
 *
 * Returns: key data klass is found and NULL otherwise.
 */
xmlSecKeyDataId
xmlSecKeyDataIdListFindByName(xmlSecPtrListPtr list, const xmlChar* name,
                            xmlSecKeyDataUsage usage) {
    xmlSecKeyDataId dataId;
    xmlSecSize i, size;

    xmlSecAssert2(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId), xmlSecKeyDataIdUnknown);
    xmlSecAssert2(name != NULL, xmlSecKeyDataIdUnknown);

    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        dataId = (xmlSecKeyDataId)xmlSecPtrListGetItem(list, i);
        xmlSecAssert2(dataId != xmlSecKeyDataIdUnknown, xmlSecKeyDataIdUnknown);

        if(((usage & dataId->usage) != 0) && (dataId->name != NULL) &&
           xmlStrEqual(name, BAD_CAST dataId->name)) {

           return(dataId);
        }
    }
    return(xmlSecKeyDataIdUnknown);
}

/**
 * xmlSecKeyDataIdListDebugDump:
 * @list:               the pointer to key data ids list.
 * @output:             the pointer to output FILE.
 *
 * Prints binary key data debug information to @output.
 */
void
xmlSecKeyDataIdListDebugDump(xmlSecPtrListPtr list, FILE* output) {
    xmlSecKeyDataId dataId;
    xmlSecSize i, size;

    xmlSecAssert(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId));
    xmlSecAssert(output != NULL);

    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        dataId = (xmlSecKeyDataId)xmlSecPtrListGetItem(list, i);
        xmlSecAssert(dataId != NULL);
        xmlSecAssert(dataId->name != NULL);

        if(i > 0) {
            fprintf(output, ",\"%s\"", dataId->name);
        } else {
            fprintf(output, "\"%s\"", dataId->name);
        }
    }
    fprintf(output, "\n");
}

/**
 * xmlSecKeyDataIdListDebugXmlDump:
 * @list:               the pointer to key data ids list.
 * @output:             the pointer to output FILE.
 *
 * Prints binary key data debug information to @output in XML format.
 */
void
xmlSecKeyDataIdListDebugXmlDump(xmlSecPtrListPtr list, FILE* output) {
    xmlSecKeyDataId dataId;
    xmlSecSize i, size;

    xmlSecAssert(xmlSecPtrListCheckId(list, xmlSecKeyDataIdListId));
    xmlSecAssert(output != NULL);

    fprintf(output, "<KeyDataIdsList>\n");
    size = xmlSecPtrListGetSize(list);
    for(i = 0; i < size; ++i) {
        dataId = (xmlSecKeyDataId)xmlSecPtrListGetItem(list, i);
        xmlSecAssert(dataId != NULL);
        xmlSecAssert(dataId->name != NULL);

        fprintf(output, "<DataId name=\"");
        xmlSecPrintXmlString(output, dataId->name);
        fprintf(output, "\"/>");
    }
    fprintf(output, "</KeyDataIdsList>\n");
}

/**************************************************************************
 *
 * xmlSecKeyDataStore functions
 *
 *************************************************************************/
/**
 * xmlSecKeyDataStoreCreate:
 * @id:                 the store id.
 *
 * Creates new key data store of the specified klass @id. Caller is responsible
 * for freeing returned object with #xmlSecKeyDataStoreDestroy function.
 *
 * Returns: the pointer to newly allocated key data store structure
 * or NULL if an error occurs.
 */
xmlSecKeyDataStorePtr
xmlSecKeyDataStoreCreate(xmlSecKeyDataStoreId id)  {
    xmlSecKeyDataStorePtr store;
    int ret;

    xmlSecAssert2(id != NULL, NULL);
    xmlSecAssert2(id->objSize > 0, NULL);

    /* Allocate a new xmlSecKeyDataStore and fill the fields. */
    store = (xmlSecKeyDataStorePtr)xmlMalloc(id->objSize);
    if(store == NULL) {
        xmlSecMallocError(id->objSize,
                          xmlSecKeyDataStoreKlassGetName(id));
        return(NULL);
    }
    memset(store, 0, id->objSize);
    store->id = id;

    if(id->initialize != NULL) {
        ret = (id->initialize)(store);
        if(ret < 0) {
            xmlSecInternalError("id->initialize",
                                xmlSecKeyDataStoreKlassGetName(id));
            xmlSecKeyDataStoreDestroy(store);
            return(NULL);
        }
    }

    return(store);
}

/**
 * xmlSecKeyDataStoreDestroy:
 * @store:              the pointer to the key data store..
 *
 * Destroys the key data store created with #xmlSecKeyDataStoreCreate
 * function.
 */
void
xmlSecKeyDataStoreDestroy(xmlSecKeyDataStorePtr store) {
    xmlSecAssert(xmlSecKeyDataStoreIsValid(store));
    xmlSecAssert(store->id->objSize > 0);

    if(store->id->finalize != NULL) {
        (store->id->finalize)(store);
    }
    memset(store, 0, store->id->objSize);
    xmlFree(store);
}

/***********************************************************************
 *
 * Keys Data Store list
 *
 **********************************************************************/
static xmlSecPtrListKlass xmlSecKeyDataStorePtrListKlass = {
    BAD_CAST "keys-data-store-list",
    NULL,                                                       /* xmlSecPtrDuplicateItemMethod duplicateItem; */
    (xmlSecPtrDestroyItemMethod)xmlSecKeyDataStoreDestroy,      /* xmlSecPtrDestroyItemMethod destroyItem; */
    NULL,                                                       /* xmlSecPtrDebugDumpItemMethod debugDumpItem; */
    NULL,                                                       /* xmlSecPtrDebugDumpItemMethod debugXmlDumpItem; */
};

/**
 * xmlSecKeyDataStorePtrListGetKlass:
 *
 * Key data stores list.
 *
 * Returns: key data stores list klass.
 */
xmlSecPtrListId
xmlSecKeyDataStorePtrListGetKlass(void) {
    return(&xmlSecKeyDataStorePtrListKlass);
}

/**
 * xmlSecImportSetPersistKey:
 *
 * Sets global flag to import keys to persistent storage (MSCrypto and MSCNG).
 * Also see PKCS12_NO_PERSIST_KEY.
 *
 */
void xmlSecImportSetPersistKey(void) {
    xmlSecImportPersistKey = 1;
}

/**
 * xmlSecImportGetPersistKey:
 *
 * Gets global flag to import keys to persistent storage (MSCrypto and MSCNG).
 * Also see PKCS12_NO_PERSIST_KEY.
 *
 * Returns: 1 if keys should be imported into persistent storage and 0 otherwise.
 */
int xmlSecImportGetPersistKey(void) {
    return xmlSecImportPersistKey;
}
