=pod

=head1 NAME

DECLARE_ASN1_FUNCTIONS,
IMPLEMENT_ASN1_FUNCTIONS,
ASN1_ITEM,
ACCESS_DESCRIPTION_free,
ACCESS_DESCRIPTION_new,
ADMISSIONS_free,
ADMISSIONS_new,
ADMISSION_SYNTAX_free,
ADMISSION_SYNTAX_new,
ASIdOrRange_free,
ASIdOrRange_new,
ASIdentifierChoice_free,
ASIdentifierChoice_new,
ASIdentifiers_free,
ASIdentifiers_new,
ASRange_free,
ASRange_new,
AUTHORITY_INFO_ACCESS_free,
AUTHORITY_INFO_ACCESS_new,
AUTHORITY_KEYID_free,
AUTHORITY_KEYID_new,
BASIC_CONSTRAINTS_free,
BASIC_CONSTRAINTS_new,
CERTIFICATEPOLICIES_free,
CERTIFICATEPOLICIES_new,
CMS_ContentInfo_free,
CMS_ContentInfo_new,
CMS_ContentInfo_new_ex,
CMS_ContentInfo_print_ctx,
CMS_ReceiptRequest_free,
CMS_ReceiptRequest_new,
CRL_DIST_POINTS_free,
CRL_DIST_POINTS_new,
DIRECTORYSTRING_free,
DIRECTORYSTRING_new,
DISPLAYTEXT_free,
DISPLAYTEXT_new,
DIST_POINT_NAME_free,
DIST_POINT_NAME_new,
DIST_POINT_free,
DIST_POINT_new,
DSAparams_dup,
ECPARAMETERS_free,
ECPARAMETERS_new,
ECPKPARAMETERS_free,
ECPKPARAMETERS_new,
EDIPARTYNAME_free,
EDIPARTYNAME_new,
ESS_CERT_ID_dup,
ESS_CERT_ID_free,
ESS_CERT_ID_new,
ESS_CERT_ID_V2_dup,
ESS_CERT_ID_V2_free,
ESS_CERT_ID_V2_new,
ESS_ISSUER_SERIAL_dup,
ESS_ISSUER_SERIAL_free,
ESS_ISSUER_SERIAL_new,
ESS_SIGNING_CERT_dup,
ESS_SIGNING_CERT_free,
ESS_SIGNING_CERT_it,
ESS_SIGNING_CERT_new,
ESS_SIGNING_CERT_V2_dup,
ESS_SIGNING_CERT_V2_free,
ESS_SIGNING_CERT_V2_it,
ESS_SIGNING_CERT_V2_new,
EXTENDED_KEY_USAGE_free,
EXTENDED_KEY_USAGE_new,
GENERAL_NAMES_free,
GENERAL_NAMES_new,
GENERAL_NAME_dup,
GENERAL_NAME_free,
GENERAL_NAME_new,
GENERAL_SUBTREE_free,
GENERAL_SUBTREE_new,
IPAddressChoice_free,
IPAddressChoice_new,
IPAddressFamily_free,
IPAddressFamily_new,
IPAddressOrRange_free,
IPAddressOrRange_new,
IPAddressRange_free,
IPAddressRange_new,
ISSUER_SIGN_TOOL_free,
ISSUER_SIGN_TOOL_it,
ISSUER_SIGN_TOOL_new,
ISSUING_DIST_POINT_free,
ISSUING_DIST_POINT_it,
ISSUING_DIST_POINT_new,
NAME_CONSTRAINTS_free,
NAME_CONSTRAINTS_new,
NAMING_AUTHORITY_free,
NAMING_AUTHORITY_new,
NETSCAPE_CERT_SEQUENCE_free,
NETSCAPE_CERT_SEQUENCE_new,
NETSCAPE_SPKAC_free,
NETSCAPE_SPKAC_new,
NETSCAPE_SPKI_free,
NETSCAPE_SPKI_new,
NOTICEREF_free,
NOTICEREF_new,
OCSP_BASICRESP_free,
OCSP_BASICRESP_new,
OCSP_CERTID_dup,
OCSP_CERTID_new,
OCSP_CERTSTATUS_free,
OCSP_CERTSTATUS_new,
OCSP_CRLID_free,
OCSP_CRLID_new,
OCSP_ONEREQ_free,
OCSP_ONEREQ_new,
OCSP_REQINFO_free,
OCSP_REQINFO_new,
OCSP_RESPBYTES_free,
OCSP_RESPBYTES_new,
OCSP_RESPDATA_free,
OCSP_RESPDATA_new,
OCSP_RESPID_free,
OCSP_RESPID_new,
OCSP_RESPONSE_new,
OCSP_REVOKEDINFO_free,
OCSP_REVOKEDINFO_new,
OCSP_SERVICELOC_free,
OCSP_SERVICELOC_new,
OCSP_SIGNATURE_free,
OCSP_SIGNATURE_new,
OCSP_SINGLERESP_free,
OCSP_SINGLERESP_new,
OSSL_CMP_ITAV_dup,
OSSL_CMP_ITAV_free,
OSSL_CMP_MSG_dup,
OSSL_CMP_MSG_it,
OSSL_CMP_MSG_free,
OSSL_CMP_PKIHEADER_free,
OSSL_CMP_PKIHEADER_it,
OSSL_CMP_PKIHEADER_new,
OSSL_CMP_PKISI_dup,
OSSL_CMP_PKISI_free,
OSSL_CMP_PKISI_it,
OSSL_CMP_PKISI_new,
OSSL_CMP_PKISTATUS_it,
OSSL_CRMF_CERTID_dup,
OSSL_CRMF_CERTID_free,
OSSL_CRMF_CERTID_it,
OSSL_CRMF_CERTID_new,
OSSL_CRMF_CERTTEMPLATE_free,
OSSL_CRMF_CERTTEMPLATE_it,
OSSL_CRMF_CERTTEMPLATE_new,
OSSL_CRMF_ENCRYPTEDVALUE_free,
OSSL_CRMF_ENCRYPTEDVALUE_it,
OSSL_CRMF_ENCRYPTEDVALUE_new,
OSSL_CRMF_MSGS_free,
OSSL_CRMF_MSGS_it,
OSSL_CRMF_MSGS_new,
OSSL_CRMF_MSG_dup,
OSSL_CRMF_MSG_free,
OSSL_CRMF_MSG_it,
OSSL_CRMF_MSG_new,
OSSL_CRMF_PBMPARAMETER_free,
OSSL_CRMF_PBMPARAMETER_it,
OSSL_CRMF_PBMPARAMETER_new,
OSSL_CRMF_PKIPUBLICATIONINFO_free,
OSSL_CRMF_PKIPUBLICATIONINFO_it,
OSSL_CRMF_PKIPUBLICATIONINFO_new,
OSSL_CRMF_SINGLEPUBINFO_free,
OSSL_CRMF_SINGLEPUBINFO_it,
OSSL_CRMF_SINGLEPUBINFO_new,
OTHERNAME_free,
OTHERNAME_new,
PBE2PARAM_free,
PBE2PARAM_new,
PBEPARAM_free,
PBEPARAM_new,
PBKDF2PARAM_free,
PBKDF2PARAM_new,
PKCS12_BAGS_free,
PKCS12_BAGS_new,
PKCS12_MAC_DATA_free,
PKCS12_MAC_DATA_new,
PKCS12_SAFEBAG_free,
PKCS12_SAFEBAG_new,
PKCS12_free,
PKCS12_new,
PKCS7_DIGEST_free,
PKCS7_DIGEST_new,
PKCS7_ENCRYPT_free,
PKCS7_ENCRYPT_new,
PKCS7_ENC_CONTENT_free,
PKCS7_ENC_CONTENT_new,
PKCS7_ENVELOPE_free,
PKCS7_ENVELOPE_new,
PKCS7_ISSUER_AND_SERIAL_free,
PKCS7_ISSUER_AND_SERIAL_new,
PKCS7_RECIP_INFO_free,
PKCS7_RECIP_INFO_new,
PKCS7_SIGNED_free,
PKCS7_SIGNED_new,
PKCS7_SIGNER_INFO_free,
PKCS7_SIGNER_INFO_new,
PKCS7_SIGN_ENVELOPE_free,
PKCS7_SIGN_ENVELOPE_new,
PKCS7_dup,
PKCS7_free,
PKCS7_new_ex,
PKCS7_new,
PKCS7_print_ctx,
PKCS8_PRIV_KEY_INFO_free,
PKCS8_PRIV_KEY_INFO_new,
PKEY_USAGE_PERIOD_free,
PKEY_USAGE_PERIOD_new,
POLICYINFO_free,
POLICYINFO_new,
POLICYQUALINFO_free,
POLICYQUALINFO_new,
POLICY_CONSTRAINTS_free,
POLICY_CONSTRAINTS_new,
POLICY_MAPPING_free,
POLICY_MAPPING_new,
PROFESSION_INFOS_free,
PROFESSION_INFOS_new,
PROFESSION_INFO_free,
PROFESSION_INFO_new,
PROXY_CERT_INFO_EXTENSION_free,
PROXY_CERT_INFO_EXTENSION_new,
PROXY_POLICY_free,
PROXY_POLICY_new,
RSAPrivateKey_dup,
RSAPublicKey_dup,
RSA_OAEP_PARAMS_free,
RSA_OAEP_PARAMS_new,
RSA_PSS_PARAMS_free,
RSA_PSS_PARAMS_new,
RSA_PSS_PARAMS_dup,
SCRYPT_PARAMS_free,
SCRYPT_PARAMS_new,
SXNETID_free,
SXNETID_new,
SXNET_free,
SXNET_new,
TLS_FEATURE_free,
TLS_FEATURE_new,
TS_ACCURACY_dup,
TS_ACCURACY_free,
TS_ACCURACY_new,
TS_MSG_IMPRINT_dup,
TS_MSG_IMPRINT_free,
TS_MSG_IMPRINT_new,
TS_REQ_dup,
TS_REQ_free,
TS_REQ_new,
TS_RESP_dup,
TS_RESP_free,
TS_RESP_new,
TS_STATUS_INFO_dup,
TS_STATUS_INFO_free,
TS_STATUS_INFO_new,
TS_TST_INFO_dup,
TS_TST_INFO_free,
TS_TST_INFO_new,
USERNOTICE_free,
USERNOTICE_new,
X509_ALGOR_free,
X509_ALGOR_it,
X509_ALGOR_new,
X509_ATTRIBUTE_dup,
X509_ATTRIBUTE_free,
X509_ATTRIBUTE_new,
X509_CERT_AUX_free,
X509_CERT_AUX_new,
X509_CINF_free,
X509_CINF_new,
X509_CRL_INFO_free,
X509_CRL_INFO_new,
X509_CRL_dup,
X509_CRL_free,
X509_CRL_new_ex,
X509_CRL_new,
X509_EXTENSION_dup,
X509_EXTENSION_free,
X509_EXTENSION_new,
X509_NAME_ENTRY_dup,
X509_NAME_ENTRY_free,
X509_NAME_ENTRY_new,
X509_NAME_dup,
X509_NAME_free,
X509_NAME_new,
X509_REQ_INFO_free,
X509_REQ_INFO_new,
X509_REQ_dup,
X509_REQ_free,
X509_REQ_new,
X509_REQ_new_ex,
X509_REVOKED_dup,
X509_REVOKED_free,
X509_REVOKED_new,
X509_SIG_free,
X509_SIG_new,
X509_VAL_free,
X509_VAL_new,
X509_dup,
- ASN1 object utilities

=head1 SYNOPSIS

=for openssl generic

 #include <openssl/asn1t.h>

 DECLARE_ASN1_FUNCTIONS(type)
 IMPLEMENT_ASN1_FUNCTIONS(stname)

 typedef struct ASN1_ITEM_st ASN1_ITEM;

 extern const ASN1_ITEM TYPE_it;
 TYPE *TYPE_new(void);
 TYPE *TYPE_dup(const TYPE *a);
 void TYPE_free(TYPE *a);
 int TYPE_print_ctx(BIO *out, TYPE *a, int indent, const ASN1_PCTX *pctx);

The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
see L<openssl_user_macros(7)>:

 DSA *DSAparams_dup(const DSA *dsa);
 RSA *RSAPrivateKey_dup(const RSA *rsa);
 RSA *RSAPublicKey_dup(const RSA *rsa);

=head1 DESCRIPTION

In the description below, B<I<TYPE>> is used
as a placeholder for any of the OpenSSL datatypes, such as B<X509>.

The OpenSSL ASN1 parsing library templates are like a data-driven bytecode
interpreter.
Every ASN1 object as a global variable, TYPE_it, that describes the item
such as its fields.  (On systems which cannot export variables from shared
libraries, the global is instead a function which returns a pointer to a
static variable.

The macro DECLARE_ASN1_FUNCTIONS() is typically used in header files
to generate the function declarations.

The macro IMPLEMENT_ASN1_FUNCTIONS() is used once in a source file
to generate the function bodies.


B<I<TYPE>_new>() allocates an empty object of the indicated type.
The object returned must be released by calling B<I<TYPE>_free>().

B<I<TYPE>_new_ex>() is similar to B<I<TYPE>_new>() but also passes the
library context I<libctx> and the property query I<propq> to use when retrieving
algorithms from providers. This created object can then be used when loading
binary data using B<d2i_I<TYPE>>().

B<I<TYPE>_dup>() copies an existing object, leaving it untouched.
Note, however, that the internal representation of the object
may contain (besides the ASN.1 structure) further data, which is not copied.
For instance, an B<X509> object usually is augmented by cached information
on X.509v3 extensions, etc., and losing it can lead to wrong validation results.
To avoid such situations, better use B<I<TYPE>_up_ref>() if available.
For the case of B<X509> objects, an alternative to using L<X509_up_ref(3)>
may be to still call B<I<TYPE>_dup>(), e.g., I<copied_cert = X509_dup(cert)>,
followed by I<X509_check_purpose(copied_cert, -1, 0)>,
which re-builds the cached data.

B<I<TYPE>_free>() releases the object and all pointers and sub-objects
within it.

B<I<TYPE>_print_ctx>() prints the object I<a> on the specified BIO I<out>.
Each line will be prefixed with I<indent> spaces.
The I<pctx> specifies the printing context and is for internal
use; use NULL to get the default behavior.  If a print function is
user-defined, then pass in any I<pctx> down to any nested calls.

=head1 RETURN VALUES

B<I<TYPE>_new>(), B<I<TYPE>_new_ex>() and B<I<TYPE>_dup>() return a pointer to
the object or NULL on failure.

B<I<TYPE>_print_ctx>() returns 1 on success or zero on failure.

=head1 SEE ALSO

L<X509_up_ref(3)>

=head1 HISTORY

The functions X509_REQ_new_ex(), X509_CRL_new_ex(), PKCS7_new_ex() and
CMS_ContentInfo_new_ex() were added in OpenSSL 3.0.

The functions DSAparams_dup(), RSAPrivateKey_dup() and RSAPublicKey_dup() were
deprecated in 3.0.

=head1 COPYRIGHT

Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut
