/*
 * internal.c
 *		Wrapper for builtin functions
 *
 * Copyright (c) 2001 Marko Kreen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * contrib/pgcrypto/internal-sha2.c
 */

#include "postgres.h"

#include <time.h>

#include "px.h"
#include "sha2.h"

void		init_sha224(PX_MD *h);
void		init_sha256(PX_MD *h);
void		init_sha384(PX_MD *h);
void		init_sha512(PX_MD *h);

/* SHA224 */

static unsigned
int_sha224_len(PX_MD *h)
{
	return SHA224_DIGEST_LENGTH;
}

static unsigned
int_sha224_block_len(PX_MD *h)
{
	return SHA224_BLOCK_LENGTH;
}

static void
int_sha224_update(PX_MD *h, const uint8 *data, unsigned dlen)
{
	SHA224_CTX *ctx = (SHA224_CTX *) h->p.ptr;

	SHA224_Update(ctx, data, dlen);
}

static void
int_sha224_reset(PX_MD *h)
{
	SHA224_CTX *ctx = (SHA224_CTX *) h->p.ptr;

	SHA224_Init(ctx);
}

static void
int_sha224_finish(PX_MD *h, uint8 *dst)
{
	SHA224_CTX *ctx = (SHA224_CTX *) h->p.ptr;

	SHA224_Final(dst, ctx);
}

static void
int_sha224_free(PX_MD *h)
{
	SHA224_CTX *ctx = (SHA224_CTX *) h->p.ptr;

	px_memset(ctx, 0, sizeof(*ctx));
	px_free(ctx);
	px_free(h);
}

/* SHA256 */

static unsigned
int_sha256_len(PX_MD *h)
{
	return SHA256_DIGEST_LENGTH;
}

static unsigned
int_sha256_block_len(PX_MD *h)
{
	return SHA256_BLOCK_LENGTH;
}

static void
int_sha256_update(PX_MD *h, const uint8 *data, unsigned dlen)
{
	SHA256_CTX *ctx = (SHA256_CTX *) h->p.ptr;

	SHA256_Update(ctx, data, dlen);
}

static void
int_sha256_reset(PX_MD *h)
{
	SHA256_CTX *ctx = (SHA256_CTX *) h->p.ptr;

	SHA256_Init(ctx);
}

static void
int_sha256_finish(PX_MD *h, uint8 *dst)
{
	SHA256_CTX *ctx = (SHA256_CTX *) h->p.ptr;

	SHA256_Final(dst, ctx);
}

static void
int_sha256_free(PX_MD *h)
{
	SHA256_CTX *ctx = (SHA256_CTX *) h->p.ptr;

	px_memset(ctx, 0, sizeof(*ctx));
	px_free(ctx);
	px_free(h);
}

/* SHA384 */

static unsigned
int_sha384_len(PX_MD *h)
{
	return SHA384_DIGEST_LENGTH;
}

static unsigned
int_sha384_block_len(PX_MD *h)
{
	return SHA384_BLOCK_LENGTH;
}

static void
int_sha384_update(PX_MD *h, const uint8 *data, unsigned dlen)
{
	SHA384_CTX *ctx = (SHA384_CTX *) h->p.ptr;

	SHA384_Update(ctx, data, dlen);
}

static void
int_sha384_reset(PX_MD *h)
{
	SHA384_CTX *ctx = (SHA384_CTX *) h->p.ptr;

	SHA384_Init(ctx);
}

static void
int_sha384_finish(PX_MD *h, uint8 *dst)
{
	SHA384_CTX *ctx = (SHA384_CTX *) h->p.ptr;

	SHA384_Final(dst, ctx);
}

static void
int_sha384_free(PX_MD *h)
{
	SHA384_CTX *ctx = (SHA384_CTX *) h->p.ptr;

	px_memset(ctx, 0, sizeof(*ctx));
	px_free(ctx);
	px_free(h);
}

/* SHA512 */

static unsigned
int_sha512_len(PX_MD *h)
{
	return SHA512_DIGEST_LENGTH;
}

static unsigned
int_sha512_block_len(PX_MD *h)
{
	return SHA512_BLOCK_LENGTH;
}

static void
int_sha512_update(PX_MD *h, const uint8 *data, unsigned dlen)
{
	SHA512_CTX *ctx = (SHA512_CTX *) h->p.ptr;

	SHA512_Update(ctx, data, dlen);
}

static void
int_sha512_reset(PX_MD *h)
{
	SHA512_CTX *ctx = (SHA512_CTX *) h->p.ptr;

	SHA512_Init(ctx);
}

static void
int_sha512_finish(PX_MD *h, uint8 *dst)
{
	SHA512_CTX *ctx = (SHA512_CTX *) h->p.ptr;

	SHA512_Final(dst, ctx);
}

static void
int_sha512_free(PX_MD *h)
{
	SHA512_CTX *ctx = (SHA512_CTX *) h->p.ptr;

	px_memset(ctx, 0, sizeof(*ctx));
	px_free(ctx);
	px_free(h);
}

/* init functions */

void
init_sha224(PX_MD *md)
{
	SHA224_CTX *ctx;

	ctx = px_alloc(sizeof(*ctx));
	memset(ctx, 0, sizeof(*ctx));

	md->p.ptr = ctx;

	md->result_size = int_sha224_len;
	md->block_size = int_sha224_block_len;
	md->reset = int_sha224_reset;
	md->update = int_sha224_update;
	md->finish = int_sha224_finish;
	md->free = int_sha224_free;

	md->reset(md);
}

void
init_sha256(PX_MD *md)
{
	SHA256_CTX *ctx;

	ctx = px_alloc(sizeof(*ctx));
	memset(ctx, 0, sizeof(*ctx));

	md->p.ptr = ctx;

	md->result_size = int_sha256_len;
	md->block_size = int_sha256_block_len;
	md->reset = int_sha256_reset;
	md->update = int_sha256_update;
	md->finish = int_sha256_finish;
	md->free = int_sha256_free;

	md->reset(md);
}

void
init_sha384(PX_MD *md)
{
	SHA384_CTX *ctx;

	ctx = px_alloc(sizeof(*ctx));
	memset(ctx, 0, sizeof(*ctx));

	md->p.ptr = ctx;

	md->result_size = int_sha384_len;
	md->block_size = int_sha384_block_len;
	md->reset = int_sha384_reset;
	md->update = int_sha384_update;
	md->finish = int_sha384_finish;
	md->free = int_sha384_free;

	md->reset(md);
}

void
init_sha512(PX_MD *md)
{
	SHA512_CTX *ctx;

	ctx = px_alloc(sizeof(*ctx));
	memset(ctx, 0, sizeof(*ctx));

	md->p.ptr = ctx;

	md->result_size = int_sha512_len;
	md->block_size = int_sha512_block_len;
	md->reset = int_sha512_reset;
	md->update = int_sha512_update;
	md->finish = int_sha512_finish;
	md->free = int_sha512_free;

	md->reset(md);
}
