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/*
* Copyright 2019 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
* https://www.openssl.org/source/license.html
*/
#include <openssl/sha.h>
#include <openssl/crypto.h>
#include <openssl/core_numbers.h>
/*
* Forward declaration of everything implemented here. This is not strictly
* necessary for the compiler, but provides an assurance that the signatures
* of the functions in the dispatch table are correct.
*/
static OSSL_OP_digest_newctx_fn sha256_newctx;
#if 0 /* Not defined here */
static OSSL_OP_digest_init_fn sha256_init;
static OSSL_OP_digest_update_fn sha256_update;
#endif
static OSSL_OP_digest_final_fn sha256_final;
static OSSL_OP_digest_freectx_fn sha256_freectx;
static OSSL_OP_digest_dupctx_fn sha256_dupctx;
static OSSL_OP_digest_size_fn sha256_size;
static OSSL_OP_digest_block_size_fn sha256_size;
static int sha256_final(void *ctx,
unsigned char *md, size_t *mdl, size_t mdsz)
{
if (mdsz >= SHA256_DIGEST_LENGTH
&& SHA256_Final(md, ctx)) {
*mdl = SHA256_DIGEST_LENGTH;
return 1;
}
return 0;
}
static void *sha256_newctx(void)
{
SHA256_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
return ctx;
}
static void sha256_freectx(void *vctx)
{
SHA256_CTX *ctx = (SHA256_CTX *)vctx;
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
static void *sha256_dupctx(void *ctx)
{
SHA256_CTX *in = (SHA256_CTX *)ctx;
SHA256_CTX *ret = OPENSSL_malloc(sizeof(*ret));
*ret = *in;
return ret;
}
static size_t sha256_size(void)
{
return SHA256_DIGEST_LENGTH;
}
static size_t sha256_block_size(void)
{
return SHA256_CBLOCK;
}
extern const OSSL_DISPATCH sha256_functions[];
const OSSL_DISPATCH sha256_functions[] = {
{ OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))sha256_newctx },
{ OSSL_FUNC_DIGEST_INIT, (void (*)(void))SHA256_Init },
{ OSSL_FUNC_DIGEST_UPDDATE, (void (*)(void))SHA256_Update },
{ OSSL_FUNC_DIGEST_FINAL, (void (*)(void))sha256_final },
{ OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))sha256_freectx },
{ OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))sha256_dupctx },
{ OSSL_FUNC_DIGEST_SIZE, (void (*)(void))sha256_size },
{ OSSL_FUNC_DIGEST_BLOCK_SIZE, (void (*)(void))sha256_block_size },
{ 0, NULL }
};
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