providers/common/digests/sha2.c

   1 /*
   2  * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/sha.h>
  11 #include <openssl/crypto.h>
  12 #include <openssl/core_numbers.h>
  13 #include "internal/provider_algs.h"
  14
  15 /*
  16  * Forward declaration of everything implemented here.  This is not strictly
  17  * necessary for the compiler, but provides an assurance that the signatures
  18  * of the functions in the dispatch table are correct.
  19  */
  20 static OSSL_OP_digest_newctx_fn sha256_newctx;
  21 #if 0                           /* Not defined here */
  22 static OSSL_OP_digest_init_fn sha256_init;
  23 static OSSL_OP_digest_update_fn sha256_update;
  24 #endif
  25 static OSSL_OP_digest_final_fn sha256_final;
  26 static OSSL_OP_digest_freectx_fn sha256_freectx;
  27 static OSSL_OP_digest_dupctx_fn sha256_dupctx;
  28 static OSSL_OP_digest_size_fn sha256_size;
  29 static OSSL_OP_digest_block_size_fn sha256_size;
  30
  31 static int sha256_final(void *ctx,
  32                         unsigned char *md, size_t *mdl, size_t mdsz)
  33 {
  34     if (mdsz >= SHA256_DIGEST_LENGTH
  35         && SHA256_Final(md, ctx)) {
  36         *mdl = SHA256_DIGEST_LENGTH;
  37         return 1;
  38     }
  39
  40     return 0;
  41 }
  42
  43 static void *sha256_newctx(void)
  44 {
  45     SHA256_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
  46
  47     return ctx;
  48 }
  49
  50 static void sha256_freectx(void *vctx)
  51 {
  52     SHA256_CTX *ctx = (SHA256_CTX *)vctx;
  53
  54     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  55 }
  56
  57 static void *sha256_dupctx(void *ctx)
  58 {
  59     SHA256_CTX *in = (SHA256_CTX *)ctx;
  60     SHA256_CTX *ret = OPENSSL_malloc(sizeof(*ret));
  61
  62     *ret = *in;
  63
  64     return ret;
  65 }
  66
  67 static size_t sha256_size(void)
  68 {
  69     return SHA256_DIGEST_LENGTH;
  70 }
  71
  72 static size_t sha256_block_size(void)
  73 {
  74     return SHA256_CBLOCK;
  75 }
  76
  77 const OSSL_DISPATCH sha256_functions[] = {
  78     { OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))sha256_newctx },
  79     { OSSL_FUNC_DIGEST_INIT, (void (*)(void))SHA256_Init },
  80     { OSSL_FUNC_DIGEST_UPDATE, (void (*)(void))SHA256_Update },
  81     { OSSL_FUNC_DIGEST_FINAL, (void (*)(void))sha256_final },
  82     { OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))sha256_freectx },
  83     { OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))sha256_dupctx },
  84     { OSSL_FUNC_DIGEST_SIZE, (void (*)(void))sha256_size },
  85     { OSSL_FUNC_DIGEST_BLOCK_SIZE, (void (*)(void))sha256_block_size },
  86     { 0, NULL }
  87 };