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
  14 static int sha256_final(void *ctx,
  15                         unsigned char *md, size_t *mdl, size_t mdsz)
  16 {
  17     if (mdsz >= SHA256_DIGEST_LENGTH
  18         && SHA256_Final(md, ctx)) {
  19         *mdl = SHA256_DIGEST_LENGTH;
  20         return 1;
  21     }
  22
  23     return 0;
  24 }
  25
  26 static void *sha256_newctx(void)
  27 {
  28     SHA256_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
  29
  30     return ctx;
  31 }
  32
  33 static void sha256_freectx(void *vctx)
  34 {
  35     SHA256_CTX *ctx = (SHA256_CTX *)vctx;
  36
  37     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  38 }
  39
  40 static void *sha256_dupctx(void *ctx)
  41 {
  42     SHA256_CTX *in = (SHA256_CTX *)ctx;
  43     SHA256_CTX *ret = OPENSSL_malloc(sizeof(*ret));
  44
  45     *ret = *in;
  46
  47     return ret;
  48 }
  49
  50 static size_t sha256_size(void)
  51 {
  52     return SHA256_DIGEST_LENGTH;
  53 }
  54
  55 static size_t sha256_block_size(void)
  56 {
  57     return SHA256_CBLOCK;
  58 }
  59
  60 extern const OSSL_DISPATCH sha256_functions[];
  61 const OSSL_DISPATCH sha256_functions[] = {
  62     { OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))sha256_newctx },
  63     { OSSL_FUNC_DIGEST_INIT, (void (*)(void))SHA256_Init },
  64     { OSSL_FUNC_DIGEST_UPDDATE, (void (*)(void))SHA256_Update },
  65     { OSSL_FUNC_DIGEST_FINAL, (void (*)(void))sha256_final },
  66     { OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))sha256_freectx },
  67     { OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))sha256_dupctx },
  68     { OSSL_FUNC_DIGEST_SIZE, (void (*)(void))sha256_size },
  69     { OSSL_FUNC_DIGEST_BLOCK_SIZE, (void (*)(void))sha256_block_size },
  70     { 0, NULL }
  71 };