crypto/sha/sha1dgst.c

   1 /*
   2  * Copyright 1995-2016 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/crypto.h>
  11 #include <openssl/opensslconf.h>
  12
  13 #include <openssl/opensslv.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/sha.h>
  16
  17 /* The implementation is in ../md32_common.h */
  18
  19 #include "sha_local.h"
  20 #include "crypto/sha.h"
  21
  22 int sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms)
  23 {
  24     unsigned char padtmp[40];
  25     unsigned char sha1tmp[SHA_DIGEST_LENGTH];
  26
  27     if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)
  28         return -2;
  29
  30     if (sha1 == NULL)
  31         return 0;
  32
  33     /* SSLv3 client auth handling: see RFC-6101 5.6.8 */
  34     if (mslen != 48)
  35         return 0;
  36
  37     /* At this point hash contains all handshake messages, update
  38      * with master secret and pad_1.
  39      */
  40
  41     if (SHA1_Update(sha1, ms, mslen) <= 0)
  42         return 0;
  43
  44     /* Set padtmp to pad_1 value */
  45     memset(padtmp, 0x36, sizeof(padtmp));
  46
  47     if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
  48         return 0;
  49
  50     if (!SHA1_Final(sha1tmp, sha1))
  51         return 0;
  52
  53     /* Reinitialise context */
  54
  55     if (!SHA1_Init(sha1))
  56         return 0;
  57
  58     if (SHA1_Update(sha1, ms, mslen) <= 0)
  59         return 0;
  60
  61     /* Set padtmp to pad_2 value */
  62     memset(padtmp, 0x5c, sizeof(padtmp));
  63
  64     if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
  65         return 0;
  66
  67     if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp)))
  68         return 0;
  69
  70     /* Now when ctx is finalised it will return the SSL v3 hash value */
  71     OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));
  72
  73     return 1;
  74 }