1 /*
2 * Copyright 1995-2022 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 /*
11 * SHA-1 low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <openssl/crypto.h>
17 #include <openssl/opensslconf.h>
18
19 #include <openssl/opensslv.h>
20 #include <openssl/evp.h>
21 #include <openssl/sha.h>
22
23 /* The implementation is in crypto/md32_common.h */
24
25 #include "sha_local.h"
26 #include "crypto/sha.h"
27
ossl_sha1_ctrl(SHA_CTX * sha1,int cmd,int mslen,void * ms)28 int ossl_sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms)
29 {
30 unsigned char padtmp[40];
31 unsigned char sha1tmp[SHA_DIGEST_LENGTH];
32
33 if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)
34 return -2;
35
36 if (sha1 == NULL)
37 return 0;
38
39 /* SSLv3 client auth handling: see RFC-6101 5.6.8 */
40 if (mslen != 48)
41 return 0;
42
43 /* At this point hash contains all handshake messages, update
44 * with master secret and pad_1.
45 */
46
47 if (SHA1_Update(sha1, ms, mslen) <= 0)
48 return 0;
49
50 /* Set padtmp to pad_1 value */
51 memset(padtmp, 0x36, sizeof(padtmp));
52
53 if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
54 return 0;
55
56 if (!SHA1_Final(sha1tmp, sha1))
57 return 0;
58
59 /* Reinitialise context */
60
61 if (!SHA1_Init(sha1))
62 return 0;
63
64 if (SHA1_Update(sha1, ms, mslen) <= 0)
65 return 0;
66
67 /* Set padtmp to pad_2 value */
68 memset(padtmp, 0x5c, sizeof(padtmp));
69
70 if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))
71 return 0;
72
73 if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp)))
74 return 0;
75
76 /* Now when ctx is finalised it will return the SSL v3 hash value */
77 OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));
78
79 return 1;
80 }
81
