| 1 | /*
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| 2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #if !defined(OPENSSL_NO_MD5)
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| 11 |
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| 12 | # include <openssl/evp.h>
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| 13 | # include <openssl/objects.h>
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| 14 | # include <openssl/x509.h>
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| 15 | # include <openssl/md5.h>
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| 16 | # include <openssl/sha.h>
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| 17 | # include "internal/cryptlib.h"
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| 18 | # include "crypto/evp.h"
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| 19 | # include <openssl/rsa.h>
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| 20 |
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| 21 | struct md5_sha1_ctx {
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| 22 | MD5_CTX md5;
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| 23 | SHA_CTX sha1;
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| 24 | };
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| 25 |
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| 26 | static int init(EVP_MD_CTX *ctx)
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| 27 | {
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| 28 | struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);
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| 29 | if (!MD5_Init(&mctx->md5))
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| 30 | return 0;
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| 31 | return SHA1_Init(&mctx->sha1);
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| 32 | }
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| 33 |
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| 34 | static int update(EVP_MD_CTX *ctx, const void *data, size_t count)
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| 35 | {
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| 36 | struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);
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| 37 | if (!MD5_Update(&mctx->md5, data, count))
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| 38 | return 0;
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| 39 | return SHA1_Update(&mctx->sha1, data, count);
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| 40 | }
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| 41 |
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| 42 | static int final(EVP_MD_CTX *ctx, unsigned char *md)
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| 43 | {
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| 44 | struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);
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| 45 | if (!MD5_Final(md, &mctx->md5))
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| 46 | return 0;
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| 47 | return SHA1_Final(md + MD5_DIGEST_LENGTH, &mctx->sha1);
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| 48 | }
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| 49 |
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| 50 | static int ctrl(EVP_MD_CTX *ctx, int cmd, int mslen, void *ms)
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| 51 | {
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| 52 | unsigned char padtmp[48];
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| 53 | unsigned char md5tmp[MD5_DIGEST_LENGTH];
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| 54 | unsigned char sha1tmp[SHA_DIGEST_LENGTH];
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| 55 | struct md5_sha1_ctx *mctx;
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| 56 |
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| 57 | if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)
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| 58 | return -2;
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| 59 |
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| 60 | if (ctx == NULL)
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| 61 | return 0;
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| 62 |
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| 63 | mctx = EVP_MD_CTX_md_data(ctx);
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| 64 |
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| 65 | /* SSLv3 client auth handling: see RFC-6101 5.6.8 */
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| 66 | if (mslen != 48)
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| 67 | return 0;
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| 68 |
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| 69 | /* At this point hash contains all handshake messages, update
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| 70 | * with master secret and pad_1.
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| 71 | */
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| 72 |
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| 73 | if (update(ctx, ms, mslen) <= 0)
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| 74 | return 0;
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| 75 |
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| 76 | /* Set padtmp to pad_1 value */
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| 77 | memset(padtmp, 0x36, sizeof(padtmp));
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| 78 |
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| 79 | if (!MD5_Update(&mctx->md5, padtmp, sizeof(padtmp)))
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| 80 | return 0;
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| 81 |
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| 82 | if (!MD5_Final(md5tmp, &mctx->md5))
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| 83 | return 0;
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| 84 |
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| 85 | if (!SHA1_Update(&mctx->sha1, padtmp, 40))
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| 86 | return 0;
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| 87 |
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| 88 | if (!SHA1_Final(sha1tmp, &mctx->sha1))
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| 89 | return 0;
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| 90 |
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| 91 | /* Reinitialise context */
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| 92 |
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| 93 | if (!init(ctx))
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| 94 | return 0;
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| 95 |
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| 96 | if (update(ctx, ms, mslen) <= 0)
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| 97 | return 0;
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| 98 |
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| 99 | /* Set padtmp to pad_2 value */
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| 100 | memset(padtmp, 0x5c, sizeof(padtmp));
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| 101 |
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| 102 | if (!MD5_Update(&mctx->md5, padtmp, sizeof(padtmp)))
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| 103 | return 0;
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| 104 |
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| 105 | if (!MD5_Update(&mctx->md5, md5tmp, sizeof(md5tmp)))
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| 106 | return 0;
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| 107 |
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| 108 | if (!SHA1_Update(&mctx->sha1, padtmp, 40))
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| 109 | return 0;
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| 110 |
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| 111 | if (!SHA1_Update(&mctx->sha1, sha1tmp, sizeof(sha1tmp)))
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| 112 | return 0;
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| 113 |
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| 114 | /* Now when ctx is finalised it will return the SSL v3 hash value */
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| 115 |
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| 116 | OPENSSL_cleanse(md5tmp, sizeof(md5tmp));
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| 117 | OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));
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| 118 |
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| 119 | return 1;
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| 120 |
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| 121 | }
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| 122 |
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| 123 | static const EVP_MD md5_sha1_md = {
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| 124 | NID_md5_sha1,
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| 125 | NID_md5_sha1,
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| 126 | MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
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| 127 | 0,
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| 128 | init,
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| 129 | update,
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| 130 | final,
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| 131 | NULL,
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| 132 | NULL,
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| 133 | MD5_CBLOCK,
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| 134 | sizeof(EVP_MD *) + sizeof(struct md5_sha1_ctx),
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| 135 | ctrl
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| 136 | };
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| 137 |
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| 138 | const EVP_MD *EVP_md5_sha1(void)
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| 139 | {
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| 140 | return &md5_sha1_md;
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| 141 | }
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| 142 | #endif
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