1 /*
2 * libjingle
3 * Copyright 2004--2012, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #if HAVE_OPENSSL_SSL_H
29
30 #include "talk/base/openssldigest.h"
31
32 #include "talk/base/common.h"
33
34 namespace talk_base {
35
OpenSSLDigest(const std::string & algorithm)36 OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
37 EVP_MD_CTX_init(&ctx_);
38 if (GetDigestEVP(algorithm, &md_)) {
39 EVP_DigestInit_ex(&ctx_, md_, NULL);
40 } else {
41 md_ = NULL;
42 }
43 }
44
~OpenSSLDigest()45 OpenSSLDigest::~OpenSSLDigest() {
46 EVP_MD_CTX_cleanup(&ctx_);
47 }
48
Size() const49 size_t OpenSSLDigest::Size() const {
50 if (!md_) {
51 return 0;
52 }
53 return EVP_MD_size(md_);
54 }
55
Update(const void * buf,size_t len)56 void OpenSSLDigest::Update(const void* buf, size_t len) {
57 if (!md_) {
58 return;
59 }
60 EVP_DigestUpdate(&ctx_, buf, len);
61 }
62
Finish(void * buf,size_t len)63 size_t OpenSSLDigest::Finish(void* buf, size_t len) {
64 if (!md_ || len < Size()) {
65 return 0;
66 }
67 unsigned int md_len;
68 EVP_DigestFinal_ex(&ctx_, static_cast<unsigned char*>(buf), &md_len);
69 EVP_DigestInit_ex(&ctx_, md_, NULL); // prepare for future Update()s
70 ASSERT(md_len == Size());
71 return md_len;
72 }
73
GetDigestEVP(const std::string & algorithm,const EVP_MD ** mdp)74 bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm,
75 const EVP_MD** mdp) {
76 const EVP_MD* md;
77 if (algorithm == DIGEST_MD5) {
78 md = EVP_md5();
79 } else if (algorithm == DIGEST_SHA_1) {
80 md = EVP_sha1();
81 #if OPENSSL_VERSION_NUMBER >= 0x00908000L
82 } else if (algorithm == DIGEST_SHA_224) {
83 md = EVP_sha224();
84 } else if (algorithm == DIGEST_SHA_256) {
85 md = EVP_sha256();
86 } else if (algorithm == DIGEST_SHA_384) {
87 md = EVP_sha384();
88 } else if (algorithm == DIGEST_SHA_512) {
89 md = EVP_sha512();
90 #endif
91 } else {
92 return false;
93 }
94
95 // Can't happen
96 ASSERT(EVP_MD_size(md) >= 16);
97 *mdp = md;
98 return true;
99 }
100
GetDigestName(const EVP_MD * md,std::string * algorithm)101 bool OpenSSLDigest::GetDigestName(const EVP_MD* md,
102 std::string* algorithm) {
103 ASSERT(md != NULL);
104 ASSERT(algorithm != NULL);
105
106 int md_type = EVP_MD_type(md);
107 if (md_type == NID_md5) {
108 *algorithm = DIGEST_MD5;
109 } else if (md_type == NID_sha1) {
110 *algorithm = DIGEST_SHA_1;
111 #if OPENSSL_VERSION_NUMBER >= 0x00908000L
112 } else if (md_type == NID_sha224) {
113 *algorithm = DIGEST_SHA_224;
114 } else if (md_type == NID_sha256) {
115 *algorithm = DIGEST_SHA_256;
116 } else if (md_type == NID_sha384) {
117 *algorithm = DIGEST_SHA_384;
118 } else if (md_type == NID_sha512) {
119 *algorithm = DIGEST_SHA_512;
120 #endif
121 } else {
122 algorithm->clear();
123 return false;
124 }
125
126 return true;
127 }
128
GetDigestSize(const std::string & algorithm,size_t * length)129 bool OpenSSLDigest::GetDigestSize(const std::string& algorithm,
130 size_t* length) {
131 const EVP_MD *md;
132 if (!GetDigestEVP(algorithm, &md))
133 return false;
134
135 *length = EVP_MD_size(md);
136 return true;
137 }
138
139 } // namespace talk_base
140
141 #endif // HAVE_OPENSSL_SSL_H
142
143