Differential D17578 Diff 47568 protocols/jabber/libjingle/talk/base/openssldigest.cc

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protocols/jabber/libjingle/talk/base/openssldigest.cc

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27 27​
28#include "talk/base/openssldigest.h" 28​#include "talk/base/openssldigest.h"
29 29​
30#include "talk/base/common.h" 30​#include "talk/base/common.h"
31 31​
32namespace talk_base { 32​namespace talk_base {
33 33​
34OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) { 34​OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
35 EVP_MD_CTX_init(&ctx_); 35​ EVP_MD_CTX_init(ctx_);
36 if (GetDigestEVP(algorithm, &md_)) { 36​ if (GetDigestEVP(algorithm, &md_)) {
37 EVP_DigestInit_ex(&ctx_, md_, NULL); 37​ EVP_DigestInit_ex(ctx_, md_, NULL);
38 } else { 38​ } else {
39 md_ = NULL; 39​ md_ = NULL;
40 } 40​ }
41} 41​}
42 42​
43OpenSSLDigest::~OpenSSLDigest() { 43​OpenSSLDigest::~OpenSSLDigest() {
44 EVP_MD_CTX_cleanup(&ctx_); 44​ EVP_MD_CTX_destroy(ctx_);
45} 45​}
46 46​
47size_t OpenSSLDigest::Size() const { 47​size_t OpenSSLDigest::Size() const {
48 if (!md_) { 48​ if (!md_) {
49 return 0; 49​ return 0;
50 } 50​ }
51 return EVP_MD_size(md_); 51​ return EVP_MD_size(md_);
52} 52​}
53 53​
54void OpenSSLDigest::Update(const void* buf, size_t len) { 54​void OpenSSLDigest::Update(const void* buf, size_t len) {
55 if (!md_) { 55​ if (!md_) {
56 return; 56​ return;
57 } 57​ }
58 EVP_DigestUpdate(&ctx_, buf, len); 58​ EVP_DigestUpdate(ctx_, buf, len);
59} 59​}
60 60​
61size_t OpenSSLDigest::Finish(void* buf, size_t len) { 61​size_t OpenSSLDigest::Finish(void* buf, size_t len) {
62 if (!md_ || len < Size()) { 62​ if (!md_ || len < Size()) {
63 return 0; 63​ return 0;
64 } 64​ }
65 unsigned int md_len; 65​ unsigned int md_len;
66 EVP_DigestFinal_ex(&ctx_, static_cast<unsigned char*>(buf), &md_len); 66​ EVP_DigestFinal_ex(ctx_, static_cast<unsigned char*>(buf), &md_len);
67 EVP_DigestInit_ex(&ctx_, md_, NULL); // prepare for future Update()s 67​ EVP_DigestInit_ex(ctx_, md_, NULL); // prepare for future Update()s
68 ASSERT(md_len == Size()); 68​ ASSERT(md_len == Size());
69 return md_len; 69​ return md_len;
70} 70​}
71 71​
72bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm, 72​bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm,
73 const EVP_MD** mdp) { 73​ const EVP_MD** mdp) {
74 const EVP_MD* md; 74​ const EVP_MD* md;
75 if (algorithm == DIGEST_MD5) { 75​ if (algorithm == DIGEST_MD5) {
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