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      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 
     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 
     45 OpenSSLDigest::~OpenSSLDigest() {
     46   EVP_MD_CTX_cleanup(&ctx_);
     47 }
     48 
     49 size_t OpenSSLDigest::Size() const {
     50   if (!md_) {
     51     return 0;
     52   }
     53   return EVP_MD_size(md_);
     54 }
     55 
     56 void OpenSSLDigest::Update(const void* buf, size_t len) {
     57   if (!md_) {
     58     return;
     59   }
     60   EVP_DigestUpdate(&ctx_, buf, len);
     61 }
     62 
     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 
     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 
    101 bool OpenSSLDigest::GetDigestSize(const std::string& algorithm,
    102                                   size_t* length) {
    103   const EVP_MD *md;
    104   if (!GetDigestEVP(algorithm, &md))
    105     return false;
    106 
    107   *length = EVP_MD_size(md);
    108   return true;
    109 }
    110 
    111 }  // namespace talk_base
    112 
    113 #endif  // HAVE_OPENSSL_SSL_H
    114 
    115