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* Copyright 2004--2012, Google Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "talk/base/openssldigest.h"
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#include "talk/base/common.h"
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OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
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EVP_MD_CTX_init(&ctx_);
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if (GetDigestEVP(algorithm, &md_)) {
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EVP_DigestInit_ex(&ctx_, md_, NULL);
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OpenSSLDigest::~OpenSSLDigest() {
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EVP_MD_CTX_cleanup(&ctx_);
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size_t OpenSSLDigest::Size() const {
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return EVP_MD_size(md_);
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void OpenSSLDigest::Update(const void* buf, size_t len) {
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EVP_DigestUpdate(&ctx_, buf, len);
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size_t OpenSSLDigest::Finish(void* buf, size_t len) {
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if (!md_ || len < Size()) {
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EVP_DigestFinal_ex(&ctx_, static_cast<unsigned char*>(buf), &md_len);
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EVP_DigestInit_ex(&ctx_, md_, NULL); // prepare for future Update()s
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ASSERT(md_len == Size());
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bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm,
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if (algorithm == DIGEST_MD5) {
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} else if (algorithm == DIGEST_SHA_1) {
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#if OPENSSL_VERSION_NUMBER >= 0x00908000L
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} else if (algorithm == DIGEST_SHA_224) {
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} else if (algorithm == DIGEST_SHA_256) {
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} else if (algorithm == DIGEST_SHA_384) {
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} else if (algorithm == DIGEST_SHA_512) {
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ASSERT(EVP_MD_size(md) >= 16);
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bool OpenSSLDigest::GetDigestSize(const std::string& algorithm,
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if (!GetDigestEVP(algorithm, &md))
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*length = EVP_MD_size(md);
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} // namespace talk_base