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/*
* libjingle
* Copyright 2004--2012, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if HAVE_OPENSSL_SSL_H
#include "talk/base/openssldigest.h"
#include "talk/base/common.h"
#include "talk/base/openssl.h"
namespace talk_base {
OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
EVP_MD_CTX_init(&ctx_);
if (GetDigestEVP(algorithm, &md_)) {
EVP_DigestInit_ex(&ctx_, md_, NULL);
} else {
md_ = NULL;
}
}
OpenSSLDigest::~OpenSSLDigest() {
EVP_MD_CTX_cleanup(&ctx_);
}
size_t OpenSSLDigest::Size() const {
if (!md_) {
return 0;
}
return EVP_MD_size(md_);
}
void OpenSSLDigest::Update(const void* buf, size_t len) {
if (!md_) {
return;
}
EVP_DigestUpdate(&ctx_, buf, len);
}
size_t OpenSSLDigest::Finish(void* buf, size_t len) {
if (!md_ || len < Size()) {
return 0;
}
unsigned int md_len;
EVP_DigestFinal_ex(&ctx_, static_cast<unsigned char*>(buf), &md_len);
EVP_DigestInit_ex(&ctx_, md_, NULL); // prepare for future Update()s
ASSERT(md_len == Size());
return md_len;
}
bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm,
const EVP_MD** mdp) {
const EVP_MD* md;
if (algorithm == DIGEST_MD5) {
md = EVP_md5();
} else if (algorithm == DIGEST_SHA_1) {
md = EVP_sha1();
} else if (algorithm == DIGEST_SHA_224) {
md = EVP_sha224();
} else if (algorithm == DIGEST_SHA_256) {
md = EVP_sha256();
} else if (algorithm == DIGEST_SHA_384) {
md = EVP_sha384();
} else if (algorithm == DIGEST_SHA_512) {
md = EVP_sha512();
} else {
return false;
}
// Can't happen
ASSERT(EVP_MD_size(md) >= 16);
*mdp = md;
return true;
}
bool OpenSSLDigest::GetDigestName(const EVP_MD* md,
std::string* algorithm) {
ASSERT(md != NULL);
ASSERT(algorithm != NULL);
int md_type = EVP_MD_type(md);
if (md_type == NID_md5) {
*algorithm = DIGEST_MD5;
} else if (md_type == NID_sha1) {
*algorithm = DIGEST_SHA_1;
} else if (md_type == NID_sha224) {
*algorithm = DIGEST_SHA_224;
} else if (md_type == NID_sha256) {
*algorithm = DIGEST_SHA_256;
} else if (md_type == NID_sha384) {
*algorithm = DIGEST_SHA_384;
} else if (md_type == NID_sha512) {
*algorithm = DIGEST_SHA_512;
} else {
algorithm->clear();
return false;
}
return true;
}
bool OpenSSLDigest::GetDigestSize(const std::string& algorithm,
size_t* length) {
const EVP_MD *md;
if (!GetDigestEVP(algorithm, &md))
return false;
*length = EVP_MD_size(md);
return true;
}
} // namespace talk_base
#endif // HAVE_OPENSSL_SSL_H
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