119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/openssl_digest.h"
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#include "rtc_base/checks.h" // RTC_DCHECK, RTC_CHECK
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#include "rtc_base/openssl.h"
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namespace rtc {
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OpenSSLDigest::OpenSSLDigest(const std::string& algorithm) {
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ctx_ = EVP_MD_CTX_new();
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RTC_CHECK(ctx_ != nullptr);
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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_, nullptr);
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} else {
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md_ = nullptr;
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}
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}
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OpenSSLDigest::~OpenSSLDigest() {
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EVP_MD_CTX_destroy(ctx_);
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}
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size_t OpenSSLDigest::Size() const {
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if (!md_) {
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return 0;
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}
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return EVP_MD_size(md_);
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}
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void OpenSSLDigest::Update(const void* buf, size_t len) {
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if (!md_) {
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return;
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}
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EVP_DigestUpdate(ctx_, buf, len);
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}
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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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return 0;
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}
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unsigned int md_len;
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EVP_DigestFinal_ex(ctx_, static_cast<unsigned char*>(buf), &md_len);
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EVP_DigestInit_ex(ctx_, md_, nullptr); // prepare for future Update()s
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RTC_DCHECK(md_len == Size());
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return md_len;
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}
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bool OpenSSLDigest::GetDigestEVP(const std::string& algorithm,
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const EVP_MD** mdp) {
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const EVP_MD* md;
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if (algorithm == DIGEST_MD5) {
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md = EVP_md5();
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} else if (algorithm == DIGEST_SHA_1) {
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md = EVP_sha1();
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} else if (algorithm == DIGEST_SHA_224) {
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md = EVP_sha224();
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} else if (algorithm == DIGEST_SHA_256) {
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md = EVP_sha256();
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} else if (algorithm == DIGEST_SHA_384) {
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md = EVP_sha384();
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} else if (algorithm == DIGEST_SHA_512) {
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md = EVP_sha512();
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} else {
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return false;
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}
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// Can't happen
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RTC_DCHECK(EVP_MD_size(md) >= 16);
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*mdp = md;
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return true;
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}
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bool OpenSSLDigest::GetDigestName(const EVP_MD* md, std::string* algorithm) {
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RTC_DCHECK(md != nullptr);
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RTC_DCHECK(algorithm != nullptr);
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int md_type = EVP_MD_type(md);
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if (md_type == NID_md5) {
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*algorithm = DIGEST_MD5;
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} else if (md_type == NID_sha1) {
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*algorithm = DIGEST_SHA_1;
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} else if (md_type == NID_sha224) {
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*algorithm = DIGEST_SHA_224;
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} else if (md_type == NID_sha256) {
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*algorithm = DIGEST_SHA_256;
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} else if (md_type == NID_sha384) {
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*algorithm = DIGEST_SHA_384;
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} else if (md_type == NID_sha512) {
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*algorithm = DIGEST_SHA_512;
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} else {
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algorithm->clear();
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return false;
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}
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return true;
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}
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bool OpenSSLDigest::GetDigestSize(const std::string& algorithm,
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size_t* length) {
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const EVP_MD* md;
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if (!GetDigestEVP(algorithm, &md))
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return false;
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*length = EVP_MD_size(md);
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return true;
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}
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} // namespace rtc
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