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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/openssl_digest.h"
#include "absl/strings/string_view.h"
#include "rtc_base/checks.h" // RTC_DCHECK, RTC_CHECK
#include "rtc_base/openssl.h"
namespace rtc {
OpenSSLDigest::OpenSSLDigest(absl::string_view algorithm) {
ctx_ = EVP_MD_CTX_new();
RTC_CHECK(ctx_ != nullptr);
EVP_MD_CTX_init(ctx_);
if (GetDigestEVP(algorithm, &md_)) {
EVP_DigestInit_ex(ctx_, md_, nullptr);
} else {
md_ = nullptr;
}
}
OpenSSLDigest::~OpenSSLDigest() {
EVP_MD_CTX_destroy(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_, nullptr); // prepare for future Update()s
RTC_DCHECK(md_len == Size());
return md_len;
}
bool OpenSSLDigest::GetDigestEVP(absl::string_view 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
RTC_DCHECK(EVP_MD_size(md) >= 16);
*mdp = md;
return true;
}
bool OpenSSLDigest::GetDigestName(const EVP_MD* md, std::string* algorithm) {
RTC_DCHECK(md != nullptr);
RTC_DCHECK(algorithm != nullptr);
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(absl::string_view algorithm, size_t* length) {
const EVP_MD* md;
if (!GetDigestEVP(algorithm, &md))
return false;
*length = EVP_MD_size(md);
return true;
}
} // namespace rtc
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