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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/crypto.h"
#include "base/numerics/safe_conversions.h"
#include "crypto/openssl_util.h"
#include "third_party/blink/renderer/platform/wtf/shared_buffer.h"
#include "third_party/blink/renderer/platform/wtf/text/string_utf8_adaptor.h"
namespace blink {
Digestor::Digestor(HashAlgorithm algorithm) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
const EVP_MD* evp_md = nullptr;
switch (algorithm) {
case kHashAlgorithmSha1:
evp_md = EVP_sha1();
break;
case kHashAlgorithmSha256:
evp_md = EVP_sha256();
break;
case kHashAlgorithmSha384:
evp_md = EVP_sha384();
break;
case kHashAlgorithmSha512:
evp_md = EVP_sha512();
break;
}
has_failed_ =
!evp_md || !EVP_DigestInit_ex(digest_context_.get(), evp_md, nullptr);
}
Digestor::~Digestor() = default;
bool Digestor::Update(base::span<const uint8_t> data) {
if (has_failed_)
return false;
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
has_failed_ =
!EVP_DigestUpdate(digest_context_.get(), data.data(), data.size());
return !has_failed_;
}
bool Digestor::UpdateUtf8(const String& string, WTF::Utf8ConversionMode mode) {
StringUTF8Adaptor utf8(string, mode);
return Update(base::as_byte_span(utf8));
}
bool Digestor::Finish(DigestValue& digest_result) {
if (has_failed_)
return false;
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
const size_t expected_size = EVP_MD_CTX_size(digest_context_.get());
DCHECK_LE(expected_size, static_cast<size_t>(EVP_MAX_MD_SIZE));
digest_result.resize(base::checked_cast<wtf_size_t>(expected_size));
unsigned result_size;
has_failed_ = !EVP_DigestFinal_ex(digest_context_.get(), digest_result.data(),
&result_size) ||
result_size != expected_size;
return !has_failed_;
}
bool ComputeDigest(HashAlgorithm algorithm,
base::span<const uint8_t> digestable,
DigestValue& digest_result) {
Digestor digestor(algorithm);
digestor.Update(digestable);
digestor.Finish(digest_result);
return !digestor.has_failed();
}
bool ComputeDigest(HashAlgorithm algorithm,
const SegmentedBuffer* buffer,
DigestValue& digest_result) {
Digestor digestor(algorithm);
if (buffer) {
for (const auto& span : *buffer) {
digestor.Update(base::as_bytes(span));
}
}
digestor.Finish(digest_result);
return !digestor.has_failed();
}
} // namespace blink
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