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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <vector>
#include "base/check_op.h"
#include "components/webcrypto/algorithm_implementation.h"
#include "components/webcrypto/algorithms/util.h"
#include "components/webcrypto/crypto_data.h"
#include "components/webcrypto/status.h"
#include "crypto/openssl_util.h"
#include "third_party/boringssl/src/include/openssl/digest.h"
namespace webcrypto {
namespace {
class ShaImplementation : public AlgorithmImplementation {
public:
Status Digest(const blink::WebCryptoAlgorithm& algorithm,
const CryptoData& data,
std::vector<uint8_t>* buffer) const override {
// http://crbug.com/366427: the spec does not define any other failures for
// digest, so none of the subsequent errors are spec compliant.
bssl::ScopedEVP_MD_CTX digest_context;
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
const EVP_MD* digest_algorithm = GetDigest(algorithm.Id());
if (!digest_algorithm)
return Status::ErrorUnsupported();
if (!EVP_DigestInit_ex(digest_context.get(), digest_algorithm, nullptr))
return Status::OperationError();
if (!EVP_DigestUpdate(digest_context.get(), data.bytes(),
data.byte_length()))
return Status::OperationError();
const size_t hash_expected_size = EVP_MD_CTX_size(digest_context.get());
if (hash_expected_size == 0)
return Status::ErrorUnexpected();
DCHECK_LE(hash_expected_size, static_cast<unsigned>(EVP_MAX_MD_SIZE));
buffer->resize(hash_expected_size);
unsigned result_size; // ignored
if (!EVP_DigestFinal_ex(digest_context.get(), buffer->data(),
&result_size) ||
result_size != hash_expected_size)
return Status::OperationError();
return Status::Success();
}
};
} // namespace
std::unique_ptr<AlgorithmImplementation> CreateShaImplementation() {
return std::make_unique<ShaImplementation>();
}
} // namespace webcrypto
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