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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/logging.h"
#include "base/memory/ptr_util.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 {
// Implementation of blink::WebCryptoDigester, an internal Blink detail not
// part of WebCrypto, that allows chunks of data to be streamed in before
// computing a SHA-* digest (as opposed to ShaImplementation, which computes
// digests over complete messages)
class DigestorImpl : public blink::WebCryptoDigestor {
public:
explicit DigestorImpl(blink::WebCryptoAlgorithmId algorithm_id)
: initialized_(false),
algorithm_id_(algorithm_id) {}
bool Consume(const unsigned char* data, unsigned int size) override {
return ConsumeWithStatus(data, size).IsSuccess();
}
Status ConsumeWithStatus(const unsigned char* data, unsigned int size) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
Status error = Init();
if (!error.IsSuccess())
return error;
if (!EVP_DigestUpdate(digest_context_.get(), data, size))
return Status::OperationError();
return Status::Success();
}
bool Finish(unsigned char*& result_data,
unsigned int& result_data_size) override {
Status error = FinishInternal(result_, &result_data_size);
if (!error.IsSuccess())
return false;
result_data = result_;
return true;
}
Status FinishWithVectorAndStatus(std::vector<uint8_t>* result) {
const size_t hash_expected_size = EVP_MD_CTX_size(digest_context_.get());
result->resize(hash_expected_size);
unsigned int hash_buffer_size; // ignored
return FinishInternal(result->data(), &hash_buffer_size);
}
private:
Status Init() {
if (initialized_)
return Status::Success();
const EVP_MD* digest_algorithm = GetDigest(algorithm_id_);
if (!digest_algorithm)
return Status::ErrorUnsupported();
if (!EVP_DigestInit_ex(digest_context_.get(), digest_algorithm, NULL))
return Status::OperationError();
initialized_ = true;
return Status::Success();
}
Status FinishInternal(unsigned char* result, unsigned int* result_size) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
Status error = Init();
if (!error.IsSuccess())
return error;
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));
if (!EVP_DigestFinal_ex(digest_context_.get(), result, result_size) ||
*result_size != hash_expected_size)
return Status::OperationError();
return Status::Success();
}
bool initialized_;
bssl::ScopedEVP_MD_CTX digest_context_;
blink::WebCryptoAlgorithmId algorithm_id_;
unsigned char result_[EVP_MAX_MD_SIZE];
};
class ShaImplementation : public AlgorithmImplementation {
public:
Status Digest(const blink::WebCryptoAlgorithm& algorithm,
const CryptoData& data,
std::vector<uint8_t>* buffer) const override {
DigestorImpl digestor(algorithm.Id());
Status error = digestor.ConsumeWithStatus(data.bytes(), data.byte_length());
// http://crbug.com/366427: the spec does not define any other failures for
// digest, so none of the subsequent errors are spec compliant.
if (!error.IsSuccess())
return error;
return digestor.FinishWithVectorAndStatus(buffer);
}
};
} // namespace
std::unique_ptr<AlgorithmImplementation> CreateShaImplementation() {
return base::MakeUnique<ShaImplementation>();
}
std::unique_ptr<blink::WebCryptoDigestor> CreateDigestorImplementation(
blink::WebCryptoAlgorithmId algorithm) {
return std::unique_ptr<blink::WebCryptoDigestor>(new DigestorImpl(algorithm));
}
} // namespace webcrypto
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