html_viewer: Move webcrypto to a place where html_viewer can use it.

content/child/webcrypto/openssl/sha_openssl.cc

-// 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 <vector>
-#include <openssl/evp.h>
-#include <openssl/sha.h>
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "content/child/webcrypto/algorithm_implementation.h"
-#include "content/child/webcrypto/crypto_data.h"
-#include "content/child/webcrypto/openssl/util_openssl.h"
-#include "content/child/webcrypto/status.h"
-#include "content/child/webcrypto/webcrypto_util.h"
-#include "crypto/openssl_util.h"
-#include "crypto/scoped_openssl_types.h"
-
-namespace content {
-
-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 DigestorOpenSsl : public blink::WebCryptoDigestor {
- public:
-  explicit DigestorOpenSsl(blink::WebCryptoAlgorithmId algorithm_id)
-      : initialized_(false),
-        digest_context_(EVP_MD_CTX_create()),
-        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 int hash_expected_size = EVP_MD_CTX_size(digest_context_.get());
-    result->resize(hash_expected_size);
-    unsigned char* const hash_buffer = vector_as_array(result);
-    unsigned int hash_buffer_size;  // ignored
-    return FinishInternal(hash_buffer, &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 (!digest_context_.get())
-      return Status::OperationError();
-
-    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 int hash_expected_size = EVP_MD_CTX_size(digest_context_.get());
-    if (hash_expected_size <= 0)
-      return Status::ErrorUnexpected();
-    DCHECK_LE(hash_expected_size, EVP_MAX_MD_SIZE);
-
-    if (!EVP_DigestFinal_ex(digest_context_.get(), result, result_size) ||
-        static_cast<int>(*result_size) != hash_expected_size)
-      return Status::OperationError();
-
-    return Status::Success();
-  }
-
-  bool initialized_;
-  crypto::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 {
-    DigestorOpenSsl 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
-
-AlgorithmImplementation* CreatePlatformShaImplementation() {
-  return new ShaImplementation();
-}
-
-scoped_ptr<blink::WebCryptoDigestor> CreatePlatformDigestor(
-    blink::WebCryptoAlgorithmId algorithm) {
-  return scoped_ptr<blink::WebCryptoDigestor>(new DigestorOpenSsl(algorithm));
-}
-
-}  // namespace webcrypto
-
-}  // namespace content