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// Copyright (c) 2013 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 "content/renderer/webcrypto/webcrypto_impl.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/WebKit/public/platform/WebArrayBuffer.h"
#include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
#include "third_party/WebKit/public/platform/WebCryptoKey.h"
namespace content {
WebCryptoImpl::WebCryptoImpl() {
Init();
}
// static
// TODO(eroman): This works by re-allocating a new buffer. It would be better if
// the WebArrayBuffer could just be truncated instead.
void WebCryptoImpl::ShrinkBuffer(
WebKit::WebArrayBuffer* buffer,
unsigned new_size) {
DCHECK_LE(new_size, buffer->byteLength());
if (new_size == buffer->byteLength())
return;
WebKit::WebArrayBuffer new_buffer =
WebKit::WebArrayBuffer::create(new_size, 1);
DCHECK(!new_buffer.isNull());
memcpy(new_buffer.data(), buffer->data(), new_size);
*buffer = new_buffer;
}
// static
// TODO(eroman): Expose functionality in Blink instead.
WebKit::WebCryptoKey WebCryptoImpl::NullKey() {
// Needs a non-null algorithm to succeed.
return WebKit::WebCryptoKey::create(
NULL, WebKit::WebCryptoKeyTypeSecret, false,
WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(
WebKit::WebCryptoAlgorithmIdAesGcm, NULL), 0);
}
void WebCryptoImpl::encrypt(
const WebKit::WebCryptoAlgorithm& algorithm,
const WebKit::WebCryptoKey& key,
const unsigned char* data,
unsigned data_size,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
WebKit::WebArrayBuffer buffer;
if (!EncryptInternal(algorithm, key, data, data_size, &buffer)) {
result.completeWithError();
} else {
result.completeWithBuffer(buffer);
}
}
void WebCryptoImpl::decrypt(
const WebKit::WebCryptoAlgorithm& algorithm,
const WebKit::WebCryptoKey& key,
const unsigned char* data,
unsigned data_size,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
WebKit::WebArrayBuffer buffer;
if (!DecryptInternal(algorithm, key, data, data_size, &buffer)) {
result.completeWithError();
} else {
result.completeWithBuffer(buffer);
}
}
void WebCryptoImpl::digest(
const WebKit::WebCryptoAlgorithm& algorithm,
const unsigned char* data,
unsigned data_size,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
WebKit::WebArrayBuffer buffer;
if (!DigestInternal(algorithm, data, data_size, &buffer)) {
result.completeWithError();
} else {
result.completeWithBuffer(buffer);
}
}
void WebCryptoImpl::generateKey(
const WebKit::WebCryptoAlgorithm& algorithm,
bool extractable,
WebKit::WebCryptoKeyUsageMask usage_mask,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
WebKit::WebCryptoKey key = NullKey();
if (!GenerateKeyInternal(algorithm, extractable, usage_mask, &key)) {
result.completeWithError();
} else {
DCHECK(key.handle());
DCHECK_EQ(algorithm.id(), key.algorithm().id());
DCHECK_EQ(extractable, key.extractable());
DCHECK_EQ(usage_mask, key.usages());
result.completeWithKey(key);
}
}
void WebCryptoImpl::importKey(
WebKit::WebCryptoKeyFormat format,
const unsigned char* key_data,
unsigned key_data_size,
const WebKit::WebCryptoAlgorithm& algorithm_or_null,
bool extractable,
WebKit::WebCryptoKeyUsageMask usage_mask,
WebKit::WebCryptoResult result) {
WebKit::WebCryptoKey key = NullKey();
if (!ImportKeyInternal(format,
key_data,
key_data_size,
algorithm_or_null,
extractable,
usage_mask,
&key)) {
result.completeWithError();
return;
}
DCHECK(key.handle());
DCHECK(!key.algorithm().isNull());
DCHECK_EQ(extractable, key.extractable());
result.completeWithKey(key);
}
void WebCryptoImpl::sign(
const WebKit::WebCryptoAlgorithm& algorithm,
const WebKit::WebCryptoKey& key,
const unsigned char* data,
unsigned data_size,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
WebKit::WebArrayBuffer buffer;
if (!SignInternal(algorithm, key, data, data_size, &buffer)) {
result.completeWithError();
} else {
result.completeWithBuffer(buffer);
}
}
void WebCryptoImpl::verifySignature(
const WebKit::WebCryptoAlgorithm& algorithm,
const WebKit::WebCryptoKey& key,
const unsigned char* signature,
unsigned signature_size,
const unsigned char* data,
unsigned data_size,
WebKit::WebCryptoResult result) {
DCHECK(!algorithm.isNull());
bool signature_match = false;
if (!VerifySignatureInternal(algorithm,
key,
signature,
signature_size,
data,
data_size,
&signature_match)) {
result.completeWithError();
} else {
result.completeWithBoolean(signature_match);
}
}
} // namespace content
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