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// Copyright 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_util.h"
#include "base/base64.h"
#include "base/logging.h"
#include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
namespace content {
namespace webcrypto {
namespace {
blink::WebCryptoAlgorithm CreateAesKeyGenAlgorithm(
blink::WebCryptoAlgorithmId aes_alg_id,
unsigned short length) {
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
aes_alg_id, new blink::WebCryptoAesKeyGenParams(length));
}
bool IsHashAlgorithm(blink::WebCryptoAlgorithmId alg_id) {
return alg_id == blink::WebCryptoAlgorithmIdSha1 ||
alg_id == blink::WebCryptoAlgorithmIdSha224 ||
alg_id == blink::WebCryptoAlgorithmIdSha256 ||
alg_id == blink::WebCryptoAlgorithmIdSha384 ||
alg_id == blink::WebCryptoAlgorithmIdSha512;
}
} // namespace
const uint8* Uint8VectorStart(const std::vector<uint8>& data) {
if (data.empty())
return NULL;
return &data[0];
}
void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned new_size) {
DCHECK_LE(new_size, buffer->byteLength());
if (new_size == buffer->byteLength())
return;
blink::WebArrayBuffer new_buffer = blink::WebArrayBuffer::create(new_size, 1);
DCHECK(!new_buffer.isNull());
memcpy(new_buffer.data(), buffer->data(), new_size);
*buffer = new_buffer;
}
blink::WebArrayBuffer CreateArrayBuffer(const uint8* data, unsigned data_size) {
blink::WebArrayBuffer buffer = blink::WebArrayBuffer::create(data_size, 1);
DCHECK(!buffer.isNull());
if (data_size) // data_size == 0 might mean the data pointer is invalid
memcpy(buffer.data(), data, data_size);
return buffer;
}
// This function decodes unpadded 'base64url' encoded data, as described in
// RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. To do this, first
// change the incoming data to 'base64' encoding by applying the appropriate
// transformation including adding padding if required, and then call a base64
// decoder.
bool Base64DecodeUrlSafe(const std::string& input, std::string* output) {
std::string base64EncodedText(input);
std::replace(base64EncodedText.begin(), base64EncodedText.end(), '-', '+');
std::replace(base64EncodedText.begin(), base64EncodedText.end(), '_', '/');
base64EncodedText.append((4 - base64EncodedText.size() % 4) % 4, '=');
return base::Base64Decode(base64EncodedText, output);
}
blink::WebCryptoAlgorithm GetInnerHashAlgorithm(
const blink::WebCryptoAlgorithm& algorithm) {
if (algorithm.hmacParams())
return algorithm.hmacParams()->hash();
if (algorithm.hmacKeyParams())
return algorithm.hmacKeyParams()->hash();
if (algorithm.rsaSsaParams())
return algorithm.rsaSsaParams()->hash();
if (algorithm.rsaOaepParams())
return algorithm.rsaOaepParams()->hash();
return blink::WebCryptoAlgorithm::createNull();
}
blink::WebCryptoAlgorithm CreateAlgorithm(blink::WebCryptoAlgorithmId id) {
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(id, NULL);
}
blink::WebCryptoAlgorithm CreateHmacAlgorithmByHashOutputLen(
unsigned short hash_output_length_bits) {
blink::WebCryptoAlgorithmId hash_id;
switch (hash_output_length_bits) {
case 160:
hash_id = blink::WebCryptoAlgorithmIdSha1;
break;
case 224:
hash_id = blink::WebCryptoAlgorithmIdSha224;
break;
case 256:
hash_id = blink::WebCryptoAlgorithmIdSha256;
break;
case 384:
hash_id = blink::WebCryptoAlgorithmIdSha384;
break;
case 512:
hash_id = blink::WebCryptoAlgorithmIdSha512;
break;
default:
NOTREACHED();
return blink::WebCryptoAlgorithm::createNull();
}
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdHmac,
new blink::WebCryptoHmacParams(CreateAlgorithm(hash_id)));
}
blink::WebCryptoAlgorithm CreateHmacAlgorithmByHashId(
blink::WebCryptoAlgorithmId hash_id) {
DCHECK(IsHashAlgorithm(hash_id));
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdHmac,
new blink::WebCryptoHmacParams(CreateAlgorithm(hash_id)));
}
blink::WebCryptoAlgorithm CreateHmacKeyGenAlgorithm(
blink::WebCryptoAlgorithmId hash_id,
unsigned key_length_bytes) {
DCHECK(IsHashAlgorithm(hash_id));
// key_length_bytes == 0 means unspecified
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdHmac,
new blink::WebCryptoHmacKeyParams(
CreateAlgorithm(hash_id), (key_length_bytes != 0), key_length_bytes));
}
blink::WebCryptoAlgorithm CreateRsaSsaAlgorithm(
blink::WebCryptoAlgorithmId hash_id) {
DCHECK(IsHashAlgorithm(hash_id));
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5,
new blink::WebCryptoRsaSsaParams(CreateAlgorithm(hash_id)));
}
blink::WebCryptoAlgorithm CreateRsaOaepAlgorithm(
blink::WebCryptoAlgorithmId hash_id) {
DCHECK(IsHashAlgorithm(hash_id));
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdRsaOaep,
new blink::WebCryptoRsaOaepParams(
CreateAlgorithm(hash_id), false, NULL, 0));
}
blink::WebCryptoAlgorithm CreateRsaKeyGenAlgorithm(
blink::WebCryptoAlgorithmId algorithm_id,
unsigned modulus_length,
const std::vector<uint8>& public_exponent) {
DCHECK(algorithm_id == blink::WebCryptoAlgorithmIdRsaEsPkcs1v1_5 ||
algorithm_id == blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5 ||
algorithm_id == blink::WebCryptoAlgorithmIdRsaOaep);
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
algorithm_id,
new blink::WebCryptoRsaKeyGenParams(
modulus_length,
webcrypto::Uint8VectorStart(public_exponent),
public_exponent.size()));
}
blink::WebCryptoAlgorithm CreateAesCbcAlgorithm(const std::vector<uint8>& iv) {
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdAesCbc,
new blink::WebCryptoAesCbcParams(Uint8VectorStart(iv), iv.size()));
}
blink::WebCryptoAlgorithm CreateAesGcmAlgorithm(
const std::vector<uint8>& iv,
const std::vector<uint8>& additional_data,
uint8 tag_length_bytes) {
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdAesCbc,
new blink::WebCryptoAesGcmParams(Uint8VectorStart(iv),
iv.size(),
additional_data.size() != 0,
Uint8VectorStart(additional_data),
additional_data.size(),
tag_length_bytes != 0,
tag_length_bytes));
}
blink::WebCryptoAlgorithm CreateAesCbcKeyGenAlgorithm(
unsigned short key_length_bits) {
return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesCbc,
key_length_bits);
}
blink::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm(
unsigned short key_length_bits) {
return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesGcm,
key_length_bits);
}
} // namespace webcrypto
} // namespace content
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