[webcrypto] Add JWK import for HMAC and AES-CBC key.

content/renderer/webcrypto/webcrypto_util.cc

+// 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_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 {
+
+WebKit::WebCryptoAlgorithm CreateAesKeyGenAlgorithm(
+    WebKit::WebCryptoAlgorithmId aes_alg_id,
+    unsigned short length) {
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(
+      aes_alg_id, new WebKit::WebCryptoAesKeyGenParams(length));
+}
+
+}  // namespace
+
+const uint8* Start(const std::vector<uint8>& data) {
+  if (data.empty())
+    return NULL;
+  return &data[0];
+}
+
+void 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;
+}
+
+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);
+}
+
+WebKit::WebCryptoAlgorithm GetInnerHashAlgorithm(
+    const WebKit::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 WebKit::WebCryptoAlgorithm::createNull();
+}
+
+WebKit::WebCryptoAlgorithm CreateAlgorithm(WebKit::WebCryptoAlgorithmId id) {
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(id, NULL);
+}
+
+WebKit::WebCryptoAlgorithm CreateHmacAlgorithmByDigestLen(
+    unsigned short digest_length_bits) {
+  WebKit::WebCryptoAlgorithmId hash_id;
+  switch (digest_length_bits) {
+    case 160:
+      hash_id = WebKit::WebCryptoAlgorithmIdSha1;
+      break;
+    case 224:
+      hash_id = WebKit::WebCryptoAlgorithmIdSha224;
+      break;
+    case 256:
+      hash_id = WebKit::WebCryptoAlgorithmIdSha256;
+      break;
+    case 384:
+      hash_id = WebKit::WebCryptoAlgorithmIdSha384;
+      break;
+    case 512:
+      hash_id = WebKit::WebCryptoAlgorithmIdSha512;
+      break;
+    default:
+      NOTREACHED();
+      return WebKit::WebCryptoAlgorithm::createNull();
+  }
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(
+      WebKit::WebCryptoAlgorithmIdHmac,
+      new WebKit::WebCryptoHmacParams(CreateAlgorithm(hash_id)));
+}
+
+WebKit::WebCryptoAlgorithm CreateHmacAlgorithmByHashId(
+    WebKit::WebCryptoAlgorithmId hash_id) {
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(

[eroman, 2013/11/07 20:54:37]

[optional] I propose adding DCHECK(IsHashAlgorithm(hash_id));

[padolph, 2013/11/09 00:33:38]

Done.

+      WebKit::WebCryptoAlgorithmIdHmac,
+      new WebKit::WebCryptoHmacParams(CreateAlgorithm(hash_id)));
+}
+
+WebKit::WebCryptoAlgorithm CreateHmacKeyGenAlgorithm(
+    WebKit::WebCryptoAlgorithmId hash_id,
+    unsigned hash_length) {
+  // hash_length < 0 means unspecified
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(

[eroman, 2013/11/07 20:54:37]

[optional] I propose adding DCHECK(IsHashAlgorithm(hash_id));

[padolph, 2013/11/09 00:33:38]

Done.

+      WebKit::WebCryptoAlgorithmIdHmac,
+      new WebKit::WebCryptoHmacKeyParams(
+          CreateAlgorithm(hash_id), (hash_length != 0), hash_length));

[eroman, 2013/11/07 20:54:37]

'hash_length" isn't the right name, this is more like key_length_bytes

[padolph, 2013/11/09 00:33:38]

Done.

+}
+
+WebKit::WebCryptoAlgorithm CreateRsaSsaAlgorithm(
+    WebKit::WebCryptoAlgorithmId hash_algorithm_id) {

[eroman, 2013/11/07 20:54:37]

hash_id

[padolph, 2013/11/09 00:33:38]

Done.

+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(

[eroman, 2013/11/07 20:54:37]

[optional] I propose adding DCHECK(IsHashAlgorithm(hash_id));

[padolph, 2013/11/09 00:33:38]

Done.

+      WebKit::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5,
+      new WebKit::WebCryptoRsaSsaParams(CreateAlgorithm(hash_algorithm_id)));
+}
+
+WebKit::WebCryptoAlgorithm CreateRsaOaepAlgorithm(
+    WebKit::WebCryptoAlgorithmId hash_algorithm_id) {

[eroman, 2013/11/07 20:54:37]

hash_id

[padolph, 2013/11/09 00:33:38]

Done.

+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(

[eroman, 2013/11/07 20:54:37]

[optional] I propose adding DCHECK(IsHashAlgorithm(hash_id));

[padolph, 2013/11/09 00:33:38]

Done.

+      WebKit::WebCryptoAlgorithmIdRsaOaep,
+      new WebKit::WebCryptoRsaOaepParams(
+          CreateAlgorithm(hash_algorithm_id), false, NULL, 0));
+}
+
+WebKit::WebCryptoAlgorithm CreateAesCbcAlgorithm(const std::vector<uint8>& iv) {
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(
+      WebKit::WebCryptoAlgorithmIdAesCbc,
+      new WebKit::WebCryptoAesCbcParams(Start(iv), iv.size()));
+}
+
+WebKit::WebCryptoAlgorithm CreateAesGcmAlgorithm(
+    const std::vector<uint8>& iv,
+    const std::vector<uint8>& additional_data,
+    unsigned char tag_length) {
+  return WebKit::WebCryptoAlgorithm::adoptParamsAndCreate(
+      WebKit::WebCryptoAlgorithmIdAesCbc,
+      new WebKit::WebCryptoAesGcmParams(Start(iv),
+                                        iv.size(),
+                                        additional_data.size(),
+                                        Start(additional_data),
+                                        additional_data.size(),
+                                        tag_length != 0,
+                                        tag_length));
+}
+
+WebKit::WebCryptoAlgorithm CreateAesCbcKeyGenAlgorithm(unsigned short length) {
+  return CreateAesKeyGenAlgorithm(WebKit::WebCryptoAlgorithmIdAesCbc, length);
+}
+
+WebKit::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm(unsigned short length) {
+  return CreateAesKeyGenAlgorithm(WebKit::WebCryptoAlgorithmIdAesGcm, length);
+}
+
+}  // namespace content