[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 {
+
+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* Start(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;
+}
+
+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 CreateAesCbcAlgorithm(const std::vector<uint8>& iv) {
+  return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
+      blink::WebCryptoAlgorithmIdAesCbc,
+      new blink::WebCryptoAesCbcParams(Start(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(Start(iv),
+                                        iv.size(),
+                                        additional_data.size(),
+                                        Start(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 content