[webcrypto] Implement AES-CTR using BoringSSL.

content/child/webcrypto/algorithm_registry.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 "content/child/webcrypto/algorithm_registry.h"
 
 #include "base/lazy_instance.h"
 #include "content/child/webcrypto/algorithm_implementation.h"
 #include "content/child/webcrypto/platform_crypto.h"
 #include "content/child/webcrypto/status.h"
 
 namespace content {
 
 namespace webcrypto {
 
 namespace {
 
 class AlgorithmRegistry {
  public:
   AlgorithmRegistry()
       : sha_(CreatePlatformShaImplementation()),
         aes_gcm_(CreatePlatformAesGcmImplementation()),
         aes_cbc_(CreatePlatformAesCbcImplementation()),
+        aes_ctr_(CreatePlatformAesCtrImplementation()),
         aes_kw_(CreatePlatformAesKwImplementation()),
         hmac_(CreatePlatformHmacImplementation()),
         rsa_ssa_(CreatePlatformRsaSsaImplementation()),
         rsa_oaep_(CreatePlatformRsaOaepImplementation()) {
     PlatformInit();
   }
 
   const AlgorithmImplementation* GetAlgorithm(
       blink::WebCryptoAlgorithmId id) const {
     switch (id) {
       case blink::WebCryptoAlgorithmIdSha1:
       case blink::WebCryptoAlgorithmIdSha256:
       case blink::WebCryptoAlgorithmIdSha384:
       case blink::WebCryptoAlgorithmIdSha512:
         return sha_.get();
       case blink::WebCryptoAlgorithmIdAesGcm:
         return aes_gcm_.get();
       case blink::WebCryptoAlgorithmIdAesCbc:
         return aes_cbc_.get();
+      case blink::WebCryptoAlgorithmIdAesCtr:
+        return aes_ctr_.get();
       case blink::WebCryptoAlgorithmIdAesKw:
         return aes_kw_.get();
       case blink::WebCryptoAlgorithmIdHmac:
         return hmac_.get();
       case blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5:
         return rsa_ssa_.get();
       case blink::WebCryptoAlgorithmIdRsaOaep:
         return rsa_oaep_.get();
       default:
         return NULL;
     }
   }
 
  private:
   scoped_ptr<AlgorithmImplementation> sha_;
   scoped_ptr<AlgorithmImplementation> aes_gcm_;
   scoped_ptr<AlgorithmImplementation> aes_cbc_;
+  scoped_ptr<AlgorithmImplementation> aes_ctr_;
   scoped_ptr<AlgorithmImplementation> aes_kw_;
   scoped_ptr<AlgorithmImplementation> hmac_;
   scoped_ptr<AlgorithmImplementation> rsa_ssa_;
   scoped_ptr<AlgorithmImplementation> rsa_oaep_;
 };
 
 }  // namespace
 
 base::LazyInstance<AlgorithmRegistry>::Leaky g_algorithm_registry =
     LAZY_INSTANCE_INITIALIZER;
 
 Status GetAlgorithmImplementation(blink::WebCryptoAlgorithmId id,
                                   const AlgorithmImplementation** impl) {
   *impl = g_algorithm_registry.Get().GetAlgorithm(id);
   if (*impl)
     return Status::Success();
   return Status::ErrorUnsupported();
 }
 
 }  // namespace webcrypto
 
 }  // namespace content