[webcrypto] Implement AES-CTR using BoringSSL.

content/child/webcrypto/openssl/aes_cbc_openssl.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 <openssl/aes.h>
 #include <openssl/evp.h>
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "base/stl_util.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/openssl/aes_key_openssl.h"
 #include "content/child/webcrypto/openssl/key_openssl.h"
+#include "content/child/webcrypto/openssl/util_openssl.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/webcrypto_util.h"
 #include "crypto/openssl_util.h"
 #include "crypto/scoped_openssl_types.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace content {
 
 namespace webcrypto {
 
 namespace {
 
 const EVP_CIPHER* GetAESCipherByKeyLength(unsigned int key_length_bytes) {
   // BoringSSL does not support 192-bit AES keys.
   switch (key_length_bytes) {
     case 16:
       return EVP_aes_128_cbc();
     case 32:
       return EVP_aes_256_cbc();
     default:
       return NULL;
   }
 }
 
-// OpenSSL constants for EVP_CipherInit_ex(), do not change
-enum CipherOperation { kDoDecrypt = 0, kDoEncrypt = 1 };
-
-Status AesCbcEncryptDecrypt(CipherOperation cipher_operation,
+Status AesCbcEncryptDecrypt(EncryptOrDecrypt cipher_operation,
                             const blink::WebCryptoAlgorithm& algorithm,
                             const blink::WebCryptoKey& key,
                             const CryptoData& data,
                             std::vector<uint8_t>* buffer) {
   crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
 
   const blink::WebCryptoAesCbcParams* params = algorithm.aesCbcParams();
   const std::vector<uint8_t>& raw_key =
       SymKeyOpenSsl::Cast(key)->raw_key_data();
 
@@ skipping 60 matching lines @@
 }
 
 class AesCbcImplementation : public AesAlgorithm {
  public:
   AesCbcImplementation() : AesAlgorithm("CBC") {}
 
   virtual Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
                          const blink::WebCryptoKey& key,
                          const CryptoData& data,
                          std::vector<uint8_t>* buffer) const OVERRIDE {
-    return AesCbcEncryptDecrypt(kDoEncrypt, algorithm, key, data, buffer);
+    return AesCbcEncryptDecrypt(ENCRYPT, algorithm, key, data, buffer);
   }
 
   virtual Status Decrypt(const blink::WebCryptoAlgorithm& algorithm,
                          const blink::WebCryptoKey& key,
                          const CryptoData& data,
                          std::vector<uint8_t>* buffer) const OVERRIDE {
-    return AesCbcEncryptDecrypt(kDoDecrypt, algorithm, key, data, buffer);
+    return AesCbcEncryptDecrypt(DECRYPT, algorithm, key, data, buffer);
   }
 };
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesCbcImplementation() {
   return new AesCbcImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content