Refactor WebCrypto code

content/child/webcrypto/algorithm_dispatch.h

 // 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.
 
-#ifndef CONTENT_CHILD_WEBCRYPTO_SHARED_CRYPTO_H_
-#define CONTENT_CHILD_WEBCRYPTO_SHARED_CRYPTO_H_
+#ifndef CONTENT_CHILD_WEBCRYPTO_ALGORITHM_DISPATCH_H_
+#define CONTENT_CHILD_WEBCRYPTO_ALGORITHM_DISPATCH_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
-#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace content {
 
 namespace webcrypto {
 
+class AlgorithmImplementation;
 class CryptoData;
 class Status;
 
-// Do one-time initialization. It is safe to call this multiple times.
-// May be called concurrently from multiple threads.
-CONTENT_EXPORT void Init();
-
-// The functions exported by shared_crypto.h provide a common entry point for
-// synchronous crypto operations.
+// These functions provide an entry point for synchronous webcrypto operations.
 //
-// Here is how the layer cake looks.
+// The inputs to these methods come from Blink, and hence the validations done
+// by Blink can be assumed:
 //
-//              Blink
-//                |
-//  ==============|==========================
-//                |
-//             content
-//                |
-//                |
-//                v
-//          WebCryptoImpl     (Implements the blink::WebCrypto interface for
-//                |            asynchronous completions; posts tasks to
-//                |            the webcrypto worker pool to fulfill the request
-//                             using the synchronous methods of shared_crypto.h)
-//                |
-//                |      [shared_crypto_unittest.cc]
-//                |           /
-//                |          /   (The blink::WebCrypto interface is not
-//                |         /     testable from the chromium side because
-//                |        /      the result object is not mockable.
-//                |       /       Tests are done on shared_crypto instead.
-//                V      v
-//        [shared_crypto.h]   (Exposes synchronous functions in the
-//                |            webcrypto:: namespace. This does
-//                |            common validations, infers default
-//                |            parameters, and casts the algorithm
-//                |            parameters to the right types)
-//                |
-//                V
-//       [platform_crypto.h]  (Exposes functions in the webcrypto::platform
-//                |            namespace)
-//                |
-//                |
-//                V
-//  [platform_crypto_{nss|openssl}.cc]  (Implements using the platform crypto
-//                                       library)
-//
-// The shared_crypto.h functions are responsible for:
-//
-//  * Validating the key usages
-//  * Inferring default parameters when not specified
-//  * Validating key exportability
-//  * Validating algorithm with key.algorithm
-//  * Converting the Blink key to a more specific platform::{PublicKey,
-//    PrivateKey, SymKey} and making sure it was the right type.
-//  * Validating alogorithm specific parameters (for instance, was the iv for
-//    AES-CBC 16 bytes).
-//  * Parse a JWK
+//   * The algorithm parameters are consistent with the algorithm
+//   * The key contains the required usage for the operation
 
 CONTENT_EXPORT Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
                               const blink::WebCryptoKey& key,
                               const CryptoData& data,
                               std::vector<uint8>* buffer);
 
 CONTENT_EXPORT Status Decrypt(const blink::WebCryptoAlgorithm& algorithm,
                               const blink::WebCryptoKey& key,
                               const CryptoData& data,
                               std::vector<uint8>* buffer);
 
 CONTENT_EXPORT Status Digest(const blink::WebCryptoAlgorithm& algorithm,
                              const CryptoData& data,
                              std::vector<uint8>* buffer);
 
-CONTENT_EXPORT scoped_ptr<blink::WebCryptoDigestor> CreateDigestor(
-    blink::WebCryptoAlgorithmId algorithm);
-
 CONTENT_EXPORT Status
     GenerateSecretKey(const blink::WebCryptoAlgorithm& algorithm,
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usage_mask,
                       blink::WebCryptoKey* key);
 
 CONTENT_EXPORT Status
     GenerateKeyPair(const blink::WebCryptoAlgorithm& algorithm,
                     bool extractable,
                     blink::WebCryptoKeyUsageMask usage_mask,
                     blink::WebCryptoKey* public_key,
                     blink::WebCryptoKey* private_key);
 
 CONTENT_EXPORT Status ImportKey(blink::WebCryptoKeyFormat format,
                                 const CryptoData& key_data,
                                 const blink::WebCryptoAlgorithm& algorithm,
                                 bool extractable,
                                 blink::WebCryptoKeyUsageMask usage_mask,
                                 blink::WebCryptoKey* key);
 
 CONTENT_EXPORT Status ExportKey(blink::WebCryptoKeyFormat format,
                                 const blink::WebCryptoKey& key,
                                 std::vector<uint8>* buffer);
 
 CONTENT_EXPORT Status Sign(const blink::WebCryptoAlgorithm& algorithm,
                            const blink::WebCryptoKey& key,
                            const CryptoData& data,
                            std::vector<uint8>* buffer);
 
-CONTENT_EXPORT Status
-    VerifySignature(const blink::WebCryptoAlgorithm& algorithm,
-                    const blink::WebCryptoKey& key,
-                    const CryptoData& signature,
-                    const CryptoData& data,
-                    bool* signature_match);
+CONTENT_EXPORT Status Verify(const blink::WebCryptoAlgorithm& algorithm,
+                             const blink::WebCryptoKey& key,
+                             const CryptoData& signature,
+                             const CryptoData& data,
+                             bool* signature_match);
 
 CONTENT_EXPORT Status
     WrapKey(blink::WebCryptoKeyFormat format,
             const blink::WebCryptoKey& key_to_wrap,
             const blink::WebCryptoKey& wrapping_key,
             const blink::WebCryptoAlgorithm& wrapping_algorithm,
             std::vector<uint8>* buffer);
 
 CONTENT_EXPORT Status
     UnwrapKey(blink::WebCryptoKeyFormat format,
               const CryptoData& wrapped_key_data,
               const blink::WebCryptoKey& wrapping_key,
               const blink::WebCryptoAlgorithm& wrapping_algorithm,
               const blink::WebCryptoAlgorithm& algorithm,
               bool extractable,
               blink::WebCryptoKeyUsageMask usage_mask,
               blink::WebCryptoKey* key);
 
-// Called on the target Blink thread.
-CONTENT_EXPORT bool SerializeKeyForClone(const blink::WebCryptoKey& key,
-                                         blink::WebVector<uint8>* key_data);
-
-// Called on the target Blink thread.
-CONTENT_EXPORT bool DeserializeKeyForClone(
-    const blink::WebCryptoKeyAlgorithm& algorithm,
-    blink::WebCryptoKeyType type,
-    bool extractable,
-    blink::WebCryptoKeyUsageMask usage_mask,
-    const CryptoData& key_data,
-    blink::WebCryptoKey* key);
-
-namespace platform {
-class SymKey;
-class PublicKey;
-class PrivateKey;
-}
-
-Status ToPlatformSymKey(const blink::WebCryptoKey& key, platform::SymKey** out);
-
-Status ToPlatformPublicKey(const blink::WebCryptoKey& key,
-                           platform::PublicKey** out);
-
-Status ToPlatformPrivateKey(const blink::WebCryptoKey& key,
-                            platform::PrivateKey** out);
-
-// Returns Staus::Success() if |usages| is valid for |key_type| and |algorithm|.
-// Otherwise returns a failure
-Status CheckKeyUsages(blink::WebCryptoAlgorithmId algorithm,
-                      blink::WebCryptoKeyType key_type,
-                      blink::WebCryptoKeyUsageMask usages);
+CONTENT_EXPORT scoped_ptr<blink::WebCryptoDigestor> CreateDigestor(
+    blink::WebCryptoAlgorithmId algorithm);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
-#endif  // CONTENT_CHILD_WEBCRYPTO_SHARED_CRYPTO_H_
+#endif  // CONTENT_CHILD_WEBCRYPTO_ALGORITHM_DISPATCH_H_