[webcrypto] Implement structured clone of keys (blink-side).

public/platform/WebCryptoAlgorithm.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     WebCryptoAlgorithmIdSha1,
     WebCryptoAlgorithmIdSha224, // FIXME: Delete once no longer referenced by chromium.
     WebCryptoAlgorithmIdSha256,
     WebCryptoAlgorithmIdSha384,
     WebCryptoAlgorithmIdSha512,
     WebCryptoAlgorithmIdAesGcm,
     WebCryptoAlgorithmIdRsaOaep,
     WebCryptoAlgorithmIdAesCtr,
     WebCryptoAlgorithmIdAesKw,
 #if INSIDE_BLINK
-    NumberOfWebCryptoAlgorithmId,
+    WebCryptoAlgorithmIdLast = WebCryptoAlgorithmIdAesKw,
 #endif
 };
 
 enum WebCryptoAlgorithmParamsType {
     WebCryptoAlgorithmParamsTypeNone,
     WebCryptoAlgorithmParamsTypeAesCbcParams,
     WebCryptoAlgorithmParamsTypeAesKeyGenParams,
     WebCryptoAlgorithmParamsTypeHmacImportParams,
     WebCryptoAlgorithmParamsTypeHmacKeyGenParams,
     WebCryptoAlgorithmParamsTypeRsaKeyGenParams,
@@ skipping 56 matching lines @@
     BLINK_PLATFORM_EXPORT const WebCryptoAesKeyGenParams* aesKeyGenParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoHmacImportParams* hmacImportParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoHmacKeyGenParams* hmacKeyGenParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoRsaKeyGenParams* rsaKeyGenParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoAesGcmParams* aesGcmParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoRsaOaepParams* rsaOaepParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoAesCtrParams* aesCtrParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoRsaHashedImportParams* rsaHashedImportParams() const;
     BLINK_PLATFORM_EXPORT const WebCryptoRsaHashedKeyGenParams* rsaHashedKeyGenParams() const;
 
+    // Returns true if the provided algorithm ID is for a hash (in other words, SHA-*)
+    BLINK_PLATFORM_EXPORT static bool isHash(WebCryptoAlgorithmId);
+
 private:
     BLINK_PLATFORM_EXPORT void assign(const WebCryptoAlgorithm& other);
     BLINK_PLATFORM_EXPORT void reset();
 
     WebPrivatePtr<WebCryptoAlgorithmPrivate> m_private;
 };
 
 } // namespace blink
 
 #endif