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

content/child/webcrypto/webcrypto_util.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_WEBCRYPTO_UTIL_H_
 #define CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_UTIL_H_
 
 #include <string>
 #include <vector>
 #include "base/basictypes.h"
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 // Creates a WebCryptoAlgorithm without any parameters.
 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateAlgorithm(
     blink::WebCryptoAlgorithmId id);
 
 // Creates an HMAC import algorithm whose inner hash algorithm is determined by
 // the specified algorithm ID. It is an error to call this method with a hash
 // algorithm that is not SHA*.
 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateHmacImportAlgorithm(
     blink::WebCryptoAlgorithmId hash_id);
 
+// Creates an import algorithm for RSA algorithms that take a hash.
+// It is an error to call this with a hash_id that is not a SHA*.
+CONTENT_EXPORT blink::WebCryptoAlgorithm CreateRsaHashedImportAlgorithm(
+    blink::WebCryptoAlgorithmId id,
+    blink::WebCryptoAlgorithmId hash_id);
+
+// TODO(eroman): Move these to jwk.cc
 // Creates an RSASSA-PKCS1-v1_5 algorithm. It is an error to call this with a
 // hash_id that is not a SHA*.
 blink::WebCryptoAlgorithm CreateRsaSsaImportAlgorithm(
     blink::WebCryptoAlgorithmId hash_id);
 
 // Creates an RSA-OAEP algorithm. It is an error to call this with a hash_id
 // that is not a SHA*.
 blink::WebCryptoAlgorithm CreateRsaOaepImportAlgorithm(
     blink::WebCryptoAlgorithmId hash_id);
 
 // TODO(eroman): Move to shared_crypto.cc
 // Returns the internal block size for SHA-*
 unsigned int ShaBlockSizeBytes(blink::WebCryptoAlgorithmId hash_id);
 
 bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
                               unsigned keylen_bytes,
                               blink::WebCryptoKeyAlgorithm* key_algorithm);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_UTIL_H_