Refactor WebCrypto code

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"
@@ skipping 49 matching lines @@
 // 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);
 
-bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
-                              unsigned int keylen_bytes,
-                              blink::WebCryptoKeyAlgorithm* key_algorithm);
-
 // Returns true if the set bits in b make up a subset of the set bits in a.
 bool ContainsKeyUsages(blink::WebCryptoKeyUsageMask a,
                        blink::WebCryptoKeyUsageMask b);
 
+bool KeyUsageAllows(const blink::WebCryptoKey& key,
+                    const blink::WebCryptoKeyUsage usage);
+
 bool IsAlgorithmRsa(blink::WebCryptoAlgorithmId alg_id);
 bool IsAlgorithmAsymmetric(blink::WebCryptoAlgorithmId alg_id);
 
+Status GetAesGcmTagLengthInBits(const blink::WebCryptoAesGcmParams* params,
+                                unsigned int* tag_length_bits);
+
+Status GetAesKeyGenLengthInBits(const blink::WebCryptoAesKeyGenParams* params,
+                                unsigned int* keylen_bits);
+
+Status GetHmacKeyGenLengthInBits(const blink::WebCryptoHmacKeyGenParams* params,
+                                 unsigned int* keylen_bits);
+
+Status VerifyAesKeyLengthForImport(unsigned int keylen_bytes);
+
+Status CheckKeyCreationUsages(blink::WebCryptoKeyUsageMask all_possible_usages,
+                              blink::WebCryptoKeyUsageMask actual_usages);
+
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_UTIL_H_