[webcrypto] Restrict public exponent for RSA key generation to 3 or 65537.

content/child/webcrypto/platform_crypto.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_PLATFORM_CRYPTO_H_
 #define CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 159 matching lines @@
 //  * public_exponent, modulus_length_bits and hash_or_null are the same as what
 //    is in algorithm. They are split out for convenience.
 //  * modulus_length_bits is not 0
 //  * public_exponent is not empty.
 //  * {public|private}_key_usage_mask make sense for the algorithm.
 Status GenerateRsaKeyPair(const blink::WebCryptoAlgorithm& algorithm,
                           bool extractable,
                           blink::WebCryptoKeyUsageMask public_key_usage_mask,
                           blink::WebCryptoKeyUsageMask private_key_usage_mask,
                           unsigned int modulus_length_bits,
-                          const CryptoData& public_exponent,
+                          unsigned long public_exponent,
                           blink::WebCryptoKey* public_key,
                           blink::WebCryptoKey* private_key);
 
 // Preconditions:
 //  * |key| is non-null.
 //  * |algorithm.id()| is for a symmetric key algorithm.
 //  * For AES algorithms |key_data| is either 16, 24, or 32 bytes long.
 //  * usage_mask makes sense for the algorithm.
 // Note that this may be called from target Blink thread.
 Status ImportKeyRaw(const blink::WebCryptoAlgorithm& algorithm,
@@ skipping 116 matching lines @@
                     const CryptoData& data,
                     std::vector<uint8>* buffer);
 
 }  // namespace platform
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_