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

content/child/webcrypto/platform_crypto_openssl.cc

 // 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.
 
 #include "content/child/webcrypto/platform_crypto.h"
 
 #include <vector>
 #include <openssl/aes.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
@@ skipping 285 matching lines @@
                                      usage_mask);
 
   return Status::Success();
 }
 
 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) {
   // TODO(padolph): Placeholder for OpenSSL implementation.
   // Issue http://crbug.com/267888.
   return Status::ErrorUnsupported();
 }
 
 Status ImportKeyRaw(const blink::WebCryptoAlgorithm& algorithm,
                     const CryptoData& key_data,
                     bool extractable,
@@ skipping 210 matching lines @@
     blink::WebCryptoKey* key) {
   // TODO(eroman): http://crbug.com/267888
   return false;
 }
 
 }  // namespace platform
 
 }  // namespace webcrypto
 
 }  // namespace content