NSS Channel ID: don't check ECC support on every socket creation.

crypto/ec_private_key.h

 // Copyright (c) 2011 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 CRYPTO_EC_PRIVATE_KEY_H_
 #define CRYPTO_EC_PRIVATE_KEY_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
 
 // Encapsulates an elliptic curve (EC) private key. Can be used to generate new
 // keys, export keys to other formats, or to extract a public key.
 // TODO(mattm): make this and RSAPrivateKey implement some PrivateKey interface.
 // (The difference in types of key() and public_key() make this a little
 // tricky.)
 class CRYPTO_EXPORT ECPrivateKey {
  public:
   ~ECPrivateKey();
 
+  // Returns whether the system supports elliptic curve cryptography.
+  static bool IsSupported();
+
   // Creates a new random instance. Can return NULL if initialization fails.
   // The created key will use the NIST P-256 curve.
   // TODO(mattm): Add a curve parameter.
   static ECPrivateKey* Create();
 
   // Creates a new random instance. Can return NULL if initialization fails.
   // The created key is permanent and is not exportable in plaintext form.
   //
   // NOTE: Currently only available if USE_NSS is defined.
   static ECPrivateKey* CreateSensitive();
@@ skipping 85 matching lines @@
   SECKEYPublicKey* public_key_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ECPrivateKey);
 };
 
 
 }  // namespace crypto
 
 #endif  // CRYPTO_EC_PRIVATE_KEY_H_