Implement RSAPrivateKey::Copy()

crypto/rsa_private_key.h

Index: crypto/rsa_private_key.h
diff --git a/crypto/rsa_private_key.h b/crypto/rsa_private_key.h
index 6b9d9d6800a07f6d3add3d3557cce305fba40690..4262a8d66d7dddfeea2463902bd35552243195f5 100644
--- a/crypto/rsa_private_key.h
+++ b/crypto/rsa_private_key.h
@@ -223,11 +223,14 @@ class CRYPTO_EXPORT RSAPrivateKey {
   CSSM_KEY_PTR public_key() { return &public_key_; }
 #endif
 
+  // Creates a copy of the object.
+  RSAPrivateKey* Copy() const;
+
   // Exports the private key to a PKCS #1 PrivateKey block.
-  bool ExportPrivateKey(std::vector<uint8>* output);
+  bool ExportPrivateKey(std::vector<uint8>* output) const;
 
   // Exports the public key to an X509 SubjectPublicKeyInfo block.
-  bool ExportPublicKey(std::vector<uint8>* output);
+  bool ExportPublicKey(std::vector<uint8>* output) const;
 
  private:
 #if defined(USE_NSS)