Implement RSAPrivateKey::Copy()

crypto/rsa_private_key_openssl.cc

Index: crypto/rsa_private_key_openssl.cc
diff --git a/crypto/rsa_private_key_openssl.cc b/crypto/rsa_private_key_openssl.cc
index 63efb9c4f875e2e50b85ded1c7ed2664bca0aff7..5cfdcd3ce0b1040623e0ba7e19022b9df15d6706 100644
--- a/crypto/rsa_private_key_openssl.cc
+++ b/crypto/rsa_private_key_openssl.cc
@@ -124,6 +124,17 @@ RSAPrivateKey::~RSAPrivateKey() {
     EVP_PKEY_free(key_);
 }
 
+RSAPrivateKey* RSAPrivateKey::Copy() const {
+  scoped_ptr<RSAPrivateKey> copy(new RSAPrivateKey());
+  RSA* rsa = EVP_PKEY_get1_RSA(key_);
+  if (!rsa)
+    return NULL;
+  copy->key_ = EVP_PKEY_new();
+  if (!EVP_PKEY_set1_RSA(copy->key_, rsa))
+    return NULL;
+  return copy.release();
+}
+
 bool RSAPrivateKey::ExportPrivateKey(std::vector<uint8>* output) {
   return ExportKey(key_, i2d_PKCS8PrivateKeyInfo_bio, output);
 }