Allow a crypto::RSAPrivateKey object to be wrapped round a pre-existing

crypto/rsa_private_key_openssl.cc

 // 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.
 
 #include "crypto/rsa_private_key.h"
 
 #include <openssl/bio.h>
 #include <openssl/bn.h>
 #include <openssl/evp.h>
 #include <openssl/pkcs12.h>
@@ skipping 80 matching lines @@
     return NULL;
 
   scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
   result->key_ = EVP_PKCS82PKEY(p8inf.get());
   if (!result->key_)
     return NULL;
 
   return result.release();
 }
 
+// static
+RSAPrivateKey* RSAPrivateKey::CreateFromKey(EVP_PKEY* key) {
+  DCHECK(key);
+  if (EVP_PKEY_type(key->type) != EVP_PKEY_RSA)
+    return NULL;
+  RSAPrivateKey* copy = new RSAPrivateKey();
+  copy->key_ = EVP_PKEY_dup(key);
+  return copy;
+}
+
 RSAPrivateKey::RSAPrivateKey()
     : key_(NULL) {
 }
 
 RSAPrivateKey::~RSAPrivateKey() {
   if (key_)
     EVP_PKEY_free(key_);
 }
 
 RSAPrivateKey* RSAPrivateKey::Copy() const {
   scoped_ptr<RSAPrivateKey> copy(new RSAPrivateKey());
   ScopedRSA rsa(EVP_PKEY_get1_RSA(key_));
   if (!rsa)
     return NULL;
   copy->key_ = EVP_PKEY_new();
   if (!EVP_PKEY_set1_RSA(copy->key_, rsa.get()))
     return NULL;
   return copy.release();
 }
 
 bool RSAPrivateKey::ExportPrivateKey(std::vector<uint8>* output) const {
   return ExportKey(key_, i2d_PKCS8PrivateKeyInfo_bio, output);
 }
 
 bool RSAPrivateKey::ExportPublicKey(std::vector<uint8>* output) const {
   return ExportKey(key_, i2d_PUBKEY_bio, output);
 }
 
 }  // namespace crypto