Implements Signature Creator & Verifier for openssl

base/crypto/signature_creator_openssl.cc

 // Copyright (c) 2009 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 "base/crypto/signature_creator.h"
 
+#include <openssl/evp.h>
+
 #include "base/logging.h"
+#include "base/openssl_util.h"
+#include "base/scoped_ptr.h"
 
 namespace base {
 
 // static
 SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
-  return NULL;
+  EnsureOpenSSLInit();
+  OpenSSLErrStackTracer err_tracer("SignatureCreator::Create");
+  scoped_ptr<SignatureCreator> result(new SignatureCreator);
+  result->key_ = key;
+  if (!EVP_SignInit_ex(result->sign_context_, EVP_sha1(), NULL))
+    return NULL;
+  return result.release();
 }
 
-SignatureCreator::SignatureCreator() {
+SignatureCreator::SignatureCreator()
+    : sign_context_(EVP_MD_CTX_create()) {
 }
 
 SignatureCreator::~SignatureCreator() {
+  EVP_MD_CTX_destroy(sign_context_);
 }
 
 bool SignatureCreator::Update(const uint8* data_part, int data_part_len) {
-  NOTIMPLEMENTED();
-  return false;
+  OpenSSLErrStackTracer err_tracer("SignatureCreator::Update");
+  return EVP_SignUpdate(sign_context_, data_part, data_part_len) == 1;
 }
 
 bool SignatureCreator::Final(std::vector<uint8>* signature) {
-  NOTIMPLEMENTED();
-  return false;
+  OpenSSLErrStackTracer err_tracer("SignatureCreator::Final");
+  EVP_PKEY* key = key_->key();
+  signature->resize(EVP_PKEY_size(key));
+
+  unsigned int len = 0;
+  int rv = EVP_SignFinal(sign_context_, signature->data(), &len, key);
+  if (!rv) {
+    signature->clear();
+    return false;
+  }
+  signature->resize(len);
+  return true;
 }
 
 }  // namespace base