crypto/signature_creator_openssl.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "crypto/signature_creator.h"
   6
   7 #include <openssl/evp.h>
   8
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/stl_util.h"
  12 #include "crypto/openssl_util.h"
  13
  14 namespace crypto {
  15
  16 // static
  17 SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
  18   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  19   scoped_ptr<SignatureCreator> result(new SignatureCreator);
  20   result->key_ = key;
  21   if (!EVP_SignInit_ex(result->sign_context_, EVP_sha1(), NULL))
  22     return NULL;
  23   return result.release();
  24 }
  25
  26 SignatureCreator::SignatureCreator()
  27     : sign_context_(EVP_MD_CTX_create()) {
  28 }
  29
  30 SignatureCreator::~SignatureCreator() {
  31   EVP_MD_CTX_destroy(sign_context_);
  32 }
  33
  34 bool SignatureCreator::Update(const uint8* data_part, int data_part_len) {
  35   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  36   return EVP_SignUpdate(sign_context_, data_part, data_part_len) == 1;
  37 }
  38
  39 bool SignatureCreator::Final(std::vector<uint8>* signature) {
  40   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  41   EVP_PKEY* key = key_->key();
  42   signature->resize(EVP_PKEY_size(key));
  43
  44   unsigned int len = 0;
  45   int rv = EVP_SignFinal(sign_context_, vector_as_array(signature), &len, key);
  46   if (!rv) {
  47     signature->clear();
  48     return false;
  49   }
  50   signature->resize(len);
  51   return true;
  52 }
  53
  54 }  // namespace crypto