crypto/signature_creator_openssl.cc

   1 // Copyright (c) 2012 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 #include "crypto/rsa_private_key.h"
  14
  15 namespace crypto {
  16
  17 // static
  18 SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
  19   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  20   scoped_ptr<SignatureCreator> result(new SignatureCreator);
  21   result->key_ = key;
  22   if (!EVP_SignInit_ex(result->sign_context_, EVP_sha1(), NULL))
  23     return NULL;
  24   return result.release();
  25 }
  26
  27 SignatureCreator::SignatureCreator()
  28     : sign_context_(EVP_MD_CTX_create()) {
  29 }
  30
  31 SignatureCreator::~SignatureCreator() {
  32   EVP_MD_CTX_destroy(sign_context_);
  33 }
  34
  35 bool SignatureCreator::Update(const uint8* data_part, int data_part_len) {
  36   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  37   return EVP_SignUpdate(sign_context_, data_part, data_part_len) == 1;
  38 }
  39
  40 bool SignatureCreator::Final(std::vector<uint8>* signature) {
  41   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  42   EVP_PKEY* key = key_->key();
  43   signature->resize(EVP_PKEY_size(key));
  44
  45   unsigned int len = 0;
  46   int rv = EVP_SignFinal(sign_context_, vector_as_array(signature), &len, key);
  47   if (!rv) {
  48     signature->clear();
  49     return false;
  50   }
  51   signature->resize(len);
  52   return true;
  53 }
  54
  55 }  // namespace crypto