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// Copyright (c) 2012 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/signature_creator.h"
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "crypto/openssl_util.h"
#include "crypto/rsa_private_key.h"
#include "crypto/scoped_openssl_types.h"
namespace crypto {
// static
SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
scoped_ptr<SignatureCreator> result(new SignatureCreator);
result->key_ = key;
if (!EVP_SignInit_ex(result->sign_context_, EVP_sha1(), NULL))
return NULL;
return result.release();
}
// static
bool SignatureCreator::Sign(RSAPrivateKey* key,
const uint8* data,
int data_len,
std::vector<uint8>* signature) {
ScopedRSA rsa_key(EVP_PKEY_get1_RSA(key->key()));
if (!rsa_key)
return false;
signature->resize(RSA_size(rsa_key.get()));
unsigned int len = 0;
bool success = RSA_sign(NID_sha1, data, data_len, vector_as_array(signature),
&len, rsa_key.get());
if (!success) {
signature->clear();
return false;
}
signature->resize(len);
return true;
}
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) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
return EVP_SignUpdate(sign_context_, data_part, data_part_len) == 1;
}
bool SignatureCreator::Final(std::vector<uint8>* signature) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
EVP_PKEY* key = key_->key();
signature->resize(EVP_PKEY_size(key));
unsigned int len = 0;
int rv = EVP_SignFinal(sign_context_, vector_as_array(signature), &len, key);
if (!rv) {
signature->clear();
return false;
}
signature->resize(len);
return true;
}
} // namespace crypto
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