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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 "crypto/openssl_util.h"
#include "crypto/rsa_private_key.h"
#include "crypto/scoped_openssl_types.h"
namespace crypto {
namespace {
const EVP_MD* ToOpenSSLDigest(SignatureCreator::HashAlgorithm hash_alg) {
switch (hash_alg) {
case SignatureCreator::SHA1:
return EVP_sha1();
case SignatureCreator::SHA256:
return EVP_sha256();
}
return NULL;
}
int ToOpenSSLDigestType(SignatureCreator::HashAlgorithm hash_alg) {
switch (hash_alg) {
case SignatureCreator::SHA1:
return NID_sha1;
case SignatureCreator::SHA256:
return NID_sha256;
}
return NID_undef;
}
} // namespace
// static
SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key,
HashAlgorithm hash_alg) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
scoped_ptr<SignatureCreator> result(new SignatureCreator);
const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
DCHECK(digest);
if (!digest) {
return NULL;
}
if (!EVP_DigestSignInit(result->sign_context_, NULL, digest, NULL,
key->key())) {
return NULL;
}
return result.release();
}
// static
bool SignatureCreator::Sign(RSAPrivateKey* key,
HashAlgorithm hash_alg,
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;
if (!RSA_sign(ToOpenSSLDigestType(hash_alg), data, data_len,
signature->data(), &len, rsa_key.get())) {
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_DigestSignUpdate(sign_context_, data_part, data_part_len);
}
bool SignatureCreator::Final(std::vector<uint8>* signature) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
// Determine the maximum length of the signature.
size_t len = 0;
if (!EVP_DigestSignFinal(sign_context_, NULL, &len)) {
signature->clear();
return false;
}
signature->resize(len);
// Sign it.
if (!EVP_DigestSignFinal(sign_context_, signature->data(), &len)) {
signature->clear();
return false;
}
signature->resize(len);
return true;
}
} // namespace crypto
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