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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "crypto/signature_creator.h"
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#include <stddef.h>
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#include <stdint.h>
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#include "base/logging.h"
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#include "crypto/openssl_util.h"
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#include "crypto/rsa_private_key.h"
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#include "third_party/boringssl/src/include/openssl/evp.h"
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#include "third_party/boringssl/src/include/openssl/rsa.h"
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namespace crypto {
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namespace {
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const EVP_MD* ToOpenSSLDigest(SignatureCreator::HashAlgorithm hash_alg) {
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switch (hash_alg) {
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case SignatureCreator::SHA1:
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return EVP_sha1();
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case SignatureCreator::SHA256:
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return EVP_sha256();
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}
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return nullptr;
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}
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int ToOpenSSLDigestType(SignatureCreator::HashAlgorithm hash_alg) {
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switch (hash_alg) {
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case SignatureCreator::SHA1:
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return NID_sha1;
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case SignatureCreator::SHA256:
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return NID_sha256;
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}
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return NID_undef;
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}
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} // namespace
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SignatureCreator::~SignatureCreator() {
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EVP_MD_CTX_destroy(sign_context_);
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}
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// static
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std::unique_ptr<SignatureCreator> SignatureCreator::Create(
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RSAPrivateKey* key,
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HashAlgorithm hash_alg) {
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OpenSSLErrStackTracer err_tracer(FROM_HERE);
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std::unique_ptr<SignatureCreator> result(new SignatureCreator);
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const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
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DCHECK(digest);
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if (!digest) {
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return nullptr;
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}
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if (!EVP_DigestSignInit(result->sign_context_, nullptr, digest, nullptr,
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key->key())) {
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return nullptr;
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}
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return result;
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}
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// static
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bool SignatureCreator::Sign(RSAPrivateKey* key,
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HashAlgorithm hash_alg,
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const uint8_t* data,
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int data_len,
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std::vector<uint8_t>* signature) {
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bssl::UniquePtr<RSA> rsa_key(EVP_PKEY_get1_RSA(key->key()));
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if (!rsa_key)
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return false;
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signature->resize(RSA_size(rsa_key.get()));
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unsigned int len = 0;
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if (!RSA_sign(ToOpenSSLDigestType(hash_alg), data, data_len,
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signature->data(), &len, rsa_key.get())) {
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signature->clear();
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return false;
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}
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signature->resize(len);
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return true;
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}
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bool SignatureCreator::Update(const uint8_t* data_part, int data_part_len) {
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OpenSSLErrStackTracer err_tracer(FROM_HERE);
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return !!EVP_DigestSignUpdate(sign_context_, data_part, data_part_len);
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}
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bool SignatureCreator::Final(std::vector<uint8_t>* signature) {
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OpenSSLErrStackTracer err_tracer(FROM_HERE);
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// Determine the maximum length of the signature.
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size_t len = 0;
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if (!EVP_DigestSignFinal(sign_context_, nullptr, &len)) {
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signature->clear();
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return false;
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}
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signature->resize(len);
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// Sign it.
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if (!EVP_DigestSignFinal(sign_context_, signature->data(), &len)) {
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signature->clear();
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return false;
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}
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signature->resize(len);
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return true;
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}
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SignatureCreator::SignatureCreator() : sign_context_(EVP_MD_CTX_create()) {}
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} // namespace crypto
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