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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/ec_signature_creator_impl.h"
#include <stddef.h>
#include <stdint.h>
#include "crypto/ec_private_key.h"
#include "crypto/openssl_util.h"
#include "third_party/boringssl/src/include/openssl/bn.h"
#include "third_party/boringssl/src/include/openssl/ec.h"
#include "third_party/boringssl/src/include/openssl/ecdsa.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/sha.h"
namespace crypto {
ECSignatureCreatorImpl::ECSignatureCreatorImpl(ECPrivateKey* key) : key_(key) {}
ECSignatureCreatorImpl::~ECSignatureCreatorImpl() = default;
bool ECSignatureCreatorImpl::Sign(base::span<const uint8_t> data,
std::vector<uint8_t>* signature) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
bssl::ScopedEVP_MD_CTX ctx;
size_t sig_len = 0;
if (!ctx.get() ||
!EVP_DigestSignInit(ctx.get(), nullptr, EVP_sha256(), nullptr,
key_->key()) ||
!EVP_DigestSignUpdate(ctx.get(), data.data(), data.size()) ||
!EVP_DigestSignFinal(ctx.get(), nullptr, &sig_len)) {
return false;
}
signature->resize(sig_len);
if (!EVP_DigestSignFinal(ctx.get(), &signature->front(), &sig_len))
return false;
// NOTE: A call to EVP_DigestSignFinal() with a nullptr second parameter
// returns a maximum allocation size, while the call without a nullptr
// returns the real one, which may be smaller.
signature->resize(sig_len);
return true;
}
} // namespace crypto
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