blob: 20573a14d81dcb19554240bdbf7ee2db75aae8da [file] [log] [blame]
// Copyright 2017 Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "tink/subtle/ecdsa_verify_boringssl.h"
#include "absl/strings/str_cat.h"
#include "openssl/bn.h"
#include "openssl/ec.h"
#include "openssl/ecdsa.h"
#include "openssl/evp.h"
#include "openssl/mem.h"
#include "tink/subtle/common_enums.h"
#include "tink/subtle/subtle_util_boringssl.h"
#include "tink/util/errors.h"
namespace crypto {
namespace tink {
namespace subtle {
// static
util::StatusOr<std::unique_ptr<EcdsaVerifyBoringSsl>> EcdsaVerifyBoringSsl::New(
const SubtleUtilBoringSSL::EcKey& ec_key, HashType hash_type,
EcdsaSignatureEncoding encoding) {
// Check curve.
auto group_result(SubtleUtilBoringSSL::GetEcGroup(ec_key.curve));
if (!group_result.ok()) return group_result.status();
bssl::UniquePtr<EC_GROUP> group(group_result.ValueOrDie());
bssl::UniquePtr<EC_KEY> key(EC_KEY_new());
EC_KEY_set_group(key.get(), group.get());
// Check key.
auto ec_point_result =
SubtleUtilBoringSSL::GetEcPoint(ec_key.curve, ec_key.pub_x, ec_key.pub_y);
if (!ec_point_result.ok()) return ec_point_result.status();
bssl::UniquePtr<EC_POINT> pub_key(ec_point_result.ValueOrDie());
if (!EC_KEY_set_public_key(key.get(), pub_key.get())) {
return util::Status(
absl::StrCat("Invalid public key: ", SubtleUtilBoringSSL::GetErrors()));
return New(std::move(key), hash_type, encoding);
// static
util::StatusOr<std::unique_ptr<EcdsaVerifyBoringSsl>> EcdsaVerifyBoringSsl::New(
bssl::UniquePtr<EC_KEY> ec_key, HashType hash_type,
EcdsaSignatureEncoding encoding) {
auto status = internal::CheckFipsCompatibility<EcdsaVerifyBoringSsl>();
if (!status.ok()) return status;
// Check hash.
auto hash_status = SubtleUtilBoringSSL::ValidateSignatureHash(hash_type);
if (!hash_status.ok()) {
return hash_status;
auto hash_result = SubtleUtilBoringSSL::EvpHash(hash_type);
if (!hash_result.ok()) return hash_result.status();
const EVP_MD* hash = hash_result.ValueOrDie();
std::unique_ptr<EcdsaVerifyBoringSsl> verify(
new EcdsaVerifyBoringSsl(std::move(ec_key), hash, encoding));
return std::move(verify);
util::Status EcdsaVerifyBoringSsl::Verify(absl::string_view signature,
absl::string_view data) const {
// BoringSSL expects a non-null pointer for data,
// regardless of whether the size is 0.
data = SubtleUtilBoringSSL::EnsureNonNull(data);
// Compute the digest.
unsigned int digest_size;
uint8_t digest[EVP_MAX_MD_SIZE];
if (1 != EVP_Digest(, data.size(), digest, &digest_size, hash_,
nullptr)) {
return util::Status(util::error::INTERNAL, "Could not compute digest.");
std::string derSig(signature);
if (encoding_ == subtle::EcdsaSignatureEncoding::IEEE_P1363) {
const EC_GROUP* group = EC_KEY_get0_group(key_.get());
auto status_or_der =
SubtleUtilBoringSSL::EcSignatureIeeeToDer(group, signature);
if (!status_or_der.ok()) {
return status_or_der.status();
derSig = status_or_der.ValueOrDie();
// Verify the signature.
if (1 != ECDSA_verify(0 /* unused */, digest, digest_size,
reinterpret_cast<const uint8_t*>(,
derSig.size(), key_.get())) {
// signature is invalid
return util::Status(util::error::INVALID_ARGUMENT,
"Signature is not valid.");
// signature is valid
return util::Status::OK;
} // namespace subtle
} // namespace tink
} // namespace crypto