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// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////////////
#include "tink/subtle/ecdsa_verify_boringssl.h"
#include <memory>
#include <string>
#include <utility>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "openssl/bn.h"
#include "openssl/ec.h"
#include "openssl/ecdsa.h"
#include "openssl/evp.h"
#include "tink/internal/ec_util.h"
#include "tink/internal/err_util.h"
#include "tink/internal/md_util.h"
#include "tink/internal/ssl_unique_ptr.h"
#include "tink/internal/util.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 {
util::StatusOr<std::unique_ptr<EcdsaVerifyBoringSsl>> EcdsaVerifyBoringSsl::New(
const SubtleUtilBoringSSL::EcKey& ec_key, HashType hash_type,
EcdsaSignatureEncoding encoding) {
// Check curve.
auto group_result = internal::EcGroupFromCurveType(ec_key.curve);
if (!group_result.ok()) return group_result.status();
internal::SslUniquePtr<EC_GROUP> group = std::move(group_result.value());
internal::SslUniquePtr<EC_KEY> key(EC_KEY_new());
EC_KEY_set_group(key.get(), group.get());
// Check key.
auto ec_point_result =
internal::GetEcPoint(ec_key.curve, ec_key.pub_x, ec_key.pub_y);
if (!ec_point_result.ok()) return ec_point_result.status();
internal::SslUniquePtr<EC_POINT> pub_key = std::move(ec_point_result.value());
if (!EC_KEY_set_public_key(key.get(), pub_key.get())) {
return util::Status(
absl::StatusCode::kInvalidArgument,
absl::StrCat("Invalid public key: ", internal::GetSslErrors()));
}
return New(std::move(key), hash_type, encoding);
}
util::StatusOr<std::unique_ptr<EcdsaVerifyBoringSsl>> EcdsaVerifyBoringSsl::New(
internal::SslUniquePtr<EC_KEY> ec_key, HashType hash_type,
EcdsaSignatureEncoding encoding) {
util::Status status =
internal::CheckFipsCompatibility<EcdsaVerifyBoringSsl>();
if (!status.ok()) {
return status;
}
// Check if the hash type is safe to use.
util::Status is_safe = internal::IsHashTypeSafeForSignature(hash_type);
if (!is_safe.ok()) {
return is_safe;
}
util::StatusOr<const EVP_MD*> hash = internal::EvpHashFromHashType(hash_type);
if (!hash.ok()) {
return hash.status();
}
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 = internal::EnsureStringNonNull(data);
// Compute the digest.
unsigned int digest_size;
uint8_t digest[EVP_MAX_MD_SIZE];
if (1 != EVP_Digest(data.data(), data.size(), digest, &digest_size, hash_,
nullptr)) {
return util::Status(absl::StatusCode::kInternal,
"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 = internal::EcSignatureIeeeToDer(group, signature);
if (!status_or_der.ok()) {
return status_or_der.status();
}
derSig = status_or_der.value();
}
// Verify the signature.
if (1 != ECDSA_verify(0 /* unused */, digest, digest_size,
reinterpret_cast<const uint8_t*>(derSig.data()),
derSig.size(), key_.get())) {
// signature is invalid
return util::Status(absl::StatusCode::kInvalidArgument,
"Signature is not valid.");
}
// signature is valid
return util::OkStatus();
}
} // namespace subtle
} // namespace tink
} // namespace crypto
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