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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/signature/ecdsa_verify_key_manager.h"
#include <memory>
#include <utility>
#include "absl/status/status.h"
#include "absl/strings/string_view.h"
#include "tink/internal/ec_util.h"
#include "tink/public_key_verify.h"
#include "tink/subtle/ecdsa_verify_boringssl.h"
#include "tink/util/enums.h"
#include "tink/util/errors.h"
#include "tink/util/protobuf_helper.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
#include "tink/util/validation.h"
#include "proto/ecdsa.pb.h"
namespace crypto {
namespace tink {
using crypto::tink::util::Enums;
using crypto::tink::util::Status;
using crypto::tink::util::StatusOr;
using google::crypto::tink::EcdsaParams;
using google::crypto::tink::EcdsaPublicKey;
using google::crypto::tink::EcdsaSignatureEncoding;
using google::crypto::tink::EllipticCurveType;
using google::crypto::tink::HashType;
StatusOr<std::unique_ptr<PublicKeyVerify>>
EcdsaVerifyKeyManager::PublicKeyVerifyFactory::Create(
const EcdsaPublicKey& ecdsa_public_key) const {
internal::EcKey ec_key;
ec_key.curve = Enums::ProtoToSubtle(ecdsa_public_key.params().curve());
ec_key.pub_x = ecdsa_public_key.x();
ec_key.pub_y = ecdsa_public_key.y();
auto result = subtle::EcdsaVerifyBoringSsl::New(
ec_key, Enums::ProtoToSubtle(ecdsa_public_key.params().hash_type()),
Enums::ProtoToSubtle(ecdsa_public_key.params().encoding()));
if (!result.ok()) return result.status();
return {std::move(result.value())};
}
Status EcdsaVerifyKeyManager::ValidateParams(const EcdsaParams& params) const {
switch (params.encoding()) {
case EcdsaSignatureEncoding::DER: // fall through
case EcdsaSignatureEncoding::IEEE_P1363:
break;
default:
return ToStatusF(absl::StatusCode::kInvalidArgument,
"Unsupported signature encoding: %d", params.encoding());
}
switch (params.curve()) {
case EllipticCurveType::NIST_P256:
// Using SHA512 for curve P256 is fine. However, only the 256
// leftmost bits of the hash is used in signature computation.
// Therefore, we don't allow it here to prevent security illusion.
if (params.hash_type() != HashType::SHA256) {
return Status(absl::StatusCode::kInvalidArgument,
"Only SHA256 is supported for NIST P256.");
}
break;
case EllipticCurveType::NIST_P384:
// Allow using SHA384 and SHA512 with NIST-P384.
if ((params.hash_type() != HashType::SHA384) &&
(params.hash_type() != HashType::SHA512)) {
return Status(absl::StatusCode::kInvalidArgument,
"Only SHA384 and SHA512 are supported for this curve.");
}
break;
case EllipticCurveType::NIST_P521:
if (params.hash_type() != HashType::SHA512) {
return Status(absl::StatusCode::kInvalidArgument,
"Only SHA512 is supported for this curve.");
}
break;
default:
return Status(absl::StatusCode::kInvalidArgument,
"Unsupported elliptic curve");
}
return util::OkStatus();
}
Status EcdsaVerifyKeyManager::ValidateKey(const EcdsaPublicKey& key) const {
Status status = ValidateVersion(key.version(), get_version());
if (!status.ok()) return status;
return ValidateParams(key.params());
}
} // namespace tink
} // namespace crypto
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