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// Copyright 2018 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/rsa_ssa_pss_sign_key_manager.h"
#include <memory>
#include <string>
#include <utility>
#include "absl/memory/memory.h"
#include "absl/status/status.h"
#include "absl/strings/string_view.h"
#include "tink/internal/bn_util.h"
#include "tink/internal/rsa_util.h"
#include "tink/internal/ssl_unique_ptr.h"
#include "tink/public_key_sign.h"
#include "tink/signature/rsa_ssa_pss_verify_key_manager.h"
#include "tink/signature/sig_util.h"
#include "tink/subtle/rsa_ssa_pss_sign_boringssl.h"
#include "tink/util/enums.h"
#include "tink/util/errors.h"
#include "tink/util/protobuf_helper.h"
#include "tink/util/secret_data.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
#include "tink/util/validation.h"
#include "proto/rsa_ssa_pss.pb.h"
#include "proto/tink.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::RsaSsaPssKeyFormat;
using google::crypto::tink::RsaSsaPssParams;
using google::crypto::tink::RsaSsaPssPrivateKey;
namespace {
std::unique_ptr<RsaSsaPssPrivateKey> RsaPrivateKeySubtleToProto(
const internal::RsaPrivateKey& private_key) {
auto key_proto = absl::make_unique<RsaSsaPssPrivateKey>();
key_proto->set_version(RsaSsaPssSignKeyManager().get_version());
key_proto->set_d(std::string(util::SecretDataAsStringView(private_key.d)));
key_proto->set_p(std::string(util::SecretDataAsStringView(private_key.p)));
key_proto->set_q(std::string(util::SecretDataAsStringView(private_key.q)));
key_proto->set_dp(std::string(util::SecretDataAsStringView(private_key.dp)));
key_proto->set_dq(std::string(util::SecretDataAsStringView(private_key.dq)));
key_proto->set_crt(
std::string(util::SecretDataAsStringView(private_key.crt)));
auto* public_key_proto = key_proto->mutable_public_key();
public_key_proto->set_version(RsaSsaPssSignKeyManager().get_version());
public_key_proto->set_n(private_key.n);
public_key_proto->set_e(private_key.e);
return key_proto;
}
internal::RsaPrivateKey RsaPrivateKeyProtoToSubtle(
const RsaSsaPssPrivateKey& key_proto) {
internal::RsaPrivateKey key;
key.n = key_proto.public_key().n();
key.e = key_proto.public_key().e();
key.d = util::SecretDataFromStringView(key_proto.d());
key.p = util::SecretDataFromStringView(key_proto.p());
key.q = util::SecretDataFromStringView(key_proto.q());
key.dp = util::SecretDataFromStringView(key_proto.dp());
key.dq = util::SecretDataFromStringView(key_proto.dq());
key.crt = util::SecretDataFromStringView(key_proto.crt());
return key;
}
} // namespace
StatusOr<RsaSsaPssPrivateKey> RsaSsaPssSignKeyManager::CreateKey(
const RsaSsaPssKeyFormat& key_format) const {
util::StatusOr<internal::SslUniquePtr<BIGNUM>> e =
internal::StringToBignum(key_format.public_exponent());
if (!e.ok()) {
return e.status();
}
internal::RsaPrivateKey private_key;
internal::RsaPublicKey public_key;
util::Status status = internal::NewRsaKeyPair(
key_format.modulus_size_in_bits(), e->get(), &private_key, &public_key);
if (!status.ok()) {
return status;
}
RsaSsaPssPrivateKey key_proto =
std::move(*RsaPrivateKeySubtleToProto(private_key));
*key_proto.mutable_public_key()->mutable_params() = key_format.params();
return key_proto;
}
StatusOr<std::unique_ptr<PublicKeySign>>
RsaSsaPssSignKeyManager::PublicKeySignFactory::Create(
const RsaSsaPssPrivateKey& private_key) const {
auto key = RsaPrivateKeyProtoToSubtle(private_key);
internal::RsaSsaPssParams params;
const RsaSsaPssParams& params_proto = private_key.public_key().params();
params.sig_hash = Enums::ProtoToSubtle(params_proto.sig_hash());
params.mgf1_hash = Enums::ProtoToSubtle(params_proto.mgf1_hash());
params.salt_length = params_proto.salt_length();
auto signer = subtle::RsaSsaPssSignBoringSsl::New(key, params);
if (!signer.ok()) return signer.status();
// To check that the key is correct, we sign a test message with private key
// and verify with public key.
auto verifier = RsaSsaPssVerifyKeyManager().GetPrimitive<PublicKeyVerify>(
private_key.public_key());
if (!verifier.ok()) return verifier.status();
auto sign_verify_result =
SignAndVerify(signer.value().get(), verifier.value().get());
if (!sign_verify_result.ok()) {
return util::Status(absl::StatusCode::kInternal,
"security bug: signing with private key followed by "
"verifying with public key failed");
}
return signer;
}
Status RsaSsaPssSignKeyManager::ValidateKey(
const RsaSsaPssPrivateKey& key) const {
Status status = ValidateVersion(key.version(), get_version());
if (!status.ok()) return status;
return RsaSsaPssVerifyKeyManager().ValidateKey(key.public_key());
}
Status RsaSsaPssSignKeyManager::ValidateKeyFormat(
const RsaSsaPssKeyFormat& key_format) const {
Status modulus_status =
internal::ValidateRsaModulusSize(key_format.modulus_size_in_bits());
if (!modulus_status.ok()) {
return modulus_status;
}
Status exponent_status =
internal::ValidateRsaPublicExponent(key_format.public_exponent());
if (!exponent_status.ok()) {
return exponent_status;
}
return RsaSsaPssVerifyKeyManager().ValidateParams(key_format.params());
}
} // namespace tink
} // namespace crypto
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