| // 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. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.google.crypto.tink.signature; |
| |
| import com.google.crypto.tink.PublicKeyVerify; |
| import com.google.crypto.tink.internal.KeyTypeManager; |
| import com.google.crypto.tink.internal.PrimitiveFactory; |
| import com.google.crypto.tink.proto.KeyData.KeyMaterialType; |
| import com.google.crypto.tink.proto.RsaSsaPssParams; |
| import com.google.crypto.tink.proto.RsaSsaPssPublicKey; |
| import com.google.crypto.tink.signature.internal.SigUtil; |
| import com.google.crypto.tink.subtle.EngineFactory; |
| import com.google.crypto.tink.subtle.RsaSsaPssVerifyJce; |
| import com.google.crypto.tink.subtle.Validators; |
| import com.google.protobuf.ByteString; |
| import com.google.protobuf.ExtensionRegistryLite; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import java.math.BigInteger; |
| import java.security.GeneralSecurityException; |
| import java.security.interfaces.RSAPublicKey; |
| import java.security.spec.RSAPublicKeySpec; |
| |
| /** |
| * This key manager produces new instances of {@code RsaSsaPssVerifyJce}. It doesn't support key |
| * generation. |
| */ |
| class RsaSsaPssVerifyKeyManager extends KeyTypeManager<RsaSsaPssPublicKey> { |
| public RsaSsaPssVerifyKeyManager() { |
| super( |
| RsaSsaPssPublicKey.class, |
| new PrimitiveFactory<PublicKeyVerify, RsaSsaPssPublicKey>(PublicKeyVerify.class) { |
| @Override |
| public PublicKeyVerify getPrimitive(RsaSsaPssPublicKey keyProto) |
| throws GeneralSecurityException { |
| java.security.KeyFactory kf = EngineFactory.KEY_FACTORY.getInstance("RSA"); |
| BigInteger modulus = new BigInteger(1, keyProto.getN().toByteArray()); |
| BigInteger exponent = new BigInteger(1, keyProto.getE().toByteArray()); |
| RSAPublicKey publicKey = |
| (RSAPublicKey) kf.generatePublic(new RSAPublicKeySpec(modulus, exponent)); |
| RsaSsaPssParams params = keyProto.getParams(); |
| return new RsaSsaPssVerifyJce( |
| publicKey, |
| SigUtil.toHashType(params.getSigHash()), |
| SigUtil.toHashType(params.getMgf1Hash()), |
| params.getSaltLength()); |
| } |
| }); |
| } |
| |
| @Override |
| public String getKeyType() { |
| return "type.googleapis.com/google.crypto.tink.RsaSsaPssPublicKey"; |
| } |
| |
| @Override |
| public int getVersion() { |
| return 0; |
| } |
| |
| @Override |
| public KeyMaterialType keyMaterialType() { |
| return KeyMaterialType.ASYMMETRIC_PUBLIC; |
| } |
| |
| @Override |
| public RsaSsaPssPublicKey parseKey(ByteString byteString) throws InvalidProtocolBufferException { |
| return RsaSsaPssPublicKey.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry()); |
| } |
| |
| @Override |
| public void validateKey(RsaSsaPssPublicKey pubKey) throws GeneralSecurityException { |
| Validators.validateVersion(pubKey.getVersion(), getVersion()); |
| Validators.validateRsaModulusSize(new BigInteger(1, pubKey.getN().toByteArray()).bitLength()); |
| Validators.validateRsaPublicExponent(new BigInteger(1, pubKey.getE().toByteArray())); |
| SigUtil.validateRsaSsaPssParams(pubKey.getParams()); |
| } |
| } |