| // 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. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.google.crypto.tink.signature; |
| |
| import com.google.crypto.tink.KeyTypeManager; |
| import com.google.crypto.tink.PublicKeyVerify; |
| import com.google.crypto.tink.proto.Ed25519PublicKey; |
| import com.google.crypto.tink.proto.KeyData.KeyMaterialType; |
| import com.google.crypto.tink.subtle.Ed25519Verify; |
| import com.google.crypto.tink.subtle.Validators; |
| import com.google.protobuf.ByteString; |
| import com.google.protobuf.ExtensionRegistryLite; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * This key manager produces new instances of {@code Ed25519Verify}. It doesn't support key |
| * generation. |
| */ |
| class Ed25519PublicKeyManager extends KeyTypeManager<Ed25519PublicKey> { |
| public Ed25519PublicKeyManager() { |
| super( |
| Ed25519PublicKey.class, |
| new KeyTypeManager.PrimitiveFactory<PublicKeyVerify, Ed25519PublicKey>( |
| PublicKeyVerify.class) { |
| @Override |
| public PublicKeyVerify getPrimitive(Ed25519PublicKey keyProto) { |
| return new Ed25519Verify(keyProto.getKeyValue().toByteArray()); |
| } |
| }); |
| } |
| |
| @Override |
| public String getKeyType() { |
| return "type.googleapis.com/google.crypto.tink.Ed25519PublicKey"; |
| } |
| |
| @Override |
| public int getVersion() { |
| return 0; |
| } |
| |
| @Override |
| public KeyMaterialType keyMaterialType() { |
| return KeyMaterialType.ASYMMETRIC_PUBLIC; |
| } |
| |
| @Override |
| public Ed25519PublicKey parseKey(ByteString byteString) throws InvalidProtocolBufferException { |
| return Ed25519PublicKey.parseFrom(byteString, ExtensionRegistryLite.getEmptyRegistry()); |
| } |
| |
| @Override |
| public void validateKey(Ed25519PublicKey keyProto) throws GeneralSecurityException { |
| Validators.validateVersion(keyProto.getVersion(), getVersion()); |
| if (keyProto.getKeyValue().size() != Ed25519Verify.PUBLIC_KEY_LEN) { |
| throw new GeneralSecurityException("invalid Ed25519 public key: incorrect key length"); |
| } |
| } |
| } |