| // 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.PrivateKeyTypeManager; |
| import com.google.crypto.tink.PublicKeySign; |
| import com.google.crypto.tink.proto.Ed25519KeyFormat; |
| import com.google.crypto.tink.proto.Ed25519PrivateKey; |
| import com.google.crypto.tink.proto.Ed25519PublicKey; |
| import com.google.crypto.tink.proto.KeyData.KeyMaterialType; |
| import com.google.crypto.tink.subtle.Ed25519Sign; |
| import com.google.crypto.tink.subtle.Validators; |
| import com.google.protobuf.ByteString; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import java.security.GeneralSecurityException; |
| |
| /** |
| * This instance of {@code KeyManager} generates new {@code Ed25519PrivateKey} keys and produces new |
| * instances of {@code Ed25519Sign}. |
| */ |
| class Ed25519PrivateKeyManager extends PrivateKeyTypeManager<Ed25519PrivateKey, Ed25519PublicKey> { |
| public Ed25519PrivateKeyManager() { |
| super( |
| Ed25519PrivateKey.class, |
| Ed25519PublicKey.class, |
| new PrimitiveFactory<PublicKeySign, Ed25519PrivateKey>(PublicKeySign.class) { |
| @Override |
| public PublicKeySign getPrimitive(Ed25519PrivateKey keyProto) |
| throws GeneralSecurityException { |
| return new Ed25519Sign(keyProto.getKeyValue().toByteArray()); |
| } |
| }); |
| } |
| |
| @Override |
| public String getKeyType() { |
| return "type.googleapis.com/google.crypto.tink.Ed25519PrivateKey"; |
| } |
| |
| @Override |
| public int getVersion() { |
| return 0; |
| } |
| |
| @Override |
| public Ed25519PublicKey getPublicKey(Ed25519PrivateKey key) throws GeneralSecurityException { |
| return key.getPublicKey(); |
| } |
| |
| @Override |
| public KeyMaterialType keyMaterialType() { |
| return KeyMaterialType.ASYMMETRIC_PRIVATE; |
| } |
| |
| @Override |
| public Ed25519PrivateKey parseKey(ByteString byteString) throws InvalidProtocolBufferException { |
| return Ed25519PrivateKey.parseFrom(byteString); |
| } |
| |
| @Override |
| public void validateKey(Ed25519PrivateKey keyProto) throws GeneralSecurityException { |
| Validators.validateVersion(keyProto.getVersion(), getVersion()); |
| new Ed25519PublicKeyManager().validateKey(keyProto.getPublicKey()); |
| if (keyProto.getKeyValue().size() != Ed25519Sign.SECRET_KEY_LEN) { |
| throw new GeneralSecurityException("invalid Ed25519 private key: incorrect key length"); |
| } |
| } |
| |
| @Override |
| public KeyFactory<Ed25519KeyFormat, Ed25519PrivateKey> keyFactory() { |
| return new KeyFactory<Ed25519KeyFormat, Ed25519PrivateKey>(Ed25519KeyFormat.class) { |
| @Override |
| public void validateKeyFormat(Ed25519KeyFormat format) throws GeneralSecurityException {} |
| |
| @Override |
| public Ed25519KeyFormat parseKeyFormat(ByteString byteString) |
| throws InvalidProtocolBufferException { |
| return Ed25519KeyFormat.parseFrom(byteString); |
| } |
| |
| @Override |
| public Ed25519PrivateKey createKey(Ed25519KeyFormat format) throws GeneralSecurityException { |
| Ed25519Sign.KeyPair keyPair = Ed25519Sign.KeyPair.newKeyPair(); |
| Ed25519PublicKey publicKey = |
| Ed25519PublicKey.newBuilder() |
| .setVersion(getVersion()) |
| .setKeyValue(ByteString.copyFrom(keyPair.getPublicKey())) |
| .build(); |
| return Ed25519PrivateKey.newBuilder() |
| .setVersion(getVersion()) |
| .setKeyValue(ByteString.copyFrom(keyPair.getPrivateKey())) |
| .setPublicKey(publicKey) |
| .build(); |
| } |
| }; |
| } |
| } |