| // 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.Registry; |
| import com.google.crypto.tink.proto.EcdsaKeyFormat; |
| import com.google.crypto.tink.proto.EcdsaParams; |
| import com.google.crypto.tink.proto.EcdsaPrivateKey; |
| import com.google.crypto.tink.proto.EcdsaPublicKey; |
| import com.google.crypto.tink.proto.KeyData.KeyMaterialType; |
| import com.google.crypto.tink.subtle.EcdsaSignJce; |
| import com.google.crypto.tink.subtle.EllipticCurves; |
| import com.google.crypto.tink.subtle.Validators; |
| import com.google.protobuf.ByteString; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import java.security.GeneralSecurityException; |
| import java.security.KeyPair; |
| import java.security.interfaces.ECPrivateKey; |
| import java.security.interfaces.ECPublicKey; |
| import java.security.spec.ECPoint; |
| |
| /** |
| * This key manager generates new {@code EcdsaPrivateKey} keys and produces new instances of {@code |
| * EcdsaSignJce}. |
| */ |
| public class EcdsaSignKeyManager extends PrivateKeyTypeManager<EcdsaPrivateKey, EcdsaPublicKey> { |
| EcdsaSignKeyManager() { |
| super( |
| EcdsaPrivateKey.class, |
| EcdsaPublicKey.class, |
| new PrimitiveFactory<PublicKeySign, EcdsaPrivateKey>(PublicKeySign.class) { |
| @Override |
| public PublicKeySign getPrimitive(EcdsaPrivateKey key) throws GeneralSecurityException { |
| ECPrivateKey privateKey = |
| EllipticCurves.getEcPrivateKey( |
| SigUtil.toCurveType(key.getPublicKey().getParams().getCurve()), |
| key.getKeyValue().toByteArray()); |
| return new EcdsaSignJce( |
| privateKey, |
| SigUtil.toHashType(key.getPublicKey().getParams().getHashType()), |
| SigUtil.toEcdsaEncoding(key.getPublicKey().getParams().getEncoding())); |
| } |
| }); |
| } |
| |
| @Override |
| public String getKeyType() { |
| return "type.googleapis.com/google.crypto.tink.EcdsaPrivateKey"; |
| } |
| |
| @Override |
| public int getVersion() { |
| return 0; |
| } |
| |
| @Override |
| public EcdsaPublicKey getPublicKey(EcdsaPrivateKey key) throws GeneralSecurityException { |
| return key.getPublicKey(); |
| } |
| |
| @Override |
| public KeyMaterialType keyMaterialType() { |
| return KeyMaterialType.ASYMMETRIC_PRIVATE; |
| } |
| |
| @Override |
| public EcdsaPrivateKey parseKey(ByteString byteString) |
| throws InvalidProtocolBufferException { |
| return EcdsaPrivateKey.parseFrom(byteString); |
| } |
| |
| @Override |
| public void validateKey(EcdsaPrivateKey privKey) throws GeneralSecurityException { |
| Validators.validateVersion(privKey.getVersion(), getVersion()); |
| SigUtil.validateEcdsaParams(privKey.getPublicKey().getParams()); |
| } |
| |
| @Override |
| public KeyFactory<EcdsaKeyFormat, EcdsaPrivateKey> keyFactory() { |
| return new KeyFactory<EcdsaKeyFormat, EcdsaPrivateKey>(EcdsaKeyFormat.class) { |
| @Override |
| public void validateKeyFormat(EcdsaKeyFormat format) throws GeneralSecurityException { |
| SigUtil.validateEcdsaParams(format.getParams()); |
| } |
| |
| @Override |
| public EcdsaKeyFormat parseKeyFormat(ByteString byteString) |
| throws InvalidProtocolBufferException { |
| return EcdsaKeyFormat.parseFrom(byteString); |
| } |
| |
| @Override |
| public EcdsaPrivateKey createKey(EcdsaKeyFormat format) throws GeneralSecurityException { |
| EcdsaParams ecdsaParams = format.getParams(); |
| KeyPair keyPair = |
| EllipticCurves.generateKeyPair(SigUtil.toCurveType(ecdsaParams.getCurve())); |
| ECPublicKey pubKey = (ECPublicKey) keyPair.getPublic(); |
| ECPrivateKey privKey = (ECPrivateKey) keyPair.getPrivate(); |
| ECPoint w = pubKey.getW(); |
| |
| // Creates EcdsaPublicKey. |
| EcdsaPublicKey ecdsaPubKey = |
| EcdsaPublicKey.newBuilder() |
| .setVersion(getVersion()) |
| .setParams(ecdsaParams) |
| .setX(ByteString.copyFrom(w.getAffineX().toByteArray())) |
| .setY(ByteString.copyFrom(w.getAffineY().toByteArray())) |
| .build(); |
| |
| // Creates EcdsaPrivateKey. |
| return EcdsaPrivateKey.newBuilder() |
| .setVersion(getVersion()) |
| .setPublicKey(ecdsaPubKey) |
| .setKeyValue(ByteString.copyFrom(privKey.getS().toByteArray())) |
| .build(); |
| } |
| }; |
| } |
| |
| /** |
| * Registers the {@link EcdsaSignKeyManager} and the {@link EcdsaVerifyKeyManager} with the |
| * registry, so that the the Ecdsa-Keys can be used with Tink. |
| */ |
| public static void registerPair(boolean newKeyAllowed) throws GeneralSecurityException { |
| Registry.registerAsymmetricKeyManagers( |
| new EcdsaSignKeyManager(), new EcdsaVerifyKeyManager(), newKeyAllowed); |
| } |
| } |