| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.sshd.common.config.keys.loader.openssh; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.math.BigInteger; |
| import java.security.GeneralSecurityException; |
| import java.security.InvalidKeyException; |
| import java.security.KeyFactory; |
| import java.security.KeyPair; |
| import java.security.KeyPairGenerator; |
| import java.security.NoSuchProviderException; |
| import java.security.interfaces.ECPrivateKey; |
| import java.security.interfaces.ECPublicKey; |
| import java.security.spec.ECParameterSpec; |
| import java.security.spec.ECPrivateKeySpec; |
| import java.security.spec.ECPublicKeySpec; |
| import java.security.spec.InvalidKeySpecException; |
| import java.util.Objects; |
| |
| import org.apache.sshd.common.cipher.ECCurves; |
| import org.apache.sshd.common.config.keys.FilePasswordProvider; |
| import org.apache.sshd.common.config.keys.KeyEntryResolver; |
| import org.apache.sshd.common.config.keys.KeyUtils; |
| import org.apache.sshd.common.config.keys.impl.AbstractPrivateKeyEntryDecoder; |
| import org.apache.sshd.common.config.keys.impl.ECDSAPublicKeyEntryDecoder; |
| import org.apache.sshd.common.session.SessionContext; |
| import org.apache.sshd.common.util.io.output.SecureByteArrayOutputStream; |
| import org.apache.sshd.common.util.security.SecurityUtils; |
| |
| /** |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public class OpenSSHECDSAPrivateKeyEntryDecoder extends AbstractPrivateKeyEntryDecoder<ECPublicKey, ECPrivateKey> { |
| public static final OpenSSHECDSAPrivateKeyEntryDecoder INSTANCE = new OpenSSHECDSAPrivateKeyEntryDecoder(); |
| |
| public OpenSSHECDSAPrivateKeyEntryDecoder() { |
| super(ECPublicKey.class, ECPrivateKey.class, ECCurves.KEY_TYPES); |
| } |
| |
| @Override |
| public ECPrivateKey decodePrivateKey( |
| SessionContext session, String keyType, FilePasswordProvider passwordProvider, InputStream keyData) |
| throws IOException, GeneralSecurityException { |
| ECCurves curve = ECCurves.fromKeyType(keyType); |
| if (curve == null) { |
| throw new InvalidKeySpecException("Not an EC curve name: " + keyType); |
| } |
| |
| if (!SecurityUtils.isECCSupported()) { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| |
| String keyCurveName = curve.getName(); |
| // see rfc5656 section 3.1 |
| String encCurveName = KeyEntryResolver.decodeString(keyData, ECDSAPublicKeyEntryDecoder.MAX_CURVE_NAME_LENGTH); |
| if (!keyCurveName.equals(encCurveName)) { |
| throw new InvalidKeySpecException( |
| "Mismatched key curve name (" + keyCurveName + ") vs. encoded one (" + encCurveName + ")"); |
| } |
| |
| byte[] pubKey = KeyEntryResolver.readRLEBytes(keyData, ECDSAPublicKeyEntryDecoder.MAX_ALLOWED_POINT_SIZE); |
| Objects.requireNonNull(pubKey, "No public point"); // TODO validate it is a valid ECPoint |
| BigInteger s = KeyEntryResolver.decodeBigInt(keyData); |
| ECParameterSpec params = curve.getParameters(); |
| return generatePrivateKey(new ECPrivateKeySpec(s, params)); |
| } |
| |
| @Override |
| public String encodePrivateKey(SecureByteArrayOutputStream s, ECPrivateKey key, ECPublicKey pubKey) throws IOException { |
| Objects.requireNonNull(key, "No private key provided"); |
| Objects.requireNonNull(pubKey, "No public key provided"); |
| ECCurves curve = ECCurves.fromECKey(key); |
| if (curve == null) { |
| return null; |
| } |
| String curveName = curve.getName(); |
| KeyEntryResolver.encodeString(s, curveName); |
| ECCurves.ECPointCompression.UNCOMPRESSED.writeECPoint(s, |
| curveName, pubKey.getW()); |
| KeyEntryResolver.encodeBigInt(s, key.getS()); |
| return curve.getKeyType(); |
| } |
| |
| @Override |
| public ECPublicKey recoverPublicKey(ECPrivateKey prvKey) throws GeneralSecurityException { |
| ECCurves curve = ECCurves.fromECKey(prvKey); |
| if (curve == null) { |
| throw new InvalidKeyException("Unknown curve"); |
| } |
| // TODO see how we can figure out the public value |
| return super.recoverPublicKey(prvKey); |
| } |
| |
| @Override |
| public ECPublicKey clonePublicKey(ECPublicKey key) throws GeneralSecurityException { |
| if (!SecurityUtils.isECCSupported()) { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| |
| if (key == null) { |
| return null; |
| } |
| |
| ECParameterSpec params = key.getParams(); |
| if (params == null) { |
| throw new InvalidKeyException("Missing parameters in key"); |
| } |
| |
| return generatePublicKey(new ECPublicKeySpec(key.getW(), params)); |
| } |
| |
| @Override |
| public ECPrivateKey clonePrivateKey(ECPrivateKey key) throws GeneralSecurityException { |
| if (!SecurityUtils.isECCSupported()) { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| |
| if (key == null) { |
| return null; |
| } |
| |
| ECParameterSpec params = key.getParams(); |
| if (params == null) { |
| throw new InvalidKeyException("Missing parameters in key"); |
| } |
| |
| return generatePrivateKey(new ECPrivateKeySpec(key.getS(), params)); |
| } |
| |
| @Override |
| public KeyFactory getKeyFactoryInstance() throws GeneralSecurityException { |
| if (SecurityUtils.isECCSupported()) { |
| return SecurityUtils.getKeyFactory(KeyUtils.EC_ALGORITHM); |
| } else { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| } |
| |
| @Override |
| public KeyPair generateKeyPair(int keySize) throws GeneralSecurityException { |
| ECCurves curve = ECCurves.fromCurveSize(keySize); |
| if (curve == null) { |
| throw new InvalidKeySpecException("Unknown curve for key size=" + keySize); |
| } |
| |
| KeyPairGenerator gen = getKeyPairGenerator(); |
| gen.initialize(curve.getParameters()); |
| return gen.generateKeyPair(); |
| } |
| |
| @Override |
| public KeyPairGenerator getKeyPairGenerator() throws GeneralSecurityException { |
| if (SecurityUtils.isECCSupported()) { |
| return SecurityUtils.getKeyPairGenerator(KeyUtils.EC_ALGORITHM); |
| } else { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| } |
| } |