| /* |
| * 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.impl; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| 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.ECPoint; |
| import java.security.spec.ECPrivateKeySpec; |
| import java.security.spec.ECPublicKeySpec; |
| import java.security.spec.InvalidKeySpecException; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| import org.apache.sshd.common.cipher.ECCurves; |
| import org.apache.sshd.common.config.keys.IdentityResourceLoader; |
| import org.apache.sshd.common.config.keys.KeyEntryResolver; |
| import org.apache.sshd.common.config.keys.KeyUtils; |
| import org.apache.sshd.common.session.SessionContext; |
| import org.apache.sshd.common.util.buffer.BufferUtils; |
| import org.apache.sshd.common.util.security.SecurityUtils; |
| |
| /** |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public class ECDSAPublicKeyEntryDecoder extends AbstractPublicKeyEntryDecoder<ECPublicKey, ECPrivateKey> { |
| public static final int MAX_ALLOWED_POINT_SIZE = IdentityResourceLoader.MAX_BIGINT_OCTETS_COUNT; |
| public static final int MAX_CURVE_NAME_LENGTH = 1024; |
| |
| public static final ECDSAPublicKeyEntryDecoder INSTANCE = new ECDSAPublicKeyEntryDecoder(); |
| |
| // see rfc5480 section 2.2 |
| public static final byte ECPOINT_UNCOMPRESSED_FORM_INDICATOR = 0x04; |
| public static final byte ECPOINT_COMPRESSED_VARIANT_2 = 0x02; |
| public static final byte ECPOINT_COMPRESSED_VARIANT_3 = 0x02; |
| |
| public ECDSAPublicKeyEntryDecoder() { |
| super(ECPublicKey.class, ECPrivateKey.class, ECCurves.KEY_TYPES); |
| } |
| |
| @Override |
| public ECPublicKey decodePublicKey( |
| SessionContext session, String keyType, InputStream keyData, Map<String, String> headers) |
| throws IOException, GeneralSecurityException { |
| ECCurves curve = ECCurves.fromKeyType(keyType); |
| if (curve == null) { |
| throw new InvalidKeySpecException("Not an EC curve name: " + keyType); |
| } |
| |
| return decodePublicKey(curve, keyData); |
| } |
| |
| ECPublicKey decodePublicKey(ECCurves curve, InputStream keyData) throws IOException, GeneralSecurityException { |
| if (!SecurityUtils.isECCSupported()) { |
| throw new NoSuchProviderException("ECC not supported"); |
| } |
| |
| String keyCurveName = curve.getName(); |
| // see rfc5656 section 3.1 |
| String encCurveName = KeyEntryResolver.decodeString(keyData, MAX_CURVE_NAME_LENGTH); |
| if (!keyCurveName.equals(encCurveName)) { |
| throw new InvalidKeySpecException( |
| "Mismatched key curve name (" + keyCurveName + ") vs. encoded one (" + encCurveName + ")"); |
| } |
| |
| byte[] octets = KeyEntryResolver.readRLEBytes(keyData, MAX_ALLOWED_POINT_SIZE); |
| ECPoint w; |
| try { |
| w = ECCurves.octetStringToEcPoint(octets); |
| if (w == null) { |
| throw new InvalidKeySpecException( |
| "No ECPoint generated for curve=" + keyCurveName + " from octets=" + BufferUtils.toHex(':', octets)); |
| } |
| } catch (RuntimeException e) { |
| throw new InvalidKeySpecException( |
| "Failed (" + e.getClass().getSimpleName() + ")" + " to generate ECPoint for curve=" + keyCurveName |
| + " from octets=" + BufferUtils.toHex(':', octets) + ": " + e.getMessage()); |
| } |
| |
| ECParameterSpec paramSpec = curve.getParameters(); |
| return generatePublicKey(new ECPublicKeySpec(w, paramSpec)); |
| } |
| |
| @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 String encodePublicKey(OutputStream s, ECPublicKey key) throws IOException { |
| Objects.requireNonNull(key, "No public key provided"); |
| |
| ECParameterSpec params = Objects.requireNonNull(key.getParams(), "No EC parameters available"); |
| ECCurves curve = Objects.requireNonNull(ECCurves.fromCurveParameters(params), "Cannot determine curve"); |
| String keyType = curve.getKeyType(); |
| encodePublicKey(s, keyType, curve, key.getW()); |
| return keyType; |
| } |
| |
| static void encodePublicKey(OutputStream s, String keyType, ECCurves curve, ECPoint w) throws IOException { |
| String curveName = curve.getName(); |
| KeyEntryResolver.encodeString(s, keyType); |
| // see rfc5656 section 3.1 |
| KeyEntryResolver.encodeString(s, curveName); |
| ECCurves.ECPointCompression.UNCOMPRESSED.writeECPoint(s, curveName, w); |
| } |
| |
| @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"); |
| } |
| } |
| } |