org.apache.sshd.common.config.keys.loader.pem.DSSPEMResourceKeyPairParser Maven / Gradle / Ivy
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* 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
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* 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.pem;
import java.io.IOException;
import java.io.InputStream;
import java.io.StreamCorruptedException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.sshd.common.NamedResource;
import org.apache.sshd.common.config.keys.FilePasswordProvider;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.io.NoCloseInputStream;
import org.apache.sshd.common.util.io.der.ASN1Object;
import org.apache.sshd.common.util.io.der.ASN1Type;
import org.apache.sshd.common.util.io.der.DERParser;
import org.apache.sshd.common.util.security.SecurityUtils;
/**
* @author Apache MINA SSHD Project
* @see RFC-3279 section 2.3.2
*/
public class DSSPEMResourceKeyPairParser extends AbstractPEMResourceKeyPairParser {
// Not exactly according to standard but good enough
public static final String BEGIN_MARKER = "BEGIN DSA PRIVATE KEY";
public static final List BEGINNERS = Collections.unmodifiableList(Collections.singletonList(BEGIN_MARKER));
public static final String END_MARKER = "END DSA PRIVATE KEY";
public static final List ENDERS = Collections.unmodifiableList(Collections.singletonList(END_MARKER));
public static final String DSS_OID = "1.2.840.10040.4.1";
public static final DSSPEMResourceKeyPairParser INSTANCE = new DSSPEMResourceKeyPairParser();
public DSSPEMResourceKeyPairParser() {
super(KeyUtils.DSS_ALGORITHM, DSS_OID, BEGINNERS, ENDERS);
}
@Override
public Collection extractKeyPairs(
SessionContext session, NamedResource resourceKey,
String beginMarker, String endMarker,
FilePasswordProvider passwordProvider,
InputStream stream, Map headers)
throws IOException, GeneralSecurityException {
KeyPair kp = decodeDSSKeyPair(SecurityUtils.getKeyFactory(KeyUtils.DSS_ALGORITHM), stream, false);
return Collections.singletonList(kp);
}
/**
*
* The ASN.1 syntax for the private key:
*
*
*
*
* DSAPrivateKey ::= SEQUENCE {
* version Version,
* p INTEGER,
* q INTEGER,
* g INTEGER,
* y INTEGER,
* x INTEGER
* }
*
*
*
* @param kf The {@link KeyFactory} To use to generate the keys
* @param s The {@link InputStream} containing the encoded bytes
* @param okToClose true if the method may close the input stream regardless of success
* or failure
* @return The recovered {@link KeyPair}
* @throws IOException If failed to read or decode the bytes
* @throws GeneralSecurityException If failed to generate the keys
*/
public static KeyPair decodeDSSKeyPair(KeyFactory kf, InputStream s, boolean okToClose)
throws IOException, GeneralSecurityException {
ASN1Object sequence;
try (DERParser parser = new DERParser(NoCloseInputStream.resolveInputStream(s, okToClose))) {
sequence = parser.readObject();
}
if (!ASN1Type.SEQUENCE.equals(sequence.getObjType())) {
throw new IOException("Invalid DER: not a sequence: " + sequence.getObjType());
}
// Parse inside the sequence
try (DERParser parser = sequence.createParser()) {
// Skip version
ASN1Object version = parser.readObject();
if (version == null) {
throw new StreamCorruptedException("No version");
}
BigInteger p = parser.readObject().asInteger();
BigInteger q = parser.readObject().asInteger();
BigInteger g = parser.readObject().asInteger();
BigInteger y = parser.readObject().asInteger();
BigInteger x = parser.readObject().asInteger();
PublicKey pubKey = kf.generatePublic(new DSAPublicKeySpec(y, p, q, g));
PrivateKey prvKey = kf.generatePrivate(new DSAPrivateKeySpec(x, p, q, g));
return new KeyPair(pubKey, prvKey);
}
}
}