/*
* 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.signature;
import java.security.PrivateKey;
import java.security.PublicKey;
import org.apache.sshd.common.Signature;
import org.apache.sshd.common.util.SecurityUtils;
/**
* TODO Add javadoc
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public abstract class AbstractSignature implements Signature {
protected java.security.Signature signature;
protected String algorithm;
protected AbstractSignature(String algorithm) {
this.algorithm = algorithm;
}
public void init(PublicKey pubkey, PrivateKey prvkey) throws Exception {
signature = SecurityUtils.getSignature(algorithm);
if (pubkey != null) {
signature.initVerify(pubkey);
}
if (prvkey != null) {
signature.initSign(prvkey);
}
}
public void update(byte[] foo, int off, int len) throws Exception {
signature.update(foo, off, len);
}
protected byte[] extractSig(byte[] sig) {
if (sig[0] == 0 && sig[1] == 0 && sig[2] == 0) {
int i = 0;
int j;
j = ((sig[i++] << 24) & 0xff000000) |
((sig[i++] << 16) & 0x00ff0000) |
((sig[i++] << 8) & 0x0000ff00) |
((sig[i++] ) & 0x000000ff);
i += j;
j = ((sig[i++] << 24) & 0xff000000) |
((sig[i++] << 16) & 0x00ff0000) |
((sig[i++] << 8 ) & 0x0000ff00) |
((sig[i++] ) & 0x000000ff);
byte[] tmp = new byte[j];
System.arraycopy(sig, i, tmp, 0, j);
sig = tmp;
}
return sig;
}
}