com.sshtools.ssh.components.jce.HmacSha1 Maven / Gradle / Ivy
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/**
* Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
*
* For product documentation visit https://www.sshtools.com/
*
* This file is part of J2SSH Maverick.
*
* J2SSH Maverick is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* J2SSH Maverick is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with J2SSH Maverick. If not, see .
*/
package com.sshtools.ssh.components.jce;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import com.sshtools.ssh.SshException;
/**
* SHA-1 message authentication implementation.
*
* @author Lee David Painter
*
*/
public class HmacSha1 extends AbstractHmac {
public HmacSha1() {
super(JCEAlgorithms.JCE_HMACSHA1, 20);
}
public String getAlgorithm() {
return "hmac-sha1";
}
public void init(byte[] keydata) throws SshException {
try {
mac = JCEProvider.getProviderForAlgorithm(jceAlgorithm) == null ? Mac
.getInstance(jceAlgorithm) : Mac.getInstance(jceAlgorithm,
JCEProvider.getProviderForAlgorithm(jceAlgorithm));
// Create a key of 16 bytes
byte[] key = new byte[System.getProperty(
"miscomputes.ssh2.hmac.keys", "false").equalsIgnoreCase(
"true") ? 16 : 20];
System.arraycopy(keydata, 0, key, 0, key.length);
SecretKeySpec keyspec = new SecretKeySpec(key, jceAlgorithm);
mac.init(keyspec);
} catch (Throwable t) {
throw new SshException(t);
}
}
}