/*
* SSHTools - Java SSH2 API
*
* Copyright (C) 2002-2003 Lee David Painter and Contributors.
*
* Contributions made by:
*
* Brett Smith
* Richard Pernavas
* Erwin Bolwidt
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package com.sshtools.j2ssh.transport.publickey;
import com.sshtools.j2ssh.util.Hash;
import java.security.NoSuchAlgorithmException;
/**
*
*
* @author $author$
* @version $Revision: 1.24 $
*/
public abstract class SshPublicKey {
/**
*
*
* @return
*/
public abstract String getAlgorithmName();
/**
*
*
* @return
*/
public abstract int getBitLength();
/**
*
*
* @return
*/
public abstract byte[] getEncoded();
/**
*
*
* @return
*/
public String getFingerprint() {
try {
Hash md5 = new Hash("MD5");
md5.putBytes(getEncoded());
byte[] digest = md5.doFinal();
int bits = getBitLength();
bits = (((bits % 8) != 0) ? (bits += (bits % 8)) : bits);
String ret = String.valueOf(bits);
for (int i = 0; i < digest.length; i++) {
ret += (((i == 0) ? ":" : "") + " " +
Integer.toHexString(digest[i] & 0xFF));
}
return ret;
} catch (NoSuchAlgorithmException nsae) {
return null;
}
}
/**
*
*
* @param obj
*
* @return
*/
public boolean equals(Object obj) {
if (obj instanceof SshPublicKey) {
return (getFingerprint().compareTo(((SshPublicKey) obj).getFingerprint()) == 0);
}
return false;
}
/**
*
*
* @return
*/
public int hashCode() {
return getFingerprint().hashCode();
}
/**
*
*
* @param signature
* @param exchangeHash
*
* @return
*
* @throws InvalidSshKeySignatureException
*/
public abstract boolean verifySignature(byte[] signature,
byte[] exchangeHash) throws InvalidSshKeySignatureException;
}