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package com.trilead.ssh2.crypto.digest;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.ShortBufferException;
import javax.crypto.spec.SecretKeySpec;
/**
* MAC.
*
* @author Christian Plattner, plattner@trilead.com
* @version $Id: MAC.java,v 1.1 2007/10/15 12:49:57 cplattne Exp $
*/
public final class MAC
{
Mac mac;
int outSize;
int macSize;
byte[] buffer;
/* Higher Priority First */
private static final String[] MAC_LIST = {
"hmac-sha1-96", "hmac-sha1", "hmac-md5-96", "hmac-md5"
};
public final static String[] getMacList()
{
return MAC_LIST;
}
public final static void checkMacList(String[] macs)
{
for (int i = 0; i < macs.length; i++)
getKeyLen(macs[i]);
}
public final static int getKeyLen(String type)
{
if (type.equals("hmac-sha1"))
return 20;
if (type.equals("hmac-sha1-96"))
return 20;
if (type.equals("hmac-md5"))
return 16;
if (type.equals("hmac-md5-96"))
return 16;
throw new IllegalArgumentException("Unkown algorithm " + type);
}
public MAC(String type, byte[] key)
{
try {
if ("hmac-sha1".equals(type) || "hmac-sha1-96".equals(type))
{
mac = Mac.getInstance("HmacSHA1");
}
else if ("hmac-md5".equals(type) || "hmac-md5-96".equals(type))
{
mac = Mac.getInstance("HmacMD5");
}
else
throw new IllegalArgumentException("Unkown algorithm " + type);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("Unknown algorithm " + type, e);
}
macSize = mac.getMacLength();
if (type.endsWith("-96")) {
outSize = 12;
buffer = new byte[macSize];
} else {
outSize = macSize;
buffer = null;
}
try {
mac.init(new SecretKeySpec(key, type));
} catch (InvalidKeyException e) {
throw new IllegalArgumentException(e);
}
}
public final void initMac(int seq)
{
mac.reset();
mac.update((byte) (seq >> 24));
mac.update((byte) (seq >> 16));
mac.update((byte) (seq >> 8));
mac.update((byte) (seq));
}
public final void update(byte[] packetdata, int off, int len)
{
mac.update(packetdata, off, len);
}
public final void getMac(byte[] out, int off)
{
try {
if (buffer != null) {
mac.doFinal(buffer, 0);
System.arraycopy(buffer, 0, out, off, out.length - off);
} else {
mac.doFinal(out, off);
}
} catch (ShortBufferException e) {
throw new IllegalStateException(e);
}
}
public final int size()
{
return outSize;
}
}
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