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package com.trilead.ssh2.crypto.digest;
import java.math.BigInteger;
import java.security.DigestException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* HashForSSH2Types.
*
* @author Christian Plattner, plattner@trilead.com
* @version $Id: HashForSSH2Types.java,v 1.1 2007/10/15 12:49:57 cplattne Exp $
*/
public class HashForSSH2Types
{
MessageDigest md;
public HashForSSH2Types(String type)
{
try {
md = MessageDigest.getInstance(type);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Unsupported algorithm " + type);
}
}
public void updateByte(byte b)
{
/* HACK - to test it with J2ME */
byte[] tmp = new byte[1];
tmp[0] = b;
md.update(tmp);
}
public void updateBytes(byte[] b)
{
md.update(b);
}
public void updateUINT32(int v)
{
md.update((byte) (v >> 24));
md.update((byte) (v >> 16));
md.update((byte) (v >> 8));
md.update((byte) (v));
}
public void updateByteString(byte[] b)
{
updateUINT32(b.length);
updateBytes(b);
}
public void updateBigInt(BigInteger b)
{
updateByteString(b.toByteArray());
}
public void reset()
{
md.reset();
}
public int getDigestLength()
{
return md.getDigestLength();
}
public byte[] getDigest()
{
byte[] tmp = new byte[md.getDigestLength()];
getDigest(tmp);
return tmp;
}
public void getDigest(byte[] out)
{
getDigest(out, 0);
}
public void getDigest(byte[] out, int off)
{
try {
md.digest(out, off, out.length - off);
} catch (DigestException e) {
// TODO is this right?!
throw new RuntimeException("Unable to digest", e);
}
}
}
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