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package org.bouncycastle.crypto.macs;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.params.KeyParameter;
/**
* HMAC implementation based on RFC2104
*
* H(K XOR opad, H(K XOR ipad, text))
*/
public class OldHMac
implements Mac
{
private final static int BLOCK_LENGTH = 64;
private final static byte IPAD = (byte)0x36;
private final static byte OPAD = (byte)0x5C;
private Digest digest;
private int digestSize;
private byte[] inputPad = new byte[BLOCK_LENGTH];
private byte[] outputPad = new byte[BLOCK_LENGTH];
/**
* @deprecated uses incorrect pad for SHA-512 and SHA-384 use HMac.
*/
public OldHMac(
Digest digest)
{
this.digest = digest;
digestSize = digest.getDigestSize();
}
public String getAlgorithmName()
{
return digest.getAlgorithmName() + "/HMAC";
}
public Digest getUnderlyingDigest()
{
return digest;
}
public void init(
CipherParameters params)
{
digest.reset();
byte[] key = ((KeyParameter)params).getKey();
if (key.length > BLOCK_LENGTH)
{
digest.update(key, 0, key.length);
digest.doFinal(inputPad, 0);
for (int i = digestSize; i < inputPad.length; i++)
{
inputPad[i] = 0;
}
}
else
{
System.arraycopy(key, 0, inputPad, 0, key.length);
for (int i = key.length; i < inputPad.length; i++)
{
inputPad[i] = 0;
}
}
outputPad = new byte[inputPad.length];
System.arraycopy(inputPad, 0, outputPad, 0, inputPad.length);
for (int i = 0; i < inputPad.length; i++)
{
inputPad[i] ^= IPAD;
}
for (int i = 0; i < outputPad.length; i++)
{
outputPad[i] ^= OPAD;
}
digest.update(inputPad, 0, inputPad.length);
}
public int getMacSize()
{
return digestSize;
}
public void update(
byte in)
{
digest.update(in);
}
public void update(
byte[] in,
int inOff,
int len)
{
digest.update(in, inOff, len);
}
public int doFinal(
byte[] out,
int outOff)
{
byte[] tmp = new byte[digestSize];
digest.doFinal(tmp, 0);
digest.update(outputPad, 0, outputPad.length);
digest.update(tmp, 0, tmp.length);
int len = digest.doFinal(out, outOff);
reset();
return len;
}
/**
* Reset the mac generator.
*/
public void reset()
{
/*
* reset the underlying digest.
*/
digest.reset();
/*
* reinitialize the digest.
*/
digest.update(inputPad, 0, inputPad.length);
}
}
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