GeneralDigestpublic abstract class GeneralDigest extends Object implements org.bouncycastle.crypto.Digestbase implementation of MD4 family style digest as outlined in
"Handbook of Applied Cryptography", pages 344 - 347. |
Fields Summary |
---|
private byte[] | xBuf | private int | xBufOff | private long | byteCount |
Constructors Summary |
---|
protected GeneralDigest()Standard constructor
xBuf = new byte[4];
xBufOff = 0;
| protected GeneralDigest(GeneralDigest t)Copy constructor. We are using copy constructors in place
of the Object.clone() interface as this interface is not
supported by J2ME.
xBuf = new byte[t.xBuf.length];
System.arraycopy(t.xBuf, 0, xBuf, 0, t.xBuf.length);
xBufOff = t.xBufOff;
byteCount = t.byteCount;
|
Methods Summary |
---|
public void | finish()
long bitLength = (byteCount << 3);
//
// add the pad bytes.
//
update((byte)128);
while (xBufOff != 0)
{
update((byte)0);
}
processLength(bitLength);
processBlock();
| protected abstract void | processBlock()
| protected abstract void | processLength(long bitLength)
| protected abstract void | processWord(byte[] in, int inOff)
| public void | reset()
byteCount = 0;
xBufOff = 0;
for ( int i = 0; i < xBuf.length; i++ ) {
xBuf[i] = 0;
}
| public void | update(byte in)
xBuf[xBufOff++] = in;
if (xBufOff == xBuf.length)
{
processWord(xBuf, 0);
xBufOff = 0;
}
byteCount++;
| public void | update(byte[] in, int inOff, int len)
//
// fill the current word
//
while ((xBufOff != 0) && (len > 0))
{
update(in[inOff]);
inOff++;
len--;
}
//
// process whole words.
//
while (len > xBuf.length)
{
processWord(in, inOff);
inOff += xBuf.length;
len -= xBuf.length;
byteCount += xBuf.length;
}
//
// load in the remainder.
//
while (len > 0)
{
update(in[inOff]);
inOff++;
len--;
}
|
|