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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.modules;
/*
* Copyright 2011 Gaurav Raje
* Licensed to PSF under a Contributor Agreement.
*/
import java.security.MessageDigest;
/**
* SHA-224 as described in RFC 3874. This introduces the SHA224 Digest which has
* been omitted from the JDK java.security.
*
* This implementation has been borrowed from the Bouncy Castle implementation
* of SHA2 algorithms.
*
* Since they are MIT Licensed, they are compatible with
* this project. Their mandatory copyright notice follows.
*
* Copyright (c) 2000 - 2011 The Legion Of The Bouncy Castle
* (http://www.bouncycastle.org)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
public class SHA224Digest
extends MessageDigest
{
private static final int BYTE_LENGTH = 64;
private byte[] xBuf;
private int xBufOff;
private long byteCount;
@Override
public void update(
byte in)
{
xBuf[xBufOff++] = in;
if (xBufOff == xBuf.length)
{
processWord(xBuf, 0);
xBufOff = 0;
}
byteCount++;
}
@Override
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--;
}
}
public void finish()
{
long bitLength = (byteCount << 3);
//
// add the pad bytes.
//
update((byte) 128);
while (xBufOff != 0)
{
update((byte) 0);
}
processLength(bitLength);
processBlock();
}
public int getByteLength()
{
return BYTE_LENGTH;
}
private static final int DIGEST_LENGTH = 28;
private int H1, H2, H3, H4, H5, H6, H7, H8;
private int[] X = new int[64];
private int xOff;
/**
* Standard constructor
*/
public SHA224Digest()
{
super("SHA-224");
xBuf = new byte[4];
xBufOff = 0;
reset();
}
/**
* Copy constructor. This will copy the state of the provided message
* digest.
*/
public SHA224Digest(SHA224Digest t)
{
super("SHA-224");
xBuf = new byte[t.xBuf.length];
System.arraycopy(t.xBuf, 0, xBuf, 0, t.xBuf.length);
xBufOff = t.xBufOff;
byteCount = t.byteCount;
H1 = t.H1;
H2 = t.H2;
H3 = t.H3;
H4 = t.H4;
H5 = t.H5;
H6 = t.H6;
H7 = t.H7;
H8 = t.H8;
System.arraycopy(t.X, 0, X, 0, t.X.length);
xOff = t.xOff;
}
public String getAlgorithmName()
{
return "SHA-224";
}
public int getDigestSize()
{
return DIGEST_LENGTH;
}
protected void processWord(
byte[] in,
int inOff)
{
// Note: Inlined for performance
// X[xOff] = Pack.bigEndianToInt(in, inOff);
int n = in[inOff] << 24;
n |= (in[++inOff] & 0xff) << 16;
n |= (in[++inOff] & 0xff) << 8;
n |= (in[++inOff] & 0xff);
X[xOff] = n;
if (++xOff == 16)
{
processBlock();
}
}
protected void processLength(
long bitLength)
{
if (xOff > 14)
{
processBlock();
}
X[14] = (int) (bitLength >>> 32);
X[15] = (int) (bitLength & 0xffffffff);
}
public int doFinal(
byte[] out,
int outOff)
{
finish();
intToBigEndian(H1, out, outOff);
intToBigEndian(H2, out, outOff + 4);
intToBigEndian(H3, out, outOff + 8);
intToBigEndian(H4, out, outOff + 12);
intToBigEndian(H5, out, outOff + 16);
intToBigEndian(H6, out, outOff + 20);
intToBigEndian(H7, out, outOff + 24);
reset();
return DIGEST_LENGTH;
}
@Override
public void reset()
{
byteCount = 0;
xBufOff = 0;
for (int i = 0; i < xBuf.length; i++)
{
xBuf[i] = 0;
}
/*
* SHA-224 initial hash value
*/
H1 = 0xc1059ed8;
H2 = 0x367cd507;
H3 = 0x3070dd17;
H4 = 0xf70e5939;
H5 = 0xffc00b31;
H6 = 0x68581511;
H7 = 0x64f98fa7;
H8 = 0xbefa4fa4;
xOff = 0;
for (int i = 0; i != X.length; i++)
{
X[i] = 0;
}
}
protected void processBlock()
{
//
// expand 16 word block into 64 word blocks.
//
for (int t = 16; t <= 63; t++)
{
X[t] = Theta1(X[t - 2]) + X[t - 7] + Theta0(X[t - 15]) + X[t - 16];
}
//
// set up working variables.
//
int a = H1;
int b = H2;
int c = H3;
int d = H4;
int e = H5;
int f = H6;
int g = H7;
int h = H8;
int t = 0;
for (int i = 0; i < 8; i++)
{
// t = 8 * i
h += Sum1(e) + Ch(e, f, g) + K[t] + X[t];
d += h;
h += Sum0(a) + Maj(a, b, c);
++t;
// t = 8 * i + 1
g += Sum1(d) + Ch(d, e, f) + K[t] + X[t];
c += g;
g += Sum0(h) + Maj(h, a, b);
++t;
// t = 8 * i + 2
f += Sum1(c) + Ch(c, d, e) + K[t] + X[t];
b += f;
f += Sum0(g) + Maj(g, h, a);
++t;
// t = 8 * i + 3
e += Sum1(b) + Ch(b, c, d) + K[t] + X[t];
a += e;
e += Sum0(f) + Maj(f, g, h);
++t;
// t = 8 * i + 4
d += Sum1(a) + Ch(a, b, c) + K[t] + X[t];
h += d;
d += Sum0(e) + Maj(e, f, g);
++t;
// t = 8 * i + 5
c += Sum1(h) + Ch(h, a, b) + K[t] + X[t];
g += c;
c += Sum0(d) + Maj(d, e, f);
++t;
// t = 8 * i + 6
b += Sum1(g) + Ch(g, h, a) + K[t] + X[t];
f += b;
b += Sum0(c) + Maj(c, d, e);
++t;
// t = 8 * i + 7
a += Sum1(f) + Ch(f, g, h) + K[t] + X[t];
e += a;
a += Sum0(b) + Maj(b, c, d);
++t;
}
H1 += a;
H2 += b;
H3 += c;
H4 += d;
H5 += e;
H6 += f;
H7 += g;
H8 += h;
//
// reset the offset and clean out the word buffer.
//
xOff = 0;
for (int i = 0; i < 16; i++)
{
X[i] = 0;
}
}
/* SHA-224 functions */
private int Ch(
int x,
int y,
int z)
{
return ((x & y) ^ ((~x) & z));
}
private int Maj(
int x,
int y,
int z)
{
return ((x & y) ^ (x & z) ^ (y & z));
}
private int Sum0(
int x)
{
return ((x >>> 2) | (x << 30)) ^ ((x >>> 13) | (x << 19))
^ ((x >>> 22) | (x << 10));
}
private int Sum1(
int x)
{
return ((x >>> 6) | (x << 26)) ^ ((x >>> 11) | (x << 21))
^ ((x >>> 25) | (x << 7));
}
private int Theta0(
int x)
{
return ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3);
}
private int Theta1(
int x)
{
return ((x >>> 17) | (x << 15)) ^ ((x >>> 19) | (x << 13))
^ (x >>> 10);
}
/*
* SHA-224 Constants (represent the first 32 bits of the fractional parts of
* the cube roots of the first sixty-four prime numbers)
*/
static final int K[] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74,
0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f,
0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3,
0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354,
0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa,
0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
@Override
protected void engineUpdate(byte input) {
update(input);
}
@Override
protected void engineUpdate(byte[] input, int offset, int len) {
update(input, offset, len);
}
@Override
protected byte[] engineDigest() {
byte[] digestBytes = new byte[getDigestSize()];
doFinal(digestBytes, 0);
return digestBytes;
}
@Override
protected void engineReset() {
reset();
}
@Override
public Object clone()
throws CloneNotSupportedException
{
SHA224Digest d = new SHA224Digest(this);
return d;
}
public static int bigEndianToInt(byte[] bs, int off)
{
int n = bs[off] << 24;
n |= (bs[++off] & 0xff) << 16;
n |= (bs[++off] & 0xff) << 8;
n |= (bs[++off] & 0xff);
return n;
}
public static void intToBigEndian(int n, byte[] bs, int off)
{
bs[off] = (byte) (n >>> 24);
bs[++off] = (byte) (n >>> 16);
bs[++off] = (byte) (n >>> 8);
bs[++off] = (byte) (n);
}
public static long bigEndianToLong(byte[] bs, int off)
{
int hi = bigEndianToInt(bs, off);
int lo = bigEndianToInt(bs, off + 4);
return ((hi & 0xffffffffL) << 32) | (lo & 0xffffffffL);
}
public static void longToBigEndian(long n, byte[] bs, int off)
{
intToBigEndian((int) (n >>> 32), bs, off);
intToBigEndian((int) (n & 0xffffffffL), bs, off + 4);
}
}