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Microsoft JDBC Driver for SQL Server.
/*
* Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
* available under the terms of the MIT License. See the LICENSE file in the project root for more information.
*/
/**
* This code is extracted from org.bouncycastle.crypto.digests.MD4Digest and modified to remove dependencies.
*/
package mssql.security.provider;
public class MD4 {
private final byte[] xBuf = new byte[4];
private int xBufOff;
private long byteCount;
private static final int DIGEST_LENGTH = 16;
private int H1, H2, H3, H4; // IV's
private int[] X = new int[16];
private int xOff;
/**
* Standard constructor
*/
public MD4() {
reset();
}
/**
* Copy constructor. This will copy the state of the provided message digest.
*/
public MD4(MD4 t) {
System.arraycopy(t.xBuf, 0, xBuf, 0, t.xBuf.length);
xBufOff = t.xBufOff;
byteCount = t.byteCount;
copyIn(t);
}
private void copyIn(MD4 t) {
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;
System.arraycopy(t.X, 0, X, 0, t.X.length);
xOff = t.xOff;
}
public String getAlgorithmName() {
return "MD4";
}
public int getDigestSize() {
return DIGEST_LENGTH;
}
protected void processWord(byte[] in, int inOff) {
X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8) | ((in[inOff + 2] & 0xff) << 16)
| ((in[inOff + 3] & 0xff) << 24);
if (xOff == 16) {
processBlock();
}
}
protected void processLength(long bitLength) {
if (xOff > 14) {
processBlock();
}
X[14] = (int) (bitLength & 0xffffffff);
X[15] = (int) (bitLength >>> 32);
}
private void unpackWord(int word, byte[] out, int outOff) {
out[outOff] = (byte) word;
out[outOff + 1] = (byte) (word >>> 8);
out[outOff + 2] = (byte) (word >>> 16);
out[outOff + 3] = (byte) (word >>> 24);
}
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) {
len = Math.max(0, len);
//
// fill the current word
//
int i = 0;
if (xBufOff != 0) {
while (i < len) {
xBuf[xBufOff++] = in[inOff + i++];
if (xBufOff == 4) {
processWord(xBuf, 0);
xBufOff = 0;
break;
}
}
}
//
// process whole words.
//
int limit = ((len - i) & ~3) + i;
for (; i < limit; i += 4) {
processWord(in, inOff + i);
}
//
// load in the remainder.
//
while (i < len) {
xBuf[xBufOff++] = in[inOff + i++];
}
byteCount += 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 doFinal(byte[] out, int outOff) {
finish();
unpackWord(H1, out, outOff);
unpackWord(H2, out, outOff + 4);
unpackWord(H3, out, outOff + 8);
unpackWord(H4, out, outOff + 12);
reset();
return DIGEST_LENGTH;
}
/**
* reset the chaining variables to the IV values.
*/
public void reset() {
byteCount = 0;
xBufOff = 0;
for (int i = 0; i < xBuf.length; i++) {
xBuf[i] = 0;
}
H1 = 0x67452301;
H2 = 0xefcdab89;
H3 = 0x98badcfe;
H4 = 0x10325476;
xOff = 0;
for (int i = 0; i != X.length; i++) {
X[i] = 0;
}
}
//
// round 1 left rotates
//
private static final int S11 = 3;
private static final int S12 = 7;
private static final int S13 = 11;
private static final int S14 = 19;
//
// round 2 left rotates
//
private static final int S21 = 3;
private static final int S22 = 5;
private static final int S23 = 9;
private static final int S24 = 13;
//
// round 3 left rotates
//
private static final int S31 = 3;
private static final int S32 = 9;
private static final int S33 = 11;
private static final int S34 = 15;
/*
* rotate int x left n bits.
*/
private int rotateLeft(int x, int n) {
return (x << n) | (x >>> (32 - n));
}
/*
* F, G, H and I are the basic MD4 functions.
*/
private int F(int u, int v, int w) {
return (u & v) | (~u & w);
}
private int G(int u, int v, int w) {
return (u & v) | (u & w) | (v & w);
}
private int H(int u, int v, int w) {
return u ^ v ^ w;
}
protected void processBlock() {
int a = H1;
int b = H2;
int c = H3;
int d = H4;
//
// Round 1 - F cycle, 16 times.
//
a = rotateLeft(a + F(b, c, d) + X[0], S11);
d = rotateLeft(d + F(a, b, c) + X[1], S12);
c = rotateLeft(c + F(d, a, b) + X[2], S13);
b = rotateLeft(b + F(c, d, a) + X[3], S14);
a = rotateLeft(a + F(b, c, d) + X[4], S11);
d = rotateLeft(d + F(a, b, c) + X[5], S12);
c = rotateLeft(c + F(d, a, b) + X[6], S13);
b = rotateLeft(b + F(c, d, a) + X[7], S14);
a = rotateLeft(a + F(b, c, d) + X[8], S11);
d = rotateLeft(d + F(a, b, c) + X[9], S12);
c = rotateLeft(c + F(d, a, b) + X[10], S13);
b = rotateLeft(b + F(c, d, a) + X[11], S14);
a = rotateLeft(a + F(b, c, d) + X[12], S11);
d = rotateLeft(d + F(a, b, c) + X[13], S12);
c = rotateLeft(c + F(d, a, b) + X[14], S13);
b = rotateLeft(b + F(c, d, a) + X[15], S14);
//
// Round 2 - G cycle, 16 times.
//
a = rotateLeft(a + G(b, c, d) + X[0] + 0x5a827999, S21);
d = rotateLeft(d + G(a, b, c) + X[4] + 0x5a827999, S22);
c = rotateLeft(c + G(d, a, b) + X[8] + 0x5a827999, S23);
b = rotateLeft(b + G(c, d, a) + X[12] + 0x5a827999, S24);
a = rotateLeft(a + G(b, c, d) + X[1] + 0x5a827999, S21);
d = rotateLeft(d + G(a, b, c) + X[5] + 0x5a827999, S22);
c = rotateLeft(c + G(d, a, b) + X[9] + 0x5a827999, S23);
b = rotateLeft(b + G(c, d, a) + X[13] + 0x5a827999, S24);
a = rotateLeft(a + G(b, c, d) + X[2] + 0x5a827999, S21);
d = rotateLeft(d + G(a, b, c) + X[6] + 0x5a827999, S22);
c = rotateLeft(c + G(d, a, b) + X[10] + 0x5a827999, S23);
b = rotateLeft(b + G(c, d, a) + X[14] + 0x5a827999, S24);
a = rotateLeft(a + G(b, c, d) + X[3] + 0x5a827999, S21);
d = rotateLeft(d + G(a, b, c) + X[7] + 0x5a827999, S22);
c = rotateLeft(c + G(d, a, b) + X[11] + 0x5a827999, S23);
b = rotateLeft(b + G(c, d, a) + X[15] + 0x5a827999, S24);
//
// Round 3 - H cycle, 16 times.
//
a = rotateLeft(a + H(b, c, d) + X[0] + 0x6ed9eba1, S31);
d = rotateLeft(d + H(a, b, c) + X[8] + 0x6ed9eba1, S32);
c = rotateLeft(c + H(d, a, b) + X[4] + 0x6ed9eba1, S33);
b = rotateLeft(b + H(c, d, a) + X[12] + 0x6ed9eba1, S34);
a = rotateLeft(a + H(b, c, d) + X[2] + 0x6ed9eba1, S31);
d = rotateLeft(d + H(a, b, c) + X[10] + 0x6ed9eba1, S32);
c = rotateLeft(c + H(d, a, b) + X[6] + 0x6ed9eba1, S33);
b = rotateLeft(b + H(c, d, a) + X[14] + 0x6ed9eba1, S34);
a = rotateLeft(a + H(b, c, d) + X[1] + 0x6ed9eba1, S31);
d = rotateLeft(d + H(a, b, c) + X[9] + 0x6ed9eba1, S32);
c = rotateLeft(c + H(d, a, b) + X[5] + 0x6ed9eba1, S33);
b = rotateLeft(b + H(c, d, a) + X[13] + 0x6ed9eba1, S34);
a = rotateLeft(a + H(b, c, d) + X[3] + 0x6ed9eba1, S31);
d = rotateLeft(d + H(a, b, c) + X[11] + 0x6ed9eba1, S32);
c = rotateLeft(c + H(d, a, b) + X[7] + 0x6ed9eba1, S33);
b = rotateLeft(b + H(c, d, a) + X[15] + 0x6ed9eba1, S34);
H1 += a;
H2 += b;
H3 += c;
H4 += d;
//
// reset the offset and clean out the word buffer.
//
xOff = 0;
for (int i = 0; i != X.length; i++) {
X[i] = 0;
}
}
}