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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.
package org.bouncycastle.crypto.digests;
/**
* SHA-224 as described in RFC 3874
*
* block word digest
* SHA-1 512 32 160
* SHA-224 512 32 224
* SHA-256 512 32 256
* SHA-384 1024 64 384
* SHA-512 1024 64 512
*
*/
public class SHA224Digest
extends GeneralDigest
{
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()
{
reset();
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public SHA224Digest(SHA224Digest t)
{
super(t);
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)
{
X[xOff++] = ((in[inOff] & 0xff) << 24) | ((in[inOff + 1] & 0xff) << 16)
| ((in[inOff + 2] & 0xff) << 8) | ((in[inOff + 3] & 0xff));
if (xOff == 16)
{
processBlock();
}
}
private void unpackWord(
int word,
byte[] out,
int outOff)
{
out[outOff] = (byte)(word >>> 24);
out[outOff + 1] = (byte)(word >>> 16);
out[outOff + 2] = (byte)(word >>> 8);
out[outOff + 3] = (byte)word;
}
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();
unpackWord(H1, out, outOff);
unpackWord(H2, out, outOff + 4);
unpackWord(H3, out, outOff + 8);
unpackWord(H4, out, outOff + 12);
unpackWord(H5, out, outOff + 16);
unpackWord(H6, out, outOff + 20);
unpackWord(H7, out, outOff + 24);
reset();
return DIGEST_LENGTH;
}
/**
* reset the chaining variables
*/
public void reset()
{
super.reset();
/* 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;
for (int t = 0; t <= 63; t++)
{
int T1, T2;
T1 = h + Sum1(e) + Ch(e, f, g) + K[t] + X[t];
T2 = Sum0(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}
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 != X.length; i++)
{
X[i] = 0;
}
}
private int rotateRight(
int x,
int n)
{
return (x >>> n) | (x << (32 - n));
}
/* 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 rotateRight(x, 2) ^ rotateRight(x, 13) ^ rotateRight(x, 22);
}
private int Sum1(
int x)
{
return rotateRight(x, 6) ^ rotateRight(x, 11) ^ rotateRight(x, 25);
}
private int Theta0(
int x)
{
return rotateRight(x, 7) ^ rotateRight(x, 18) ^ (x >>> 3);
}
private int Theta1(
int x)
{
return rotateRight(x, 17) ^ rotateRight(x, 19) ^ (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
};
}