org.bouncycastle.crypto.digests.KeccakDigest Maven / Gradle / Ivy
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package org.bouncycastle.crypto.digests;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Pack;
/**
* implementation of Keccak based on following KeccakNISTInterface.c from http://keccak.noekeon.org/
*
* Following the naming conventions used in the C source code to enable easy review of the implementation.
*/
public class KeccakDigest
implements ExtendedDigest
{
private static long[] KeccakRoundConstants = new long[]{ 0x0000000000000001L, 0x0000000000008082L,
0x800000000000808aL, 0x8000000080008000L, 0x000000000000808bL, 0x0000000080000001L, 0x8000000080008081L,
0x8000000000008009L, 0x000000000000008aL, 0x0000000000000088L, 0x0000000080008009L, 0x000000008000000aL,
0x000000008000808bL, 0x800000000000008bL, 0x8000000000008089L, 0x8000000000008003L, 0x8000000000008002L,
0x8000000000000080L, 0x000000000000800aL, 0x800000008000000aL, 0x8000000080008081L, 0x8000000000008080L,
0x0000000080000001L, 0x8000000080008008L };
protected long[] state = new long[25];
protected byte[] dataQueue = new byte[192];
protected int rate;
protected int bitsInQueue;
protected int fixedOutputLength;
protected boolean squeezing;
public KeccakDigest()
{
this(288);
}
public KeccakDigest(int bitLength)
{
init(bitLength);
}
public KeccakDigest(KeccakDigest source)
{
System.arraycopy(source.state, 0, this.state, 0, source.state.length);
System.arraycopy(source.dataQueue, 0, this.dataQueue, 0, source.dataQueue.length);
this.rate = source.rate;
this.bitsInQueue = source.bitsInQueue;
this.fixedOutputLength = source.fixedOutputLength;
this.squeezing = source.squeezing;
}
public String getAlgorithmName()
{
return "Keccak-" + fixedOutputLength;
}
public int getDigestSize()
{
return fixedOutputLength / 8;
}
public void update(byte in)
{
absorb(new byte[]{ in }, 0, 1);
}
public void update(byte[] in, int inOff, int len)
{
absorb(in, inOff, len);
}
public int doFinal(byte[] out, int outOff)
{
squeeze(out, outOff, fixedOutputLength);
reset();
return getDigestSize();
}
/*
* TODO Possible API change to support partial-byte suffixes.
*/
protected int doFinal(byte[] out, int outOff, byte partialByte, int partialBits)
{
if (partialBits > 0)
{
absorbBits(partialByte, partialBits);
}
squeeze(out, outOff, fixedOutputLength);
reset();
return getDigestSize();
}
public void reset()
{
init(fixedOutputLength);
}
/**
* Return the size of block that the compression function is applied to in bytes.
*
* @return internal byte length of a block.
*/
public int getByteLength()
{
return rate / 8;
}
private void init(int bitLength)
{
switch (bitLength)
{
case 128:
case 224:
case 256:
case 288:
case 384:
case 512:
initSponge(1600 - (bitLength << 1));
break;
default:
throw new IllegalArgumentException("bitLength must be one of 128, 224, 256, 288, 384, or 512.");
}
}
private void initSponge(int rate)
{
if ((rate <= 0) || (rate >= 1600) || ((rate % 64) != 0))
{
throw new IllegalStateException("invalid rate value");
}
this.rate = rate;
for (int i = 0; i < state.length; ++i)
{
state[i] = 0L;
}
Arrays.fill(this.dataQueue, (byte)0);
this.bitsInQueue = 0;
this.squeezing = false;
this.fixedOutputLength = (1600 - rate) / 2;
}
protected void absorb(byte[] data, int off, int len)
{
if ((bitsInQueue % 8) != 0)
{
throw new IllegalStateException("attempt to absorb with odd length queue");
}
if (squeezing)
{
throw new IllegalStateException("attempt to absorb while squeezing");
}
int bytesInQueue = bitsInQueue >> 3;
int rateBytes = rate >> 3;
int count = 0;
while (count < len)
{
if (bytesInQueue == 0 && count <= (len - rateBytes))
{
do
{
KeccakAbsorb(data, off + count);
count += rateBytes;
}
while (count <= (len - rateBytes));
}
else
{
int partialBlock = Math.min(rateBytes - bytesInQueue, len - count);
System.arraycopy(data, off + count, dataQueue, bytesInQueue, partialBlock);
bytesInQueue += partialBlock;
count += partialBlock;
if (bytesInQueue == rateBytes)
{
KeccakAbsorb(dataQueue, 0);
bytesInQueue = 0;
}
}
}
bitsInQueue = bytesInQueue << 3;
}
protected void absorbBits(int data, int bits)
{
if (bits < 1 || bits > 7)
{
throw new IllegalArgumentException("'bits' must be in the range 1 to 7");
}
if ((bitsInQueue % 8) != 0)
{
throw new IllegalStateException("attempt to absorb with odd length queue");
}
if (squeezing)
{
throw new IllegalStateException("attempt to absorb while squeezing");
}
int mask = (1 << bits) - 1;
dataQueue[bitsInQueue >> 3] = (byte)(data & mask);
// NOTE: After this, bitsInQueue is no longer a multiple of 8, so no more absorbs will work
bitsInQueue += bits;
}
private void padAndSwitchToSqueezingPhase()
{
dataQueue[bitsInQueue >> 3] |= (byte)(1L << (bitsInQueue & 7));
if (++bitsInQueue == rate)
{
KeccakAbsorb(dataQueue, 0);
bitsInQueue = 0;
}
{
int full = bitsInQueue >> 6, partial = bitsInQueue & 63;
int off = 0;
for (int i = 0; i < full; ++i)
{
state[i] ^= Pack.littleEndianToLong(dataQueue, off);
off += 8;
}
if (partial > 0)
{
long mask = (1L << partial) - 1L;
state[full] ^= Pack.littleEndianToLong(dataQueue, off) & mask;
}
state[(rate - 1) >> 6] ^= (1L << 63);
}
KeccakPermutation();
KeccakExtract();
bitsInQueue = rate;
squeezing = true;
}
protected void squeeze(byte[] output, int offset, long outputLength)
{
if (!squeezing)
{
padAndSwitchToSqueezingPhase();
}
if ((outputLength % 8) != 0)
{
throw new IllegalStateException("outputLength not a multiple of 8");
}
long i = 0;
while (i < outputLength)
{
if (bitsInQueue == 0)
{
KeccakPermutation();
KeccakExtract();
bitsInQueue = rate;
}
int partialBlock = (int)Math.min((long)bitsInQueue, outputLength - i);
System.arraycopy(dataQueue, (rate - bitsInQueue) / 8, output, offset + (int)(i / 8), partialBlock / 8);
bitsInQueue -= partialBlock;
i += partialBlock;
}
}
private void KeccakAbsorb(byte[] data, int off)
{
int count = rate >> 6;
for (int i = 0; i < count; ++i)
{
state[i] ^= Pack.littleEndianToLong(data, off);
off += 8;
}
KeccakPermutation();
}
private void KeccakExtract()
{
Pack.longToLittleEndian(state, 0, rate >> 6, dataQueue, 0);
}
private void KeccakPermutation()
{
long[] A = state;
long a00 = A[ 0], a01 = A[ 1], a02 = A[ 2], a03 = A[ 3], a04 = A[ 4];
long a05 = A[ 5], a06 = A[ 6], a07 = A[ 7], a08 = A[ 8], a09 = A[ 9];
long a10 = A[10], a11 = A[11], a12 = A[12], a13 = A[13], a14 = A[14];
long a15 = A[15], a16 = A[16], a17 = A[17], a18 = A[18], a19 = A[19];
long a20 = A[20], a21 = A[21], a22 = A[22], a23 = A[23], a24 = A[24];
for (int i = 0; i < 24; i++)
{
// theta
long c0 = a00 ^ a05 ^ a10 ^ a15 ^ a20;
long c1 = a01 ^ a06 ^ a11 ^ a16 ^ a21;
long c2 = a02 ^ a07 ^ a12 ^ a17 ^ a22;
long c3 = a03 ^ a08 ^ a13 ^ a18 ^ a23;
long c4 = a04 ^ a09 ^ a14 ^ a19 ^ a24;
long d1 = (c1 << 1 | c1 >>> -1) ^ c4;
long d2 = (c2 << 1 | c2 >>> -1) ^ c0;
long d3 = (c3 << 1 | c3 >>> -1) ^ c1;
long d4 = (c4 << 1 | c4 >>> -1) ^ c2;
long d0 = (c0 << 1 | c0 >>> -1) ^ c3;
a00 ^= d1; a05 ^= d1; a10 ^= d1; a15 ^= d1; a20 ^= d1;
a01 ^= d2; a06 ^= d2; a11 ^= d2; a16 ^= d2; a21 ^= d2;
a02 ^= d3; a07 ^= d3; a12 ^= d3; a17 ^= d3; a22 ^= d3;
a03 ^= d4; a08 ^= d4; a13 ^= d4; a18 ^= d4; a23 ^= d4;
a04 ^= d0; a09 ^= d0; a14 ^= d0; a19 ^= d0; a24 ^= d0;
// rho/pi
c1 = a01 << 1 | a01 >>> 63;
a01 = a06 << 44 | a06 >>> 20;
a06 = a09 << 20 | a09 >>> 44;
a09 = a22 << 61 | a22 >>> 3;
a22 = a14 << 39 | a14 >>> 25;
a14 = a20 << 18 | a20 >>> 46;
a20 = a02 << 62 | a02 >>> 2;
a02 = a12 << 43 | a12 >>> 21;
a12 = a13 << 25 | a13 >>> 39;
a13 = a19 << 8 | a19 >>> 56;
a19 = a23 << 56 | a23 >>> 8;
a23 = a15 << 41 | a15 >>> 23;
a15 = a04 << 27 | a04 >>> 37;
a04 = a24 << 14 | a24 >>> 50;
a24 = a21 << 2 | a21 >>> 62;
a21 = a08 << 55 | a08 >>> 9;
a08 = a16 << 45 | a16 >>> 19;
a16 = a05 << 36 | a05 >>> 28;
a05 = a03 << 28 | a03 >>> 36;
a03 = a18 << 21 | a18 >>> 43;
a18 = a17 << 15 | a17 >>> 49;
a17 = a11 << 10 | a11 >>> 54;
a11 = a07 << 6 | a07 >>> 58;
a07 = a10 << 3 | a10 >>> 61;
a10 = c1;
// chi
c0 = a00 ^ (~a01 & a02);
c1 = a01 ^ (~a02 & a03);
a02 ^= ~a03 & a04;
a03 ^= ~a04 & a00;
a04 ^= ~a00 & a01;
a00 = c0;
a01 = c1;
c0 = a05 ^ (~a06 & a07);
c1 = a06 ^ (~a07 & a08);
a07 ^= ~a08 & a09;
a08 ^= ~a09 & a05;
a09 ^= ~a05 & a06;
a05 = c0;
a06 = c1;
c0 = a10 ^ (~a11 & a12);
c1 = a11 ^ (~a12 & a13);
a12 ^= ~a13 & a14;
a13 ^= ~a14 & a10;
a14 ^= ~a10 & a11;
a10 = c0;
a11 = c1;
c0 = a15 ^ (~a16 & a17);
c1 = a16 ^ (~a17 & a18);
a17 ^= ~a18 & a19;
a18 ^= ~a19 & a15;
a19 ^= ~a15 & a16;
a15 = c0;
a16 = c1;
c0 = a20 ^ (~a21 & a22);
c1 = a21 ^ (~a22 & a23);
a22 ^= ~a23 & a24;
a23 ^= ~a24 & a20;
a24 ^= ~a20 & a21;
a20 = c0;
a21 = c1;
// iota
a00 ^= KeccakRoundConstants[i];
}
A[ 0] = a00; A[ 1] = a01; A[ 2] = a02; A[ 3] = a03; A[ 4] = a04;
A[ 5] = a05; A[ 6] = a06; A[ 7] = a07; A[ 8] = a08; A[ 9] = a09;
A[10] = a10; A[11] = a11; A[12] = a12; A[13] = a13; A[14] = a14;
A[15] = a15; A[16] = a16; A[17] = a17; A[18] = a18; A[19] = a19;
A[20] = a20; A[21] = a21; A[22] = a22; A[23] = a23; A[24] = a24;
}
}