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package org.spongycastle.crypto.digests;
import org.spongycastle.util.Memoable;
import org.spongycastle.util.MemoableResetException;
import org.spongycastle.util.Pack;
/**
* FIPS 180-4 implementation of SHA-512/t
*/
public class SHA512tDigest
extends LongDigest
{
private int digestLength; // non-final due to old flow analyser.
private long H1t, H2t, H3t, H4t, H5t, H6t, H7t, H8t;
/**
* Standard constructor
*/
public SHA512tDigest(int bitLength)
{
if (bitLength >= 512)
{
throw new IllegalArgumentException("bitLength cannot be >= 512");
}
if (bitLength % 8 != 0)
{
throw new IllegalArgumentException("bitLength needs to be a multiple of 8");
}
if (bitLength == 384)
{
throw new IllegalArgumentException("bitLength cannot be 384 use SHA384 instead");
}
this.digestLength = bitLength / 8;
tIvGenerate(digestLength * 8);
reset();
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public SHA512tDigest(SHA512tDigest t)
{
super(t);
this.digestLength = t.digestLength;
reset(t);
}
public SHA512tDigest(byte[] encodedState)
{
this(readDigestLength(encodedState));
restoreState(encodedState);
}
private static int readDigestLength(byte[] encodedState)
{
return Pack.bigEndianToInt(encodedState, encodedState.length - 4);
}
public String getAlgorithmName()
{
return "SHA-512/" + Integer.toString(digestLength * 8);
}
public int getDigestSize()
{
return digestLength;
}
public int doFinal(
byte[] out,
int outOff)
{
finish();
longToBigEndian(H1, out, outOff, digestLength);
longToBigEndian(H2, out, outOff + 8, digestLength - 8);
longToBigEndian(H3, out, outOff + 16, digestLength - 16);
longToBigEndian(H4, out, outOff + 24, digestLength - 24);
longToBigEndian(H5, out, outOff + 32, digestLength - 32);
longToBigEndian(H6, out, outOff + 40, digestLength - 40);
longToBigEndian(H7, out, outOff + 48, digestLength - 48);
longToBigEndian(H8, out, outOff + 56, digestLength - 56);
reset();
return digestLength;
}
/**
* reset the chaining variables
*/
public void reset()
{
super.reset();
/*
* initial hash values use the iv generation algorithm for t.
*/
H1 = H1t;
H2 = H2t;
H3 = H3t;
H4 = H4t;
H5 = H5t;
H6 = H6t;
H7 = H7t;
H8 = H8t;
}
private void tIvGenerate(int bitLength)
{
H1 = 0x6a09e667f3bcc908L ^ 0xa5a5a5a5a5a5a5a5L;
H2 = 0xbb67ae8584caa73bL ^ 0xa5a5a5a5a5a5a5a5L;
H3 = 0x3c6ef372fe94f82bL ^ 0xa5a5a5a5a5a5a5a5L;
H4 = 0xa54ff53a5f1d36f1L ^ 0xa5a5a5a5a5a5a5a5L;
H5 = 0x510e527fade682d1L ^ 0xa5a5a5a5a5a5a5a5L;
H6 = 0x9b05688c2b3e6c1fL ^ 0xa5a5a5a5a5a5a5a5L;
H7 = 0x1f83d9abfb41bd6bL ^ 0xa5a5a5a5a5a5a5a5L;
H8 = 0x5be0cd19137e2179L ^ 0xa5a5a5a5a5a5a5a5L;
update((byte)0x53);
update((byte)0x48);
update((byte)0x41);
update((byte)0x2D);
update((byte)0x35);
update((byte)0x31);
update((byte)0x32);
update((byte)0x2F);
if (bitLength > 100)
{
update((byte)(bitLength / 100 + 0x30));
bitLength = bitLength % 100;
update((byte)(bitLength / 10 + 0x30));
bitLength = bitLength % 10;
update((byte)(bitLength + 0x30));
}
else if (bitLength > 10)
{
update((byte)(bitLength / 10 + 0x30));
bitLength = bitLength % 10;
update((byte)(bitLength + 0x30));
}
else
{
update((byte)(bitLength + 0x30));
}
finish();
H1t = H1;
H2t = H2;
H3t = H3;
H4t = H4;
H5t = H5;
H6t = H6;
H7t = H7;
H8t = H8;
}
private static void longToBigEndian(long n, byte[] bs, int off, int max)
{
if (max > 0)
{
intToBigEndian((int)(n >>> 32), bs, off, max);
if (max > 4)
{
intToBigEndian((int)(n & 0xffffffffL), bs, off + 4, max - 4);
}
}
}
private static void intToBigEndian(int n, byte[] bs, int off, int max)
{
int num = Math.min(4, max);
while (--num >= 0)
{
int shift = 8 * (3 - num);
bs[off + num] = (byte)(n >>> shift);
}
}
public Memoable copy()
{
return new SHA512tDigest(this);
}
public void reset(Memoable other)
{
SHA512tDigest t = (SHA512tDigest)other;
if (this.digestLength != t.digestLength)
{
throw new MemoableResetException("digestLength inappropriate in other");
}
super.copyIn(t);
this.H1t = t.H1t;
this.H2t = t.H2t;
this.H3t = t.H3t;
this.H4t = t.H4t;
this.H5t = t.H5t;
this.H6t = t.H6t;
this.H7t = t.H7t;
this.H8t = t.H8t;
}
public byte[] getEncodedState()
{
final int baseSize = getEncodedStateSize();
byte[] encoded = new byte[baseSize + 4];
populateState(encoded);
Pack.intToBigEndian(digestLength * 8, encoded, baseSize);
return encoded;
}
}
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