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package org.bouncycastle.crypto.digests;
import org.bouncycastle.util.Memoable;
import org.bouncycastle.util.Pack;
/**
* FIPS 180-2 implementation of SHA-512.
*
* <pre>
* block word digest
* SHA-1 512 32 160
* SHA-256 512 32 256
* SHA-384 1024 64 384
* SHA-512 1024 64 512
* </pre>
*/
public class SHA512Digest
extends LongDigest
{
private static final int DIGEST_LENGTH = 64;
/**
* Standard constructor
*/
public SHA512Digest()
{
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public SHA512Digest(SHA512Digest t)
{
super(t);
}
public SHA512Digest(byte[] encodedState)
{
restoreState(encodedState);
}
public String getAlgorithmName()
{
return "SHA-512";
}
public int getDigestSize()
{
return DIGEST_LENGTH;
}
public int doFinal(
byte[] out,
int outOff)
{
finish();
Pack.longToBigEndian(H1, out, outOff);
Pack.longToBigEndian(H2, out, outOff + 8);
Pack.longToBigEndian(H3, out, outOff + 16);
Pack.longToBigEndian(H4, out, outOff + 24);
Pack.longToBigEndian(H5, out, outOff + 32);
Pack.longToBigEndian(H6, out, outOff + 40);
Pack.longToBigEndian(H7, out, outOff + 48);
Pack.longToBigEndian(H8, out, outOff + 56);
reset();
return DIGEST_LENGTH;
}
/**
* reset the chaining variables
*/
public void reset()
{
super.reset();
/* SHA-512 initial hash value
* The first 64 bits of the fractional parts of the square roots
* of the first eight prime numbers
*/
H1 = 0x6a09e667f3bcc908L;
H2 = 0xbb67ae8584caa73bL;
H3 = 0x3c6ef372fe94f82bL;
H4 = 0xa54ff53a5f1d36f1L;
H5 = 0x510e527fade682d1L;
H6 = 0x9b05688c2b3e6c1fL;
H7 = 0x1f83d9abfb41bd6bL;
H8 = 0x5be0cd19137e2179L;
}
public Memoable copy()
{
return new SHA512Digest(this);
}
public void reset(Memoable other)
{
SHA512Digest d = (SHA512Digest)other;
copyIn(d);
}
public byte[] getEncodedState()
{
byte[] encoded = new byte[getEncodedStateSize()];
super.populateState(encoded);
return encoded;
}
}
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