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package org.spongycastle.crypto.digests;
import org.spongycastle.util.Memoable;
import org.spongycastle.util.Pack;
/**
* FIPS 180-2 implementation of SHA-384.
*
* <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 SHA384Digest
extends LongDigest
{
private static final int DIGEST_LENGTH = 48;
/**
* Standard constructor
*/
public SHA384Digest()
{
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public SHA384Digest(SHA384Digest t)
{
super(t);
}
public SHA384Digest(byte[] encodedState)
{
restoreState(encodedState);
}
public String getAlgorithmName()
{
return "SHA-384";
}
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);
reset();
return DIGEST_LENGTH;
}
/**
* reset the chaining variables
*/
public void reset()
{
super.reset();
/* SHA-384 initial hash value
* The first 64 bits of the fractional parts of the square roots
* of the 9th through 16th prime numbers
*/
H1 = 0xcbbb9d5dc1059ed8l;
H2 = 0x629a292a367cd507l;
H3 = 0x9159015a3070dd17l;
H4 = 0x152fecd8f70e5939l;
H5 = 0x67332667ffc00b31l;
H6 = 0x8eb44a8768581511l;
H7 = 0xdb0c2e0d64f98fa7l;
H8 = 0x47b5481dbefa4fa4l;
}
public Memoable copy()
{
return new SHA384Digest(this);
}
public void reset(Memoable other)
{
SHA384Digest d = (SHA384Digest)other;
super.copyIn(d);
}
public byte[] getEncodedState()
{
byte[] encoded = new byte[getEncodedStateSize()];
super.populateState(encoded);
return encoded;
}
}
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