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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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-384.
 *
 *  *         block  word  digest
 * SHA-1   512    32    160
 * SHA-256 512    32    256
 * SHA-384 1024   64    384
 * SHA-512 1024   64    512
 * 
 */
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);
    }

    /**
     * State constructor - create a digest initialised with the state of a previous one.
     *
     * @param encodedState the encoded state from the originating digest.
     */
    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;
    }
}