Class LongDigest

core/src/main/java/org/bouncycastle/crypto/digests/LongDigest.java:12–426

Base class for SHA-384 and SHA-512.

 * Base class for SHA-384 and SHA-512.
 */
public abstract class LongDigest
    implements ExtendedDigest, Memoable, EncodableDigest
{
    private static final int BYTE_LENGTH = 128;

    protected final CryptoServicePurpose purpose;

    private byte[] xBuf = new byte[8];
    private int     xBufOff;

    private long    byteCount1;
    private long    byteCount2;

    protected long    H1, H2, H3, H4, H5, H6, H7, H8;

    private long[]  W = new long[80];
    private int     wOff;

    /**
     * Constructor for variable length word
     */
    protected LongDigest()
    {
        this(CryptoServicePurpose.ANY);
    }

    /**
     * Constructor for variable length word
     */
    protected LongDigest(CryptoServicePurpose purpose)
    {
        this.purpose = purpose;

        xBufOff = 0;

        reset();
    }

    /**
     * Copy constructor.  We are using copy constructors in place
     * of the Object.clone() interface as this interface is not
     * supported by J2ME.
     */
    protected LongDigest(LongDigest t)
    {
        this.purpose = t.purpose;

        copyIn(t);
    }

    protected void copyIn(LongDigest t)
    {
        System.arraycopy(t.xBuf, 0, xBuf, 0, t.xBuf.length);

        xBufOff = t.xBufOff;
        byteCount1 = t.byteCount1;
        byteCount2 = t.byteCount2;