Class DSTU7564Mac

core/src/main/java/org/bouncycastle/crypto/macs/DSTU7564Mac.java:14–171

Implementation of DSTU7564 MAC mode

 * Implementation of DSTU7564 MAC mode
 */
public class DSTU7564Mac
    implements Mac
{
    private static final int BITS_IN_BYTE = 8;

    private DSTU7564Digest engine;

    private int macSize;

    private byte[] paddedKey;
    private byte[] invertedKey;

    private long inputLength;

    public DSTU7564Mac(int macBitSize)
    {
        /* Mac size can be only 256 / 384 / 512. Same as hash size for DSTU7654Digest */
        this.engine = new DSTU7564Digest(macBitSize);
        this.macSize = macBitSize / BITS_IN_BYTE;

        this.paddedKey = null;
        this.invertedKey = null;
    }

    public void init(CipherParameters params)
        throws IllegalArgumentException
    {
        paddedKey = null;
        reset();

        if (params instanceof KeyParameter)
        {
            byte[] key = ((KeyParameter)params).getKey();

            invertedKey = new byte[key.length];

            paddedKey = padKey(key);

            for (int byteIndex = 0; byteIndex < invertedKey.length; byteIndex++)
            {
                invertedKey[byteIndex] = (byte)(key[byteIndex] ^ (byte)0xFF);
            }
        }
        else
        {
            throw new IllegalArgumentException("Bad parameter passed");
        }

        engine.update(paddedKey, 0, paddedKey.length);
    }

    public String getAlgorithmName()
    {
        return "DSTU7564Mac";
    }

    public int getMacSize()
    {