1 files changed, 0 insertions, 246 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/engines/HC256Engine.java b/bcprov/src/main/java/org/bouncycastle/crypto/engines/HC256Engine.java
deleted file mode 100644
index a74164a..0000000
--- a/bcprov/src/main/java/org/bouncycastle/crypto/engines/HC256Engine.java
+++ /dev/null
@@ -1,246 +0,0 @@
-package org.bouncycastle.crypto.engines;
-
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.OutputLengthException;
-import org.bouncycastle.crypto.StreamCipher;
-import org.bouncycastle.crypto.params.KeyParameter;
-import org.bouncycastle.crypto.params.ParametersWithIV;
-
-/**
- * HC-256 is a software-efficient stream cipher created by Hongjun Wu. It 
- * generates keystream from a 256-bit secret key and a 256-bit initialization 
- * vector.
- * <p>
- * http://www.ecrypt.eu.org/stream/p3ciphers/hc/hc256_p3.pdf
- * </p><p>
- * Its brother, HC-128, is a third phase candidate in the eStream contest.
- * The algorithm is patent-free. No attacks are known as of today (April 2007). 
- * See
- * 
- * http://www.ecrypt.eu.org/stream/hcp3.html
- * </p>
- */
-public class HC256Engine
-    implements StreamCipher
-{
-    private int[] p = new int[1024];
-    private int[] q = new int[1024];
-    private int cnt = 0;
-
-    private int step()
-    {
-        int j = cnt & 0x3FF;
-        int ret;
-        if (cnt < 1024)
-        {
-            int x = p[(j - 3 & 0x3FF)];
-            int y = p[(j - 1023 & 0x3FF)];
-            p[j] += p[(j - 10 & 0x3FF)]
-                + (rotateRight(x, 10) ^ rotateRight(y, 23))
-                + q[((x ^ y) & 0x3FF)];
-
-            x = p[(j - 12 & 0x3FF)];
-            ret = (q[x & 0xFF] + q[((x >> 8) & 0xFF) + 256]
-                + q[((x >> 16) & 0xFF) + 512] + q[((x >> 24) & 0xFF) + 768])
-                ^ p[j];
-        }
-        else
-        {
-            int x = q[(j - 3 & 0x3FF)];
-            int y = q[(j - 1023 & 0x3FF)];
-            q[j] += q[(j - 10 & 0x3FF)]
-                + (rotateRight(x, 10) ^ rotateRight(y, 23))
-                + p[((x ^ y) & 0x3FF)];
-
-            x = q[(j - 12 & 0x3FF)];
-            ret = (p[x & 0xFF] + p[((x >> 8) & 0xFF) + 256]
-                + p[((x >> 16) & 0xFF) + 512] + p[((x >> 24) & 0xFF) + 768])
-                ^ q[j];
-        }
-        cnt = cnt + 1 & 0x7FF;
-        return ret;
-    }
-
-    private byte[] key, iv;
-    private boolean initialised;
-
-    private void init()
-    {
-        if (key.length != 32 && key.length != 16)
-        {
-            throw new IllegalArgumentException(
-                "The key must be 128/256 bits long");
-        }
-
-        if (iv.length < 16)
-        {
-            throw new IllegalArgumentException(
-                "The IV must be at least 128 bits long");
-        }
-
-        if (key.length != 32)
-        {
-            byte[] k = new byte[32];
-
-            System.arraycopy(key, 0, k, 0, key.length);
-            System.arraycopy(key, 0, k, 16, key.length);
-
-            key = k;
-        }
-
-        if (iv.length < 32)
-        {
-            byte[] newIV = new byte[32];
-
-            System.arraycopy(iv, 0, newIV, 0, iv.length);
-            System.arraycopy(iv, 0, newIV, iv.length, newIV.length - iv.length);
-
-            iv = newIV;
-        }
-
-        idx = 0;
-        cnt = 0;
-
-        int[] w = new int[2560];
-
-        for (int i = 0; i < 32; i++)
-        {
-            w[i >> 2] |= (key[i] & 0xff) << (8 * (i & 0x3));
-        }
-
-        for (int i = 0; i < 32; i++)
-        {
-            w[(i >> 2) + 8] |= (iv[i] & 0xff) << (8 * (i & 0x3));
-        }
-
-        for (int i = 16; i < 2560; i++)
-        {
-            int x = w[i - 2];
-            int y = w[i - 15];
-            w[i] = (rotateRight(x, 17) ^ rotateRight(x, 19) ^ (x >>> 10))
-                + w[i - 7]
-                + (rotateRight(y, 7) ^ rotateRight(y, 18) ^ (y >>> 3))
-                + w[i - 16] + i;
-        }
-
-        System.arraycopy(w, 512, p, 0, 1024);
-        System.arraycopy(w, 1536, q, 0, 1024);
-
-        for (int i = 0; i < 4096; i++)
-        {
-            step();
-        }
-
-        cnt = 0;
-    }
-
-    public String getAlgorithmName()
-    {
-        return "HC-256";
-    }
-
-    /**
-     * Initialise a HC-256 cipher.
-     *
-     * @param forEncryption whether or not we are for encryption. Irrelevant, as
-     *                      encryption and decryption are the same.
-     * @param params        the parameters required to set up the cipher.
-     * @throws IllegalArgumentException if the params argument is
-     *                                  inappropriate (ie. the key is not 256 bit long).
-     */
-    public void init(boolean forEncryption, CipherParameters params)
-        throws IllegalArgumentException
-    {
-        CipherParameters keyParam = params;
-
-        if (params instanceof ParametersWithIV)
-        {
-            iv = ((ParametersWithIV)params).getIV();
-            keyParam = ((ParametersWithIV)params).getParameters();
-        }
-        else
-        {
-            iv = new byte[0];
-        }
-
-        if (keyParam instanceof KeyParameter)
-        {
-            key = ((KeyParameter)keyParam).getKey();
-            init();
-        }
-        else
-        {
-            throw new IllegalArgumentException(
-                "Invalid parameter passed to HC256 init - "
-                    + params.getClass().getName());
-        }
-
-        initialised = true;
-    }
-
-    private byte[] buf = new byte[4];
-    private int idx = 0;
-
-    private byte getByte()
-    {
-        if (idx == 0)
-        {
-            int step = step();
-            buf[0] = (byte)(step & 0xFF);
-            step >>= 8;
-            buf[1] = (byte)(step & 0xFF);
-            step >>= 8;
-            buf[2] = (byte)(step & 0xFF);
-            step >>= 8;
-            buf[3] = (byte)(step & 0xFF);
-        }
-        byte ret = buf[idx];
-        idx = idx + 1 & 0x3;
-        return ret;
-    }
-
-    public int processBytes(byte[] in, int inOff, int len, byte[] out,
-                             int outOff) throws DataLengthException
-    {
-        if (!initialised)
-        {
-            throw new IllegalStateException(getAlgorithmName()
-                + " not initialised");
-        }
-
-        if ((inOff + len) > in.length)
-        {
-            throw new DataLengthException("input buffer too short");
-        }
-
-        if ((outOff + len) > out.length)
-        {
-            throw new OutputLengthException("output buffer too short");
-        }
-
-        for (int i = 0; i < len; i++)
-        {
-            out[outOff + i] = (byte)(in[inOff + i] ^ getByte());
-        }
-
-        return len;
-    }
-
-    public void reset()
-    {
-        init();
-    }
-
-    public byte returnByte(byte in)
-    {
-        return (byte)(in ^ getByte());
-    }
-
-    private static int rotateRight(
-        int     x,
-        int     bits)
-    {
-        return (x >>> bits) | (x << -bits);
-    }
-}