1 files changed, 0 insertions, 219 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/ISAACEngine.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/ISAACEngine.java
deleted file mode 100644
index 5c15db1d1..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/engines/ISAACEngine.java
+++ /dev/null
@@ -1,219 +0,0 @@
-package org.spongycastle.crypto.engines;
-
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.DataLengthException;
-import org.spongycastle.crypto.OutputLengthException;
-import org.spongycastle.crypto.StreamCipher;
-import org.spongycastle.crypto.params.KeyParameter;
-import org.spongycastle.crypto.util.Pack;
-
-/**
- * Implementation of Bob Jenkin's ISAAC (Indirection Shift Accumulate Add and Count).
- * see: http://www.burtleburtle.net/bob/rand/isaacafa.html
-*/
-public class ISAACEngine
-    implements StreamCipher
-{
-    // Constants
-    private final int sizeL          = 8,
-                      stateArraySize = sizeL<<5; // 256
-    
-    // Cipher's internal state
-    private int[]   engineState   = null, // mm                
-                    results       = null; // randrsl
-    private int     a = 0, b = 0, c = 0;
-    
-    // Engine state
-    private int     index         = 0;
-    private byte[]  keyStream     = new byte[stateArraySize<<2], // results expanded into bytes
-                    workingKey    = null;
-    private boolean initialised   = false;
-    
-    /**
-     * initialise an ISAAC cipher.
-     *
-     * @param forEncryption whether or not we are for encryption.
-     * @param params the parameters required to set up the cipher.
-     * @exception IllegalArgumentException if the params argument is
-     * inappropriate.
-     */
-    public void init(
-        boolean             forEncryption, 
-        CipherParameters    params)
-    {
-        if (!(params instanceof KeyParameter))
-        {
-            throw new IllegalArgumentException("invalid parameter passed to ISAAC init - " + params.getClass().getName());
-        }
-        /* 
-         * ISAAC encryption and decryption is completely
-         * symmetrical, so the 'forEncryption' is 
-         * irrelevant.
-         */
-        KeyParameter p = (KeyParameter)params;
-        setKey(p.getKey());
-        
-        return;
-    }
-                    
-    public byte returnByte(byte in)
-    {
-        if (index == 0) 
-        {
-            isaac();
-            keyStream = Pack.intToBigEndian(results);
-        }
-        byte out = (byte)(keyStream[index]^in);
-        index = (index + 1) & 1023;
-        
-        return out;
-    }
-    
-    public void processBytes(
-        byte[]  in, 
-        int     inOff, 
-        int     len, 
-        byte[]  out, 
-        int     outOff)
-    {
-        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++)
-        {
-            if (index == 0) 
-            {
-                isaac();
-                keyStream = Pack.intToBigEndian(results);
-            }
-            out[i+outOff] = (byte)(keyStream[index]^in[i+inOff]);
-            index = (index + 1) & 1023;
-        }
-    }
-    
-    public String getAlgorithmName()
-    {
-        return "ISAAC";
-    }
-    
-    public void reset()
-    {
-        setKey(workingKey);
-    }
-    
-    // Private implementation
-    private void setKey(byte[] keyBytes)
-    {
-        workingKey = keyBytes;
-        
-        if (engineState == null)
-        {
-            engineState = new int[stateArraySize];
-        }
-        
-        if (results == null)
-        {
-            results = new int[stateArraySize];
-        }
-        
-        int i, j, k;
-        
-        // Reset state
-        for (i = 0; i < stateArraySize; i++)
-        {
-            engineState[i] = results[i] = 0;
-        }
-        a = b = c = 0;
-        
-        // Reset index counter for output
-        index = 0;
-        
-        // Convert the key bytes to ints and put them into results[] for initialization
-        byte[] t = new byte[keyBytes.length + (keyBytes.length & 3)];
-        System.arraycopy(keyBytes, 0, t, 0, keyBytes.length);
-        for (i = 0; i < t.length; i+=4)
-        {
-            results[i >>> 2] = Pack.littleEndianToInt(t, i);
-        }
-
-        // It has begun?
-        int[] abcdefgh = new int[sizeL];
-        
-        for (i = 0; i < sizeL; i++)
-        {
-            abcdefgh[i] = 0x9e3779b9; // Phi (golden ratio)
-        }
-        
-        for (i = 0; i < 4; i++)
-        {
-            mix(abcdefgh);
-        }
-        
-        for (i = 0; i < 2; i++)
-        {
-            for (j = 0; j < stateArraySize; j+=sizeL)
-            {
-                for (k = 0; k < sizeL; k++)
-                {
-                    abcdefgh[k] += (i<1) ? results[j+k] : engineState[j+k];
-                }
-                
-                mix(abcdefgh);
-                
-                for (k = 0; k < sizeL; k++)
-                {
-                    engineState[j+k] = abcdefgh[k];
-                }
-            }
-        }
-        
-        isaac();
-        
-        initialised = true;
-    }    
-    
-    private void isaac()
-    {
-        int i, x, y;
-        
-        b += ++c;
-        for (i = 0; i < stateArraySize; i++)
-        {
-            x = engineState[i];
-            switch (i & 3)
-            {
-                case 0: a ^= (a <<  13); break;
-                case 1: a ^= (a >>>  6); break;
-                case 2: a ^= (a <<   2); break;
-                case 3: a ^= (a >>> 16); break;
-            }
-            a += engineState[(i+128) & 0xFF];
-            engineState[i] = y = engineState[(x >>> 2) & 0xFF] + a + b;
-            results[i] = b = engineState[(y >>> 10) & 0xFF] + x;
-        }
-    }
-    
-    private void mix(int[] x)
-    {
-        x[0]^=x[1]<< 11; x[3]+=x[0]; x[1]+=x[2];
-        x[1]^=x[2]>>> 2; x[4]+=x[1]; x[2]+=x[3];
-        x[2]^=x[3]<<  8; x[5]+=x[2]; x[3]+=x[4];
-        x[3]^=x[4]>>>16; x[6]+=x[3]; x[4]+=x[5];
-        x[4]^=x[5]<< 10; x[7]+=x[4]; x[5]+=x[6];
-        x[5]^=x[6]>>> 4; x[0]+=x[5]; x[6]+=x[7];
-        x[6]^=x[7]<<  8; x[1]+=x[6]; x[7]+=x[0];
-        x[7]^=x[0]>>> 9; x[2]+=x[7]; x[0]+=x[1];
-    }
-}