X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fbouncycastle%2Fcrypto%2Fengines%2FRC4Engine.java;fp=src%2Forg%2Fbouncycastle%2Fcrypto%2Fengines%2FRC4Engine.java;h=0000000000000000000000000000000000000000;hb=4daeeb4119b901d53b44913c86f8af3ce67db925;hp=0adc923a8c9f65681b9082bb240b10bdf12e781c;hpb=da1f843588c8bd2b2c7cc74a5b4ffff8d57ab712;p=org.ibex.core.git

diff --git a/src/org/bouncycastle/crypto/engines/RC4Engine.java b/src/org/bouncycastle/crypto/engines/RC4Engine.java
deleted file mode 100644
index 0adc923..0000000
--- a/src/org/bouncycastle/crypto/engines/RC4Engine.java
+++ /dev/null
@@ -1,144 +0,0 @@
-package org.bouncycastle.crypto.engines;
-
-import org.bouncycastle.crypto.StreamCipher;
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.params.KeyParameter;
-
-public class RC4Engine implements StreamCipher
-{
-    private final static int STATE_LENGTH = 256;
-
-    /*
-     * variables to hold the state of the RC4 engine
-     * during encryption and decryption
-     */
-
-    private byte[]      engineState = null;
-    private int         x = 0;
-    private int         y = 0;
-    private byte[]      workingKey = null;
-
-    /**
-     * initialise a RC4 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)
-        {
-            /* 
-             * RC4 encryption and decryption is completely
-             * symmetrical, so the 'forEncryption' is 
-             * irrelevant.
-             */
-            workingKey = ((KeyParameter)params).getKey();
-            setKey(workingKey);
-
-            return;
-        }
-
-        throw new IllegalArgumentException("invalid parameter passed to RC4 init - " + params.getClass().getName());
-    }
-
-    public String getAlgorithmName()
-    {
-        return "RC4";
-    }
-
-    public byte returnByte(byte in)
-    {
-        x = (x + 1) & 0xff;
-        y = (engineState[x] + y) & 0xff;
-
-        // swap
-        byte tmp = engineState[x];
-        engineState[x] = engineState[y];
-        engineState[y] = tmp;
-
-        // xor
-        return (byte)(in ^ engineState[(engineState[x] + engineState[y]) & 0xff]);
-    }
-
-    public void processBytes(
-        byte[]     in, 
-        int     inOff, 
-        int     len, 
-        byte[]     out, 
-        int     outOff
-    )
-    {
-        if ((inOff + len) > in.length)
-        {
-            throw new DataLengthException("input buffer too short");
-        }
-
-        if ((outOff + len) > out.length)
-        {
-            throw new DataLengthException("output buffer too short");
-        }
-
-        for (int i = 0; i < len ; i++)
-        {
-            x = (x + 1) & 0xff;
-            y = (engineState[x] + y) & 0xff;
-
-            // swap
-            byte tmp = engineState[x];
-            engineState[x] = engineState[y];
-            engineState[y] = tmp;
-
-            // xor
-            out[i+outOff] = (byte)(in[i + inOff]
-                    ^ engineState[(engineState[x] + engineState[y]) & 0xff]);
-        }
-    }
-
-    public void reset()
-    {
-        setKey(workingKey);
-    }
-
-    // Private implementation
-
-    private void setKey(byte[] keyBytes)
-    {
-        workingKey = keyBytes;
-
-        // System.out.println("the key length is ; "+ workingKey.length);
-
-        x = 0;
-        y = 0;
-
-        if (engineState == null)
-        {
-            engineState = new byte[STATE_LENGTH];
-        }
-
-        // reset the state of the engine
-        for (int i=0; i < STATE_LENGTH; i++)
-        {
-            engineState[i] = (byte)i;
-        }
-        
-        int i1 = 0;
-        int i2 = 0;
-
-        for (int i=0; i < STATE_LENGTH; i++)
-        {
-            i2 = ((keyBytes[i1] & 0xff) + engineState[i] + i2) & 0xff;
-            // do the byte-swap inline
-            byte tmp = engineState[i];
-            engineState[i] = engineState[i2];
-            engineState[i2] = tmp;
-            i1 = (i1+1) % keyBytes.length; 
-        }
-    }
-}