1 files changed, 0 insertions, 187 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/modes/OFBBlockCipher.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/modes/OFBBlockCipher.java
deleted file mode 100644
index 3756c7f13..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/modes/OFBBlockCipher.java
+++ /dev/null
@@ -1,187 +0,0 @@
-package org.spongycastle.crypto.modes;
-
-import org.spongycastle.crypto.BlockCipher;
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.DataLengthException;
-import org.spongycastle.crypto.params.ParametersWithIV;
-
-/**
- * implements a Output-FeedBack (OFB) mode on top of a simple cipher.
- */
-public class OFBBlockCipher
-    implements BlockCipher
-{
-    private byte[]          IV;
-    private byte[]          ofbV;
-    private byte[]          ofbOutV;
-
-    private final int             blockSize;
-    private final BlockCipher     cipher;
-
-    /**
-     * Basic constructor.
-     *
-     * @param cipher the block cipher to be used as the basis of the
-     * feedback mode.
-     * @param blockSize the block size in bits (note: a multiple of 8)
-     */
-    public OFBBlockCipher(
-        BlockCipher cipher,
-        int         blockSize)
-    {
-        this.cipher = cipher;
-        this.blockSize = blockSize / 8;
-
-        this.IV = new byte[cipher.getBlockSize()];
-        this.ofbV = new byte[cipher.getBlockSize()];
-        this.ofbOutV = new byte[cipher.getBlockSize()];
-    }
-
-    /**
-     * return the underlying block cipher that we are wrapping.
-     *
-     * @return the underlying block cipher that we are wrapping.
-     */
-    public BlockCipher getUnderlyingCipher()
-    {
-        return cipher;
-    }
-
-    /**
-     * Initialise the cipher and, possibly, the initialisation vector (IV).
-     * If an IV isn't passed as part of the parameter, the IV will be all zeros.
-     * An IV which is too short is handled in FIPS compliant fashion.
-     *
-     * @param encrypting if true the cipher is initialised for
-     *  encryption, if false for decryption.
-     * @param params the key and other data required by the cipher.
-     * @exception IllegalArgumentException if the params argument is
-     * inappropriate.
-     */
-    public void init(
-        boolean             encrypting, //ignored by this OFB mode
-        CipherParameters    params)
-        throws IllegalArgumentException
-    {
-        if (params instanceof ParametersWithIV)
-        {
-            ParametersWithIV ivParam = (ParametersWithIV)params;
-            byte[]      iv = ivParam.getIV();
-
-            if (iv.length < IV.length)
-            {
-                // prepend the supplied IV with zeros (per FIPS PUB 81)
-                System.arraycopy(iv, 0, IV, IV.length - iv.length, iv.length); 
-                for (int i = 0; i < IV.length - iv.length; i++)
-                {
-                    IV[i] = 0;
-                }
-            }
-            else
-            {
-                System.arraycopy(iv, 0, IV, 0, IV.length);
-            }
-
-            reset();
-
-            // if null it's an IV changed only.
-            if (ivParam.getParameters() != null)
-            {
-                cipher.init(true, ivParam.getParameters());
-            }
-        }
-        else
-        {
-            reset();
-
-            // if it's null, key is to be reused.
-            if (params != null)
-            {
-                cipher.init(true, params);
-            }
-        }
-    }
-
-    /**
-     * return the algorithm name and mode.
-     *
-     * @return the name of the underlying algorithm followed by "/OFB"
-     * and the block size in bits
-     */
-    public String getAlgorithmName()
-    {
-        return cipher.getAlgorithmName() + "/OFB" + (blockSize * 8);
-    }
-
-    
-    /**
-     * return the block size we are operating at (in bytes).
-     *
-     * @return the block size we are operating at (in bytes).
-     */
-    public int getBlockSize()
-    {
-        return blockSize;
-    }
-
-    /**
-     * Process one block of input from the array in and write it to
-     * the out array.
-     *
-     * @param in the array containing the input data.
-     * @param inOff offset into the in array the data starts at.
-     * @param out the array the output data will be copied into.
-     * @param outOff the offset into the out array the output will start at.
-     * @exception DataLengthException if there isn't enough data in in, or
-     * space in out.
-     * @exception IllegalStateException if the cipher isn't initialised.
-     * @return the number of bytes processed and produced.
-     */
-    public int processBlock(
-        byte[]      in,
-        int         inOff,
-        byte[]      out,
-        int         outOff)
-        throws DataLengthException, IllegalStateException
-    {
-        if ((inOff + blockSize) > in.length)
-        {
-            throw new DataLengthException("input buffer too short");
-        }
-
-        if ((outOff + blockSize) > out.length)
-        {
-            throw new DataLengthException("output buffer too short");
-        }
-
-        cipher.processBlock(ofbV, 0, ofbOutV, 0);
-
-        //
-        // XOR the ofbV with the plaintext producing the cipher text (and
-        // the next input block).
-        //
-        for (int i = 0; i < blockSize; i++)
-        {
-            out[outOff + i] = (byte)(ofbOutV[i] ^ in[inOff + i]);
-        }
-
-        //
-        // change over the input block.
-        //
-        System.arraycopy(ofbV, blockSize, ofbV, 0, ofbV.length - blockSize);
-        System.arraycopy(ofbOutV, 0, ofbV, ofbV.length - blockSize, blockSize);
-
-        return blockSize;
-    }
-
-    /**
-     * reset the feedback vector back to the IV and reset the underlying
-     * cipher.
-     */
-    public void reset()
-    {
-        System.arraycopy(IV, 0, ofbV, 0, IV.length);
-
-        cipher.reset();
-    }
-}