reorganized file layout (part 1: moves and renames)

[org.ibex.core.git] / src / org / bouncycastle / crypto / engines / RSAEngine.java

diff --git a/src/org/bouncycastle/crypto/engines/RSAEngine.java b/src/org/bouncycastle/crypto/engines/RSAEngine.java
deleted file mode 100644 (file)
index 0aaee2d..0000000
--- a/src/org/bouncycastle/crypto/engines/RSAEngine.java
+++ /dev/null
@@ -1,189 +0,0 @@
-package org.bouncycastle.crypto.engines;
-
-import java.math.BigInteger;
-
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.AsymmetricBlockCipher;
-import org.bouncycastle.crypto.params.RSAKeyParameters;
-import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
-
-/**
- * this does your basic RSA algorithm.
- */
-public class RSAEngine
-    implements AsymmetricBlockCipher
-{
-    private RSAKeyParameters        key;
-    private boolean                 forEncryption;
-
-    /**
-     * initialise the RSA engine.
-     *
-     * @param forEncryption true if we are encrypting, false otherwise.
-     * @param param the necessary RSA key parameters.
-     */
-    public void init(
-        boolean             forEncryption,
-        CipherParameters    param)
-    {
-        this.key = (RSAKeyParameters)param;
-        this.forEncryption = forEncryption;
-    }
-
-    /**
-     * Return the maximum size for an input block to this engine.
-     * For RSA this is always one byte less than the key size on
-     * encryption, and the same length as the key size on decryption.
-     *
-     * @return maximum size for an input block.
-     */
-    public int getInputBlockSize()
-    {
-        int     bitSize = key.getModulus().bitLength();
-
-        if (forEncryption)
-        {
-            return (bitSize + 7) / 8 - 1;
-        }
-        else
-        {
-            return (bitSize + 7) / 8;
-        }
-    }
-
-    /**
-     * Return the maximum size for an output block to this engine.
-     * For RSA this is always one byte less than the key size on
-     * decryption, and the same length as the key size on encryption.
-     *
-     * @return maximum size for an output block.
-     */
-    public int getOutputBlockSize()
-    {
-        int     bitSize = key.getModulus().bitLength();
-
-        if (forEncryption)
-        {
-            return (bitSize + 7) / 8;
-        }
-        else
-        {
-            return (bitSize + 7) / 8 - 1;
-        }
-    }
-
-    /**
-     * Process a single block using the basic RSA algorithm.
-     *
-     * @param in the input array.
-     * @param inOff the offset into the input buffer where the data starts.
-     * @param inLen the length of the data to be processed.
-     * @return the result of the RSA process.
-     * @exception DataLengthException the input block is too large.
-     */
-    public byte[] processBlock(
-        byte[]  in,
-        int     inOff,
-        int     inLen)
-    {
-        if (inLen > (getInputBlockSize() + 1))
-        {
-            throw new DataLengthException("input too large for RSA cipher.\n");
-        }
-        else if (inLen == (getInputBlockSize() + 1) && (in[inOff] & 0x80) != 0)
-        {
-            throw new DataLengthException("input too large for RSA cipher.\n");
-        }
-
-        byte[]  block;
-
-        if (inOff != 0 || inLen != in.length)
-        {
-            block = new byte[inLen];
-
-            System.arraycopy(in, inOff, block, 0, inLen);
-        }
-        else
-        {
-            block = in;
-        }
-
-        BigInteger  input = new BigInteger(1, block);
-        byte[]      output;
-
-        if (key instanceof RSAPrivateCrtKeyParameters)
-        {
-            //
-            // we have the extra factors, use the Chinese Remainder Theorem - the author
-            // wishes to express his thanks to Dirk Bonekaemper at rtsffm.com for 
-            // advice regarding the expression of this.
-            //
-            RSAPrivateCrtKeyParameters crtKey = (RSAPrivateCrtKeyParameters)key;
-
-            BigInteger d = crtKey.getExponent();
-            BigInteger p = crtKey.getP();
-            BigInteger q = crtKey.getQ();
-            BigInteger dP = crtKey.getDP();
-            BigInteger dQ = crtKey.getDQ();
-            BigInteger qInv = crtKey.getQInv();
-    
-            BigInteger mP, mQ, h, m;
-    
-            // mP = ((input mod p) ^ dP)) mod p
-            mP = (input.remainder(p)).modPow(dP, p);
-    
-            // mQ = ((input mod q) ^ dQ)) mod q
-            mQ = (input.remainder(q)).modPow(dQ, q);
-    
-            // h = qInv * (mP - mQ) mod p
-            h = mP.subtract(mQ);
-            h = h.multiply(qInv);
-            h = h.mod(p);               // mod (in Java) returns the positive residual
-    
-            // m = h * q + mQ
-            m = h.multiply(q);
-            m = m.add(mQ);
-    
-            output = m.toByteArray();
-        }
-        else
-        {
-            output = input.modPow(
-                        key.getExponent(), key.getModulus()).toByteArray();
-        }
-
-        if (forEncryption)
-        {
-            if (output[0] == 0 && output.length > getOutputBlockSize())        // have ended up with an extra zero byte, copy down.
-            {
-                byte[]  tmp = new byte[output.length - 1];
-
-                System.arraycopy(output, 1, tmp, 0, tmp.length);
-
-                return tmp;
-            }
-
-            if (output.length < getOutputBlockSize())     // have ended up with less bytes than normal, lengthen
-            {
-                byte[]  tmp = new byte[getOutputBlockSize()];
-
-                System.arraycopy(output, 0, tmp, tmp.length - output.length, output.length);
-
-                return tmp;
-            }
-        }
-        else
-        {
-            if (output[0] == 0)        // have ended up with an extra zero byte, copy down.
-            {
-                byte[]  tmp = new byte[output.length - 1];
-
-                System.arraycopy(output, 1, tmp, 0, tmp.length);
-
-                return tmp;
-            }
-        }
-        return output;
-    }
-}