1 files changed, 0 insertions, 137 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/engines/RSABlindingEngine.java b/bcprov/src/main/java/org/bouncycastle/crypto/engines/RSABlindingEngine.java
deleted file mode 100644
index a8ecb9b..0000000
--- a/bcprov/src/main/java/org/bouncycastle/crypto/engines/RSABlindingEngine.java
+++ /dev/null
@@ -1,137 +0,0 @@
-package org.bouncycastle.crypto.engines;
-
-import org.bouncycastle.crypto.AsymmetricBlockCipher;
-import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.DataLengthException;
-import org.bouncycastle.crypto.params.ParametersWithRandom;
-import org.bouncycastle.crypto.params.RSABlindingParameters;
-import org.bouncycastle.crypto.params.RSAKeyParameters;
-
-import java.math.BigInteger;
-
-/**
- * This does your basic RSA Chaum's blinding and unblinding as outlined in
- * "Handbook of Applied Cryptography", page 475. You need to use this if you are
- * trying to get another party to generate signatures without them being aware
- * of the message they are signing.
- */
-public class RSABlindingEngine
-    implements AsymmetricBlockCipher
-{
-    private RSACoreEngine core = new RSACoreEngine();
-
-    private RSAKeyParameters key;
-    private BigInteger blindingFactor;
-
-    private boolean forEncryption;
-
-    /**
-     * Initialise the blinding engine.
-     *
-     * @param forEncryption true if we are encrypting (blinding), false otherwise.
-     * @param param         the necessary RSA key parameters.
-     */
-    public void init(
-        boolean forEncryption,
-        CipherParameters param)
-    {
-        RSABlindingParameters p;
-
-        if (param instanceof ParametersWithRandom)
-        {
-            ParametersWithRandom rParam = (ParametersWithRandom)param;
-
-            p = (RSABlindingParameters)rParam.getParameters();
-        }
-        else
-        {
-            p = (RSABlindingParameters)param;
-        }
-
-        core.init(forEncryption, p.getPublicKey());
-
-        this.forEncryption = forEncryption;
-        this.key = p.getPublicKey();
-        this.blindingFactor = p.getBlindingFactor();
-    }
-
-    /**
-     * 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()
-    {
-        return core.getInputBlockSize();
-    }
-
-    /**
-     * 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()
-    {
-        return core.getOutputBlockSize();
-    }
-
-    /**
-     * Process a single block using the RSA blinding 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.
-     * @throws DataLengthException the input block is too large.
-     */
-    public byte[] processBlock(
-        byte[] in,
-        int inOff,
-        int inLen)
-    {
-        BigInteger msg = core.convertInput(in, inOff, inLen);
-
-        if (forEncryption)
-        {
-            msg = blindMessage(msg);
-        }
-        else
-        {
-            msg = unblindMessage(msg);
-        }
-
-        return core.convertOutput(msg);
-    }
-
-    /*
-     * Blind message with the blind factor.
-     */
-    private BigInteger blindMessage(
-        BigInteger msg)
-    {
-        BigInteger blindMsg = blindingFactor;
-        blindMsg = msg.multiply(blindMsg.modPow(key.getExponent(), key.getModulus()));
-        blindMsg = blindMsg.mod(key.getModulus());
-
-        return blindMsg;
-    }
-
-    /*
-     * Unblind the message blinded with the blind factor.
-     */
-    private BigInteger unblindMessage(
-        BigInteger blindedMsg)
-    {
-        BigInteger m = key.getModulus();
-        BigInteger msg = blindedMsg;
-        BigInteger blindFactorInverse = blindingFactor.modInverse(m);
-        msg = msg.multiply(blindFactorInverse);
-        msg = msg.mod(m);
-
-        return msg;
-    }
-}