1 files changed, 0 insertions, 71 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/ec/ECFixedTransform.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/ec/ECFixedTransform.java
deleted file mode 100644
index 7b35f1a10..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/ec/ECFixedTransform.java
+++ /dev/null
@@ -1,71 +0,0 @@
-package org.spongycastle.crypto.ec;
-
-import java.math.BigInteger;
-
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.params.ECPublicKeyParameters;
-import org.spongycastle.math.ec.ECPoint;
-
-/**
- * this transforms the original randomness used for an ElGamal encryption by a fixed value.
- */
-public class ECFixedTransform
-    implements ECPairFactorTransform
-{
-    private ECPublicKeyParameters key;
-
-    private BigInteger k;
-
-    public ECFixedTransform(BigInteger k)
-    {
-        this.k = k;
-    }
-
-    /**
-     * initialise the underlying EC ElGamal engine.
-     *
-     * @param param the necessary EC key parameters.
-     */
-    public void init(
-        CipherParameters    param)
-    {
-        if (!(param instanceof ECPublicKeyParameters))
-        {
-            throw new IllegalArgumentException("ECPublicKeyParameters are required for fixed transform.");
-        }
-
-        this.key = (ECPublicKeyParameters)param;
-    }
-
-    /**
-     * Transform an existing cipher test pair using the ElGamal algorithm. Note: it is assumed this
-     * transform has been initialised with the same public key that was used to create the original
-     * cipher text.
-     *
-     * @param cipherText the EC point to process.
-     * @return returns a new ECPair representing the result of the process.
-     */
-    public ECPair transform(ECPair cipherText)
-    {
-        if (key == null)
-        {
-            throw new IllegalStateException("ECFixedTransform not initialised");
-        }
-
-        ECPoint  g = key.getParameters().getG();
-        ECPoint  gamma = g.multiply(k);
-        ECPoint  phi = key.getQ().multiply(k).add(cipherText.getY());
-
-        return new ECPair(cipherText.getX().add(gamma).normalize(), phi.normalize());
-    }
-
-    /**
-     * Return the last transform value used by the transform
-     *
-     * @return a BigInteger representing k value.
-     */
-    public BigInteger getTransformValue()
-    {
-        return k;
-    }
-}