1 files changed, 0 insertions, 154 deletions
diff --git a/core/src/main/java/org/bouncycastle/asn1/ua/DSTU4145PointEncoder.java b/core/src/main/java/org/bouncycastle/asn1/ua/DSTU4145PointEncoder.java
deleted file mode 100644
index 3405130e..00000000
--- a/core/src/main/java/org/bouncycastle/asn1/ua/DSTU4145PointEncoder.java
+++ /dev/null
@@ -1,154 +0,0 @@
-package org.bouncycastle.asn1.ua;
-
-import java.math.BigInteger;
-import java.util.Random;
-
-import org.bouncycastle.math.ec.ECConstants;
-import org.bouncycastle.math.ec.ECCurve;
-import org.bouncycastle.math.ec.ECFieldElement;
-import org.bouncycastle.math.ec.ECPoint;
-
-/**
- * DSTU4145 encodes points somewhat differently than X9.62
- * It compresses the point to the size of the field element
- */
-public abstract class DSTU4145PointEncoder
-{
-    private static ECFieldElement trace(ECFieldElement fe)
-    {
-        ECFieldElement t = fe;
-        for (int i = 1; i < fe.getFieldSize(); ++i)
-        {
-            t = t.square().add(fe);
-        }
-        return t;
-    }
-
-    /**
-     * Solves a quadratic equation <code>z<sup>2</sup> + z = beta</code>(X9.62
-     * D.1.6) The other solution is <code>z + 1</code>.
-     *
-     * @param beta The value to solve the quadratic equation for.
-     * @return the solution for <code>z<sup>2</sup> + z = beta</code> or
-     *         <code>null</code> if no solution exists.
-     */
-    private static ECFieldElement solveQuadraticEquation(ECCurve curve, ECFieldElement beta)
-    {
-        if (beta.isZero())
-        {
-            return beta;
-        }
-
-        ECFieldElement zeroElement = curve.fromBigInteger(ECConstants.ZERO);
-
-        ECFieldElement z = null;
-        ECFieldElement gamma = null;
-
-        Random rand = new Random();
-        int m = beta.getFieldSize();
-        do
-        {
-            ECFieldElement t = curve.fromBigInteger(new BigInteger(m, rand));
-            z = zeroElement;
-            ECFieldElement w = beta;
-            for (int i = 1; i <= m - 1; i++)
-            {
-                ECFieldElement w2 = w.square();
-                z = z.square().add(w2.multiply(t));
-                w = w2.add(beta);
-            }
-            if (!w.isZero())
-            {
-                return null;
-            }
-            gamma = z.square().add(z);
-        }
-        while (gamma.isZero());
-
-        return z;
-    }
-
-    public static byte[] encodePoint(ECPoint Q)
-    {
-        /*if (!Q.isCompressed())
-              Q=new ECPoint.F2m(Q.getCurve(),Q.getX(),Q.getY(),true);
-
-          byte[] bytes=Q.getEncoded();
-
-          if (bytes[0]==0x02)
-              bytes[bytes.length-1]&=0xFE;
-          else if (bytes[0]==0x02)
-              bytes[bytes.length-1]|=0x01;
-
-          return Arrays.copyOfRange(bytes, 1, bytes.length);*/
-
-        Q = Q.normalize();
-
-        ECFieldElement x = Q.getAffineXCoord();
-
-        byte[] bytes = x.getEncoded();
-
-        if (!x.isZero())
-        {
-            ECFieldElement z = Q.getAffineYCoord().divide(x);
-            if (trace(z).isOne())
-            {
-                bytes[bytes.length - 1] |= 0x01;
-            }
-            else
-            {
-                bytes[bytes.length - 1] &= 0xFE;
-            }
-        }
-
-        return bytes;
-    }
-
-    public static ECPoint decodePoint(ECCurve curve, byte[] bytes)
-    {
-        /*byte[] bp_enc=new byte[bytes.length+1];
-          if (0==(bytes[bytes.length-1]&0x1))
-              bp_enc[0]=0x02;
-          else
-              bp_enc[0]=0x03;
-          System.arraycopy(bytes, 0, bp_enc, 1, bytes.length);
-          if (!trace(curve.fromBigInteger(new BigInteger(1, bytes))).equals(curve.getA().toBigInteger()))
-              bp_enc[bp_enc.length-1]^=0x01;
-
-          return curve.decodePoint(bp_enc);*/
-
-        ECFieldElement k = curve.fromBigInteger(BigInteger.valueOf(bytes[bytes.length - 1] & 0x1));
-
-        ECFieldElement xp = curve.fromBigInteger(new BigInteger(1, bytes));
-        if (!trace(xp).equals(curve.getA()))
-        {
-            xp = xp.addOne();
-        }
-
-        ECFieldElement yp = null;
-        if (xp.isZero())
-        {
-            yp = curve.getB().sqrt();
-        }
-        else
-        {
-            ECFieldElement beta = xp.square().invert().multiply(curve.getB()).add(curve.getA()).add(xp);
-            ECFieldElement z = solveQuadraticEquation(curve, beta);
-            if (z != null)
-            {
-                if (!trace(z).equals(k))
-                {
-                    z = z.addOne();
-                }
-                yp = xp.multiply(z);
-            }
-        }
-
-        if (yp == null)
-        {
-            throw new IllegalArgumentException("Invalid point compression");
-        }
-
-        return curve.createPoint(xp.toBigInteger(), yp.toBigInteger());
-    }
-}