1 files changed, 0 insertions, 175 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/signers/DSTU4145Signer.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/signers/DSTU4145Signer.java
deleted file mode 100644
index 4aba32e4f..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/signers/DSTU4145Signer.java
+++ /dev/null
@@ -1,175 +0,0 @@
-package org.spongycastle.crypto.signers;
-
-import java.math.BigInteger;
-import java.security.SecureRandom;
-
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.DSA;
-import org.spongycastle.crypto.params.ECDomainParameters;
-import org.spongycastle.crypto.params.ECKeyParameters;
-import org.spongycastle.crypto.params.ECPrivateKeyParameters;
-import org.spongycastle.crypto.params.ECPublicKeyParameters;
-import org.spongycastle.crypto.params.ParametersWithRandom;
-import org.spongycastle.math.ec.ECAlgorithms;
-import org.spongycastle.math.ec.ECCurve;
-import org.spongycastle.math.ec.ECFieldElement;
-import org.spongycastle.math.ec.ECPoint;
-import org.spongycastle.util.Arrays;
-
-/**
- * DSTU 4145-2002
- * <p>
- * National Ukrainian standard of digital signature based on elliptic curves (DSTU 4145-2002).
- * </p>
- */
-public class DSTU4145Signer
-    implements DSA
-{
-    private static final BigInteger ONE = BigInteger.valueOf(1);
-
-    private ECKeyParameters key;
-    private SecureRandom random;
-
-    public void init(boolean forSigning, CipherParameters param)
-    {
-        if (forSigning)
-        {
-            if (param instanceof ParametersWithRandom)
-            {
-                ParametersWithRandom rParam = (ParametersWithRandom)param;
-
-                this.random = rParam.getRandom();
-                param = rParam.getParameters();
-            }
-            else
-            {
-                this.random = new SecureRandom();
-            }
-
-            this.key = (ECPrivateKeyParameters)param;
-        }
-        else
-        {
-            this.key = (ECPublicKeyParameters)param;
-        }
-
-    }
-
-    public BigInteger[] generateSignature(byte[] message)
-    {
-        ECDomainParameters parameters = key.getParameters();
-
-        ECCurve curve = parameters.getCurve();
-
-        ECFieldElement h = hash2FieldElement(curve, message);
-        if (h.isZero())
-        {
-            h = curve.fromBigInteger(ONE);
-        }
-
-        BigInteger n = parameters.getN();
-        BigInteger e, r, s;
-        ECFieldElement Fe, y;
-
-        do
-        {
-            do
-            {
-                do
-                {
-                    e = generateRandomInteger(n, random);
-                    Fe = parameters.getG().multiply(e).normalize().getAffineXCoord();
-                }
-                while (Fe.isZero());
-
-                y = h.multiply(Fe);
-                r = fieldElement2Integer(n, y);
-            }
-            while (r.signum() == 0);
-
-            s = r.multiply(((ECPrivateKeyParameters)key).getD()).add(e).mod(n);
-        }
-        while (s.signum() == 0);
-
-        return new BigInteger[]{r, s};
-    }
-
-    public boolean verifySignature(byte[] message, BigInteger r, BigInteger s)
-    {
-        if (r.signum() <= 0 || s.signum() <= 0)
-        {
-            return false;
-        }
-
-        ECDomainParameters parameters = key.getParameters();
-
-        BigInteger n = parameters.getN();
-        if (r.compareTo(n) >= 0 || s.compareTo(n) >= 0)
-        {
-            return false;
-        }
-
-        ECCurve curve = parameters.getCurve();
-
-        ECFieldElement h = hash2FieldElement(curve, message);
-        if (h.isZero())
-        {
-            h = curve.fromBigInteger(ONE);
-        }
-
-        ECPoint R = ECAlgorithms.sumOfTwoMultiplies(parameters.getG(), s, ((ECPublicKeyParameters)key).getQ(), r).normalize();
-
-        // components must be bogus.
-        if (R.isInfinity())
-        {
-            return false;
-        }
-
-        ECFieldElement y = h.multiply(R.getAffineXCoord());
-        return fieldElement2Integer(n, y).compareTo(r) == 0;
-    }
-
-    /**
-     * Generates random integer such, than its bit length is less than that of n
-     */
-    private static BigInteger generateRandomInteger(BigInteger n, SecureRandom random)
-    {
-        return new BigInteger(n.bitLength() - 1, random);
-    }
-    
-    private static void reverseBytes(byte[] bytes)
-    {
-        byte tmp;
-        
-        for (int i=0; i<bytes.length/2; i++)
-        {
-            tmp=bytes[i];
-            bytes[i]=bytes[bytes.length-1-i];
-            bytes[bytes.length-1-i]=tmp;
-        }
-    }
-
-    private static ECFieldElement hash2FieldElement(ECCurve curve, byte[] hash)
-    {
-        byte[] data = Arrays.clone(hash);
-        reverseBytes(data);
-        BigInteger num = new BigInteger(1, data);
-        while (num.bitLength() > curve.getFieldSize())
-        {
-            num = num.clearBit(num.bitLength() - 1);
-        }
-
-        return curve.fromBigInteger(num);
-    }
-
-    private static BigInteger fieldElement2Integer(BigInteger n, ECFieldElement fieldElement)
-    {
-        BigInteger num = fieldElement.toBigInteger();
-        while (num.bitLength() >= n.bitLength())
-        {
-            num = num.clearBit(num.bitLength() - 1);
-        }
-
-        return num;
-    }
-}