1 files changed, 0 insertions, 77 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/RSABlindingFactorGenerator.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/RSABlindingFactorGenerator.java
deleted file mode 100644
index 50b7db5e3..000000000
--- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/RSABlindingFactorGenerator.java
+++ /dev/null
@@ -1,77 +0,0 @@
-package org.spongycastle.crypto.generators;
-
-import org.spongycastle.crypto.CipherParameters;
-import org.spongycastle.crypto.params.ParametersWithRandom;
-import org.spongycastle.crypto.params.RSAKeyParameters;
-import org.spongycastle.crypto.params.RSAPrivateCrtKeyParameters;
-
-import java.math.BigInteger;
-import java.security.SecureRandom;
-
-/**
- * Generate a random factor suitable for use with RSA blind signatures
- * as outlined in Chaum's blinding and unblinding as outlined in
- * "Handbook of Applied Cryptography", page 475.
- */
-public class RSABlindingFactorGenerator
-{
-    private static BigInteger ZERO = BigInteger.valueOf(0);
-    private static BigInteger ONE = BigInteger.valueOf(1);
-
-    private RSAKeyParameters key;
-    private SecureRandom random;
-
-    /**
-     * Initialise the factor generator
-     *
-     * @param param the necessary RSA key parameters.
-     */
-    public void init(
-        CipherParameters param)
-    {
-        if (param instanceof ParametersWithRandom)
-        {
-            ParametersWithRandom rParam = (ParametersWithRandom)param;
-
-            key = (RSAKeyParameters)rParam.getParameters();
-            random = rParam.getRandom();
-        }
-        else
-        {
-            key = (RSAKeyParameters)param;
-            random = new SecureRandom();
-        }
-
-        if (key instanceof RSAPrivateCrtKeyParameters)
-        {
-            throw new IllegalArgumentException("generator requires RSA public key");
-        }
-    }
-
-    /**
-     * Generate a suitable blind factor for the public key the generator was initialised with.
-     *
-     * @return a random blind factor
-     */
-    public BigInteger generateBlindingFactor()
-    {
-        if (key == null)
-        {
-            throw new IllegalStateException("generator not initialised");
-        }
-
-        BigInteger m = key.getModulus();
-        int length = m.bitLength() - 1; // must be less than m.bitLength()
-        BigInteger factor;
-        BigInteger gcd;
-
-        do
-        {
-            factor = new BigInteger(length, random);
-            gcd = factor.gcd(m);
-        }
-        while (factor.equals(ZERO) || factor.equals(ONE) || !gcd.equals(ONE));
-
-        return factor;
-    }
-}