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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.crypto.params;

import org.spongycastle.crypto.CipherParameters;

import java.math.BigInteger;

public class RSABlindingParameters
    implements CipherParameters
{
    private RSAKeyParameters publicKey;
    private BigInteger       blindingFactor;

    public RSABlindingParameters(
        RSAKeyParameters publicKey,
        BigInteger       blindingFactor)
    {
        if (publicKey instanceof RSAPrivateCrtKeyParameters)
        {
            throw new IllegalArgumentException("RSA parameters should be for a public key");
        }
        
        this.publicKey = publicKey;
        this.blindingFactor = blindingFactor;
    }

    public RSAKeyParameters getPublicKey()
    {
        return publicKey;
    }

    public BigInteger getBlindingFactor()
    {
        return blindingFactor;
    }
}