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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto.macs;

import org.spongycastle.crypto.BlockCipher;
import org.spongycastle.crypto.CipherParameters;

/**
 * A non-NIST variant which allows passing of an IV to the underlying CBC cipher.
 * Note: there isn't really a good reason to use an IV here, use the regular CMac where possible.
 */
public class CMacWithIV
    extends CMac
{
    public CMacWithIV(BlockCipher cipher)
    {
        super(cipher);
    }

    public CMacWithIV(BlockCipher cipher, int macSizeInBits)
    {
        super(cipher, macSizeInBits);
    }

    void validate(CipherParameters params)
    {
        // accept all
    }
}