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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto.macs;

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.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
    }
}