org.bouncycastle.jcajce.provider.IvParametersCreator Maven / Gradle / Ivy

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The FIPS 140-3 Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms certified to FIPS 140-3 level 1. This jar contains JCE provider and low-level API for the BC-FJA version 2.0.0, FIPS Certificate #4743. Please see certificate for certified platform details.

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package org.bouncycastle.jcajce.provider;

import java.security.InvalidAlgorithmParameterException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.spec.IvParameterSpec;

import org.bouncycastle.crypto.Parameters;
import org.bouncycastle.crypto.ParametersWithIV;

class IvParametersCreator
    implements ParametersCreator
{
    private final ParametersWithIV baseParameters;

    IvParametersCreator(ParametersWithIV baseParameters)
    {
        this.baseParameters = baseParameters;
    }

    public Parameters createParameters(boolean forEncryption, AlgorithmParameterSpec spec, SecureRandom random)
        throws InvalidAlgorithmParameterException
    {
        if (spec instanceof IvParameterSpec)
        {
            return baseParameters.withIV(((IvParameterSpec)spec).getIV());
        }

        if (forEncryption && baseParameters.getAlgorithm().requiresAlgorithmParameters())
        {
            return baseParameters.withIV(random);
        }

        return baseParameters;
    }
}