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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.crypto.constraints;

import java.util.Set;

class Utils
{
    /**
     * Depending on usage, in some places algorithms are referred to slightly
     * differently. We try to sort that out here.
     *
     * @param exceptions set of exceptions from constraint checking.
     */
    static void addAliases(Set exceptions)
    {
        if (exceptions.contains("RC4"))
        {
            exceptions.add("ARC4");
        }
        else if (exceptions.contains("ARC4"))
        {
            exceptions.add("RC4");
        }
    }
}