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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.its.asn1;

import org.bouncycastle.util.Arrays;

class Utils
{
    /**
     *      *     OCTET STRING (SIZE(n))
     * 
     */
    static byte[] octetStringFixed(byte[] octets, int n)
    {
        if (octets.length != n)
        {
            throw new IllegalArgumentException("octet string out of range");
        }

        return octets;
    }

    /**
     *      *     OCTET STRING (SIZE(1..32))
     * 
     */
    static byte[] octetStringFixed(byte[] octets)
    {
        if (octets.length < 1 || octets.length > 32)
        {
            throw new IllegalArgumentException("octet string out of range");
        }

        return Arrays.clone(octets);
    }
}