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针对sm2和sm4两种加密算法的java实现

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package com.bouncycastle.asn1.cms;

import com.bouncycastle.asn1.ASN1Encodable;
import com.bouncycastle.asn1.ASN1EncodableVector;
import com.bouncycastle.asn1.ASN1Set;
import com.bouncycastle.asn1.BERSet;
import com.bouncycastle.asn1.DERObject;

public class Attributes
    extends ASN1Encodable
{
    private ASN1Set attributes;

    private Attributes(ASN1Set set)
    {
        attributes = set;
    }

    public Attributes(ASN1EncodableVector v)
    {
        attributes = new BERSet(v);
    }

    public static Attributes getInstance(Object obj)
    {
        if (obj instanceof Attributes)
        {
            return (Attributes)obj;
        }
        else if (obj != null)
        {
            return new Attributes(ASN1Set.getInstance(obj));
        }

        return null;
    }

    /**
     *      * Attributes ::=
     *   SET SIZE(1..MAX) OF Attribute -- according to RFC 5652
     * 
     * @return
     */
    public DERObject toASN1Object()
    {
        return attributes;
    }
}