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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.cmp;

import com.bouncycastle.asn1.ASN1Encodable;
import com.bouncycastle.asn1.ASN1EncodableVector;
import com.bouncycastle.asn1.ASN1Sequence;
import com.bouncycastle.asn1.DERObject;
import com.bouncycastle.asn1.DERSequence;

public class GenRepContent
    extends ASN1Encodable
{
    private ASN1Sequence content;

    private GenRepContent(ASN1Sequence seq)
    {
        content = seq;
    }

    public static GenRepContent getInstance(Object o)
    {
        if (o instanceof GenRepContent)
        {
            return (GenRepContent)o;
        }

        if (o instanceof ASN1Sequence)
        {
            return new GenRepContent((ASN1Sequence)o);
        }

        throw new IllegalArgumentException("Invalid object: " + o.getClass().getName());
    }

    public GenRepContent(InfoTypeAndValue itv)
    {
        content = new DERSequence(itv);
    }

    public GenRepContent(InfoTypeAndValue[] itv)
    {
        ASN1EncodableVector v = new ASN1EncodableVector();
        for (int i = 0; i < itv.length; i++)
        {
            v.add(itv[i]);
        }
        content = new DERSequence(v);
    }

    public InfoTypeAndValue[] toInfoTypeAndValueArray()
    {
        InfoTypeAndValue[] result = new InfoTypeAndValue[content.size()];

        for (int i = 0; i != result.length; i++)
        {
            result[i] = InfoTypeAndValue.getInstance(content.getObjectAt(i));
        }

        return result;
    }

    /**
     *      * GenRepContent ::= SEQUENCE OF InfoTypeAndValue
     * 
     * @return a basic ASN.1 object representation.
     */
    public DERObject toASN1Object()
    {
        return content;
    }
}