x9fieldelement.java

来自「进行与数字证书相关开发必须的java源码」· Java 代码 · 共 49 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   X9FieldElement.java

package jit.asn1.x9;

import jit.asn1.*;
import jit.math.BigInteger;
import jit.math.ec.ECFieldElement;

public class X9FieldElement
    implements DEREncodable
{

    private ECFieldElement f;

    public X9FieldElement(ECFieldElement f)
    {
        this.f = f;
    }

    public X9FieldElement(boolean fP, BigInteger q, ASN1OctetString s)
    {
        if(fP)
            f = new jit.math.ec.ECFieldElement.Fp(q, new BigInteger(1, s.getOctets()));
        else
            throw new RuntimeException("not implemented");
    }

    public ECFieldElement getValue()
    {
        return f;
    }

    public DERObject getDERObject()
    {
        BigInteger tb = f.toBigInteger();
        int l = 0;
        if(tb.bitLength() == (tb.bitLength() / 8) * 8)
            l = 1;
        byte tmp[] = tb.toByteArray();
        byte data[] = new byte[tmp.length - l];
        System.arraycopy(tmp, l, data, 0, data.length);
        tb = null;
        return new DEROctetString(data);
    }
}