x9publickeyinfo.java

进行与数字证书相关开发必须的java源码

// 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:   X9PublicKeyInfo.java

package jit.asn1.x9;

import jit.asn1.*;
import jit.asn1.x509.AlgorithmIdentifier;
import jit.crypto.params.ECDomainParameters;
import jit.crypto.params.ECPublicKeyParameters;
import jit.math.ec.ECCurve;
import jit.math.ec.ECPoint;

// Referenced classes of package jit.asn1.x9:
//            X9ECParameters

public class X9PublicKeyInfo
    implements DEREncodable
{

    AlgorithmIdentifier algorithmID;
    DERBitString publicKey;

    public X9PublicKeyInfo()
    {
        algorithmID = null;
        publicKey = null;
    }

    public X9PublicKeyInfo(AlgorithmIdentifier algorithmID, DERBitString pubKey)
    {
        this.algorithmID = algorithmID;
        publicKey = pubKey;
    }

    public X9PublicKeyInfo(ASN1Sequence seq)
    {
        algorithmID = new AlgorithmIdentifier((ASN1Sequence)seq.getObjectAt(0));
        DERObjectIdentifier tID = algorithmID.getObjectId();
        if(tID.equals("1.2.840.10045.2.1"))
        {
            throw new IllegalArgumentException("unknown object when creating object");
        } else
        {
            publicKey = (DERBitString)seq.getObjectAt(1);
            return;
        }
    }

    public ECDomainParameters getECDomainParameters()
    {
        ASN1Sequence tX9ECParamsSeq = (ASN1Sequence)algorithmID.getParameters();
        X9ECParameters tX9ECParams = new X9ECParameters(tX9ECParamsSeq);
        return new ECDomainParameters(tX9ECParams.getCurve(), tX9ECParams.getG(), tX9ECParams.getN(), tX9ECParams.getH(), tX9ECParams.getSeed());
    }

    public ECPublicKeyParameters getECPublicKeyParameters()
    {
        ECCurve tECCurve = getECDomainParameters().getCurve();
        ECPoint tECPoint = tECCurve.decodePoint(publicKey.getBytes());
        return new ECPublicKeyParameters(tECPoint, getECDomainParameters());
    }

    public static X9PublicKeyInfo getInstance(Object obj)
    {
        if(obj instanceof X9PublicKeyInfo)
            return (X9PublicKeyInfo)obj;
        if(obj instanceof ASN1Sequence)
            return new X9PublicKeyInfo((ASN1Sequence)obj);
        else
            throw new IllegalArgumentException("unknown object in factory");
    }

    public DERObject getDERObject()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();
        v.add(algorithmID);
        v.add(publicKey);
        return new DERSequence(v);
    }
}