derobjectidentifier.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:   DERObjectIdentifier.java

package jit.asn1;

import java.io.*;

// Referenced classes of package jit.asn1:
//            DERObject, ASN1OctetString, ASN1TaggedObject, OIDTokenizer, 
//            DEROutputStream

public class DERObjectIdentifier extends DERObject
{

    String identifier;

    public static DERObjectIdentifier getInstance(Object obj)
    {
        if(obj == null || (obj instanceof DERObjectIdentifier))
            return (DERObjectIdentifier)obj;
        if(obj instanceof ASN1OctetString)
            return new DERObjectIdentifier(((ASN1OctetString)obj).getOctets());
        if(obj instanceof ASN1TaggedObject)
            return getInstance(((ASN1TaggedObject)obj).getObject());
        else
            throw new IllegalArgumentException("illegal object in getInstance: ".concat(String.valueOf(String.valueOf(obj.getClass().getName()))));
    }

    public static DERObjectIdentifier getInstance(ASN1TaggedObject obj, boolean explicit)
    {
        return getInstance(obj.getObject());
    }

    DERObjectIdentifier(byte bytes[])
    {
        StringBuffer objId = new StringBuffer();
        int value = 0;
        boolean first = true;
        for(int i = 0; i != bytes.length; i++)
        {
            int b = bytes[i] & 0xff;
            value = value * 128 + (b & 0x7f);
            if((b & 0x80) != 0)
                continue;
            if(first)
            {
                switch(value / 40)
                {
                case 0: // '\0'
                    objId.append('0');
                    break;

                case 1: // '\001'
                    objId.append('1');
                    value -= 40;
                    break;

                default:
                    objId.append('2');
                    value -= 80;
                    break;
                }
                first = false;
            }
            objId.append('.');
            objId.append(Integer.toString(value));
            value = 0;
        }

        identifier = objId.toString();
    }

    public DERObjectIdentifier(String identifier)
    {
        this.identifier = identifier;
    }

    public String getId()
    {
        return identifier;
    }

    private void writeField(OutputStream out, int fieldValue)
        throws IOException
    {
        if(fieldValue >= 128)
        {
            if(fieldValue >= 16384)
            {
                if(fieldValue >= 0x200000)
                {
                    if(fieldValue >= 0x10000000)
                        out.write(fieldValue >> 28 | 0x80);
                    out.write(fieldValue >> 21 | 0x80);
                }
                out.write(fieldValue >> 14 | 0x80);
            }
            out.write(fieldValue >> 7 | 0x80);
        }
        out.write(fieldValue & 0x7f);
    }

    void encode(DEROutputStream out)
        throws IOException
    {
        OIDTokenizer tok = new OIDTokenizer(identifier);
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        DEROutputStream dOut = new DEROutputStream(bOut);
        writeField(bOut, Integer.parseInt(tok.nextToken()) * 40 + Integer.parseInt(tok.nextToken()));
        for(; tok.hasMoreTokens(); writeField(bOut, Integer.parseInt(tok.nextToken())));
        dOut.close();
        byte bytes[] = bOut.toByteArray();
        out.writeEncoded(6, bytes);
    }

    public int hashCode()
    {
        return identifier.hashCode();
    }

    public boolean equals(Object o)
    {
        if(o == null || !(o instanceof DERObjectIdentifier))
            return false;
        else
            return identifier.equals(((DERObjectIdentifier)o).identifier);
    }
}