com.braintree.org.bouncycastle.asn1.DERInteger Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of encryption Show documentation

Client side encryption for Braintree integrations on Android.

There is a newer version: 2.1.0

package com.braintree.org.bouncycastle.asn1;

import java.io.IOException;
import java.math.BigInteger;

import com.braintree.org.bouncycastle.util.Arrays;

public class DERInteger
    extends ASN1Object
{
    byte[]      bytes;

    /**
     * return an integer from the passed in object
     *
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static DERInteger getInstance(
        Object  obj)
    {
        if (obj == null || obj instanceof DERInteger)
        {
            return (DERInteger)obj;
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    /**
     * return an Integer from a tagged object.
     *
     * @param obj the tagged object holding the object we want
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the tagged object cannot
     *               be converted.
     */
    public static DERInteger getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        DERObject o = obj.getObject();

        if (explicit || o instanceof DERInteger)
        {
            return getInstance(o);
        }
        else
        {
            return new ASN1Integer(ASN1OctetString.getInstance(obj.getObject()).getOctets());
        }
    }

    public DERInteger(
        int         value)
    {
        bytes = BigInteger.valueOf(value).toByteArray();
    }

    public DERInteger(
        BigInteger   value)
    {
        bytes = value.toByteArray();
    }

    public DERInteger(
        byte[]   bytes)
    {
        this.bytes = bytes;
    }

    public BigInteger getValue()
    {
        return new BigInteger(bytes);
    }

    /**
     * in some cases positive values get crammed into a space,
     * that's not quite big enough...
     */
    public BigInteger getPositiveValue()
    {
        return new BigInteger(1, bytes);
    }

    void encode(
        DEROutputStream out)
        throws IOException
    {
        out.writeEncoded(INTEGER, bytes);
    }
    
    public int hashCode()
    {
         int     value = 0;
 
         for (int i = 0; i != bytes.length; i++)
         {
             value ^= (bytes[i] & 0xff) << (i % 4);
         }
 
         return value;
    }

    boolean asn1Equals(
        DERObject  o)
    {
        if (!(o instanceof DERInteger))
        {
            return false;
        }

        DERInteger other = (DERInteger)o;

        return Arrays.areEqual(bytes, other.bytes);
    }

    public String toString()
    {
      return getValue().toString();
    }
}