source: axis/net/deterlab/fedd/Fedid.java @ 56baf92

/**
 * Fedid
 *
 * Wrapper around a federated is
 */

package net.deterlab.isi;

import java.security.MessageDigest;
import java.security.PublicKey;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

public class Fedid {

    /** The bytes in the fedid */
    protected byte[] buf;


    /**
     * Empty constructor
     */
    public Fedid() { buf = null; }

    /**
     * Copy Constructor
     */
    public Fedid(Fedid f) { assign( f != null ? f.getBytes() : null); }
    /**
     * Create from a byte array
     */
    public Fedid(byte[] b) { assign(b); }

    /**
     * Create from X.509 certificate.
     */
    public Fedid(X509Certificate c) throws NoSuchAlgorithmException {
        assign(c);
    }

    public void assign(byte[] b) { 
        if ( b == null )
            buf = null;
        else{
            buf = new byte[b.length];
            System.arraycopy(b, 0, buf, 0, b.length);
        }
    }

    public void assign(X509Certificate c) throws NoSuchAlgorithmException {
        if ( c != null ) {
            MessageDigest md = MessageDigest.getInstance("SHA1");
            PublicKey pk = c.getPublicKey();
            
            if (pk.getFormat() == "X.509" && pk.getAlgorithm() == "RSA") {
                // This 22 is a hack, but I don't want to parse the ASN.1
                byte[] asn1 = pk.getEncoded();
                byte[] bits = new byte[asn1.length -22];

                System.arraycopy(asn1, 22, bits, 0, bits.length);

                buf = md.digest(bits);
            }
            else {
                throw new IllegalArgumentException("Unknown Key type");
            }
        }
        else buf = null;
    }

    /**
     * Printable version of the Fedid
     *
     * throws Null exception if the Fedid is uninitialized
     */
    public String toString() {
        String rv ="fedid:";

        for ( byte b : buf) {
            rv += String.format("%02x", b);
        }
        return rv;
    }

    public byte[] getBytes() { return buf; }

    public boolean equals(Fedid f) {
        byte[] b = f.getBytes();

        if (buf.length != b.length) return false;
        else {
            for ( int i =0; i < b.length; i++) 
                if ( buf[i] != b[i]) return false;
            return true;
        }
    }
}