sshrsapublickeystring.java

来自「一个非常好的ssh客户端实现」· Java 代码 · 共 75 行

/******************************************************************************
 *
 * Copyright (c) 1999-2003 AppGate Network Security AB. All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code as
 * defined in and that are subject to the MindTerm Public Source License,
 * Version 2.0, (the 'License'). You may not use this file except in compliance
 * with the License.
 * 
 * You should have received a copy of the MindTerm Public Source License
 * along with this software; see the file LICENSE.  If not, write to
 * AppGate Network Security AB, Otterhallegatan 2, SE-41118 Goteborg, SWEDEN
 *
 *****************************************************************************/

package com.mindbright.ssh;

import java.math.BigInteger;
import java.util.StringTokenizer;
import java.util.NoSuchElementException;
import java.io.*;

import com.mindbright.security.publickey.RSAPublicKey;

public class SSHRSAPublicKeyString extends RSAPublicKey {

  String user;
  String opts;

  public SSHRSAPublicKeyString(String opts, String user, BigInteger e, BigInteger n) {
    super(n, e);
    this.opts = opts;
    this.user = user;
  }

  public static SSHRSAPublicKeyString createKey(String opts, String pubKey) throws NoSuchElementException {
    StringTokenizer tok  = new StringTokenizer(pubKey);
    String          user = null;
    String bits;
    String e;
    String n;

    bits = tok.nextToken();
    e    = tok.nextToken();
    n    = tok.nextToken();
    if(tok.hasMoreElements())
      user = tok.nextToken();

    return new SSHRSAPublicKeyString(opts, user, new BigInteger(e), new BigInteger(n));
  }

  public String getOpts() {
    return opts;
  }

  public String getUser() {
    return user;
  }

  public String toString() {
      int bitLen = getModulus().bitLength();
      return ((opts != null ? (opts + " ") : "") +
	      bitLen + " " + getPublicExponent() + " " + getModulus() + " " +
	      (user != null ? user : ""));
  }

  public void toFile(String fileName) throws IOException {
    FileOutputStream    fileOut = new FileOutputStream(fileName);
    SSHDataOutputStream dataOut = new SSHDataOutputStream(fileOut);
    dataOut.writeBytes(toString());
    dataOut.close();
  }

}