一段 Java des 加密代码，求 PHP 实现

[cnbattle]

代码如下

import java.security.Key;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

/**
 * @Description
 */

public class DesUtils12306 {

  private final byte[]           DESkey = "L82V6ZVD6J".getBytes(); // 设置密钥，略去

  // 设置向量，略去

  private AlgorithmParameterSpec iv     = null;                   // 加密算法的参数接口，IvParameterSpec 是它的一个实现
  private Key                    key    = null;

  public DesUtils12306() throws Exception {
    MessageDigest md = MessageDigest.getInstance("SHA-1");
    byte[] digest = md.digest(DESkey);
    byte[] keyBytes = new byte[8];
    byte[] ivBytes = new byte[8];
    for (int i = 0; i < 8; i++) {
      keyBytes[i] = digest[i];
    }
    for (int i = 8; i < 16; i++) {
      ivBytes[i - 8] = digest[i];
    }
    DESKeySpec keySpec = new DESKeySpec(keyBytes);// 设置密钥参数
    iv = new IvParameterSpec(ivBytes);// 设置向量
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
    key = keyFactory.generateSecret(keySpec);// 得到密钥对象
  }

  public String encode(String data) throws Exception {
    Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象 Cipher
    enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
    byte[] pasByte = enCipher.doFinal(data.getBytes());
    return toHexString(pasByte).toUpperCase();
  }


  public static String toHexString(byte b[]) {
    StringBuffer hexString = new StringBuffer();
    for (int i = 0; i < b.length; i++) {
      String plainText = Integer.toHexString(0xff & b[i]);
      if (plainText.length() < 2)
        plainText = "0" + plainText;
      hexString.append(plainText);
    }

    return hexString.toString();
  }

  public static void main(String[] args) throws Exception {
    DesUtils12306 util = new DesUtils12306();
    String encode = util.encode("123");
    System.out.println(encode);
  }
}