java和object-c实现DES相同的加密算法！

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java和object-c实现DES相同的加密算法！10

下面是java写的des加密算法我想用object-c来实现相同的算法，最终两种语言获取的加密字符串是一样的，万分感激！！！

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

/**
 * DES加密的，文件中共有两个方法,加密、解密
 * @author jiayu.qiu@downjoy.com
 */
public class DES {

    /**
     * 已知密钥的情况下加密
     */
    public static String encode(String str, String key) throws Exception {
        byte[] rawKey=Base64.decode(key);
        IvParameterSpec sr=new IvParameterSpec(rawKey);
        DESKeySpec dks=new DESKeySpec(rawKey);
        SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("DES");
        SecretKey secretKey=keyFactory.generateSecret(dks);

        javax.crypto.Cipher cipher=Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, sr);

        byte data[]=str.getBytes("UTF8");
        byte encryptedData[]=cipher.doFinal(data);
        return Base64.encode(encryptedData).trim();
    }

    /**
     * 已知密钥的情况下解密
     */
    public static String decode(String str, String key) throws Exception {
        byte[] rawKey=Base64.decode(key);
        IvParameterSpec sr=new IvParameterSpec(rawKey);
        DESKeySpec dks=new DESKeySpec(rawKey);
        SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("DES");
        SecretKey secretKey=keyFactory.generateSecret(dks);
        Cipher cipher=Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, sr);
        byte encryptedData[]=Base64.decode(str);
        byte decryptedData[]=cipher.doFinal(encryptedData);
        return new String(decryptedData, "UTF8").trim();
    }

}