threedesutil.java

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package cn.js.fan.security;



import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;


public class ThreeDesUtil {
     private static final String Algorithm = "DESede"; 

     public ThreeDesUtil() {
        
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
    }

    public static String encrypt2hex(String key, String content) {
        byte[] r = encryptMode(key.getBytes(), content.getBytes());
        return SecurityUtil.byte2hex(r);
    }

    public static String decrypthexstr(String key, String hexStr) {
        byte[] r = decryptMode(key.getBytes(), SecurityUtil.hexstr2byte(hexStr));
        if (r!=null)
            return new String(r);
        else
            return "";
    }

    
    
    public static byte[] encryptMode(byte[] keybyte, byte[] src) {
        try {
            
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    
    
    public static byte[] decryptMode(byte[] keybyte, byte[] src) {
        try {
            
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }


}