des加密

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package com.wtfypm; import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; public class DesEncrypt { Key key; /**   * 根据参数生成KEY   *   * @param strKey   */ public void getKey(String strKey) {   try {    KeyGenerator _generator = KeyGenerator.getInstance("DES");    _generator.init(new SecureRandom(strKey.getBytes()));    this.key = _generator.generateKey();    _generator = null;   } catch (Exception e) {    e.printStackTrace();   } } /**   * 加密String明文输入,String密文输出   *   * @param strMing   * @return   */ public String getEncString(String strMing) {   byte[] byteMi = null;   byte[] byteMing = null;   String strMi = "";   try {    return byte2hex(getEncCode(strMing.getBytes()));    // byteMing = strMing.getBytes("UTF8");    // byteMi = this.getEncCode(byteMing);    // strMi = new String( byteMi,"UTF8");   } catch (Exception e) {    e.printStackTrace();   } finally {    byteMing = null;    byteMi = null;   }   return strMi; } /**   * 解密 以String密文输入,String明文输出   *   * @param strMi   * @return   */ public String getDesString(String strMi) {   byte[] byteMing = null;   byte[] byteMi = null;   String strMing = "";   try {    return new String(getDesCode(hex2byte(strMi.getBytes())));    // byteMing = this.getDesCode(byteMi);    // strMing = new String(byteMing,"UTF8");   } catch (Exception e) {    e.printStackTrace();   } finally {    byteMing = null;    byteMi = null;   }   return strMing; } /**   * 加密以byte[]明文输入,byte[]密文输出   *   * @param byteS   * @return   */ private byte[] getEncCode(byte[] byteS) {   byte[] byteFina = null;   Cipher cipher;   try {    cipher = Cipher.getInstance("DES");    cipher.init(Cipher.ENCRYPT_MODE, key);    byteFina = cipher.doFinal(byteS);   } catch (Exception e) {    e.printStackTrace();   } finally {    cipher = null;   }   return byteFina; } /**   * 解密以byte[]密文输入,以byte[]明文输出   *   * @param byteD   * @return   */ private byte[] getDesCode(byte[] byteD) {   Cipher cipher;   byte[] byteFina = null;   try {    cipher = Cipher.getInstance("DES");    cipher.init(Cipher.DECRYPT_MODE, key);    byteFina = cipher.doFinal(byteD);   } catch (Exception e) {    e.printStackTrace();   } finally {    cipher = null;   }   return byteFina; } /**   * 二行制转字符串   *   * @param b   * @return   */ public static String byte2hex(byte[] b) { // 一个字节的数，   // 转成16进制字符串   String hs = "";   String stmp = "";   for (int n = 0; n < b.length; n++) {    // 整数转成十六进制表示    stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));    if (stmp.length() == 1)     hs = hs + "0" + stmp;    else     hs = hs + stmp;   }   return hs.toUpperCase(); // 转成大写 } public static byte[] hex2byte(byte[] b) {   if ((b.length % 2) != 0)    throw new IllegalArgumentException("长度不是偶数");   byte[] b2 = new byte ;   for (int n = 0; n < b.length; n += 2) {    String item = new String(b, n, 2);    // 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个进制字节    b2[n / 2] = (byte) Integer.parseInt(item, 16);   }   return b2; } public static void main(String[] args) {   System.out.println("hello");   DesEncrypt des = new DesEncrypt();// 实例化一个对像   des.getKey("00000000");// 生成密匙   String strEnc = des.getEncString("12345678");// 加密字符串,返回String的密文   System.out.println(strEnc);   String strDes = des.getDesString(strEnc);// 把String 类型的密文解密   System.out.println(strDes);    } } <!--v:3.2-->

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