加密解密工具类：
public class MyTools {
/**
* 获取加密密钥Key
*
* @param keyString
* @return
*/
public static Key getKey(String keyString) {
byte[] keyStringByte = keyString.getBytes();
byte[] keyByte = new byte[8];
for (int i = 0; i < keyStringByte.length && i < keyByte.length; i++) {
keyByte[i] = keyStringByte[i];
}
Key key = new SecretKeySpec(keyByte, "DES");
return key;
}
/**
* 将byte数组转换成16进制String
*
* @param bytes
* @return
* @throws Exception
*/
public static String byteArr2HexStr(byte[] bytes) throws Exception {
StringBuffer sb = new StringBuffer(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
if ((bytes[i] & 0xFF) < 0x10)
sb.append("0");
sb.append(Integer.toHexString(bytes[i] & 0xFF));
}
return sb.toString();
}
/**
* 将16进制string转换成byte数组
*
* @param str
* @return
* @throws Exception
*/
public static byte[] hexStr2ByteArr(String str) throws Exception {
byte[] bytes = str.getBytes();
int len = bytes.length;
byte[] arr = new byte[len / 2];
for (int i = 0; i < len; i = i + 2) {
String tmp = new String(bytes, i, 2);
arr[i / 2] = (byte) Integer.parseInt(tmp, 16);
}
return arr;
}
/**
* 对字符串进行DES加密
*
* @param val
* 原始字符串
* @param key
* 加密使用的key
* @return
* @throws Exception
*/
public static String getDES(String val, String key) throws Exception {
if (val == null || key == null)
return null;
Cipher encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, getKey(key));
byte[] cipherByte = encryptCipher.doFinal(val.getBytes());
return byteArr2HexStr(cipherByte);
}
/**
* 对DES加密后的16进制字符串进行解密
*
* @param val
* @param key
* @return
* @throws Exception
*/
public static String getDESOri(String val, String key) throws Exception {
if (val == null || key == null)
return null;
Cipher decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, getKey(key));
byte[] originalByte = decryptCipher.doFinal(hexStr2ByteArr(val));
return new String(originalByte);
}
}
数据调用&设置：
//部分初始化
private EditText et_username;
et_username = (EditText) findViewById(R.id.et_username);
String userName = et_username.getText().toString().trim();
private String key = "JiaMi";//密钥
。。。
String getStr = MyTools.getDES(userName, key);//加密
。。。
String getoldStr = MyTools.getDESOri(getStr, key);//解密
