/***
* MD5加碼 生成32位md5碼
*/
public static String md5(String inStr) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
logger.error("MD5加密失敗!");
return null;
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++){
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16){
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
/**
* 加密解密算法 執行一次加密，兩次解密
*/
public static String convertMD5(String inStr) {
char[] result = inStr.toCharArray();
for (int i = 0; i < result.length; i++) {
result[i] = (char) (result[i] ^ 't');
}
return new String(result);
}
public static void main(String args[]) {
String s = new String("wakaka" + getMd5Key());
System.out.println("原始：" + s);
System.out.println("MD5後：" + md5(s));
System.out.println("解密的：" + convertMD5(convertMD5(s)));
}
