MD5加密算法实现

/**
* md5加密
* @param strSrc
* @param encName
* @return
*/
public static String Encrypt(String strSrc, String encName) {
MessageDigest md = null;
// 加密后的字符串
String strDes = null;
// 要加密的字符串字节型数组
byte[] bt = strSrc.getBytes();
try {
if (encName == null || encName.equals(""))
encName = "MD5";
md = MessageDigest.getInstance(encName);
md.update(bt);
// 通过执行诸如填充之类的最终操作完成哈希计算
strDes = bytes2Hex(md.digest()); // to HexString
} catch (NoSuchAlgorithmException e) {
System.out.println("Invalid algorithm.\n" + e.getMessage());
return null;
}
return strDes;
}


// 将字节数组转换成16进制的字符串
private static String bytes2Hex(byte[] bts) {
String des = "";
String tmp = null;


for (int i = 0; i < bts.length; i++) {
tmp = (Integer.toHexString(bts[i] & 0xFF));
if (tmp.length() == 1) {
des += "0";
}
des += tmp;
}
return des;
}