MD5加密过时方法替换

使用system.web.security.formsauthentication.hashpasswordforstoringinconfigfile进行md5加密时，会出现已过时

 1 /// <summary>
 2 /// 32位md5加密
 3 /// </summary>
 4 /// <param name="input"></param>
 5 /// <returns></returns>
 6 private static string md5hash(string input)
 7 {
 8     md5cryptoserviceprovider md5hasher = new md5cryptoserviceprovider();
 9     byte[] data = md5hasher.computehash(encoding.default.getbytes(input));
10     stringbuilder sbuilder = new stringbuilder();
11     for (int i = 0; i < data.length; i++)
12     {
13         sbuilder.append(data[i].tostring("x2"));
14     }
15     return sbuilder.tostring();
16 }