MD5加密总结

/// <summary>
/// 将指定字符串进行MD5加密
/// </summary>
private string GetMD5str(string oldStr)
{
     //将输入转换为ASCII 字符编码
     ASCIIEncoding enc = new ASCIIEncoding();
     //将字符串转换为字节数组
     byte[] buffer = enc.GetBytes(oldStr);
     //创建MD5实例
     MD5 md5 = new MD5CryptoServiceProvider();
     //进行MD5加密
     byte[] hash = md5.ComputeHash(buffer);
     StringBuilder sb = new StringBuilder();
     //拼装加密后的字符
     for (int i = 0; i < hash.Length; i++)
     {
         sb.AppendFormat("{0:x2}", hash[i]);
     }
     //输出加密后的字符串
     return sb.ToString();
}
此外，用此方法时需要添加
using System.Security.Cryptography;
命名空间

return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");

1        public String md5(String s)2        {3            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();4            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);5            bytes = md5.ComputeHash(bytes);6            md5.Clear();78            string ret = "";9            for(int i=0 ; i<bytes.Length ; i++)10            {11                ret += Convert.ToString(bytes[i],16).PadLeft(2,'0');12            }1314            return ret.PadLeft(32,'0');15        }这个函数实现传如string,返回md5的string