C# 输入输出均为string的HMAC-MD5

     public    bool  hmac_md5( string  timespan,   password,255);">ref    outdigest)
     ... {

        

byte[] b_tmp;

        

[] b_tmp1;

        

string szRet = .Empty;

        

if (password ==null|| password.Length <1)
        ...{

            

returnfalse;

        }

        

[] digest new[512];

        

[] k_ipad 64[] k_opad [] source  System.Text.ASCIIEncoding.ASCII.GetBytes(password);

        System.Security.Cryptography.MD5 shainner 

 MD5CryptoServiceProvider();

        

for (int i 0; i ; i++)
        ...{

            k_ipad[i] 

^0x36;

            k_opad[i] 

0x5ctry
        ... (source.Length >)
            ...{

                shainner 

 MD5CryptoServiceProvider();

                source 

 shainner.ComputeHash(source);

            }

            

 source.Length; i)
            ...{

                k_ipad[i] 

)(source[i] );

                k_opad[i] 

);

            }

            b_tmp1 

 System.Text.ASCIIEncoding.ASCII.GetBytes(timespan);

            b_tmp 

 adding(k_ipad, b_tmp1);

            shainner 

 MD5CryptoServiceProvider();

            digest 

 shainner.ComputeHash(b_tmp);

            b_tmp 

 adding(k_opad, digest);

            shainner 

 shainner.ComputeHash(b_tmp);

//             for (int i = 0; i < digest.Length; i++)

             {

                outdigest  System.Text.ASCIIEncoding.ASCII.GetString(digest);[i].ToString(); 

                 

             }            truecatch (Exception e)
        ...{

            outdigest 

 e.Message.ToString();

            

    }

     /**/ /***

    * * 填充byte

     **

*/

    

byte [] adding( [] a,0);">[] b)
     ... [] c [a.Length + b.Length];

        a.CopyTo(c, 

);

        b.CopyTo(c, a.Length);

        

 c;

    }