Question

I am trying to calculate a SHA-1 Hash from a string, but when I calculate the string using php’s sha1 function I get something different than when I try it in C#. I need C# to calculate the same string as PHP (since the string from php is calculated by a 3rd party that I cannot modify). How can I get C# to generate the same hash as PHP? Thanks!!!

String = [e-mail]

C# Code (Generates d32954053ee93985f5c3ca2583145668bb7ade86)

        string encode = secretkey + email;         UnicodeEncoding UE = new UnicodeEncoding();         byte[] HashValue, MessageBytes = UE.GetBytes(encode);         SHA1Managed SHhash = new SHA1Managed();         string strHex = '';          HashValue = SHhash.ComputeHash(MessageBytes);         foreach(byte b in HashValue) {             strHex += String.Format('{0:x2}', b);         } 

PHP Code (Generates a9410edeaf75222d7b576c1b23ca0a9af0dffa98)

sha1(); 

Answer 1

Use ASCIIEncoding instead of UnicodeEncoding. PHP uses ASCII charset for hash calculations.