C # get SHA256 code

1. If you want to get the SHA256 of a string , the code is as follows:

        public static string SHA256 (String str)        {            //If STR has Chinese, different encoding sha is different!!            byte[] sha256data = Encoding.UTF8.GetBytes (str);                       SHA256Managed Sha256 = new sha256managed ();            byte[] by = Sha256.computehash (sha256data);                        Return Bitconverter.tostring (by). Replace ("-", ""). ToLower ();            //return convert.tobase64string (by);                         /+        }

2. If you want to get the SHA256 of a file , the code is as follows:

　　

        public string SHA256 ()        {                   string str = @ "C:\Users\ICCWDT_Driver\iccwdt.sys";            FileStream stream = new FileStream (str, filemode.open);            SHA256Managed Sha256 = new sha256managed ();            byte[] by = Sha256.computehash (stream);            Return Bitconverter.tostring (by). Replace ("-", ""). ToLower ();            //return convert.tobase64string (by);                         /+        }

3. By looking at the system's APIs, you can see that there are two parameters that can be passed in: Incoming byte[] type or stream type

　　

         Summary:         //     computes the hash value of the specified byte array. ////        parameter:         //   buffer:        //     input to calculate its hash code.        ////        Returns the result:         //     computed hash code. ////        Exception:/         /   System.ArgumentNullException:        //     buffer is null. ////   system.objectdisposedexception:        //     This object has been disposed. Public byte[] ComputeHash (byte[] buffer);        //Summary:         //     calculates the hash value of the specified System.IO.Stream object. ////        parameter:         //   InputStream:        //     input to calculate its hash code.        ////        Returns the result:         //     computed hash code. ////        Exception:         //   system.objectdisposedexception:        //     This object has been disposed. Public byte[] ComputeHash (Stream inputstream);

　　

C # get SHA256 code