SHA1 encoding not working as expected in C#

Question

I have the following string: TheString = 12424$456$06$4539527688361959$2017$188.98.78.191$

I want the SHA1 Hash of that string and for that I'm using the following code:

string TheSHA1Hash = BitConverter.ToString(new SHA1Managed().ComputeHash(Encoding.UTF8.GetBytes(TheString)));

This is the output:

8F-BA-36-2C-FC-DE-31-B2-AC-66-07-37-2D-80-85-63-5A-33-35-F4

When I go to http://www.sha1-online.com/ and hash the string, this is the output, which is what I want:

8fba362cfcde31b2ac6607372d8085635a3335f4

It looks the same but it's not the same. How can I get the output I want?

it looks like in lazy way, removing dashes and putting it in lower case will make you work done :D <3 — jace, Dec 16 '16 at 02:04

score 5 · Accepted Answer · edited May 23 '17 at 10:30

Just remove the dashes (with Replace()) and make lowercase (with ToLower()).

string TheSHA1Hash = BitConverter.ToString(new SHA1Managed().ComputeHash(Encoding.UTF8.GetBytes(TheString))).Replace("-","").ToLower();

Here it is in a format that is a bit easier to read:

var hasher = new SHA1Managed();
var hash = hasher.ComputeHash(Encoding.UTF8.GetBytes(TheString));
var byteString = BitConverter.ToString(hash);
var theSHA1Hash = byteString.Replace("-","").ToLower();

SHA1 encoding not working as expected in C#

2 Answers2