Cannot find the right encoding parameters (string to base64)

Question

The following string amFuZUBkb2UuY29tOkpATjNEb2UxCg== decodes to [email protected]:J@N3Doe1 (via online decoder).

But when I try to encode the string back ( tobase64) I get a different result. I've tried UT8, ASCII, Unicode. All give different results. I'm using C#.

   string str= u + ":" + v;
   byte[] rt = System.Text.ASCIIEncoding.ASCII.GetBytes(str.Trim());
   string t= Convert.ToBase64String(rt);

Thanks!

Try this : string input = "amFuZUBkb2UuY29tOkpATjNEb2UxCg=="; string output = Encoding.UTF8.GetString(Convert.FromBase64String(input)); Should be From not To. — jdweng
– jdweng, Commented Jun 10, 2017 at 18:14
No, you're not understanding well. I'm trying to find the right way in order to encode [email protected]:J@N3Doe1 to amFuZUBkb2UuY29tOkpATjNEb2UxCg== @jdweng Thanks! — Amen Jlili
– Amen Jlili, Commented Jun 10, 2017 at 18:20

score 1 · Accepted Answer · 2017-06-10 18:21:59Z

1

Starting from your base64 string, this gives us the correct answer of "[email protected]:J@N3Doe1\n" (the online encoder didn't clean up your end-of-line):

var test = "amFuZUBkb2UuY29tOkpATjNEb2UxCg==";
var output = Convert.FromBase64String(test);
foreach (var b in output){
    Console.Write((char)b);
}
Console.WriteLine();

Going back, this gives the string "amFuZUBkb2UuY29tOkpATjNEb2UxCg==":

var input = "[email protected]:J@N3Doe1\n";
var bytes = input.Select(c => (byte)c).ToArray();

var output = Convert.ToBase64String(bytes);
Console.WriteLine(output);

If you remove the end-of-line, you get the same string without the "Cg==" at the end.

edited Jun 10, 2017 at 18:21

answered Jun 10, 2017 at 18:20

user2509848

Sign up to request clarification or add additional context in comments.

2 Comments

Amen Jlili Over a year ago

That new line char.

user2509848 Over a year ago

I caught that one by noticing the output from the decoding contained a newline, so I checked the output in the debugger :)

Collectives™ on Stack Overflow

Cannot find the right encoding parameters (string to base64)

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related