Converting a publickey mod & publickey exponent to an RSA key in C#

Asked Sep 12 '15 at 15:07

Active Sep 12 '15 at 15:10

Viewed 26 times

I've got a very long string (512 chars) that is the mod for the RSA key. I have tried converting it to an int, however it throws an overflow exception all the time:

int mod = Int32.Parse(loginData["publickey_mod"], System.Globalization.NumberStyles.HexNumber);

I have also got an exponent in the form of a string (eg "010001"). I have been trying to generate an RSA but the overflow error is bugging me. How can I makse sure that I don't get an overflow error and additionally, how do I construct the RSA of this data in C#?

edited Sep 12 '15 at 15:10

Daniel A. White

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asked Sep 12 '15 at 15:07

Thomas Wagenaar

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you could use a `BigInteger`, but what are you planning to do with it? Most of the .net encryption libraries deal with byte arrays. – Daniel A. White Sep 12 '15 at 15:10
For some reason system.numerics is not recognised – Thomas Wagenaar Sep 12 '15 at 15:13
what version and flavor of the framework are you targetting? – Daniel A. White Sep 12 '15 at 15:13
I'm using .NET framework 4.5 – Thomas Wagenaar Sep 12 '15 at 17:14
Nevermind, I got it to work. Adding a reference was necessary for it to work. – Thomas Wagenaar Sep 12 '15 at 17:16

Converting a publickey mod & publickey exponent to an RSA key in C#

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