How do I verify digital signature c#

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Hello. I have problem digital signature verification in c#. I want to receive string publicKey, string signature, string dataToCheck and check if signature decoded with public key really matches dataToCheck (i need this to verify if i expect person sent me data). I was experimenting, and looking C# System.Security.Cryptography but haven't found right functions (all of them require some big byte numbers as parameters, and I need to work with strings. I would really much appreciate help.

Posted 15-Aug-14 8:14am

Member 10964391

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Sergey Alexandrovich Kryukov 15-Aug-14 15:20pm

What is unclear? Everything is actually explained in the documentation on System.Security.Cryptography, but here is how it looks: you cannot find this information, but you are not giving us proper information, too. Say, which public-key algorithm do you want to use. If you did not decide on that, you could have mentioned that.

Now, do you understand public-key encryption in general? do you understand that encryption is done with one key and decryption with another one, and the implications of that? In other word, why public-key encryption based protection really protect, from what?

—SA

Member 10964391 15-Aug-14 15:33pm

Ups, i forgot to mention algorithm. We will probably know which algorithm is used for (d)encryption. For now, I don't care which one will be. I'm aware how process of digital signing works (from mathematical point). I just don't know how to code it.
I have tried with RSACryptoProvider and many more, but they all ask me to set key via some modulus and exponent, and i didn't found way to extract those data from string.

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