Padding method in RSACryptoServiceProvider.SignData

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.NET3.5

Hi.

I have been researching about the padding method that uses RSACryptoServiceProvider.SignData in the .NET Framework. What I have found is that it uses PKCS by default but I can't find if it is PKCS#1.5, PKCS#2 or another version. ¿Does anyone know this? And most important, ¿can this feature be changed?

Thanks in advance

Ivan

Posted 18-May-11 7:54am

blackhattrick

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-18T08:33:00

Look at the second parameter of Encrypt. It looks like you only have a choice between RSA_PADDING_PKCS1 and RSA_PADDING_PKCS1_OAEP.

See:
http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx[^],
http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx[^] (see sample code illustrating the issue),
see also this discussion: http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/15f9e2d8-99bb-4ed0-bc8b-4a608c6272b7/[^].

It's likely that the full research may require your own implementation of RSA :-(.

—SA