Can RSA PSS-R be done simply with OpenSSL?

[Andrew Tucker]

There is example code for doing RSA PSS with OpenSSL at
https://www.idrix.fr/Root/Samples/openssl_pss_signature.c



On Tue, May 12, 2020 at 11:59 AM John McCabe <john at mccabe.org.uk> wrote:

> Hi,
> I've searched around, but found nothing that appears to help.
>
> I'm developing some software where I may be given a file that's been
> created (signed) by using the Crypto++ library's implementation of RSA
> PSS-R, with a SHA1 hash. As I understand it, the complete file contents
> then effectively becomes the signature, and the receiving end needs to
> recover the original file contents and verify its signature.
>
> Is the receiving end something I can do with OpenSSL? I have a need to use
> OpenSSL features in the software I'm developing so, if possible, I'd rather
> avoid having to include Crypto++ in it!
>
> Any pointers would be gratefully appreciated. For what it's worth, this is
> something I'm fairly new to so, if what I'm asking isn't clear, or if it
> sounds like I have some concepts wrong, please let me know.... gently ;-)
>
> Many thanks
> John
>
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