RSA-PSSR with a server-side scripting language (php, perl, python, shell, …)?

I don't know of any scripting languages supporting Probabilistic Signature Scheme.

I don't know of any scripting languages supporting Probabilistic Signature Scheme. However, Perl does have PSS support: Crypt::RSA::SS::PSS. Use sample in "On Perl" chapter 11.5 Chilkat RSA Perl Library.

Chilkat, as far as I know, has libraries for many other languages as well. I am not sure if either of those support PSS-R (with message recovery).

Thanks for your suggestion, I will look at the Chilkat library, but I'm not sure if I will be able to use it with my web hosting service. – Greg Sep 8 at 8:32.

Phpseclib, a pure PHP RSA implementation, supports PSS. Just do $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PSS). Doesn't do PSS-R though...

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