On Fri 2017-07-07 18:01:03 +0200, gnupg-u...@niob.at wrote: > I am looking for a "simple" way to use a GPG public/private RSA key to > do "raw" RSA operations. I have the impression, that gpgme only deals > with "real" OpenPGP data structures, but this does not fit my use case. > This is for an application that is currently based on openssl crypto.
you're right -- gpgm is only for higher-level protocol operations,
whether they're OpenPGP or CMS (cryptographic message syntax). it
doesn't offer low-level crypto primitives.
if you want low-level crypto primitives that are GPL-compatible, you can
use libhogweed (from the nettle project) or libgcrypt.
Modern GnuPG uses libgcrypt for its crypto primitives, fwiw.
--dkg
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