Saltstack: Changing RSA public exponent from 1 to 65537

Re:Saltstack: Changing RSA public exponent from 1 to 65537 by jbert on Friday July 05, 2013 @10:48AM (#5995057)

> If I need to exchange encrypted messages in some store and forward style I'd likely use PGP.

Do you or others have any recommendations for cross-platform library code (at least OSX, Windows, Android, Linux, Windows 8) for this purpose?

I may have understood incorrectly, but I thought that using gpg from code required launching a sub-process (e.g. via gpgme). That makes me very nervous from a library point of view, perhaps I'm wrong to be nervous.

Is the answer still "use PGP/GPG" or is there somewhere else I could look to avoid home-made cryptosystem here?

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Re:Saltstack: Changing RSA public exponent from 1 to 65537 by jgrahamc on Friday July 05, 2013 @10:53AM (#5995086)

GPG actually has a library with all the crytographic primitives in it called libcrypt: https://en.wikipedia.org/wiki/Libgcrypt

If you want the PGP-level stuff then there's GPGME: http://www.gnupg.org/related_software/gpgme/index.en.html

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Re:Saltstack: Changing RSA public exponent from 1 to 65537 by jbert on Friday July 05, 2013 @11:17AM (#5995228)

Thanks for that. But afaics, libgcrypt seems to be on a similar level of abstraction as the openssl lib? i.e. implementations of ciphers etc. I then fall into the mistake of http://www.cs.berkeley.edu/~daw/teaching/cs261-f12/misc/if.h... I think? [linking to berkely.edu because the page seems to have gone from matasano.com?]

And I think GPGME is a lib which "under the hood" spawns a command-line gpg process? http://www.gnupg.org/faq/GnuPG-FAQ.html#cant-we-have-a-gpg-l...

At the moment it looks like my choice is between implementing a cryptosystem on top of crypto primitives (from openssl or libcrypt) or seeing if I can get away with shipping a lib which spawns child processes via gpgme.

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