Cross-project request... looking for input on a rewrite of Asterisk's res_crypto.c module

[William Roberts]

On Tue, Mar 29, 2022 at 3:40 PM Philip Prindeville
<philipp_subx at redfish-solutions.com> wrote:
>
> Hi,
>
> I'm trying to develop a newer replacement module for Asterisk's res_crypto that is (for now) 1.1.x compatible but can be easily updated to 3.0 (and maybe even easily add provider support for TPM escrowed secrets, etc).

Just an FYI to see if you're aware of the tpm2 provider:
https://github.com/tpm2-software/tpm2-openssl

>
> I'm collecting requirements before I get started.
>
> https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=49153311
>
> The modules in Asterisk that use res_crypto are:
>
> func/func_aes.c
> chan/chan_iax2.c
> pbx/pbx_dundi.c
> pbx/dundi-parser.c
>
> as well as any independent third-party modules (but I'm not aware of what they might be).
>
> The code is rife with assumptions, such as only AES128 and RSA1024 are to be used, that only AES-EBC chaining is used, and that it's safe to block-cipher with RSA.  Signing digests, RSA padding and AES ciphers are hard-coded.  As are buffer sizes. (So you see why a rewrite is needed...)
>
> This is the tip of the proverbial iceberg.
>
> Anyway, more eyes on the problem are always a good thing.

Godspeed

>
> Thanks,
>
> -Philip
>
>