Removing difference between CLI and FFI use for computing a message digest
sage at sagegerard.com
Tue Sep 15 21:48:32 UTC 2020
I have a Racket program that uses libcrypto through FFI bindings to compute digests. It's wrong because it returns different answers than `openssl dgst`, regardless of hash algorithm.
The code is here: https://github.com/zyrolasting/xiden/blob/libcrypto/openssl.rkt#L76
It is based on the example in: https://wiki.openssl.org/index.php/EVP_Message_Digests.
I'm not expecting anyone to run this program or review Racket code in detail. The links are just there for context. I just want to know if there are common C-level mistakes libcrypto users make that would make their digests disagree with the CLI. As far as I can tell, I replicated the example on wiki.openssl.org well enough to deterministically compute a digest with any byte string.
Let me know if there is any other context I can provide.
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