[Ur] C FFI and openssl

[Benjamin Barenblat]

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Hi Todd,

I’m a bit rusty on linker syntax, but I _think_ that instead of

    gcc […] -lcrypto -lssl […]crypt.o

you want

    gcc […]crypt.o […] -lcrypto -lssl

The linker needs to see that crypt.o uses 'SHA256@@OPENSSL_1.0.0' so it
can pull the appropriate symbol out of libcrypto.so, and it makes only
one pass from left to right.

As an aside, I’ve written an FFI library [1] which looks like it does
exactly what you want.  Naturally, you’re welcome to use it.

Best,
Benjamin

[1] https://benjamin.barenblat.name/gitweb/?p=urweb-crypto-hash-openssl.git
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