[Ur] C FFI and openssl

[Todd Roth]

Thanks Benjamin.  Your library looks perfect for my hashing needs.  Hopefully will have some time later today to try it out.
Regards,
Todd


> On Jul 26, 2015, at 6:26 PM, Benjamin Barenblat <bbaren at mit.edu> wrote:
> 
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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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