Re: [exim] DKIM - signing mail

exim-users@??? wrote:

> openssl creates 2 libraries: libssl and libcrypto. The first one
> implements the ssl/tls protocol, the latter one the various crypto
> algorithms. Since dkim just needs some crypto algorithms for creating
> and verifying signatures, I'd expect it to pull them out of libcrypto.
> libssl is not interesting in this context. So you should rather check
> your libcrypto for the EVP_sha256 symbol.
>

True, there is an sha256 there.

# strings /usr/lib/libcrypto.so.13.0 | grep sha256
sha256WithRSAEncryption
sha256

But not EVP_sha256.

If I have a more detailed look at evp.h
#ifndef OPENSSL_NO_SHA256
const EVP_MD *EVP_sha224(void);
const EVP_MD *EVP_sha256(void);
#endif

NO_SHA256 doesn't seem to be defined anywhere

Also, SHA256 is in libc...

So I think this is an OpenBSD specific problem.