SSL_get_signature_nid

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) nothrow @nogc pragma(inline, true)
static if((libressl_d.openssl.opensslfeatures.LIBRESSL_HAS_TLS1_3) || (libressl_d.openssl.opensslfeatures.LIBRESSL_INTERNAL))
core.stdc.config.c_long
SSL_get_signature_nid

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