Direct Ed25519 functionality

[Billy Brumley]

Hey Nik,

> OpenSSL 1.1.1 includes three functions for “direct” Ed25519 signing and verification:

..

> Am I missing something here? Are these intentionally undocumented? Is there a reason why we don’t
> make them publicly available?

All crypto operations, including Ed25519, should use the higher level EVP 
interface. It's an architecture design decision in OpenSSL.

https://www.openssl.org/docs/man1.1.1/man3/EVP_DigestSignInit.html

https://wiki.openssl.org/index.php/EVP_Signing_and_Verifying

Hope it helps,

BBB
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