Anderson Toshiyuki Sasaki 21655e396c cmake: Only use OpenSSL Ed25519 implementation when possible ...

It is possible for OpenSSL to have the type EVP_PKEY_ED25519 in
openssl/evp.h, but not the single shot functions EVP_DigestSign() and
EVP_DigestVerify() which are required to generate Ed25519 signatures.

Only switch to use OpenSSL Ed25519 implementation when OpenSSL have all
required types and functions.

Fixes: T197

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

2019-11-07 11:59:36 +01:00

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