support --without-openssl at configure time

Disables and removes dependency on OpenSSL. Many features don't
work and the set of crypto options is greatly restricted. This
will only work on system with native arc4random or /dev/urandom.

Considered highly experimental for now.

1 files changed, 2 insertions, 2 deletions

diff --git a/kex.c b/kex.c
index fff44335..ce0bf880 100644
--- a/kex.c
+++ b/kex.c
@@ -90,9 +90,9 @@ static const struct kexalg kexalgs[] = {
 # endif /* OPENSSL_HAS_NISTP521 */
 #endif /* OPENSSL_HAS_ECC */
 #endif /* WITH_OPENSSL */
-#ifdef HAVE_EVP_SHA256
+#if defined(HAVE_EVP_SHA256) || !defined(WITH_OPENSSL)
 	{ KEX_CURVE25519_SHA256, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 },
-#endif /* HAVE_EVP_SHA256 */
+#endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */
 	{ NULL, -1, -1, -1},
 };