I practicing on OpenSSL and Nginx.
I created my local root CA, and used it to sign my local server.
I made sure to use SHA3-512 to sign any certificate, it is indicated in my openssl.cnf file
default_md = sha3-256
When I run sudo nginx -t however, I get this
024/08/16 18:59:19 [emerg] 26144#26144: SSL_CTX_use_certificate("/etc/nginx/pki/pkix/rootCA/certs/server.pem") failed (SSL: error:0A00018E:SSL routines::ca md too weak)
I cannot see how SHA3-256 is weak!