openssl genpkey

OpenSSL command to generate asymmetric key pairs. More information: https://www.openssl.org/docs/manmaster/man1/openssl-genpkey.html.

openssl genpkey -algorithm rsa -pkeyopt rsa_keygen_bits:2048 -out filename.key

openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:prime256v1 -out filename.key

openssl genpkey -algorithm ED25519 -out filename.key