openssl genpkey

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

• Generate an RSA private key of 2048 bits, saving it to a specific file:

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

• Generate an elliptic curve private key using the curve prime256v1, saving it to a specific file:

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

• Generate an ED25519 elliptic curve private key, saving it to a specific file:

openssl genpkey -algorithm ED25519 -out filename.key