openssl-genpkey

OpenSSL command to generate asymmetric key pairs.

TLDR

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

$ openssl genpkey -algorithm [ED25519] -out [filename.key]
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