openssl-genrsa

Generate 2048-bit RSA key

$ openssl genrsa -out [private.key] 2048

$ openssl genrsa -out [private.key] 4096

$ openssl genrsa -aes256 -out [private.key] 2048

$ openssl genrsa 2048

openssl genrsa [options] [bits]

openssl genrsa generates RSA private keys. The key can optionally be encrypted with a passphrase. Common key sizes are 2048 and 4096 bits. Output is in PEM format by default.

-out file

Output file for private key.

Encrypt key with algorithm.

Password source for encryption.

Key size in bits (default 2048).

openssl(1), openssl-rsa(1)