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openssl genrsa — OpenSSL command to generate RSA private keys. More information: <https://docs.openssl.org/master/man

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandrsaopensslcliopenssl genrsagenerateprivate

Problem

How to use the openssl genrsa command: OpenSSL command to generate RSA private keys. More information: <https://docs.openssl.org/master/man1/openssl-genrsa/>.

Solution

openssl genrsa — OpenSSL command to generate RSA private keys. More information: <https://docs.openssl.org/master/man1/openssl-genrsa/>.

Generate an RSA private key of 2048 bits to stdout:

openssl genrsa

Save an RSA private key of an arbitrary number of bits to the output file:

openssl genrsa -out {{output_file.key}} {{1234}}

Generate an RSA private key and encrypt it with AES256 (you will be prompted for a passphrase):

openssl genrsa {{-aes256}}

Code Snippets

Generate an RSA private key of 2048 bits to `stdout`

openssl genrsa

Save an RSA private key of an arbitrary number of bits to the output file

openssl genrsa -out {{output_file.key}} {{1234}}

Generate an RSA private key and encrypt it with AES256 (you will be prompted for a passphrase)

openssl genrsa {{-aes256}}

Context

tldr-pages: common/openssl genrsa

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