Update cheatsheets

openssl-genrsa

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openssl genrsa
+
+> OpenSSL command to generate RSA private keys.
+> More information: <https://www.openssl.org/docs/manmaster/man1/openssl-genrsa.html>.
+
+- 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}}`