Update cheatsheets

openssl-genpkey

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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}}`