The openssl utility can directly use an RSA key from OpenSSH to encrypt a file. You can also generate signed checksums. I'm assuming that the openssl command l

The openssl utility can directly use an RSA key from OpenSSH to encrypt a file. You can also generate signed checksums. I'm assuming that the openssl command line utility is more easily found than "age" (which I have never used). https://www.linuxjournal.com/content/flat-file-encryption-openssl-and-gpg https://www.linuxjournal.com/content/flat-file-encryption-op...