Usage: pyrsa-sign [options] private_key hash_method

Signs a file, outputs the signature. Choose the hash method from MD5, SHA-1, SHA-224, SHA-256,
SHA-384, SHA-512, SHA3-256, SHA3-384, SHA3-512

Options:
  -h, --help            show this help message and exit
  -i INPUT, --input=INPUT
                        Name of the file to sign. Reads from stdin if not specified.
  -o OUTPUT, --output=OUTPUT
                        Name of the file to write the signature to. Written to stdout if this
                        option is not present.
  --keyform=KEYFORM     Key format of the private key - default PEM