Usage: nettle-pbkdf2 [OPTIONS] SALT
Options:
  --help                 Show this help.
  -V, --version          Show version information.
  -i, --iterations=COUNT Desired iteration count (default 10000).
  -l, --length=LENGTH    Desired output length (octets, default 16)
  --raw                  Raw binary output.
  --hex-salt             Use hex encoding for the salt.