> `openssl help` does work on OSX (I literally just tested it).
For anyone else interested, I just tested it as well. It appears that it prints a listing of all the commands offered by openssl (split into sections "Standard commands", "Message Digest commands", and "Cipher commands"), with no other descriptions or usage instructions. I tried `openssl help bf` to get more information, and it prints the options available to that command and their descriptions. I did not see any way to actually figure out what a command does, but it is possible I missed it.
For anyone else interested, I just tested it as well. It appears that it prints a listing of all the commands offered by openssl (split into sections "Standard commands", "Message Digest commands", and "Cipher commands"), with no other descriptions or usage instructions. I tried `openssl help bf` to get more information, and it prints the options available to that command and their descriptions. I did not see any way to actually figure out what a command does, but it is possible I missed it.