mcrypt failure?

[Richard L. Hamilton]

Attempting
mcrypt  -a  enigma  --keymode  scrypt --bare --decrypt </tmp/test

with a file containing "testing\n" and encrypted (via old Unix crypt(1)) with key "abcdefg", I get the response

File /tmp/test was NOT decrypted successfully.

The same procedure works on CentOS, Ubuntu, and Cygwin, at least.  Why is it failing with the MacPorts installation of mcrypt (on Sierra)?

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