Sets an encoding key for use by the encrypt function.

    Format

      #include  <unistd.h>

      #include  <stdlib.h>

      void setkey  (const char *key;)

1  –  Argument

 key

    A character array of length 64 containing 0s and 1s.

2  –  Description

    The argument of setkey is a character array of length 64
    containing only the characters with numerical value 0 and 1.
    If this string is divided into groups of 8, the low-order bit in
    each group is ignored, leading to a 56-bit key which is set into
    the machine.

    No value is returned.

    See also crypt and encrypt.