    CRYPT(III)                   4/30/73                   CRYPT(III)

    NAME
         crypt - password encoding

    SYNOPSIS
         mov  $key,r0
         jsr  pc,crypt

         char *crypt(key)
         char *key;

    DESCRIPTION
         On  entry, r0 points to a string of characters terminated by
         an ASCII NUL.  The routine performs an operation on the  key
         which  is  difficult to invert (i.e. encrypts it) and leaves
         the resulting eight bytes of ASCII alphanumerics in a global
         cell called ``word''.

         From  C, the key argument is a string and the value returned
         is a pointer to the eight-character result.

         This routine is used to encrypt all passwords.

    SEE ALSO
         passwd(I), passwd(V), login(I)

    BUGS
         Short or otherwise simple passwords can be decrypted  easily
         by  exhaustive  search.  Six characters of gibberish is rea-
         sonably safe.

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