NAME
        ACrypt -- Encrypt a password

   SYNOPSIS
        newpass = ACrypt( buffer, password, username )

        ubyte *acrypt( ubyte *, ubyte *, ubyte *) ;

   FUNCTION
        This function takes a buffer of at least 12 characters in length,
        an unencrypted password and the user's name (as known to the host
        system) and returns an encrypted password in the passed buffer.
        This is a one-way encryption. Normally, the user's encrypted
        password is stored in a file for future password comparison.

   INPUTS
        buffer     - a pointer to a buffer at least 12 bytes in length.
        password   - a pointer to an unencrypted password string.
        username   - a pointer to the user's name.

   RESULT
        newpass    - a pointer to the passed buffer if successful, NULL
                     upon failure. The encrypted password placed in the
                     buffer will be be eleven (11) characters in length
                     and will be NULL-terminated.

   EXAMPLE

        ubyte *pw, *getpassword() ;
        ubyte *user = "alf"
        ubyte *newpass ;
        ubyte buffer[16] ;         /* size >= 12 */

        pw = getpassword() ;   /* your own function */

        if((newpass = ACrypt(buffer, pw, user)) != NULL)
        {
                printf("pw = %sn", newpass) ; /* newpass = &buffer[0] */
        }
        else
        {
                printf("ACrypt failedn") ;
        }