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Annotation of 43BSDReno/foreign/man/crypt.0, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: 
        !             4: CRYPT(3)                     1986                       CRYPT(3)
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        !             6: 
        !             7: 
        !             8: NNAAMMEE
        !             9:      crypt, setkey, encrypt - DES encryption
        !            10: 
        !            11: SSYYNNOOPPSSIISS
        !            12:      cchhaarr **ccrryypptt((kkeeyy,, ssaalltt))
        !            13:      cchhaarr **kkeeyy,, **ssaalltt;;
        !            14: 
        !            15:      sseettkkeeyy((kkeeyy))
        !            16:      cchhaarr **kkeeyy;;
        !            17: 
        !            18:      eennccrryypptt((bblloocckk,, eeddffllaagg))
        !            19:      cchhaarr **bblloocckk;;
        !            20: 
        !            21: DDEESSCCRRIIPPTTIIOONN
        !            22:      _C_r_y_p_t is the password encryption routine.       It is based on
        !            23:      the NBS Data Encryption Standard, with variations intended
        !            24:      (among other things) to frustrate use of hardware implemen-
        !            25:      tations of the DES for key search.
        !            26: 
        !            27:      The first argument to _c_r_y_p_t is normally a user's typed pass-
        !            28:      word.  The second is a 2-character string chosen from the
        !            29:      set [a-zA-Z0-9./].  The _s_a_l_t string is used to perturb the
        !            30:      DES algorithm in one of 4096 different ways, after which the
        !            31:      password is used as the key to encrypt repeatedly a constant
        !            32:      string.  The returned value points to the encrypted pass-
        !            33:      word, in the same alphabet as the salt.  The first two char-
        !            34:      acters are the salt itself.
        !            35: 
        !            36:      The other entries provide (rather primitive) access to the
        !            37:      actual DES algorithm.  The argument of _s_e_t_k_e_y is a character
        !            38:      array of length 64 containing only the characters with
        !            39:      numerical value 0 and 1.  If this string is divided into
        !            40:      groups of 8, the low-order bit in each group is ignored,
        !            41:      leading to a 56-bit key which is set into the machine.
        !            42: 
        !            43:      The argument to the _e_n_c_r_y_p_t entry is likewise a character
        !            44:      array of length 64 containing 0's and 1's.  The argument
        !            45:      array is modified in place to a similar array representing
        !            46:      the bits of the argument after having been subjected to the
        !            47:      DES algorithm using the key set by _s_e_t_k_e_y. The _e_d_f_l_a_g flag
        !            48:      is ignored; the argument can only be encrypted.
        !            49: 
        !            50: SSEEEE AALLSSOO
        !            51:      passwd(1), passwd(5), login(1), getpass(3)
        !            52: 
        !            53: BBUUGGSS
        !            54:      The return value points to static data whose content is
        !            55:      overwritten by each call.
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        !            62: 
        !            63: Printed 10/21/90            August                             1
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