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des_crypt, ecb_crypt, cbc_crypt, des_setparity - fast DES encryption



      des_crypt, ecb_crypt, cbc_crypt, des_setparity - fast DES encryption


      Standard C Library (libc, -lc)


      #include <rpc/des_crypt.h>
      ecb_crypt(char *key, char *data, unsigned datalen, unsigned mode);
      cbc_crypt(char *key, char *data, unsigned datalen, unsigned mode,
              char *ivec);
      des_setparity(char *key);


      The ecb_crypt() and cbc_crypt() functions implement the NBS DES (Data
      Encryption Standard).  These routines are faster and more general purpose
      than crypt(3).  They also are able to utilize DES hardware if it is
      available.  The ecb_crypt() function encrypts in ECB (Electronic Code
      Book) mode, which encrypts blocks of data independently.  The cbc_crypt()
      function encrypts in CBC (Cipher Block Chaining) mode, which chains
      together successive blocks.  CBC mode protects against insertions, dele‐
      tions and substitutions of blocks.  Also, regularities in the clear text
      will not appear in the cipher text.
      Here is how to use these routines.  The first argument, key, is the
      8-byte encryption key with parity.  To set the key’s parity, which for
      DES is in the low bit of each byte, use des_setparity().  The second
      argument, data, contains the data to be encrypted or decrypted.  The
      third argument, datalen, is the length in bytes of data, which must be a
      multiple of 8.  The fourth argument, mode, is formed by OR’ing together
      some things.  For the encryption direction OR in either DES_ENCRYPT or
      DES_DECRYPT.  For software versus hardware encryption, OR in either
      DES_HW or DES_SW.  If DES_HW is specified, and there is no hardware, then
      the encryption is performed in software and the routine returns
      DESERR_NOHWDEVICE.  For cbc_crypt(), the ivec argument is the 8-byte ini‐
      tialization vector for the chaining.  It is updated to the next initial‐
      ization vector upon return.


      [DESERR_NONE]        No error.
      [DESERR_NOHWDEVICE]  Encryption succeeded, but done in software instead
                           of the requested hardware.
      [DESERR_HWERR]       An error occurred in the hardware or driver.
      [DESERR_BADPARAM]    Bad argument to routine.
      Given a result status stat, the macro DES_FAILED(stat) is false only for
      the first two statuses.


      These routines are not available in RPCSRC 4.0.  This information is pro‐
      vided to describe the DES interface expected by Secure RPC.


Based on BSD UNIX
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