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des_crypt(3) - DES_FAILED, cbc_crypt, des_crypt, des_setparity, ecb_crypt, DES_FAILED, cbc_crypt, des_crypt, des_setparity, ecb_crypt - fast DES encryption - man 3 des_crypt

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DES_CRYPT(3)                                                      DES_CRYPT(3)



NAME
       des_crypt,  ecb_crypt,  cbc_crypt, des_setparity, DES_FAILED - fast DES
       encryption

SYNOPSIS
       #include <rpc(3,5,8)/des_crypt.h>

       int ecb_crypt(char *key, char *data, unsigned datalen,
                     unsigned mode);

       int cbc_crypt(char *key, char *data, unsigned datalen,
                     unsigned mode, char *ivec);

       void des_setparity(char *key);

       int DES_FAILED(int status);

DESCRIPTION
       ecb_crypt() and cbc_crypt() 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(3,n) it  is  avail-
       able.   ecb_crypt()  encrypts in(1,8) ECB (Electronic Code Book) mode, which
       encrypts blocks of data independently.   cbc_crypt()  encrypts  in(1,8)  CBC
       (Cipher  Block Chaining) mode, which chains together successive blocks.
       CBC mode protects against insertions, deletions  and  substitutions  of
       blocks.  Also,  regularities  in(1,8)  the clear(1,3x,3x clrtobot) text will not appear in(1,8) the
       cipher text.

       Here is how to use these routines.  The first parameter,  key,  is  the
       8-byte  encryption key with parity.  To set(7,n,1 builtins) the key's parity, which for
       DES is in(1,8) the low bit of each  byte,  use  des_setparity.   The  second
       parameter,  data,  contains  the data to be encrypted or decrypted. The
       third parameter, datalen, is the length in(1,8) bytes of data, which must be
       a  multiple  of  8.  The  fourth  parameter,  mode, is formed by OR'ing
       together some things.  For the  encryption  direction  'or'  in(1,8)  either
       DES_ENCRYPT  or  DES_DECRYPT.  For software versus hardware encryption,
       'or' in(1,8) either DES_HW or DES_SW.  If DES_HW is specified, and there  is
       no  hardware, then the encryption is performed in(1,8) software and the rou-
       tine returns DESERR_NOHWDEVICE.  For cbc_crypt, the parameter  ivec  is
       the  the  8-byte initialization vector for the chaining.  It is updated
       to the next initialization vector upon return.


SEE ALSO
       des(1), crypt(3) and xcrypt(3)

DIAGNOSTICS
       DESERR_NONE         No error.
       DESERR_NOHWDEVICE   Encryption succeeded, but done in(1,8) software  instead
                           of the requested hardware.
       DESERR_HWERROR      An error(8,n) occurred in(1,8) the hardware or driver.
       DESERR_BADPARAM     Bad parameter to routine.

       Given  a  result  status stat(1,2), the macro DES_FAILED(stat(1,2)) is false only
       for the first two statuses.


AVAILABILITY
       These routines are present in(1,8) libc 4.6.27 and later, and in(1,8)  glibc  2.1
       and later.



                                6 October 1987                    DES_CRYPT(3)

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