des_crypt(3)               Library Functions Manual               des_crypt(3)

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

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #include <rpc/des_crypt.h>

       int ecb_crypt(char *key, char data[.datalen], unsigned int datalen,
                     unsigned int mode);
       int cbc_crypt(char *key, char data[.datalen], unsigned int datalen,
                     unsigned int 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 it  is  avail-
       able.   ecb_crypt()  encrypts in ECB (Electronic Code Book) mode, which
       encrypts blocks of data independently.   cbc_crypt()  encrypts  in  CBC
       (Cipher  Block Chaining) mode, which chains together successive blocks.
       CBC mode protects against insertions, deletions, 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 ORing to-
       gether some things.  For the encryption direction OR in either  DES_EN-
       CRYPT  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 hard-
       ware,  then the encryption is performed in software and the routine re-
       turns DESERR_NOHWDEVICE.  For cbc_crypt(), the  argument  ivec  is  the
       8-byte  initialization  vector  for the chaining.  It is updated to the
       next initialization vector upon return.

RETURN VALUE
       DESERR_NONE
              No error.

       DESERR_NOHWDEVICE
              Encryption succeeded, but done in software instead  of  the  re-
              quested hardware.

       DESERR_HWERROR
              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.

VERSIONS
       These functions were added in glibc 2.1.

       Because they employ the DES block cipher, which is no longer considered
       secure,  ecb_crypt(),  ecb_crypt(), crypt_r(), and des_setparity() were
       removed in glibc 2.28.  Applications should switch to a modern cryptog-
       raphy library, such as libgcrypt.

ATTRIBUTES
       For  an  explanation  of  the  terms  used  in  this  section,  see at-
       tributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |ecb_crypt(), cbc_crypt(), des_setparity()   | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+

STANDARDS
       4.3BSD.  Not in POSIX.1.

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

Linux man-pages 6.03              2022-12-15                      des_crypt(3)

Czas wygenerowania: 0.00035 sek.

Created with the man page lookup class by Andrew Collington.
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Some optimisations by Eli Argon
Caching idea and code contribution by James Richardson

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