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    The following form allows you to view linux man pages.

    Command:

    setkey_r

    
    
    

    SYNOPSIS

           #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
           #include <unistd.h>
    
           void encrypt(char block[64], int edflag);
    
           #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
           #include <stdlib.h>
    
           void setkey(const char *key);
    
           #define _GNU_SOURCE         /* See feature_test_macros(7) */
           #include <crypt.h>
    
           void setkey_r(const char *key, struct crypt_data *data);
           void encrypt_r(char *block, int edflag, struct crypt_data *data);
    
           Each of these requires linking with -lcrypt.
    
    
    

    DESCRIPTION

           These  functions  encrypt  and  decrypt  64-bit messages.  The setkey()
           function sets the key used by encrypt().  The key argument used here is
           an  array  of  64 bytes, each of which has numerical value 1 or 0.  The
           bytes key[n] where n=8*i-1 are  ignored,  so  that  the  effective  key
           length is 56 bits.
    
           The  encrypt()  function modifies the passed buffer, encoding if edflag
           is 0, and decoding if 1 is being passed.  Like the key  argument,  also
           block  is  a  bit  vector  representation  of  the actual value that is
           encoded.  The result is returned in that same vector.
    
           These two functions are not reentrant, that is, the key data is kept in
           static storage.  The functions setkey_r() and encrypt_r() are the reen-
           trant versions.  They use the following structure to hold the key data:
    
               struct crypt_data {
                   char     keysched[16 * 8];
                   char     sb0[32768];
                   char     sb1[32768];
                   char     sb2[32768];
                   char     sb3[32768];
                   char     crypt_3_buf[14];
                   char     current_salt[2];
                   long int current_saltbits;
                   int      direction;
                   int      initialized;
               };
    
           Before calling setkey_r() set data->initialized to zero.
    
    
    

    RETURN VALUE

           These functions do not return any value.
    
    
    

    CONFORMING TO

           The  functions  encrypt()  and  setkey()  conform  to  SVr4, SUSv2, and
           POSIX.1-2001.  The functions encrypt_r() and setkey_r() are GNU  exten-
           sions.
    
    
    

    NOTES

           In glibc 2.2 these functions use the DES algorithm.
    
    
    

    EXAMPLE

           You  need to link with libcrypt to compile this example with glibc.  To
           do useful work the key[] and txt[] arrays must be filled with a  useful
           bit pattern.
    
           #define _XOPEN_SOURCE
           #include <unistd.h>
           #include <stdlib.h>
    
           int
           main(void)
           {
               char key[64];      /* bit pattern for key */
               char txt[64];      /* bit pattern for messages */
    
               setkey(key);
               encrypt(txt, 0);   /* encode */
               encrypt(txt, 1);   /* decode */
           }
    
    
    

    SEE ALSO

           cbc_crypt(3), crypt(3), ecb_crypt(3),
    
                                      2013-07-22                        ENCRYPT(3)
    
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