encrypt(3) - wariua/manpages-ko GitHub Wiki

#define _XOPEN_SOURCE       /* feature_test_macros(7) 참고 */
#include <unistd.h>

void encrypt(char block[64], int edflag);

#define _XOPEN_SOURCE       /* feature_test_macros(7) 참고 */
#include <stdlib.h>

void setkey(const char *key);

#define _GNU_SOURCE         /* feature_test_macros(7) 참고 */
#include <crypt.h>

void setkey_r(const char *key, struct crypt_data *data);
void encrypt_r(char *block, int edflag, struct crypt_data *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;
};

#define _XOPEN_SOURCE
#include <stdio.h> #include <stdlib.h>
#include <unistd.h>
#include <crypt.h>

int
main(void)
{
    char key[64];
    char orig[9] = "eggplant";
    char buf[64];
    char txt[9];
    int i, j;

    for (i = 0; i < 64; i++) {
        key[i] = rand() & 1;
    }

    for (i = 0; i < 8; i++) {
        for (j = 0; j < 8; j++) {
            buf[i * 8 + j] = orig[i] >> j & 1;
        }
        setkey(key);
    }
    printf("Before encrypting: %s\n", orig);

    encrypt(buf, 0);
    for (i = 0; i < 8; i++) {
        for (j = 0, txt[i] = '\0'; j < 8; j++) {
            txt[i] |= buf[i * 8 + j] << j;
        }
        txt[8] = '\0';
    }
    printf("After encrypting:  %s\n", txt);

    encrypt(buf, 1);
    for (i = 0; i < 8; i++) {
        for (j = 0, txt[i] = '\0'; j < 8; j++) {
            txt[i] |= buf[i * 8 + j] << j;
        }
        txt[8] = '\0';
    }
    printf("After decrypting:  %s\n", txt);
    exit(EXIT_SUCCESS);
}