linux c des encrypt and decrypt_c des_encrypt

des为块加密算法，数据长度必须为8的倍数，密钥长度为8：

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <rpc/des_crypt.h>
int main(int argc, char** argv){
        char c = '\x8';
        printf("%c\n",'\x8');//\转义符后面三位数表示8进制如\101为65，\x8则为十六进制，\95则为十制
        char data[4096]= "abcdefghijklmnopqrstuVW000000000";//des 加密，数据一定要是8的倍数，不补齐，密后做取舍
 
        //we must fix the data to a multiple of 8...
 
        char key[8] = "12345678";
        char key2[8] = "12345678";
        des_setparity(key);
        ecb_crypt(key,data,strlen(data),DES_ENCRYPT);
        printf("%s\n",data);
 
        des_setparity(key2);
        ecb_crypt(key,data,strlen(data),DES_DECRYPT);
        printf("%s\n",data);
 
        return 0;
}

[xxx@localhost code]$ gcc -g -lcrypt destest.c 
[xxx@localhost code]$ ./a.out 
.Ck玫??9.PhQg?.?j}R.O9
abcdefghijklmnopqrstuVW000000000
[xxx@localhost code]$