linux c des encrypt and decrypt

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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.O9abcdefghijklmnopqrstuVW000000000[xxx@localhost code]$

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