ffmpeg des

extern "C"
{
#include <libavutil/des.h>
}


    unsigned char key[] = "FDS5F46F5631DSV61DS11F1DAF16FDS5F46S1DFDS541F5631DSV61DS1F1DAF16";
    int keylen = strlen((char*)key);
    unsigned char data[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
    int datalen = strlen((char*)data);


    unsigned char buf_e[1024] = { 0 };
    unsigned char buf_d[1024] = { 0 };

    auto des = av_des_alloc();
    auto ret = av_des_init(des, key, keylen, 0);

    av_des_crypt(des, buf_e,data,64,nullptr, 0);
    ret = av_des_init(des, key, keylen, 1);
    av_des_crypt(des, buf_d, buf_e, 64, nullptr, 1);