source: ecs_cellMon/tools/FileEncrypt/src/main.c @ 7

#include <stdio.h>
#include <string.h>
#include "aes.h"
//#include "crc.h"

#define MAX_LENGH       (2 * 1024 * 1024) // muss durch 16 teilbar. Da AES auf 16Bit Buffer eingestellt, eventuell änderbar

#define MAX_PATH        255

uint8_t input[MAX_LENGH];
uint8_t output[MAX_LENGH];

uint8_t key[16] = { 0x5c, 0x38, 0x36, 0x57, 0x60, 0x3d, 0x0e, 0x38, 0x61, 0x1e, 0x4e, 0x21, 0x62, 0x19, 0x47, 0x62 };

int main(int argc, char *argv[])
{

        int i=0;
        FILE *fp= NULL;
        int c=0;
        int filePos=0;
        uint32_t fileSize=0;
        char outputFilename[MAX_PATH] = "";
        //uint16_t crc=0;

        //uint16_t hw_id;
        //uint16_t fw_major;
        //uint16_t fw_minor;
        //uint16_t fw_build;

        printf("Starting file %s.\n", argv[0]);

        memset(input,0xFF,MAX_LENGH);
        memset(output,0xFF,MAX_LENGH);

        if (argc < 2)
        {
                printf("Was soll ich den verschluesseln?\nDu hast vergessen einen Dateinahmen anzugeben!\n");
                printf("Bitte gib es z.B. so ein: FileEncrypt abc.bin\n");
                printf("LG Falko\n");
                return 0;
        }

        //printf ("Bitte geben Sie die Hardware ID ein: ");
        //scanf ("%hu", &hw_id);

        //printf ("Bitte geben Sie die Firmware Version  ein, Major: ");
        //scanf ("%hu", &fw_major);

        //printf ("Bitte geben Sie die Firmware Version  ein, Minor: ");
        //scanf ("%hu", &fw_minor);

        //printf ("Bitte geben Sie die Firmware Version  ein, Build: ");
        //scanf ("%hu", &fw_build);


        // oeffnen im Lesemodus
        fp = fopen(argv[1], "rb");

        if(fp == NULL)
        {
                printf("Cannot open firmware file %s!\n", argv[1]);
                fflush(stdout);
                return -1;
        }

         printf("Loading file %s\n", argv[1]);
         fflush(stdout);
    do
    {
      c = fgetc (fp);
      if (c == EOF) break;
      input[filePos] = c;
      //crc= update_crc_16(crc, c );
      filePos++;
      if (filePos > (MAX_LENGH-1))
      {
                printf("Datei zu groß für aktuellen Buffer\n");fflush(stdout);
                return -2;
      }

    } while (1);


    fclose (fp);

    fileSize = filePos;


    // --- ENDE DATEI EINLESEN ----


    fflush(stdout);

    // print the resulting cipher as 4 x 16 byte strings
    printf("Encrypting file...\n");
    fflush(stdout);

    for(i = 0; i <  (MAX_LENGH / 16); ++i)
    {
        AES128_ECB_encrypt(input + (i*16), key, output+(i*16));
    }

    //Datei schreiben - verschlüsselt
        //oeffnen im schreibmodus, binär
    //strcat (outputFilename, "encrypted_");
    strcat(outputFilename, argv[1]);
    // Let's find last '/' or '\' in path
    char* fn = NULL;
    if (!((fn = strrchr(outputFilename, '/')) || (fn = strrchr(outputFilename, '\\'))))
        {
        printf("Cannot find filename in %s", argv[1]);
        return -4;
    }
    // Moving pointer to the beginning of the real file name
    fn++;
    char filename[MAX_PATH] = "";
    strcpy(filename, fn);
    char dir[MAX_PATH] = "";
    strncat(dir, outputFilename, fn - outputFilename);
    char new_filename[255] = "";
    strcpy(new_filename, "encrypted_");
    strcat(new_filename, filename);
    strcat(dir, new_filename);

    printf("Writing file %s\n", dir);
    fflush(stdout);

        fp = fopen(dir, "wb");

        if(fp == NULL)
        {
                printf("File %s cannot be written!\n", dir);
                return -3;
        }

        filePos=0;
    do
    {
      c = output[filePos];
      fputc (c, fp);
      filePos++;
    } while (filePos < fileSize);
    fclose (fp);


    printf ("Bootloader file generated!\n");
    printf ("Bin file size:\t\t\t\t %d\n", fileSize);
    //printf ("HW Id:\t\t\t\t\t %d\n", hw_id );
    //printf ("FW Version:\t\t\t\t %d.%d.%d\n", fw_major, fw_minor, fw_build );
    printf ("Used Key for AES 128 Bit encryption:\t ");
    phex(key,15);
    //printf ("Calculated CRC:\t\t\t\t %x\n", crc);
    printf("Finished!\n");
    fflush(stdout);

        return 0;
}