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#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SCR_SIZE 8
#define CSD_SIZE 16
#define CID_SIZE 16
#define KEY_SIZE 16
unsigned char twiddle(unsigned char buf[2])
{
unsigned char c = 0;
if (isdigit(buf[0])) {
c = buf[0];
} else if (isupper(buf[0])) {
c = buf[0] - 0x37;
} else if (islower(buf[0])) {
c = buf[0] - 0x57;
}
c *= 0x10;
if (isdigit(buf[1])) {
c |= buf[1] - 0x30;
} else if (isupper(buf[1])) {
c |= buf[1] - 0x37;
} else if (islower(buf[1])) {
c |= buf[1] + 0xa9;
}
return c;
}
void get_sd_register(const char *dev, const char *reg, size_t n, unsigned char buf[n])
{
char path[256];
snprintf(path, sizeof(path), "/sys/block/%s/device/%s", dev, reg);
FILE *f = fopen(path, "r");
if (f == NULL) {
return;
}
for (size_t i = 0; i < n; i++) {
unsigned char hex[2];
fread(hex, 2, 1, f);
buf[i] = twiddle(hex);
}
fclose(f);
}
unsigned char * getkey(const char *dev)
{
static unsigned char key[KEY_SIZE];
const unsigned char keycode[] = "eone";
size_t codelen = sizeof(keycode) - 1;
unsigned char scr[SCR_SIZE] = "testtest";
unsigned char csd[CSD_SIZE] = "testtesttesttest";
unsigned char cid[CID_SIZE] = "testtesttesttest";
get_sd_register(dev, "cid", sizeof(cid), cid);
get_sd_register(dev, "csd", sizeof(csd), csd);
get_sd_register(dev, "scr", sizeof(scr), scr);
memcpy(key, cid + 3, 10);
memcpy(key + 10, csd + 7, 3);
key[13] = scr[0];
memcpy(key + 0xe, scr + 2, 2);
for (size_t i = 0; i < KEY_SIZE; i++) {
if (i < codelen) {
key[i] += keycode[i];
} else {
key[i] += i - (codelen - 1);
}
}
return key;
}
int main(void)
{
unsigned char *key = getkey("mmcblk0");
printf("calculated:");
for (size_t i = 0; i < KEY_SIZE; i++) {
printf(" %02hhx", key[i]);
}
printf("\n");
}
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