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#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include "deonebook.h"
#define SCR_SIZE 8
#define CSD_SIZE 16
#define CID_SIZE 16
#define KEY_SIZE 16
static 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;
}
static bool get_sd_register(int dirfd, const char *reg, size_t n, unsigned char buf[n])
{
int fd = openat(dirfd, reg, O_RDONLY);
if (fd == -1) {
return false;
}
for (size_t i = 0; i < n; i++) {
unsigned char hex[2];
read(fd, hex, sizeof(hex));
buf[i] = twiddle(hex);
}
close(fd);
return true;
}
unsigned char * genkey(int dirfd)
{
static unsigned char key[KEY_SIZE];
const unsigned char keycode[] = "eone";
size_t codelen = sizeof(keycode) - 1;
bool allread = true;
unsigned char scr[SCR_SIZE] = "testtest";
unsigned char csd[CSD_SIZE] = "testtesttesttest";
unsigned char cid[CID_SIZE] = "testtesttesttest";
if (!get_sd_register(dirfd, "cid", sizeof(cid), cid)) {
fprintf(stderr, "warning: CID register not read\n");
allread = false;
}
if (!get_sd_register(dirfd, "csd", sizeof(csd), csd)) {
fprintf(stderr, "warning: CSD register not read\n");
allread = false;
}
if (!get_sd_register(dirfd, "scr", sizeof(scr), scr)) {
fprintf(stderr, "warning: SCR register not read\n");
allread = false;
}
if (!allread) {
fprintf(stderr, "warning: key may be incorrect\n");
}
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;
}
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