int hex2bin(unsigned char *ib, unsigned char *ob)
/* convert a \0 terminated string of hex digits into the binary repr.
and returns the number of bytes created.
ib and ob may be the same buffer ! */
{
int i=0;
unsigned char val = 0;
#define HEX2BIN(x) \
((x) <= '9' ? (x)-'0' :\
(x) >= 'a' && (x) <= 'f' ? (x)-'a'+10 : (x)-'A'-10)
while (*ib) {
if (i%2)
*ob++ = (val<<4) | HEX2BIN(*ib);
else
val = HEX2BIN(*ib);
i++;
ib++;
}
if (i%2) {
/* we got an odd number of hexdigits - quietly assume a trailing 0 */
*ob = val<<4;
i++;
}
return i/2;
}
int hex2bin(char *str, char **hex) {
char *ptr;
int i, l = strlen(str);
if (l & 1)
return 0;
*hex = malloc(l / 2);
ptr = *hex;
if (!ptr)
return 0;
for (i = 0; i < l; i += 2)
*ptr++ = (HEX2BIN(str[i]) << 4) | HEX2BIN(str[i+1]);
return l / 2;
}
// Read a hexadecimal string from the user to use as the initial seed in the
// key generation routine. If the hex-string is less than 72 bytes, then the
// input key will be extended to fill the full key length. If the length is
// greater than 72 bytes, then the key will be compacted by XORing the remaining
// bytes with the existing bytes in a round-robin approach.
int get_input() {
int idx;
bool ok = false;
while (!ok) {
printf("Enter seed-key in hexadecimal (Ex: 573BE15A): ");
// Read line from stdin
char* line = NULL;
size_t len = 0;
if (getline(&line, &len, stdin) == -1)
PRINT_RETURN("Could not read line\n", -1);
strtok(line, "\r\n");
// Verify that the key is okay
int clen = strlen(line);
ok = (clen > 0);
for (idx = 0; idx < clen; idx++)
ok = (ok && isxdigit(line[idx]));
// Parse the key (handles key extending and compacting)
int klen = sizeof(arr_key);
memset(arr_key, '\0', klen);
uint8_t* _arr_key = (uint8_t*)arr_key;
if (ok) {
for (idx = 0; idx < MAX(clen, klen*2); idx++) {
int shift = (idx%2) ? 0 : 4;
_arr_key[(idx/2) % klen] ^= HEX2BIN(line[idx % clen]) << shift;
}
}
free(line);
}
return 0;
}
/**
* return 4-bit checksum of product
*
* product[] : 12-byte string
*
*/
uint32_t chksum(char product[]) {
uint32_t sum = 16;
int i;
for (i = 0; i < PRODUCT_NBR_LEN - 1; i++) {
sum += HEX2BIN(product[i]);
sum = (sum >= 17) ? (sum - 16) : sum;
sum <<= 1;
sum = (sum >= 17) ? (sum - 17) : sum;
}
sum = (17 - sum);
return (sum != 16) ? sum : 0;
}
int
RTMP_HashSWF(const char *url, unsigned int *size, unsigned char *hash,
int age) {
FILE *f = NULL;
char *path, date[64], cctim[64];
long pos = 0;
time_t ctim = -1, cnow;
int i, got = 0, ret = 0;
unsigned int hlen;
struct info in = {0};
struct HTTP_ctx http = {0};
HTTPResult httpres;
z_stream zs = {0};
AVal home, hpre;
date[0] = '\0';
#ifdef _WIN32
#ifdef XBMC4XBOX
hpre.av_val = "Q:";
hpre.av_len = 2;
home.av_val = "\\UserData";
#else
hpre.av_val = getenv("HOMEDRIVE");
hpre.av_len = strlen(hpre.av_val);
home.av_val = getenv("HOMEPATH");
#endif
#define DIRSEP "\\"
#else /* !_WIN32 */
hpre.av_val = "";
hpre.av_len = 0;
home.av_val = getenv("HOME");
#define DIRSEP "/"
#endif
if (!home.av_val)
home.av_val = ".";
home.av_len = strlen(home.av_val);
/* SWF hash info is cached in a fixed-format file.
* url: <url of SWF file>
* ctim: HTTP datestamp of when we last checked it.
* date: HTTP datestamp of the SWF's last modification.
* size: SWF size in hex
* hash: SWF hash in hex
*
* These fields must be present in this order. All fields
* besides URL are fixed size.
*/
path = malloc(hpre.av_len + home.av_len + sizeof(DIRSEP ".swfinfo"));
sprintf(path, "%s%s" DIRSEP ".swfinfo", hpre.av_val, home.av_val);
f = fopen(path, "r+");
while (f) {
char buf[4096], *file, *p;
file = strchr(url, '/');
if (!file)
break;
file += 2;
file = strchr(file, '/');
if (!file)
break;
file++;
hlen = file - url;
p = strrchr(file, '/');
if (p)
file = p;
else
file--;
while (fgets(buf, sizeof(buf), f)) {
char *r1;
got = 0;
if (strncmp(buf, "url: ", 5))
continue;
if (strncmp(buf + 5, url, hlen))
continue;
r1 = strrchr(buf, '/');
i = strlen(r1);
r1[--i] = '\0';
if (strncmp(r1, file, i))
continue;
pos = ftell(f);
while (got < 4 && fgets(buf, sizeof(buf), f)) {
if (!strncmp(buf, "size: ", 6)) {
*size = strtol(buf + 6, NULL, 16);
got++;
}
else if (!strncmp(buf, "hash: ", 6)) {
unsigned char *ptr = hash, *in = (unsigned char *) buf + 6;
int l = strlen((char *) in) - 1;
for (i = 0; i < l; i += 2)
*ptr++ = (HEX2BIN(in[i]) << 4) | HEX2BIN(in[i + 1]);
got++;
}
else if (!strncmp(buf, "date: ", 6)) {
buf[strlen(buf) - 1] = '\0';
strncpy(date, buf + 6, sizeof(date));
got++;
}
else if (!strncmp(buf, "ctim: ", 6)) {
buf[strlen(buf) - 1] = '\0';
ctim = make_unix_time(buf + 6);
got++;
}
else if (!strncmp(buf, "url: ", 5))
break;
}
break;
}
break;
}
cnow = time(NULL);
/* If we got a cache time, see if it's young enough to use directly */
if (age && ctim > 0) {
ctim = cnow - ctim;
ctim /= 3600 * 24; /* seconds to days */
if (ctim < age) /* ok, it's new enough */
goto out;
}
in.first = 1;
HMAC_setup(in.ctx, "Genuine Adobe Flash Player 001", 30);
inflateInit(&zs);
in.zs = &zs;
http.date = date;
http.data = ∈
httpres = HTTP_get(&http, url, swfcrunch);
inflateEnd(&zs);
if (httpres != HTTPRES_OK && httpres != HTTPRES_OK_NOT_MODIFIED) {
ret = -1;
if (httpres == HTTPRES_LOST_CONNECTION)
RTMP_Log(RTMP_LOGERROR, "%s: connection lost while downloading swfurl %s",
__FUNCTION__, url);
else if (httpres == HTTPRES_NOT_FOUND)
RTMP_Log(RTMP_LOGERROR, "%s: swfurl %s not found", __FUNCTION__, url);
else
RTMP_Log(RTMP_LOGERROR, "%s: couldn't contact swfurl %s (HTTP error %d)",
__FUNCTION__, url, http.status);
}
else {
if (got && pos)
fseek(f, pos, SEEK_SET);
else {
char *q;
if (!f)
f = fopen(path, "w");
if (!f) {
int err = errno;
RTMP_Log(RTMP_LOGERROR,
"%s: couldn't open %s for writing, errno %d (%s)",
__FUNCTION__, path, err, strerror(err));
ret = -1;
goto out;
}
fseek(f, 0, SEEK_END);
q = strchr(url, '?');
if (q)
i = q - url;
else
i = strlen(url);
fprintf(f, "url: %.*s\n", i, url);
}
strtime(&cnow, cctim);
fprintf(f, "ctim: %s\n", cctim);
if (!in.first) {
HMAC_finish(in.ctx, hash, hlen);
*size = in.size;
fprintf(f, "date: %s\n", date);
fprintf(f, "size: %08x\n", in.size);
fprintf(f, "hash: ");
for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
fprintf(f, "%02x", hash[i]);
fprintf(f, "\n");
}
}
HMAC_close(in.ctx);
out:
free(path);
if (f)
fclose(f);
return ret;
}
