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authorDiego Biurrun <diego@biurrun.de>2013-02-06 00:44:00 +0100
committerDiego Biurrun <diego@biurrun.de>2013-02-06 09:48:51 +0100
commit48a4ffa722c0874b251de9d201babed52cef0bcb (patch)
tree2648a734acbd1963f3971bf3af77edef5a675377 /libavformat/asfcrypt.c
parent77bcb89600e79fbf37d4b739480813ef03292c5b (diff)
asf: K&R formatting cosmetics
Diffstat (limited to 'libavformat/asfcrypt.c')
-rw-r--r--libavformat/asfcrypt.c62
1 files changed, 36 insertions, 26 deletions
diff --git a/libavformat/asfcrypt.c b/libavformat/asfcrypt.c
index 6c48a1967a..c261475848 100644
--- a/libavformat/asfcrypt.c
+++ b/libavformat/asfcrypt.c
@@ -20,10 +20,10 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/common.h"
-#include "libavutil/intreadwrite.h"
#include "libavutil/bswap.h"
+#include "libavutil/common.h"
#include "libavutil/des.h"
+#include "libavutil/intreadwrite.h"
#include "libavutil/rc4.h"
#include "asfcrypt.h"
@@ -32,7 +32,8 @@
* @param v number to invert, must be odd!
* @return number so that result * v = 1 (mod 2^32)
*/
-static uint32_t inverse(uint32_t v) {
+static uint32_t inverse(uint32_t v)
+{
// v ^ 3 gives the inverse (mod 16), could also be implemented
// as table etc. (only lowest 4 bits matter!)
uint32_t inverse = v * v * v;
@@ -50,7 +51,8 @@ static uint32_t inverse(uint32_t v) {
* @param keys output key array containing the keys for encryption in
* native endianness
*/
-static void multiswap_init(const uint8_t keybuf[48], uint32_t keys[12]) {
+static void multiswap_init(const uint8_t keybuf[48], uint32_t keys[12])
+{
int i;
for (i = 0; i < 12; i++)
keys[i] = AV_RL32(keybuf + (i << 2)) | 1;
@@ -61,7 +63,8 @@ static void multiswap_init(const uint8_t keybuf[48], uint32_t keys[12]) {
* the other way round.
* @param keys key array of ints to invert
*/
-static void multiswap_invert_keys(uint32_t keys[12]) {
+static void multiswap_invert_keys(uint32_t keys[12])
+{
int i;
for (i = 0; i < 5; i++)
keys[i] = inverse(keys[i]);
@@ -69,23 +72,25 @@ static void multiswap_invert_keys(uint32_t keys[12]) {
keys[i] = inverse(keys[i]);
}
-static uint32_t multiswap_step(const uint32_t keys[12], uint32_t v) {
+static uint32_t multiswap_step(const uint32_t keys[12], uint32_t v)
+{
int i;
v *= keys[0];
for (i = 1; i < 5; i++) {
- v = (v >> 16) | (v << 16);
+ v = (v >> 16) | (v << 16);
v *= keys[i];
}
v += keys[5];
return v;
}
-static uint32_t multiswap_inv_step(const uint32_t keys[12], uint32_t v) {
+static uint32_t multiswap_inv_step(const uint32_t keys[12], uint32_t v)
+{
int i;
v -= keys[5];
for (i = 4; i > 0; i--) {
v *= keys[i];
- v = (v >> 16) | (v << 16);
+ v = (v >> 16) | (v << 16);
}
v *= keys[0];
return v;
@@ -99,17 +104,19 @@ static uint32_t multiswap_inv_step(const uint32_t keys[12], uint32_t v) {
* @param data data to encrypt
* @return encrypted data
*/
-static uint64_t multiswap_enc(const uint32_t keys[12], uint64_t key, uint64_t data) {
+static uint64_t multiswap_enc(const uint32_t keys[12],
+ uint64_t key, uint64_t data)
+{
uint32_t a = data;
uint32_t b = data >> 32;
uint32_t c;
uint32_t tmp;
- a += key;
- tmp = multiswap_step(keys , a);
- b += tmp;
- c = (key >> 32) + tmp;
+ a += key;
+ tmp = multiswap_step(keys, a);
+ b += tmp;
+ c = (key >> 32) + tmp;
tmp = multiswap_step(keys + 6, b);
- c += tmp;
+ c += tmp;
return ((uint64_t)c << 32) | tmp;
}
@@ -121,25 +128,28 @@ static uint64_t multiswap_enc(const uint32_t keys[12], uint64_t key, uint64_t da
* @param data data to decrypt
* @return decrypted data
*/
-static uint64_t multiswap_dec(const uint32_t keys[12], uint64_t key, uint64_t data) {
+static uint64_t multiswap_dec(const uint32_t keys[12],
+ uint64_t key, uint64_t data)
+{
uint32_t a;
uint32_t b;
- uint32_t c = data >> 32;
+ uint32_t c = data >> 32;
uint32_t tmp = data;
- c -= tmp;
- b = multiswap_inv_step(keys + 6, tmp);
+ c -= tmp;
+ b = multiswap_inv_step(keys + 6, tmp);
tmp = c - (key >> 32);
- b -= tmp;
- a = multiswap_inv_step(keys , tmp);
- a -= key;
+ b -= tmp;
+ a = multiswap_inv_step(keys, tmp);
+ a -= key;
return ((uint64_t)b << 32) | a;
}
-void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len) {
+void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len)
+{
struct AVDES des;
struct AVRC4 rc4;
- int num_qwords = len >> 3;
- uint8_t *qwords = data;
+ int num_qwords = len >> 3;
+ uint8_t *qwords = data;
uint64_t rc4buff[8] = { 0 };
uint64_t packetkey;
uint32_t ms_keys[12];
@@ -155,7 +165,7 @@ void ff_asfcrypt_dec(const uint8_t key[20], uint8_t *data, int len) {
av_rc4_crypt(&rc4, (uint8_t *)rc4buff, NULL, sizeof(rc4buff), NULL, 1);
multiswap_init((uint8_t *)rc4buff, ms_keys);
- packetkey = AV_RN64(&qwords[num_qwords*8 - 8]);
+ packetkey = AV_RN64(&qwords[num_qwords * 8 - 8]);
packetkey ^= rc4buff[7];
av_des_init(&des, key + 12, 64, 1);
av_des_crypt(&des, (uint8_t *)&packetkey, (uint8_t *)&packetkey, 1, NULL, 1);