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Correct indentation

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spdfrk1 2014-08-05 22:20:46 +02:00 • committed by Jaroslav Kysela
parent 5a731a4783
commit 3340ad20a8
1 changed files with 56 additions and 58 deletions
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114
src/descrambler/libaesdec/libaesdec.c
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@ -16,91 +16,89 @@
//-----key structure
struct aes_keys_t {
AES_KEY even;
AES_KEY odd;
AES_KEY even;
AES_KEY odd;
};
//-----even cw represents one full 128-bit AES key
void aes_set_even_control_word(void *keys, const unsigned char *pk) {
AES_set_decrypt_key(pk, 128, &((struct aes_keys_t *) keys)->even);
AES_set_decrypt_key(pk, 128, &((struct aes_keys_t *) keys)->even);
}
//-----odd cw represents one full 128-bit AES key
void aes_set_odd_control_word(void *keys, const unsigned char *pk) {
AES_set_decrypt_key(pk, 128, &((struct aes_keys_t *) keys)->odd);
AES_set_decrypt_key(pk, 128, &((struct aes_keys_t *) keys)->odd);
}
//-----set control words
void aes_set_control_words(void *keys, const unsigned char *ev,
const unsigned char *od) {
AES_set_decrypt_key(ev, 128, &((struct aes_keys_t *) keys)->even);
AES_set_decrypt_key(od, 128, &((struct aes_keys_t *) keys)->odd);
AES_set_decrypt_key(ev, 128, &((struct aes_keys_t *) keys)->even);
AES_set_decrypt_key(od, 128, &((struct aes_keys_t *) keys)->odd);
}
//-----allocate key structure
void * aes_get_key_struct(void) {
struct aes_keys_t *keys = (struct aes_keys_t *) malloc(
struct aes_keys_t *keys = (struct aes_keys_t *) malloc(
sizeof(struct aes_keys_t));
if (keys) {
static const unsigned char pk[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
aes_set_control_words(keys, pk, pk);
}
return keys;
if (keys) {
static const unsigned char pk[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
aes_set_control_words(keys, pk, pk);
}
return keys;
}
//-----free key structure
void aes_free_key_struct(void *keys) {
if (keys)
free(keys);
if (keys)
free(keys);
}
//----- decrypt
void aes_decrypt_packet(void *keys, unsigned char *packet) {
unsigned char *pkt;
unsigned char ev_od = 0;
int xc0, offset, n;
int len;
pkt = packet;
AES_KEY k;
unsigned char *pkt;
unsigned char ev_od = 0;
int xc0, offset, n;
int len;
pkt = packet;
AES_KEY k;
xc0 = pkt[3] & 0xc0;
//skip clear pkt
if (xc0 == 0x00) {
return;
}
//skip reserved pkt
if (xc0 == 0x40) {
return;
}
if (xc0 == 0x80 || xc0 == 0xc0) { // encrypted
ev_od = (xc0 & 0x40) >> 6; // 0 even, 1 odd
pkt[3] &= 0x3f; // consider it decrypted now
if (pkt[3] & 0x20) { // incomplete packet
offset = 4 + pkt[4] + 1;
len = 188 - offset;
n = len >> 3;
if (n == 0) { // decrypted==encrypted!
return; // this doesn't need more processing
}
}
else {
len = 184;
offset = 4;
}
}
else {
return;
}
xc0 = pkt[3] & 0xc0;
//skip clear pkt
if (xc0 == 0x00) {
return;
}
//skip reserved pkt
if (xc0 == 0x40) {
return;
}
if (xc0 == 0x80 || xc0 == 0xc0) { // encrypted
ev_od = (xc0 & 0x40) >> 6; // 0 even, 1 odd
pkt[3] &= 0x3f; // consider it decrypted now
if (pkt[3] & 0x20) { // incomplete packet
offset = 4 + pkt[4] + 1;
len = 188 - offset;
n = len >> 3;
if (n == 0) { // decrypted==encrypted!
return; // this doesn't need more processing
}
} else {
len = 184;
offset = 4;
}
} else {
return;
}
if (ev_od == 0) {
k = ((struct aes_keys_t *) keys)->even;
} else {
k = ((struct aes_keys_t *) keys)->odd;
}
if (ev_od == 0) {
k = ((struct aes_keys_t *) keys)->even;
} else {
k = ((struct aes_keys_t *) keys)->odd;
}
// TODO room for improvement?
int i;
for (i = offset; i <= (len - 16); i += 16) {
AES_ecb_encrypt(pkt + i, pkt + i, &k, AES_DECRYPT);
}
// TODO room for improvement?
int i;
for (i = offset; i <= (len - 16); i += 16) {
AES_ecb_encrypt(pkt + i, pkt + i, &k, AES_DECRYPT);
}
}