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SASC-NG
DVBSoftCAM
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SASC-NG
DVBSoftCAM
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Go to the source code of this file.
Functions | |
| int | get_internal_parallelism (void) |
| int | get_suggested_cluster_size (void) |
| void * | get_key_struct (void) |
| void | free_key_struct (void *keys) |
| void | set_control_words (void *keys, const unsigned char *even, const unsigned char *odd) |
| void | set_even_control_word (void *keys, const unsigned char *even) |
| void | set_odd_control_word (void *keys, const unsigned char *odd) |
| int | decrypt_packets (void *keys, unsigned char **cluster) |
| int decrypt_packets | ( | void * | keys, |
| unsigned char ** | cluster | ||
| ) |
Definition at line 562 of file FFdecsa.c.
References block_decypher_group(), cluster, COPY_8_BY, DBG, FFTABLEIN(), FFTABLEOUT(), FFTABLEOUTXORNBY(), g_swap, GROUP_PARALLELISM, i, csa_key_t::iA_g, csa_key_t::iB_g, j, k, csa_key_t::kkmulti, M_EMPTY, MEMALIGN, NULL, XOR_8_BY, XOREQ_4_BY, and XOREQ_8_BY.
Referenced by cDeCSA::Decrypt(), main(), and process_ts().
{
// statistics, currently unused
int stat_no_scramble=0;
int stat_reserved=0;
int stat_decrypted[2]={0,0};
int stat_decrypted_mini=0;
unsigned char **clst;
unsigned char **clst2;
int grouped;
int group_ev_od;
int advanced;
int can_advance;
unsigned char *g_pkt[GROUP_PARALLELISM];
int g_len[GROUP_PARALLELISM];
int g_offset[GROUP_PARALLELISM];
int g_n[GROUP_PARALLELISM];
int g_residue[GROUP_PARALLELISM];
unsigned char *pkt;
int xc0,ev_od,len,offset,n,residue;
struct csa_key_t* k;
int i,j,iter,g;
int t23,tsmall;
int alive[24];
//icc craziness int pad1=0; //////////align! FIXME
unsigned char *encp[GROUP_PARALLELISM];
MEMALIGN unsigned char stream_in[GROUP_PARALLELISM*8];
MEMALIGN unsigned char stream_out[GROUP_PARALLELISM*8];
MEMALIGN unsigned char ib[GROUP_PARALLELISM*8];
MEMALIGN unsigned char block_out[GROUP_PARALLELISM*8];
#ifdef COPY_UNALIGNED_PKT
unsigned char *unaligned[GROUP_PARALLELISM];
MEMALIGN unsigned char alignedBuff[GROUP_PARALLELISM][188];
#endif
struct stream_regs regs;
//icc craziness i=(int)&pad1;//////////align!!! FIXME
// build a list of packets to be processed
clst=cluster;
grouped=0;
advanced=0;
can_advance=1;
group_ev_od=-1; // silence incorrect compiler warning
pkt=*clst;
do{ // find a new packet
if(grouped==GROUP_PARALLELISM){
// full
break;
}
if(pkt==NULL){
// no more ranges
break;
}
if(pkt>=*(clst+1)){
// out of this range, try next
clst++;clst++;
pkt=*clst;
continue;
}
do{ // handle this packet
xc0=pkt[3]&0xc0;
DBG(fprintf(stderr," exam pkt=%p, xc0=%02x, can_adv=%i\n",pkt,xc0,can_advance));
if(xc0==0x00){
DBG(fprintf(stderr,"skip clear pkt %p (can_advance is %i)\n",pkt,can_advance));
advanced+=can_advance;
stat_no_scramble++;
break;
}
if(xc0==0x40){
DBG(fprintf(stderr,"skip reserved pkt %p (can_advance is %i)\n",pkt,can_advance));
advanced+=can_advance;
stat_reserved++;
break;
}
if(xc0==0x80||xc0==0xc0){ // encrypted
ev_od=(xc0&0x40)>>6; // 0 even, 1 odd
if(grouped==0) group_ev_od=ev_od; // this group will be all even (or odd)
if(group_ev_od==ev_od){ // could be added to group
pkt[3]&=0x3f; // consider it decrypted now
if(pkt[3]&0x20){ // incomplete packet
offset=4+pkt[4]+1;
len=188-offset;
n=len>>3;
residue=len-(n<<3);
if(n==0){ // decrypted==encrypted!
DBG(fprintf(stderr,"DECRYPTED MINI! (can_advance is %i)\n",can_advance));
advanced+=can_advance;
stat_decrypted_mini++;
break; // this doesn't need more processing
}
}else{
len=184;
offset=4;
n=23;
residue=0;
}
g_pkt[grouped]=pkt;
g_len[grouped]=len;
g_offset[grouped]=offset;
g_n[grouped]=n;
g_residue[grouped]=residue;
DBG(fprintf(stderr,"%2i: eo=%i pkt=%p len=%03i n=%2i residue=%i\n",grouped,ev_od,pkt,len,n,residue));
grouped++;
advanced+=can_advance;
stat_decrypted[ev_od]++;
}
else{
can_advance=0;
DBG(fprintf(stderr,"skip pkt %p and can_advance set to 0\n",pkt));
break; // skip and go on
}
}
} while(0);
if(can_advance){
// move range start forward
*clst+=188;
}
// next packet, if there is one
pkt+=188;
} while(1);
DBG(fprintf(stderr,"-- result: grouped %i pkts, advanced %i pkts\n",grouped,advanced));
// delete empty ranges and compact list
clst2=cluster;
for(clst=cluster;*clst!=NULL;clst+=2){
// if not empty
if(*clst<*(clst+1)){
// it will remain
*clst2=*clst;
*(clst2+1)=*(clst+1);
clst2+=2;
}
}
*clst2=NULL;
if(grouped==0){
// no processing needed
return advanced;
}
// sort them, longest payload first
// we expect many n=23 packets and a few n<23
DBG(fprintf(stderr,"PRESORTING\n"));
for(i=0;i<grouped;i++){
DBG(fprintf(stderr,"%2i of %2i: pkt=%p len=%03i n=%2i residue=%i\n",i,grouped,g_pkt[i],g_len[i],g_n[i],g_residue[i]));
}
// grouped is always <= GROUP_PARALLELISM
#define g_swap(a,b) \
pkt=g_pkt[a]; \
g_pkt[a]=g_pkt[b]; \
g_pkt[b]=pkt; \
\
len=g_len[a]; \
g_len[a]=g_len[b]; \
g_len[b]=len; \
\
offset=g_offset[a]; \
g_offset[a]=g_offset[b]; \
g_offset[b]=offset; \
\
n=g_n[a]; \
g_n[a]=g_n[b]; \
g_n[b]=n; \
\
residue=g_residue[a]; \
g_residue[a]=g_residue[b]; \
g_residue[b]=residue;
// step 1: move n=23 packets before small packets
t23=0;
tsmall=grouped-1;
for(;;){
for(;t23<grouped;t23++){
if(g_n[t23]!=23) break;
}
DBG(fprintf(stderr,"t23 after for =%i\n",t23));
for(;tsmall>=0;tsmall--){
if(g_n[tsmall]==23) break;
}
DBG(fprintf(stderr,"tsmall after for =%i\n",tsmall));
if(tsmall-t23<1) break;
DBG(fprintf(stderr,"swap t23=%i,tsmall=%i\n",t23,tsmall));
g_swap(t23,tsmall);
t23++;
tsmall--;
DBG(fprintf(stderr,"new t23=%i,tsmall=%i\n\n",t23,tsmall));
}
DBG(fprintf(stderr,"packets with n=23, t23=%i grouped=%i\n",t23,grouped));
DBG(fprintf(stderr,"MIDSORTING\n"));
for(i=0;i<grouped;i++){
DBG(fprintf(stderr,"%2i of %2i: pkt=%p len=%03i n=%2i residue=%i\n",i,grouped,g_pkt[i],g_len[i],g_n[i],g_residue[i]));
}
// step 2: sort small packets in decreasing order of n (bubble sort is enough)
for(i=t23;i<grouped;i++){
for(j=i+1;j<grouped;j++){
if(g_n[j]>g_n[i]){
g_swap(i,j);
}
}
}
DBG(fprintf(stderr,"POSTSORTING\n"));
for(i=0;i<grouped;i++){
DBG(fprintf(stderr,"%2i of %2i: pkt=%p len=%03i n=%2i residue=%i\n",i,grouped,g_pkt[i],g_len[i],g_n[i],g_residue[i]));
}
// we need to know how many packets need 23 iterations, how many 22...
for(i=0;i<=23;i++){
alive[i]=0;
}
// count
alive[23-1]=t23;
for(i=t23;i<grouped;i++){
alive[g_n[i]-1]++;
}
// integrate
for(i=22;i>=0;i--){
alive[i]+=alive[i+1];
}
DBG(fprintf(stderr,"ALIVE\n"));
for(i=0;i<=23;i++){
DBG(fprintf(stderr,"alive%2i=%i\n",i,alive[i]));
}
// choose key
if(group_ev_od==0){
k=&((struct csa_keys_t *)keys)->even;
}
else{
k=&((struct csa_keys_t *)keys)->odd;
}
//INIT
//#define INITIALIZE_UNUSED_INPUT
#ifdef INITIALIZE_UNUSED_INPUT
// unnecessary zeroing.
// without this, we operate on uninitialized memory
// when grouped<GROUP_PARALLELISM, but it's not a problem,
// as final results will be discarded.
// random data makes debugging sessions difficult.
for(j=0;j<GROUP_PARALLELISM*8;j++) stream_in[j]=0;
DBG(fprintf(stderr,"--- WARNING: you could gain speed by not initializing unused memory ---\n"));
#else
DBG(fprintf(stderr,"--- WARNING: DEBUGGING IS MORE DIFFICULT WHEN PROCESSING RANDOM DATA CHANGING AT EVERY RUN! ---\n"));
#endif
for(g=0;g<grouped;g++){
encp[g]=g_pkt[g];
DBG(fprintf(stderr,"header[%i]=%p (%02x)\n",g,encp[g],*(encp[g])));
encp[g]+=g_offset[g]; // skip header
#ifdef COPY_UNALIGNED_PKT
if(((int)encp[g])&0x03) {
memcpy(alignedBuff[g],encp[g],g_len[g]);
unaligned[g]=encp[g];
encp[g]=alignedBuff[g];
}
else unaligned[g]=0;
#endif
FFTABLEIN(stream_in,g,encp[g]);
}
//dump_mem("stream_in",stream_in,GROUP_PARALLELISM*8,BYPG);
// ITER 0
DBG(fprintf(stderr,">>>>>ITER 0\n"));
iter=0;
stream_cypher_group_init(®s,k->iA_g,k->iB_g,stream_in);
// fill first ib
for(g=0;g<alive[iter];g++){
COPY_8_BY(ib+8*g,encp[g]);
}
DBG(dump_mem("IB ",ib,8*alive[iter],8));
// ITER 1..N-1
for (iter=1;iter<23&&alive[iter-1]>0;iter++){
DBG(fprintf(stderr,">>>>>ITER %i\n",iter));
// alive and just dead packets: calc block
block_decypher_group(k->kkmulti,ib,block_out,alive[iter-1]);
DBG(dump_mem("BLO_ib ",block_out,8*alive[iter-1],8));
// all packets (dead too): calc stream
stream_cypher_group_normal(®s,stream_out);
//dump_mem("stream_out",stream_out,GROUP_PARALLELISM*8,BYPG);
// alive packets: calc ib
for(g=0;g<alive[iter];g++){
FFTABLEOUT(ib+8*g,stream_out,g);
DBG(dump_mem("stream_out_ib ",ib+8*g,8,8));
// XOREQ8BY gcc bug? 2x4 ok, 8 ko UPDATE: result ok but speed 1-2% slower (!!!???)
#if 1
XOREQ_4_BY(ib+8*g,encp[g]+8);
XOREQ_4_BY(ib+8*g+4,encp[g]+8+4);
#else
XOREQ_8_BY(ib+8*g,encp[g]+8);
#endif
DBG(dump_mem("after_stream_xor_ib ",ib+8*g,8,8));
}
// alive packets: decrypt data
for(g=0;g<alive[iter];g++){
DBG(dump_mem("before_ib_decrypt_data ",encp[g],8,8));
XOR_8_BY(encp[g],ib+8*g,block_out+8*g);
DBG(dump_mem("after_ib_decrypt_data ",encp[g],8,8));
}
// just dead packets: write decrypted data
for(g=alive[iter];g<alive[iter-1];g++){
DBG(dump_mem("jd_before_ib_decrypt_data ",encp[g],8,8));
COPY_8_BY(encp[g],block_out+8*g);
DBG(dump_mem("jd_after_ib_decrypt_data ",encp[g],8,8));
}
// just dead packets: decrypt residue
for(g=alive[iter];g<alive[iter-1];g++){
DBG(dump_mem("jd_before_decrypt_residue ",encp[g]+8,g_residue[g],g_residue[g]));
FFTABLEOUTXORNBY(g_residue[g],encp[g]+8,stream_out,g);
DBG(dump_mem("jd_after_decrypt_residue ",encp[g]+8,g_residue[g],g_residue[g]));
}
// alive packets: pointers++
for(g=0;g<alive[iter];g++) encp[g]+=8;
};
// ITER N
DBG(fprintf(stderr,">>>>>ITER 23\n"));
iter=23;
// calc block
block_decypher_group(k->kkmulti,ib,block_out,alive[iter-1]);
DBG(dump_mem("23BLO_ib ",block_out,8*alive[iter-1],8));
// just dead packets: write decrypted data
for(g=alive[iter];g<alive[iter-1];g++){
DBG(dump_mem("23jd_before_ib_decrypt_data ",encp[g],8,8));
COPY_8_BY(encp[g],block_out+8*g);
DBG(dump_mem("23jd_after_ib_decrypt_data ",encp[g],8,8));
}
// no residue possible
// so do nothing
DBG(fprintf(stderr,"returning advanced=%i\n",advanced));
#ifdef COPY_UNALIGNED_PKT
for(g=0;g<grouped;g++)
if(unaligned[g]) memcpy(unaligned[g],alignedBuff[g],g_len[g]);
#endif
M_EMPTY(); // restore CPU multimedia state
return advanced;
}
| void free_key_struct | ( | void * | keys | ) |
| int get_internal_parallelism | ( | void | ) |
Definition at line 482 of file FFdecsa.c.
References GROUP_PARALLELISM.
{
return GROUP_PARALLELISM;
}
| void* get_key_struct | ( | void | ) |
Definition at line 497 of file FFdecsa.c.
References keys, MALLOC, and set_control_words().
Referenced by connect_ffd(), and main().
{
struct csa_keys_t *keys=(struct csa_keys_t *)MALLOC(sizeof(struct csa_keys_t));
if(keys) {
static const unsigned char pk[8] = { 0,0,0,0,0,0,0,0 };
set_control_words(keys,pk,pk);
}
return keys;
}
| int get_suggested_cluster_size | ( | void | ) |
Definition at line 488 of file FFdecsa.c.
References GROUP_PARALLELISM.
Referenced by cDeCSA::cDeCSA(), and connect_ffd().
{
int r;
r=GROUP_PARALLELISM+GROUP_PARALLELISM/10;
if(r<GROUP_PARALLELISM+5) r=GROUP_PARALLELISM+5;
return r;
}
| void set_control_words | ( | void * | keys, |
| const unsigned char * | even, | ||
| const unsigned char * | odd | ||
| ) |
Definition at line 540 of file FFdecsa.c.
References csa_keys_t::even, csa_keys_t::odd, and schedule_key().
Referenced by get_key_struct(), and main().
{
schedule_key(&((struct csa_keys_t *)keys)->even,ev);
schedule_key(&((struct csa_keys_t *)keys)->odd,od);
}
| void set_even_control_word | ( | void * | keys, |
| const unsigned char * | even | ||
| ) |
Definition at line 545 of file FFdecsa.c.
References csa_keys_t::even, and schedule_key().
Referenced by process_ts(), and cDeCSA::SetDescr().
{
schedule_key(&((struct csa_keys_t *)keys)->even,pk);
}
| void set_odd_control_word | ( | void * | keys, |
| const unsigned char * | odd | ||
| ) |
Definition at line 549 of file FFdecsa.c.
References csa_keys_t::odd, and schedule_key().
Referenced by process_ts(), and cDeCSA::SetDescr().
{
schedule_key(&((struct csa_keys_t *)keys)->odd,pk);
}
1.7.3