cSystemCryptoworks Class Reference

Inheritance diagram for cSystemCryptoworks:

List of all members.

Public Member Functions
	cSystemCryptoworks (void)
virtual bool	ProcessECM (const cEcmInfo *ecmInfo, unsigned char *data)

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Detailed Description

Definition at line 409 of file cryptoworks.c.

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Constructor & Destructor Documentation

cSystemCryptoworks::cSystemCryptoworks

(

void

)

Definition at line 417 of file cryptoworks.c.

:cSystem(SYSTEM_NAME,SYSTEM_PRI)
{
//  hasLogger=true;
}

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Member Function Documentation

bool cSystemCryptoworks::ProcessECM	(	const cEcmInfo *	ecmInfo,
		unsigned char *	data
	)		[virtual]

Implements cSystem.

Definition at line 423 of file cryptoworks.c.

References cEcmInfo::caId, CCID, CCTYP, cSystem::cw, cCryptoworks::DecryptDES(), cCryptoworks::DecryptRSA(), cSystem::doLog, DUMPNANO, ECM_ALGO_TYP, ECM_DATA_START, ECM_NANO_LEN, ECM_NANO_START, cPlainKeys::FindKey(), cPlainKey::Get(), i, j, keys, KEYSET, L_SYS_ECM, L_SYS_KEY, L_SYS_VERBOSE, LDUMP, mod, cKeySnoop::OK(), PRINTF, prov, SCT_LEN, and cCryptoworks::Signature().

{
  int len=SCT_LEN(data);
  if(data[ECM_NANO_LEN]!=len-ECM_NANO_START) {
    PRINTF(L_SYS_ECM,"invalid ECM structure");
    return false;
    }

  int prov=-1, keyid=0;
  for(int i=ECM_NANO_START; i<len; i+=data[i+1]+2) {
    if(data[i]==0x83) {
      prov =data[i+2]&0xFC;
      keyid=data[i+2]&0x03;
      break;
      }
    }
  if(prov<0) {
    PRINTF(L_SYS_ECM,"provider ID not located in ECM");
    return false;
    }

  unsigned char key[22];
  cPlainKey *pk;
  if(!(pk=keys.FindKey('W',ecmInfo->caId,KEYSET(prov,CCTYP,CCID),6))) {
    if(doLog) PRINTF(L_SYS_KEY,"missing %04X %02X CC key",ecmInfo->caId,prov);
    return false;
    }
  pk->Get(key+16);

  // RSA stage
  DUMPNANO("pre-RSA",&data[ECM_NANO_START],len-ECM_NANO_START);
  for(int i=ECM_NANO_START; i<len; i+=data[i+1]+2) {
    int l=data[i+1]+2;
    switch(data[i]) {
      case 0x85:
        {
        if(!(pk=keys.FindKey('W',ecmInfo->caId,KEYSET(prov,0x31,keyid),16))) {
          if(doLog) PRINTF(L_SYS_KEY,"missing %04X %02X 31 %02X key",ecmInfo->caId,prov,keyid);
          return false;
          }
        pk->Get(key);
        cBN mod;
        if(!(pk=keys.FindKey('W',ecmInfo->caId,KEYSET(prov,0x10,0x00),64))) {
          if(doLog) PRINTF(L_SYS_KEY,"missing %04X %02X 10 00 key",ecmInfo->caId,prov);
          return false;
          }
        pk->Get(mod);

        l-=10;
        if(!DecryptRSA(&data[i+2],l,data[ECM_ALGO_TYP],key,mod))
          return false;
        memmove(&data[i],&data[i+2],l);
        memmove(&data[i+l],&data[i+l+10],len-i-l);
        len-=10;
        break;
        }
      case 0x86:
        memmove(&data[i],&data[i+l],len-i-l);
        len-=l;
        continue;
      }
    }
  DUMPNANO("post-RSA",&data[ECM_NANO_START],len-ECM_NANO_START);

  cKeySnoop ks(this,'W',ecmInfo->caId,KEYSET(prov,0x20,keyid));
  if(!(pk=keys.FindKey('W',ecmInfo->caId,KEYSET(prov,0x20,keyid),16))) {
    if(doLog) PRINTF(L_SYS_KEY,"missing %04X %02X 20 %02X key",ecmInfo->caId,prov,keyid);
    return false;
    }
  pk->Get(key);

  // DES stage
  unsigned char sig[8];
  LDUMP(L_SYS_VERBOSE,&data[len-8],8,"sig org:");
  data[ECM_NANO_LEN]=len-ECM_NANO_START;
  Signature(&data[ECM_DATA_START],len-ECM_DATA_START-10,key,sig);
  for(int i=ECM_NANO_START; i<len; i+=data[i+1]+2) {
    switch(data[i]) {
      case 0xDA:
      case 0xDB:
      case 0xDC:
        for(int j=0; j<data[i+1]; j+=8)
          DecryptDES(&data[i+2+j],data[ECM_ALGO_TYP],key);
        break;
      case 0xDF:
        if(memcmp(&data[i+2],sig,8)) {
          PRINTF(L_SYS_ECM,"signature failed in ECM");
          return false;
          }
        break;
      }
    }
  
  // CW stage
  for(int i=ECM_NANO_START; i<len; i+=data[i+1]+2) {
    switch(data[i]) {
      case 0xDB:
        if(data[i+1]==0x10) {
          memcpy(cw,&data[i+2],16);
          LDUMP(L_SYS_VERBOSE,cw,16,"cw:");
          ks.OK(pk);
          return true;
          }
        break;
      }
    }

  return false;
}

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The documentation for this class was generated from the following file:

• sc/PLUGINS/src/sc-src/systems/cryptoworks/cryptoworks.c