cIrdeto Class Reference

Inheritance diagram for cIrdeto:

List of all members.

Protected Member Functions
void	SessionKeyCrypt (unsigned char *data, const unsigned char *key, int date)
bool	SignatureCheck (const unsigned char *data, int length, const unsigned char *key, int date, const unsigned char *signature, int keylen)
void	DecryptIrd (unsigned char *data, unsigned char *key, int rounds, int offset)

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Detailed Description

Definition at line 93 of file irdeto1.c.

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Member Function Documentation

void cIrdeto::DecryptIrd	(	unsigned char *	data,
		unsigned char *	key,
		int	rounds,
		int	offset
	)		[protected]

Definition at line 172 of file irdeto1.c.

References count, and k.

Referenced by cSystemIrd::ProcessEMM(), SessionKeyCrypt(), and SignatureCheck().

{
  for(int count=0; count<rounds; count++) {
    int index=count % 10;
    if(index==0) Rotate(key);
    unsigned char k=key[index];
    unsigned char d=data[T0[(count & 0x0f) + offset]] ^ k;
    d=(k&1) ? T1[d] : T2[d];
    data[T0[((count+1) & 0x0f) + offset]] ^= d;
    }
}

void cIrdeto::SessionKeyCrypt	(	unsigned char *	data,
		const unsigned char *	key,
		int	date
	)		[protected]

Definition at line 184 of file irdeto1.c.

References DecryptIrd().

Referenced by cSystemIrd::ProcessECM(), and cSystemIrd::ProcessEMM().

{
  MakeTempKey(key,date);
  DecryptIrd(data,tempKey,128,16);
}

bool cIrdeto::SignatureCheck	(	const unsigned char *	data,
		int	length,
		const unsigned char *	key,
		int	date,
		const unsigned char *	signature,
		int	keylen
	)		[protected]

Definition at line 190 of file irdeto1.c.

References DecryptIrd(), i, and j.

Referenced by cSystemIrd::ProcessECM(), and cSystemIrd::ProcessEMM().

{
  unsigned char buffer[256];
  memcpy(buffer,data,length);
  int rounds;
  if((length%8)==0) rounds=40;
  else {
    int i=0x61;
    while((length%8)!=0) buffer[length++]=i++;
    rounds=104;
    }

  if(keylen==10) memcpy(tempKey,key,10);
  else MakeTempKey(key,date);

  int i=0;
  while(i<length-8) {
    DecryptIrd(buffer,tempKey,40,0);
    i+=8;
    for(int j=0; j<8; j++) buffer[j] ^= buffer[i+j];
    Rotate(tempKey);
    }
  DecryptIrd(buffer,tempKey,rounds,0);
  return memcmp(buffer,signature,5)==0;
}

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

• sc/PLUGINS/src/sc-src/systems/irdeto/irdeto1.c