cIrdeto2 Class Reference

Inheritance diagram for cIrdeto2:

List of all members.

Protected Member Functions
void	Encrypt (unsigned char *data, const unsigned char *seed, const unsigned char *key, int len)
void	Decrypt (unsigned char *data, const unsigned char *seed, const unsigned char *key, int len)
bool	CalculateHash (const unsigned char *key, const unsigned char *iv, const unsigned char *data, int len)

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Detailed Description

Definition at line 37 of file irdeto2.c.

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Member Function Documentation

bool cIrdeto2::CalculateHash	(	const unsigned char *	key,
		const unsigned char *	iv,
		const unsigned char *	data,
		int	len
	)		[protected]

Definition at line 90 of file irdeto2.c.

References L_SYS_VERBOSE, LDUMP, and xxor.

Referenced by cSystemIrd2::ProcessECM(), and cSystemIrd2::ProcessEMM().

{
  ScheduleKey(key);
  unsigned char cbuff[8];
  memset(cbuff,0,sizeof(cbuff));
  len-=8;
  for(int y=0; y<len; y+=8) {
    if(y<len-8) {
      xxor(cbuff,8,cbuff,&data[y]);
      LDUMP(L_SYS_VERBOSE,cbuff,8,"3DES XOR in:");
      }
    else {
      int l=len-y;
      xxor(cbuff,l,cbuff,&data[y]);
      xxor(cbuff+l,8-l,cbuff+l,iv+8);
      LDUMP(L_SYS_VERBOSE,cbuff,8,"3DES XOR(%d) in:",8-l);
      }
    DES3(cbuff,0);
    LDUMP(L_SYS_VERBOSE,cbuff,8,"3DES out:");
    }
  LDUMP(L_SYS_VERBOSE,cbuff,8,"CryptBuffer:");
  LDUMP(L_SYS_VERBOSE,&data[len],8,"MACBuffer:");
  return memcmp(cbuff,&data[len],8)==0;
}

void cIrdeto2::Decrypt	(	unsigned char *	data,
		const unsigned char *	seed,
		const unsigned char *	key,
		int	len
	)		[protected]

Definition at line 76 of file irdeto2.c.

References i, and xxor.

Referenced by cSystemIrd2::ProcessECM(), and cSystemIrd2::ProcessEMM().

{
  ScheduleKey(key);
  len&=~7;
  unsigned char buf[2][8];
  int n=0;
  memcpy(buf[n],seed,8);
  for(int i=0; i<len; i+=8,data+=8,n^=1) {
    memcpy(buf[1-n],data,8);
    DES3(data,1);
    xxor(data,8,data,buf[n]);
    }
}

void cIrdeto2::Encrypt	(	unsigned char *	data,
		const unsigned char *	seed,
		const unsigned char *	key,
		int	len
	)		[protected]

Definition at line 65 of file irdeto2.c.

References i, and xxor.

{
  ScheduleKey(key);
  len&=~7;
  const unsigned char *tmp=seed;
  for(int i=0; i<len; i+=8) {
    xxor(&data[i],8,&data[i],tmp); tmp=&data[i];
    DES3(&data[i],0);
    }
}

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

• sc/PLUGINS/src/sc-src/systems/irdeto/irdeto2.c