irdeto.cpp

DVB-S的softcam源代码

/*
 * Softcam plugin to VDR (C++)
 *
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 */

#include "stdafx.h"

#include "common.h"
#include "system.h"
#include "system-common.h"
#include "data.h"
#include "parse.h"
#include "misc.h"

#define SYSTEM_IRDETO        0x0600
#define SYSTEM_BETA          0x1700

#define SYSTEM_NAME          "Irdeto"
#define SYSTEM_PRI           -10
#define SYSTEM_CAN_HANDLE(x) ((x)==SYSTEM_IRDETO || (x)==SYSTEM_BETA)

//#define DEBUG_IRD
//#define DEBUG_LOG

#ifdef DEBUG_IRD
#define di(x) { (x); }
#else
#define di(x) ;
#endif

#ifdef DEBUG_LOG
#define dl(x) { (x); }
#else
#define dl(x) ; 
#endif

static cPlainKeyTypeReg<cPlainKeyStd,'I',false> KeyReg;

// -- cIrdeto ------------------------------------------------------------------

class cIrdeto {
private:
	static const unsigned char T0[], T1[], T2[];
	unsigned char tempKey[10];
	//
	void Rotate(unsigned char *p);
	void MakeTempKey(const unsigned char *key, int date);
protected:
	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);
};

const unsigned char cIrdeto::T0[32] = {
  0,1,2,3,4,5,6,7, 0,1,2,3,4,5,6,7,
  0,1,2,3,4,5,6,7, 0,3,6,1,4,7,2,5
  };

const unsigned char cIrdeto::T1[256] = {
  0xDA,0x26,0xE8,0x72,0x11,0x52,0x3E,0x46, 0x32,0xFF,0x8C,0x1E,0xA7,0xBE,0x2C,0x29,
  0x5F,0x86,0x7E,0x75,0x0A,0x08,0xA5,0x21, 0x61,0xFB,0x7A,0x58,0x60,0xF7,0x81,0x4F,
  0xE4,0xFC,0xDF,0xB1,0xBB,0x6A,0x02,0xB3, 0x0B,0x6E,0x5D,0x5C,0xD5,0xCF,0xCA,0x2A,
  0x14,0xB7,0x90,0xF3,0xD9,0x37,0x3A,0x59, 0x44,0x69,0xC9,0x78,0x30,0x16,0x39,0x9A,
  0x0D,0x05,0x1F,0x8B,0x5E,0xEE,0x1B,0xC4, 0x76,0x43,0xBD,0xEB,0x42,0xEF,0xF9,0xD0,
  0x4D,0xE3,0xF4,0x57,0x56,0xA3,0x0F,0xA6, 0x50,0xFD,0xDE,0xD2,0x80,0x4C,0xD3,0xCB,
  0xF8,0x49,0x8F,0x22,0x71,0x84,0x33,0xE0, 0x47,0xC2,0x93,0xBC,0x7C,0x3B,0x9C,0x7D,
  0xEC,0xC3,0xF1,0x89,0xCE,0x98,0xA2,0xE1, 0xC1,0xF2,0x27,0x12,0x01,0xEA,0xE5,0x9B,
  0x25,0x87,0x96,0x7B,0x34,0x45,0xAD,0xD1, 0xB5,0xDB,0x83,0x55,0xB0,0x9E,0x19,0xD7,
  0x17,0xC6,0x35,0xD8,0xF0,0xAE,0xD4,0x2B, 0x1D,0xA0,0x99,0x8A,0x15,0x00,0xAF,0x2D,
  0x09,0xA8,0xF5,0x6C,0xA1,0x63,0x67,0x51, 0x3C,0xB2,0xC0,0xED,0x94,0x03,0x6F,0xBA,
  0x3F,0x4E,0x62,0x92,0x85,0xDD,0xAB,0xFE, 0x10,0x2E,0x68,0x65,0xE7,0x04,0xF6,0x0C,
  0x20,0x1C,0xA9,0x53,0x40,0x77,0x2F,0xA4, 0xFA,0x6D,0x73,0x28,0xE2,0xCD,0x79,0xC8,
  0x97,0x66,0x8E,0x82,0x74,0x06,0xC7,0x88, 0x1A,0x4A,0x6B,0xCC,0x41,0xE9,0x9D,0xB8,
  0x23,0x9F,0x3D,0xBF,0x8D,0x95,0xC5,0x13, 0xB9,0x24,0x5A,0xDC,0x64,0x18,0x38,0x91,
  0x7F,0x5B,0x70,0x54,0x07,0xB6,0x4B,0x0E, 0x36,0xAC,0x31,0xE6,0xD6,0x48,0xAA,0xB4
  };

const unsigned char cIrdeto::T2[256] = {
  0x8E,0xD5,0x32,0x53,0x4B,0x18,0x7F,0x95, 0xBE,0x30,0xF3,0xE0,0x22,0xE1,0x68,0x90,
  0x82,0xC8,0xA8,0x57,0x21,0xC5,0x38,0x73, 0x61,0x5D,0x5A,0xD6,0x60,0xB7,0x48,0x70,
  0x2B,0x7A,0x1D,0xD1,0xB1,0xEC,0x7C,0xAA, 0x2F,0x1F,0x37,0x58,0x72,0x88,0xFF,0x87,
  0x1C,0xCB,0x00,0xE6,0x4E,0xAB,0xEB,0xB3, 0xF7,0x59,0x71,0x6A,0x64,0x2A,0x55,0x4D,
  0xFC,0xC0,0x51,0x01,0x2D,0xC4,0x54,0xE2, 0x9F,0x26,0x16,0x27,0xF2,0x9C,0x86,0x11,
  0x05,0x29,0xA2,0x78,0x49,0xB2,0xA6,0xCA, 0x96,0xE5,0x33,0x3F,0x46,0xBA,0xD0,0xBB,
  0x5F,0x84,0x98,0xE4,0xF9,0x0A,0x62,0xEE, 0xF6,0xCF,0x94,0xF0,0xEA,0x1E,0xBF,0x07,
  0x9B,0xD9,0xE9,0x74,0xC6,0xA4,0xB9,0x56, 0x3E,0xDB,0xC7,0x15,0xE3,0x80,0xD7,0xED,
  0xEF,0x13,0xAC,0xA1,0x91,0xC2,0x89,0x5B, 0x08,0x0B,0x4C,0x02,0x3A,0x5C,0xA9,0x3B,
  0xCE,0x6B,0xA7,0xE7,0xCD,0x7B,0xA0,0x47, 0x09,0x6D,0xF8,0xF1,0x8B,0xB0,0x12,0x42,
  0x4A,0x9A,0x17,0xB4,0x7E,0xAD,0xFE,0xFD, 0x2C,0xD3,0xF4,0xB6,0xA3,0xFA,0xDF,0xB8,
  0xD4,0xDA,0x0F,0x50,0x93,0x66,0x6C,0x20, 0xD8,0x8A,0xDD,0x31,0x1A,0x8C,0x06,0xD2,
  0x44,0xE8,0x23,0x43,0x6E,0x10,0x69,0x36, 0xBC,0x19,0x8D,0x24,0x81,0x14,0x40,0xC9,
  0x6F,0x2E,0x45,0x52,0x41,0x92,0x34,0xFB, 0x5E,0x0D,0xF5,0x76,0x25,0x77,0x63,0x65,
  0xAF,0x4F,0xCC,0x03,0x9D,0x0C,0x28,0x39, 0x85,0xDE,0xB5,0x7D,0x67,0x83,0xBD,0xC3,
  0xDC,0x3C,0xAE,0x99,0x04,0x75,0x8F,0x97, 0xC1,0xA5,0x9E,0x35,0x0E,0x3D,0x1B,0x79
  };

void cIrdeto::Rotate(unsigned char *p)
{
	unsigned char c, t;
	c=p[9]<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
	t=*p; *p++=(t>>1) | c; c=t<<7;
}

void cIrdeto::MakeTempKey(const unsigned char *key, int date)
{
	memcpy(tempKey,key,8);
	tempKey[8]=(unsigned char)(date >> 8) ^ key[0];
	tempKey[9]=(unsigned char)date ^ key[1];
}

void cIrdeto::DecryptIrd(unsigned char *data, unsigned char *key, int rounds, int offset)
{
	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)
{
	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)
{
	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; 
}

// -- cSystemIrd ---------------------------------------------------------------

class cSystemIrd : public cSystem, private cIrdeto {
private:
	unsigned char lastKey;
public:
	cSystemIrd(void);
	virtual bool ProcessECM(const cEcmInfo *ecm, unsigned char *source);
};

cSystemIrd::cSystemIrd(void)
:cSystem(SYSTEM_NAME,SYSTEM_PRI)
{
	lastKey=0;
	hasLogger=true;
}

bool cSystemIrd::ProcessECM(const cEcmInfo *ecm, unsigned char *source)
{
	unsigned char *data=0;
	int date=-1, keynr=0;
	source+=6;
	int length=source[5]+6-5; // 6 header bytes - 5 signature bytes
	for(int index=6 ; index<length && (data==0 || date==-1) ;) {
		int param=source[index++];
		int len  =source[index++] & 0x3f;

		switch(param) {
			case 0x78:
				keynr = source[index];
				data = &source[index+2];
				break;
			case 0x00:
			case 0x40:
				date = (source[index]<<8) | source[index+1];
				break;
		}
		index+=len;
	}
	if(data==0 || date==-1) {
		di(printf("system-ird: incomplete ECM structure\n"))
		return false;
	}

	cKeySnoop ks(this,'I',source[2],keynr);
	cPlainKey *pk=0;
	unsigned char key[8];
	while((pk=keys.FindKey('I',source[2],keynr,sizeof(key),pk))) {
		unsigned char save[16];
		memcpy(save,data,16); // save the encrypted data
		pk->Get(key);
		SessionKeyCrypt(&data[0],key,date);
		SessionKeyCrypt(&data[8],key,date);
		if(SignatureCheck(source,length,key,date,&source[length],8)) {
			memcpy(cw,&data[0],16);
			ks.OK(pk);
			return true;
		}
		memcpy(data,save,16); // put back the encrypted data if it didn't works
	}
	return false;
}

// -- cSystemLinkIrd -----------------------------------------------------------

class cSystemLinkIrd : public cSystemLink {
public:
	cSystemLinkIrd(void);
	virtual bool CanHandle(unsigned short SysId);
	virtual cSystem *Create(void) { return new cSystemIrd; }
	virtual bool Init(const char *cfgdir);
};

static cSystemLinkIrd staticInit;

cSystemLinkIrd::cSystemLinkIrd(void)
:cSystemLink(SYSTEM_NAME,SYSTEM_PRI)
{
	Feature.NeedsKeyFile();
}

bool cSystemLinkIrd::CanHandle(unsigned short SysId)
{
	SysId&=SYSTEM_MASK;
	return SYSTEM_CAN_HANDLE(SysId);
}

bool cSystemLinkIrd::Init(const char *cfgdir)
{
	//Icards.Load(cfgdir,SYSTEM_NAME,"Ird-Beta.KID");
	return true;
}