SamyGO

Code: Select all

#define TS_FRAME_SIZE   188
static int process_section(
        uint8_t *data, uint8_t *outdata, uint8_t *drm_key)
{
	
	unsigned char iv[0x10];
	unsigned char *inbuf;
	unsigned char *outbuf;
	int rounds;
	int offset = 4;	

	memcpy(outdata, data, TS_FRAME_SIZE);

    int skipAF = 1;
	if((data[3] & 0xC0 ) == 0xC0)
	{
		//printf ("Odd Key...\n");
	}
	else if((data[3] & 0xC0) == 0x80)
	{
		//printf ("EvenKey...\n");
	}
	else if((data[3] & 0xC0) == 0x40)
	{
		//printf ("samsung encrypted adaption field...\n");
		skipAF = 0;
	}
	else
	{
		return 0;
	}
	
	if((data[3] & 0x20) && skipAF)
	    offset += data[4] + 1 ;      // skip adaption field
	outdata[3] &= 0x3f;                 // remove scrambling bits
	
	inbuf  = data + offset;
	outbuf = outdata + offset;
		
	rounds = (TS_FRAME_SIZE - offset) / 0x10;
	// AES CBC / ECB
	// CBC used at 2011 models
	// ECB used at 2010 models
	
	memset(iv, 0, 16);
	for (int i =  0; i <rounds; i++) {
		unsigned char *out = outbuf + i* 0x10;

		//for(n = 0; n < 16; n++) out[n] ^= iv[n];
		aes_decrypt_128(inbuf + i* 0x10, outbuf + i * 0x10, drm_key);
		//aes_encrypt_128(inbuf + i* 0x10, outbuf + i * 0x10, drm_key);
		//memcpy(iv, inbuf + i * 0x10, 16);
	}
	return 1;		
}