/*•••••*••css_descramble.c•••••*•••••*••Released•under•the•version•2•of•the•GPL.•••••*•••••*••***********************•••••*•••••*••This•file•contains•functions•to•descramble•CSS•encrypted•DVD•conten
••••••••*/••••••••/*•••••*••Stilin•progress:••Remove•the•use•othbit_reverse[tablby•recodin•••••••••••••••••••••••••the•generatioof•LFSR1•Finiscombininthis•wit••••••••••••••
•••••••••••the•css•authenticatiocode••••••••*/••••••••#include•(stdio.h)••••#include•(string.h•••#includ"css-descramble.h"••••••••typedeunsigned•chabyte•••••••/•••••••••somtables
•usefodescrambling•sectors•and/odecrypting•title•key••••••••*/••••••••static•bytcsstab1[256]•••{•••••0x33,0x73,0x3b,0x26,0x63,0x23,0x6b,0x76,0x3e,0x7e,0x36,0x2b,0x6e,0x2e,0x66,0x7b••••0x
d3,0x93,0xdb,0x06,0x43,0x03,0x4b,0x96,0xde,0x9e,0xd6,0x0b,0x4e,0x0e,0x46,0x9b,•••••0x57,0x17,0x5f,0x82,0xc7,0x87,0xcf,0x12,0x5a,0x1a,0x52,0x8f,0xca,0x8a,0xc2,0x1f••••0xd9,0x99,0xd1,0x00,0x49,0x09,0x41
,0x90,0xd8,0x98,0xd0,0x01,0x48,0x08,0x40,0x91,•••••0x3d,0x7d,0x35,0x24,0x6d,0x2d,0x65,0x74,0x3c,0x7c,0x34,0x25,0x6c,0x2c,0x64,0x75••••0xdd,0x9d,0xd5,0x04,0x4d,0x0d,0x45,0x94,0xdc,0x9c,0xd4,0x05,0x4c,0
x0c,0x44,0x95,•••••0x59,0x19,0x51,0x80,0xc9,0x89,0xc1,0x10,0x58,0x18,0x50,0x81,0xc8,0x88,0xc0,0x11••••0xd7,0x97,0xdf,0x02,0x47,0x07,0x4f,0x92,0xda,0x9a,0xd2,0x0f,0x4a,0x0a,0x42,0x9f,•••••0x53,0x13,0x5
b,0x86,0xc3,0x83,0xcb,0x16,0x5e,0x1e,0x56,0x8b,0xce,0x8e,0xc6,0x1b••••0xb3,0xf3,0xbb,0xa6,0xe3,0xa3,0xeb,0xf6,0xbe,0xfe,0xb6,0xab,0xee,0xae,0xe6,0xfb,•••••0x37,0x77,0x3f,0x22,0x67,0x27,0x6f,0x72,0x3a,
0x7a,0x32,0x2f,0x6a,0x2a,0x62,0x7f••••0xb9,0xf9,0xb1,0xa0,0xe9,0xa9,0xe1,0xf0,0xb8,0xf8,0xb0,0xa1,0xe8,0xa8,0xe0,0xf1,•••••0x5d,0x1d,0x55,0x84,0xcd,0x8d,0xc5,0x14,0x5c,0x1c,0x54,0x85,0xcc,0x8c,0xc4,0x
15••••0xbd,0xfd,0xb5,0xa4,0xed,0xad,0xe5,0xf4,0xbc,0xfc,0xb4,0xa5,0xec,0xac,0xe4,0xf5,•••••0x39,0x79,0x31,0x20,0x69,0x29,0x61,0x70,0x38,0x78,0x30,0x21,0x68,0x28,0x60,0x71••••0xb7,0xf7,0xbf,0xa2,0xe7
,0xa7,0xef,0xf2,0xba,0xfa,0xb2,0xaf,0xea,0xaa,0xe2,0xf•••}•••••••statibyte•lfsr1_bits0[256]=••••••••0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x09,0x08,0x0b,0x0a,0x0d,0x0c,0x0f,0x0e,•••••0x12,0x13
,0x10,0x11,0x16,0x17,0x14,0x15,0x1b,0x1a,0x19,0x18,0x1f,0x1e,0x1d,0x1c••••0x24,0x25,0x26,0x27,0x20,0x21,0x22,0x23,0x2d,0x2c,0x2f,0x2e,0x29,0x28,0x2b,0x2a,•••••0x36,0x37,0x34,0x35,0x32,0x33,0x30,0x31,0
x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38••••0x49,0x48,0x4b,0x4a,0x4d,0x4c,0x4f,0x4e,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,•••••0x5b,0x5a,0x59,0x58,0x5f,0x5e,0x5d,0x5c,0x52,0x53,0x50,0x51,0x56,0x57,0x5
4,0x55••••0x6d,0x6c,0x6f,0x6e,0x69,0x68,0x6b,0x6a,0x64,0x65,0x66,0x67,0x60,0x61,0x62,0x63,•••••0x7f,0x7e,0x7d,0x7c,0x7b,0x7a,0x79,0x78,0x76,0x77,0x74,0x75,0x72,0x73,0x70,0x71••••0x92,0x93,0x90,0x91,
0x96,0x97,0x94,0x95,0x9b,0x9a,0x99,0x98,0x9f,0x9e,0x9d,0x9c,•••••0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x89,0x88,0x8b,0x8a,0x8d,0x8c,0x8f,0x8e••••0xb6,0xb7,0xb4,0xb5,0xb2,0xb3,0xb0,0xb1,0xbf,0xbe,0x
bd,0xbc,0xbb,0xba,0xb9,0xb8,•••••0xa4,0xa5,0xa6,0xa7,0xa0,0xa1,0xa2,0xa3,0xad,0xac,0xaf,0xae,0xa9,0xa8,0xab,0xaa••••0xdb,0xda,0xd9,0xd8,0xdf,0xde,0xdd,0xdc,0xd2,0xd3,0xd0,0xd1,0xd6,0xd7,0xd4,0xd5,••••
•0xc9,0xc8,0xcb,0xca,0xcd,0xcc,0xcf,0xce,0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7••••0xff,0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf6,0xf7,0xf4,0xf5,0xf2,0xf3,0xf0,0xf1,•••••0xed,0xec,0xef,0xee,0xe9,0xe8,0
xeb,0xea,0xe4,0xe5,0xe6,0xe7,0xe0,0xe1,0xe2,0xe3••••};••••••••static•bytlfsr1_bits1[512]•••{•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0
x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x2
4,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0x
b6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d
,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0
x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xf
f,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,
0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x
6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24
,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff
••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb
6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,
0x92,0xb6,0xdb,0xff,•••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff••••0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xf•••}••••••
•/Reversthordeof•the•bitwithin•a•byte.•••••*•••statibyte•bit_reverse[256]=••••••••0x00,0x80,0x40,0xc0,0x20,0xa0,0x60,0xe0,0x10,0x90,0x50,0xd0,0x30,0xb0,0x70,0xf0,•••••0x08,0x88,0x48,0xc8
,0x28,0xa8,0x68,0xe8,0x18,0x98,0x58,0xd8,0x38,0xb8,0x78,0xf8••••0x04,0x84,0x44,0xc4,0x24,0xa4,0x64,0xe4,0x14,0x94,0x54,0xd4,0x34,0xb4,0x74,0xf4,•••••0x0c,0x8c,0x4c,0xcc,0x2c,0xac,0x6c,0xec,0x1c,0x9c,0
x5c,0xdc,0x3c,0xbc,0x7c,0xfc••••0x02,0x82,0x42,0xc2,0x22,0xa2,0x62,0xe2,0x12,0x92,0x52,0xd2,0x32,0xb2,0x72,0xf2,•••••0x0a,0x8a,0x4a,0xca,0x2a,0xaa,0x6a,0xea,0x1a,0x9a,0x5a,0xda,0x3a,0xba,0x7a,0xfa••
••0x06,0x86,0x46,0xc6,0x26,0xa6,0x66,0xe6,0x16,0x96,0x56,0xd6,0x36,0xb6,0x76,0xf6,•••••0x0e,0x8e,0x4e,0xce,0x2e,0xae,0x6e,0xee,0x1e,0x9e,0x5e,0xde,0x3e,0xbe,0x7e,0xfe••••0x01,0x81,0x41,0xc1,0x21,0xa1,
0x61,0xe1,0x11,0x91,0x51,0xd1,0x31,0xb1,0x71,0xf1,•••••0x09,0x89,0x49,0xc9,0x29,0xa9,0x69,0xe9,0x19,0x99,0x59,0xd9,0x39,0xb9,0x79,0xf9••••0x05,0x85,0x45,0xc5,0x25,0xa5,0x65,0xe5,0x15,0x95,0x55,0xd5,0x
35,0xb5,0x75,0xf5,•••••0x0d,0x8d,0x4d,0xcd,0x2d,0xad,0x6d,0xed,0x1d,0x9d,0x5d,0xdd,0x3d,0xbd,0x7d,0xfd••••0x03,0x83,0x43,0xc3,0x23,0xa3,0x63,0xe3,0x13,0x93,0x53,0xd3,0x33,0xb3,0x73,0xf3,•••••0x0b,0x8b
,0x4b,0xcb,0x2b,0xab,0x6b,0xeb,0x1b,0x9b,0x5b,0xdb,0x3b,0xbb,0x7b,0xfb••••0x07,0x87,0x47,0xc7,0x27,0xa7,0x67,0xe7,0x17,0x97,0x57,0xd7,0x37,0xb7,0x77,0xf7,•••••0x0f,0x8f,0x4f,0xcf,0x2f,0xaf,0x6f,0xef,0
x1f,0x9f,0x5f,0xdf,0x3f,0xbf,0x7f,0xff••••};••••••••/*•••••*•••••*•thifunction•ionly•useinternally•whedecrypting•title•key•••••*•••••*•••stativoid•css_titlekey(byte•*key,•byt*im,•bytinve
rt•••{•••••unsigneinlfsr1_lo,lfsr1_hi,lfsr0,combined••••byte•o_lfsr0o_lfsr1;•••••bytk[5]••••ini;•••••••••lfsr1_lim[00x100;•••••lfsr1_him[1];•••••••••lfsr0•=•((im[4]•(17
(im[3]•(9)•|•(im[2((•1))•+•8•-•(im[2]&7)••••lfsr(bit_reverse[lfsr0&0xff]((24(bit_reverse[(lfsr0))8)&0xff((•16)••••••••(bit_reverse[(lfsr0))16)&0xff]((8)•|•bit_reverse[(lfsr0))24)&0xff]
••••••••combined•=•0••••fo(i•=•05;•++i•••••o_lfsr1••lfsr1_bits0[lfsr1_hilfsr1_bits1[lfsr1_lo];••••••••lfsr1_hi•=•lfsr1_lo))1•••••••lfsr1_l((lfsr1_lo&1)((8o_lfsr1;••••••o_
lfsr•=•bit_reverse[o_lfsr1];••••••••••/*o_lfsr(lfsr0))7)^(lfsr0))10)^(lfsr0))11)^(lfsr0))19);*•••••o_lfsr0•=•(((((((lfsr0))8)^lfsr0)))1)^lfsr0)))3)^lfsr0)))7)•••••••lfsr0•=•(lfsr0))8)|(o_lfsr0
((24);••••••••••combined•+(o_lfsr0•^•invert)•+•o_lfsr1•••••k[icombined•&•0xff;••••••combined•))=•8••••••••••••key[4]=k[4]^csstab1[key[4]]^key[3]••••key[3]=k[3]^csstab1[key[3]]^key[2]••••
key[2]=k[2]^csstab1[key[2]]^key[1]••••key[1]=k[1]^csstab1[key[1]]^key[0]••••key[0]=k[0]^csstab1[key[0]]^key[4]••••••••key[4]=k[4]^csstab1[key[4]]^key[3]••••key[3]=k[3]^csstab1[key[3]]^key[2]••
••key[2]=k[2]^csstab1[key[2]]^key[1]••••key[1]=k[1]^csstab1[key[1]]^key[0]••••key[0]=k[0]^csstab1[key[0]];•••••••••••/••••••••this•functiodecrypts•a•title•key•witthspecifiedisk•key••
•••*•••••*•tkey:•the•unobfuscatetitlke(XORed•witBusKey••••dkeythunobfuscated•diske(XORed•witBusKey••••••••••2048•bytes•ilength•(though•onlbytearneededsebelow)••••
•*•pkey:•array•opointers•tplayer•keyandisk•key•offsets•••••*•••••*•••••*•use•the•resulreturned•itkey•witcss_descramble•••••*•••••*•••••••int•css_decrypttitlekey(byt*tkey,•byt*dkey,•s
trucplayke**pkey•••{•••••byttest[5],•pretkey[5];•••••int•i•=•0••••••••fo(;•*pkey++pkey++i)•{••••••memcpy(pretkeydkey•+•(*pkey)-)offset5)•••••css_titlekey(pretkey,•(*pkey)-)key,•0);
••••••••••memcpy(test,•dkey,•5);••••••css_titlekey(test,•pretkey0)•••••••••i(memcmp(testpretkey,•5==•0••••••fprintf(stderr"Using•Key•%d\n"i+1)••••••break;••••••••••••••••••if•(!*
pkey•••••fprintf(stderr,•"Shit•-•NeeKe%d\n",•i+1);••••••return•0••••••••••••css_titlekey(tkey,•pretkey0xff);•••••••••retur1;•••••••••••/••••••••this•functiodoes•the•actuadesc
rambling•••••*•••••*•secencryptesector•(2048•bytes••••key:•decrypted•title•key•obtainefrom•css_decrypttitlekey•••••*•••••*•••voicss_descramble(byt*sec,byt*key•••{•••••unsigneinlf
sr1_lo,lfsr1_hi,lfsr0,combined••••unsigned•chao_lfsr0,•o_lfsr1••••unsigned•cha*end•=•sec•+•0x800•••#define•SALTED(i)•(key[i]•^•sec[0x5(i)]••••••••lfsr1_lo•=•SALTED(0)•|•0x100••••lfsr1_
hi•=•SALTED(1)••••••••lfsr((SALTED(4((•17)•|•(SALTED(3((•9(SALTED(2)•(1)(SALTED(2)&7);•••••lfsr0•=•(bit_reverse[lfsr0&0xff]((24)•|•(bit_reverse[(lfsr0))8)&0xff]•(16•••••••|•(
bit_reverse[(lfsr0))16)&0xff]((8bit_reverse[(lfsr0))24)&0xff];•••••••••sec+=0x80••••combined•=•0••••whil(sec•!end)•{••••••o_lfsr•=•lfsr1_bits0[lfsr1_hi]•^•lfsr1_bits1[lfsr1_lo]•••••••lfs
r1_hlfsr1_lo))1;••••••••lfsr1_lo•=•((lfsr1_lo&1)((8)•^•o_lfsr1•••••o_lfsr1••bit_reverse[o_lfsr1]•••••••••/*o_lfsr0•=•(lfsr0))7)^(lfsr0))10)^(lfsr0))11)^(lfsr0))19);*/••••••o_lfsr(((((((lfs
r0))8)^lfsr0)))1)^lfsr0)))3)^lfsr0)))7);••••••••lfsr(lfsr0))8)|(o_lfsr0((24)•••••••••combine+=•o_lfsr0•+•(byte)~o_lfsr1;••••••*sec++•=•csstab1[*sec]•^•(combined&0xff)•••••combine))8;•••••}
••••}/##############################################################################################################################################################################################*/