User: DeCSS-man

DeCSS

On: But Does it Run Linux?

/*
* css_unscramble.c : unscrambling function
* Copyright (C) 1999 Derek Fawcus
*
* This program 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 program 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, USA.
*/

unsigned int CSSt0[11] = { 5,0,1,2,3,4,0,1,2,3,4 };

unsigned char CSSt1[256]= {
0x33,0x73,0x3b,0x26,0x63,0x23,0x6b,0x76,0x3e,0x7 e, 0x36,0x2b,0x6e,0x2e,0x66,0x7b,
0xd3,0x93,0xdb,0x06,0x43,0x03,0x4b,0x96,0xde,0x9 e, 0xd6,0x0b,0x4e,0x0e,0x46,0x9b,
0x57,0x17,0x5f,0x82,0xc7,0x87,0xcf,0x12,0x5a,0x1 a, 0x52,0x8f,0xca,0x8a,0xc2,0x1f,
0xd9,0x99,0xd1,0x00,0x49,0x09,0x41,0x90,0xd8,0x9 8, 0xd0,0x01,0x48,0x08,0x40,0x91,
0x3d,0x7d,0x35,0x24,0x6d,0x2d,0x65,0x74,0x3c,0x7 c, 0x34,0x25,0x6c,0x2c,0x64,0x75,
0xdd,0x9d,0xd5,0x04,0x4d,0x0d,0x45,0x94,0xdc,0x9 c, 0xd4,0x05,0x4c,0x0c,0x44,0x95,
0x59,0x19,0x51,0x80,0xc9,0x89,0xc1,0x10,0x58,0x1 8, 0x50,0x81,0xc8,0x88,0xc0,0x11,
0xd7,0x97,0xdf,0x02,0x47,0x07,0x4f,0x92,0xda,0x9 a, 0xd2,0x0f,0x4a,0x0a,0x42,0x9f,
0x53,0x13,0x5b,0x86,0xc3,0x83,0xcb,0x16,0x5e,0x1 e, 0x56,0x8b,0xce,0x8e,0xc6,0x1b,
0xb3,0xf3,0xbb,0xa6,0xe3,0xa3,0xeb,0xf6,0xbe,0xf e, 0xb6,0xab,0xee,0xae,0xe6,0xfb,
0x37,0x77,0x3f,0x22,0x67,0x27,0x6f,0x72,0x3a,0x7 a, 0x32,0x2f,0x6a,0x2a,0x62,0x7f,
0xb9,0xf9,0xb1,0xa0,0xe9,0xa9,0xe1,0xf0,0xb8,0xf 8, 0xb0,0xa1,0xe8,0xa8,0xe0,0xf1,
0x5d,0x1d,0x55,0x84,0xcd,0x8d,0xc5,0x14,0x5c,0x1 c, 0x54,0x85,0xcc,0x8c,0xc4,0x15,
0xbd,0xfd,0xb5,0xa4,0xed,0xad,0xe5,0xf4,0xbc,0xf c, 0xb4,0xa5,0xec,0xac,0xe4,0xf5,
0x39,0x79,0x31,0x20,0x69,0x29,0x61,0x70,0x38,0x7 8, 0x30,0x21,0x68,0x28,0x60,0x71,
0xb7,0xf7,0xbf,0xa2,0xe7,0xa7,0xef,0xf2,0xba,0xf a, 0xb2,0xaf,0xea,0xaa,0xe2,0xff
};

unsigned char CSSt2[256]= {
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x09,0x0 8, 0x0b,0x0a,0x0d,0x0c,0x0f,0x0e,
0x12,0x13,0x10,0x11,0x16,0x17,0x14,0x15,0x1b,0x1 a, 0x19,0x18,0x1f,0x1e,0x1d,0x1c,
0x24,0x25,0x26,0x27,0x20,0x21,0x22,0x23,0x2d,0x2 c, 0x2f,0x2e,0x29,0x28,0x2b,0x2a,
0x36,0x37,0x34,0x35,0x32,0x33,0x30,0x31,0x3f,0x3 e, 0x3d,0x3c,0x3b,0x3a,0x39,0x38,
0x49,0x48,0x4b,0x4a,0x4d,0x4c,0x4f,0x4e,0x40,0x4 1, 0x42,0x43,0x44,0x45,0x46,0x47,
0x5b,0x5a,0x59,0x58,0x5f,0x5e,0x5d,0x5c,0x52,0x5 3, 0x50,0x51,0x56,0x57,0x54,0x55,
0x6d,0x6c,0x6f,0x6e,0x69,0x68,0x6b,0x6a,0x64,0x6 5, 0x66,0x67,0x60,0x61,0x62,0x63,
0x7f,0x7e,0x7d,0x7c,0x7b,0x7a,0x79,0x78,0x76,0x7 7, 0x74,0x75,0x72,0x73,0x70,0x71,
0x92,0x93,0x90,0x91,0x96,0x97,0x94,0x95,0x9b,0x9 a, 0x99,0x98,0x9f,0x9e,0x9d,0x9c,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x89,0x8 8, 0x8b,0x8a,0x8d,0x8c,0x8f,0x8e,
0xb6,0xb7,0xb4,0xb5,0xb2,0xb3,0xb0,0xb1,0xbf,0xb e, 0xbd,0xbc,0xbb,0xba,0xb9,0xb8,
0xa4,0xa5,0xa6,0xa7,0xa0,0xa1,0xa2,0xa3,0xad,0xa c, 0xaf,0xae,0xa9,0xa8,0xab,0xaa,
0xdb,0xda,0xd9,0xd8,0xdf,0xde,0xdd,0xdc,0xd2,0xd 3, 0xd0,0xd1,0xd6,0xd7,0xd4,0xd5,
0xc9,0xc8,0xcb,0xca,0xcd,0xcc,0xcf,0xce,0xc0,0xc 1, 0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,
0xff,0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf6,0xf 7, 0xf4,0xf5,0xf2,0xf3,0xf0,0xf1,
0xed,0xec,0xef,0xee,0xe9,0xe8,0xeb,0xea,0xe4,0xe 5, 0xe6,0xe7,0xe0,0xe1,0xe2,0xe3
};

unsigned char CSSt3[512]= {
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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 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,0x00,0x2 4, 0x49,0x6d,0x92,0xb6,0xdb,0xff
};

unsigned char CSSt4[256]= {
0x00,0x80,0x40,0xc0,0x20,0xa0,0x60,0xe0,0x10,0x9 0, 0x50,0xd0,0x30,0xb0,0x70,0xf0,
0x08,0x88,0x48,0xc8,0x28,0xa8,0x68,0xe8,0x18,0x9 8, 0x58,0xd8,0x38,0xb8,0x78,0xf8,
0x04,0x84,0x44,0xc4,0x24,0xa4,0x64,0xe4,0x14,0x9 4, 0x54,0xd4,0x34,0xb4,0x74,0xf4,
0x0c,0x8c,0x4c,0xcc,0x2c,0xac,0x6c,0xec,0x1c,0x9 c, 0x5c,0xdc,0x3c,0xbc,0x7c,0xfc,
0x02,0x82,0x42,0xc2,0x22,0xa2,0x62,0xe2,0x12,0x9 2, 0x52,0xd2,0x32,0xb2,0x72,0xf2,
0x0a,0x8a,0x4a,0xca,0x2a,0xaa,0x6a,0xea,0x1a,0x9 a, 0x5a,0xda,0x3a,0xba,0x7a,0xfa,
0x06,0x86,0x46,0xc6,0x26,0xa6,0x66,0xe6,0x16,0x9 6, 0x56,0xd6,0x36,0xb6,0x76,0xf6,
0x0e,0x8e,0x4e,0xce,0x2e,0xae,0x6e,0xee,0x1e,0x9 e, 0x5e,0xde,0x3e,0xbe,0x7e,0xfe,
0x01,0x81,0x41,0xc1,0x21,0xa1,0x61,0xe1,0x11,0x9 1, 0x51,0xd1,0x31,0xb1,0x71,0xf1,
0x09,0x89,0x49,0xc9,0x29,0xa9,0x69,0xe9,0x19,0x9 9, 0x59,0xd9,0x39,0xb9,0x79,0xf9,
0x05,0x85,0x45,0xc5,0x25,0xa5,0x65,0xe5,0x15,0x9 5, 0x55,0xd5,0x35,0xb5,0x75,0xf5,
0x0d,0x8d,0x4d,0xcd,0x2d,0xad,0x6d,0xed,0x1d,0x9 d, 0x5d,0xdd,0x3d,0xbd,0x7d,0xfd,
0x03,0x83,0x43,0xc3,0x23,0xa3,0x63,0xe3,0x13,0x9 3, 0x53,0xd3,0x33,0xb3,0x73,0xf3,
0x0b,0x8b,0x4b,0xcb,0x2b,0xab,0x6b,0xeb,0x1b,0x9 b, 0x5b,0xdb,0x3b,0xbb,0x7b,0xfb,
0x07,0x87,0x47,0xc7,0x27,0xa7,0x67,0xe7,0x17,0x9 7, 0x57,0xd7,0x37,0xb7,0x77,0xf7,
0x0f,0x8f,0x4f,0xcf,0x2f,0xaf,0x6f,0xef,0x1f,0x9 f, 0x5f,0xdf,0x3f,0xbf,0x7f,0xff
};

unsigned char CSSt5[256]= {
0xff,0x7f,0xbf,0x3f,0xdf,0x5f,0x9f,0x1f,0xef,0x6 f, 0xaf,0x2f,0xcf,0x4f,0x8f,0x0f,
0xf7,0x77,0xb7,0x37,0xd7,0x57,0x97,0x17,0xe7,0x6 7, 0xa7,0x27,0xc7,0x47,0x87,0x07,
0xfb,0x7b,0xbb,0x3b,0xdb,0x5b,0x9b,0x1b,0xeb,0x6 b, 0xab,0x2b,0xcb,0x4b,0x8b,0x0b,
0xf3,0x73,0xb3,0x33,0xd3,0x53,0x93,0x13,0xe3,0x6 3, 0xa3,0x23,0xc3,0x43,0x83,0x03,
0xfd,0x7d,0xbd,0x3d,0xdd,0x5d,0x9d,0x1d,0xed,0x6 d, 0xad,0x2d,0xcd,0x4d,0x8d,0x0d,
0xf5,0x75,0xb5,0x35,0xd5,0x55,0x95,0x15,0xe5,0x6 5, 0xa5,0x25,0xc5,0x45,0x85,0x05,
0xf9,0x79,0xb9,0x39,0xd9,0x59,0x99,0x19,0xe9,0x6 9, 0xa9,0x29,0xc9,0x49,0x89,0x09,
0xf1,0x71,0xb1,0x31,0xd1,0x51,0x91,0x11,0xe1,0x6 1, 0xa1,0x21,0xc1,0x41,0x81,0x01,
0xfe,0x7e,0xbe,0x3e,0xde,0x5e,0x9e,0x1e,0xee,0x6 e, 0xae,0x2e,0xce,0x4e,0x8e,0x0e,
0xf6,0x76,0xb6,0x36,0xd6,0x56,0x96,0x16,0xe6,0x6 6, 0xa6,0x26,0xc6,0x46,0x86,0x06,
0xfa,0x7a,0xba,0x3a,0xda,0x5a,0x9a,0x1a,0xea,0x6 a, 0xaa,0x2a,0xca,0x4a,0x8a,0x0a,
0xf2,0x72,0xb2,0x32,0xd2,0x52,0x92,0x12,0xe2,0x6 2, 0xa2,0x22,0xc2,0x42,0x82,0x02,
0xfc,0x7c,0xbc,0x3c,0xdc,0x5c,0x9c,0x1c,0xec,0x6 c, 0xac,0x2c,0xcc,0x4c,0x8c,0x0c,
0xf4,0x74,0xb4,0x34,0xd4,0x54,0x94,0x14,0xe4,0x6 4, 0xa4,0x24,0xc4,0x44,0x84,0x04,
0xf8,0x78,0xb8,0x38,0xd8,0x58,0x98,0x18,0xe8,0x6 8, 0xa8,0x28,0xc8,0x48,0x88,0x08,
0xf0,0x70,0xb0,0x30,0xd0,0x50,0x90,0x10,0xe0,0x6 0, 0xa0,0x20,0xc0,0x40,0x80,0x00
};

void CSSdescramble(unsigned char *sec,unsigned char *key) {
unsigned int t1,t2,t3,t4,t5,t6;
unsigned char *end=sec+0x800;
t1=key[0]^sec[0x54]|0x100;
t2=key[1]^sec[0x55];
t3=(*((unsigned int *)(key+2)))^(*((unsigned int *)(sec+0x56)));
t4=t3
t3=t3*2+8-t4;
sec+=0x80;
t5=0;
while(sec!=end) {
t4=CSSt2[t2]^CSSt3[t1];
t2=t1>>1;
t1=((t1&1)>3)^t3)>>1)^t3)>>8)^t3)>>5)
t3=(t3>=8;
}
}

void CSStitlekey1(unsigned char *key,unsigned char *im) {
unsigned int t1,t2,t3,t4,t5,t6;
unsigned char k[5];
int i;
t1=im[0]|0x100;
t2=im[1];
t3=*((unsigned int *)(im+2));
t4=t3
t3=t3*2+8-t4;
t5=0;
for(i=0;i>1;
t1=((t1&1)>3)^t3)>>1)^t3)>>8)^t3)>>5)
t3=(t3>=8;
}
for(i=9;i>=0;i--)
key[CSSt0[i+1]]=k[CSSt0[i+1]]^CSSt1[key[CSSt0[i+1] ]]^key[CSSt0[i]];
}

void CSStitlekey2(unsigned char *key,unsigned char *im) {
unsigned int t1,t2,t3,t4,t5,t6;
unsigned char k[5];
int i;
t1=im[0]|0x100;
t2=im[1];
t3=*((unsigned int *)(im+2));
t4=t3
t3=t3*2+8-t4;
t5=0;
for(i=0;i>1;
t1=((t1&1)>3)^t3)>>1)^t3)>>8)^t3)>>5)
t3=(t3>=8;
}
for(i=9;i>=0;i--)
key[CSSt0[i+1]]=k[CSSt0[i+1]]^CSSt1[key[CSSt0[i+1] ]]^key[CSSt0[i]];
}

void CSSdecrypttitlekey(unsigned char *tkey,unsigned char *dkey) {
int i;
unsigned char im1[6];
unsigned char im2[6]={0x51,0x67,0x67,0xc5,0xe0,0x00};
for(i=0;i6;i++)
im1[i]=dkey[i];
CSStitlekey1(im1,im2);
CSStitlekey2(tkey,im1);
}

/* Please check with any laws that may exist making this program illegal. This program relates to this article, and has educational purpose. For this reason, there shouldnt be any legalities against this application. */