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mpeg3css.c
资源名称：NETVIDEO.rar　[点击查看]
上传用户：sun1608
上传日期：2007-02-02
资源大小：6116k
文件大小：34k
源码类别：

流媒体/Mpeg4/MP4

开发平台：

Visual C++

mpeg3css.c：源码内容
  1. /*
  2.  * Copyright (C) 2000 Derek Fawcus et. al.  <derek@spider.com>
  3.  * Ported to libmpeg3 by et. al.
  4.  *
  5.  * This code may be used under the terms of Version 2 of the GPL,
  6.  * read the file COPYING for details.
  7.  *
  8.  */
  10. /*
  11.  * These routines do some reordering of the supplied data before
  12.  * calling engine() to do the main work.
  13.  *
  14.  * The reordering seems similar to that done by the initial stages of
  15.  * the DES algorithm, in that it looks like it's just been done to
  16.  * try and make software decoding slower.  I'm not sure that it
  17.  * actually adds anything to the security.
  18.  *
  19.  * The nature of the shuffling is that the bits of the supplied
  20.  * parameter 'varient' are reorganised (and some inverted),  and
  21.  * the bytes of the parameter 'challenge' are reorganised.
  22.  *
  23.  * The reorganisation in each routine is different,  and the first
  24.  * (CryptKey1) does not bother of play with the 'varient' parameter.
  25.  *
  26.  * Since this code is only run once per disk change,  I've made the
  27.  * code table driven in order to improve readability.
  28.  *
  29.  * Since these routines are so similar to each other,  one could even
  30.  * abstract them all to one routine supplied a parameter determining
  31.  * the nature of the reordering it has to do.
  32.  */
  35. #if defined(HAVE_CSS) && defined(HAVE_LINUX_CDROM_H)
  37. #include "mpeg3css.h"
  38. #include "mpeg3private.h"
  39. #include <config.h>
  40. #include <unistd.h>
  41. #include <fcntl.h>
  42. #include <stdlib.h>
  43. #include <string.h>
  44. #include <sys/ioctl.h>
  45. #include <sys/types.h>
  46. #include <sys/stat.h>
  47. #include <sys/types.h>
  48. #include <linux/cdrom.h>
  50. #ifndef FIBMAP
  51. #define FIBMAP    _IO(0x00,1) /* bmap access */
  52. //#define FIBMAP 1
  53. #endif
  55. /* =================================== TABLES ================================ */
  57. static unsigned char mpeg3css_varients[] = 
  58. {
  59. 0xB7, 0x74, 0x85, 0xD0, 0xCC, 0xDB, 0xCA, 0x73,
  60. 0x03, 0xFE, 0x31, 0x03, 0x52, 0xE0, 0xB7, 0x42,
  61. 0x63, 0x16, 0xF2, 0x2A, 0x79, 0x52, 0xFF, 0x1B,
  62. 0x7A, 0x11, 0xCA, 0x1A, 0x9B, 0x40, 0xAD, 0x01
  63. };
  65. static unsigned char mpeg3css_secret[] = {0x55, 0xD6, 0xC4, 0xC5, 0x28};
  67. static unsigned char mpeg3css_table0[] = 
  68. {
  69. 0xB7, 0xF4, 0x82, 0x57, 0xDA, 0x4D, 0xDB, 0xE2,
  70. 0x2F, 0x52, 0x1A, 0xA8, 0x68, 0x5A, 0x8A, 0xFF,
  71. 0xFB, 0x0E, 0x6D, 0x35, 0xF7, 0x5C, 0x76, 0x12,
  72. 0xCE, 0x25, 0x79, 0x29, 0x39, 0x62, 0x08, 0x24,
  73. 0xA5, 0x85, 0x7B, 0x56, 0x01, 0x23, 0x68, 0xCF,
  74. 0x0A, 0xE2, 0x5A, 0xED, 0x3D, 0x59, 0xB0, 0xA9,
  75. 0xB0, 0x2C, 0xF2, 0xB8, 0xEF, 0x32, 0xA9, 0x40,
  76. 0x80, 0x71, 0xAF, 0x1E, 0xDE, 0x8F, 0x58, 0x88,
  77. 0xB8, 0x3A, 0xD0, 0xFC, 0xC4, 0x1E, 0xB5, 0xA0,
  78. 0xBB, 0x3B, 0x0F, 0x01, 0x7E, 0x1F, 0x9F, 0xD9,
  79. 0xAA, 0xB8, 0x3D, 0x9D, 0x74, 0x1E, 0x25, 0xDB,
  80. 0x37, 0x56, 0x8F, 0x16, 0xBA, 0x49, 0x2B, 0xAC,
  81. 0xD0, 0xBD, 0x95, 0x20, 0xBE, 0x7A, 0x28, 0xD0,
  82. 0x51, 0x64, 0x63, 0x1C, 0x7F, 0x66, 0x10, 0xBB,
  83. 0xC4, 0x56, 0x1A, 0x04, 0x6E, 0x0A, 0xEC, 0x9C,
  84. 0xD6, 0xE8, 0x9A, 0x7A, 0xCF, 0x8C, 0xDB, 0xB1,
  85. 0xEF, 0x71, 0xDE, 0x31, 0xFF, 0x54, 0x3E, 0x5E,
  86. 0x07, 0x69, 0x96, 0xB0, 0xCF, 0xDD, 0x9E, 0x47,
  87. 0xC7, 0x96, 0x8F, 0xE4, 0x2B, 0x59, 0xC6, 0xEE,
  88. 0xB9, 0x86, 0x9A, 0x64, 0x84, 0x72, 0xE2, 0x5B,
  89. 0xA2, 0x96, 0x58, 0x99, 0x50, 0x03, 0xF5, 0x38,
  90. 0x4D, 0x02, 0x7D, 0xE7, 0x7D, 0x75, 0xA7, 0xB8,
  91. 0x67, 0x87, 0x84, 0x3F, 0x1D, 0x11, 0xE5, 0xFC,
  92. 0x1E, 0xD3, 0x83, 0x16, 0xA5, 0x29, 0xF6, 0xC7,
  93. 0x15, 0x61, 0x29, 0x1A, 0x43, 0x4F, 0x9B, 0xAF,
  94. 0xC5, 0x87, 0x34, 0x6C, 0x0F, 0x3B, 0xA8, 0x1D,
  95. 0x45, 0x58, 0x25, 0xDC, 0xA8, 0xA3, 0x3B, 0xD1,
  96. 0x79, 0x1B, 0x48, 0xF2, 0xE9, 0x93, 0x1F, 0xFC,
  97. 0xDB, 0x2A, 0x90, 0xA9, 0x8A, 0x3D, 0x39, 0x18,
  98. 0xA3, 0x8E, 0x58, 0x6C, 0xE0, 0x12, 0xBB, 0x25,
  99. 0xCD, 0x71, 0x22, 0xA2, 0x64, 0xC6, 0xE7, 0xFB,
  100. 0xAD, 0x94, 0x77, 0x04, 0x9A, 0x39, 0xCF, 0x7C
  101. };
  103. static unsigned char mpeg3css_table1[] = 
  104. {
  105. 0x8C, 0x47, 0xB0, 0xE1, 0xEB, 0xFC, 0xEB, 0x56,
  106. 0x10, 0xE5, 0x2C, 0x1A, 0x5D, 0xEF, 0xBE, 0x4F,
  107. 0x08, 0x75, 0x97, 0x4B, 0x0E, 0x25, 0x8E, 0x6E,
  108. 0x39, 0x5A, 0x87, 0x53, 0xC4, 0x1F, 0xF4, 0x5C,
  109. 0x4E, 0xE6, 0x99, 0x30, 0xE0, 0x42, 0x88, 0xAB,
  110. 0xE5, 0x85, 0xBC, 0x8F, 0xD8, 0x3C, 0x54, 0xC9,
  111. 0x53, 0x47, 0x18, 0xD6, 0x06, 0x5B, 0x41, 0x2C,
  112. 0x67, 0x1E, 0x41, 0x74, 0x33, 0xE2, 0xB4, 0xE0,
  113. 0x23, 0x29, 0x42, 0xEA, 0x55, 0x0F, 0x25, 0xB4,
  114. 0x24, 0x2C, 0x99, 0x13, 0xEB, 0x0A, 0x0B, 0xC9,
  115. 0xF9, 0x63, 0x67, 0x43, 0x2D, 0xC7, 0x7D, 0x07,
  116. 0x60, 0x89, 0xD1, 0xCC, 0xE7, 0x94, 0x77, 0x74,
  117. 0x9B, 0x7E, 0xD7, 0xE6, 0xFF, 0xBB, 0x68, 0x14,
  118. 0x1E, 0xA3, 0x25, 0xDE, 0x3A, 0xA3, 0x54, 0x7B,
  119. 0x87, 0x9D, 0x50, 0xCA, 0x27, 0xC3, 0xA4, 0x50,
  120. 0x91, 0x27, 0xD4, 0xB0, 0x82, 0x41, 0x97, 0x79,
  121. 0x94, 0x82, 0xAC, 0xC7, 0x8E, 0xA5, 0x4E, 0xAA,
  122. 0x78, 0x9E, 0xE0, 0x42, 0xBA, 0x28, 0xEA, 0xB7,
  123. 0x74, 0xAD, 0x35, 0xDA, 0x92, 0x60, 0x7E, 0xD2,
  124. 0x0E, 0xB9, 0x24, 0x5E, 0x39, 0x4F, 0x5E, 0x63,
  125. 0x09, 0xB5, 0xFA, 0xBF, 0xF1, 0x22, 0x55, 0x1C,
  126. 0xE2, 0x25, 0xDB, 0xC5, 0xD8, 0x50, 0x03, 0x98,
  127. 0xC4, 0xAC, 0x2E, 0x11, 0xB4, 0x38, 0x4D, 0xD0,
  128. 0xB9, 0xFC, 0x2D, 0x3C, 0x08, 0x04, 0x5A, 0xEF,
  129. 0xCE, 0x32, 0xFB, 0x4C, 0x92, 0x1E, 0x4B, 0xFB,
  130. 0x1A, 0xD0, 0xE2, 0x3E, 0xDA, 0x6E, 0x7C, 0x4D,
  131. 0x56, 0xC3, 0x3F, 0x42, 0xB1, 0x3A, 0x23, 0x4D,
  132. 0x6E, 0x84, 0x56, 0x68, 0xF4, 0x0E, 0x03, 0x64,
  133. 0xD0, 0xA9, 0x92, 0x2F, 0x8B, 0xBC, 0x39, 0x9C,
  134. 0xAC, 0x09, 0x5E, 0xEE, 0xE5, 0x97, 0xBF, 0xA5,
  135. 0xCE, 0xFA, 0x28, 0x2C, 0x6D, 0x4F, 0xEF, 0x77,
  136. 0xAA, 0x1B, 0x79, 0x8E, 0x97, 0xB4, 0xC3, 0xF4
  137. };
  139. static unsigned char mpeg3css_table2[] = 
  140. {
  141. 0xB7, 0x75, 0x81, 0xD5, 0xDC, 0xCA, 0xDE, 0x66,
  142. 0x23, 0xDF, 0x15, 0x26, 0x62, 0xD1, 0x83, 0x77,
  143. 0xE3, 0x97, 0x76, 0xAF, 0xE9, 0xC3, 0x6B, 0x8E,
  144. 0xDA, 0xB0, 0x6E, 0xBF, 0x2B, 0xF1, 0x19, 0xB4,
  145. 0x95, 0x34, 0x48, 0xE4, 0x37, 0x94, 0x5D, 0x7B,
  146. 0x36, 0x5F, 0x65, 0x53, 0x07, 0xE2, 0x89, 0x11,
  147. 0x98, 0x85, 0xD9, 0x12, 0xC1, 0x9D, 0x84, 0xEC,
  148. 0xA4, 0xD4, 0x88, 0xB8, 0xFC, 0x2C, 0x79, 0x28,
  149. 0xD8, 0xDB, 0xB3, 0x1E, 0xA2, 0xF9, 0xD0, 0x44,
  150. 0xD7, 0xD6, 0x60, 0xEF, 0x14, 0xF4, 0xF6, 0x31,
  151. 0xD2, 0x41, 0x46, 0x67, 0x0A, 0xE1, 0x58, 0x27,
  152. 0x43, 0xA3, 0xF8, 0xE0, 0xC8, 0xBA, 0x5A, 0x5C,
  153. 0x80, 0x6C, 0xC6, 0xF2, 0xE8, 0xAD, 0x7D, 0x04,
  154. 0x0D, 0xB9, 0x3C, 0xC2, 0x25, 0xBD, 0x49, 0x63,
  155. 0x8C, 0x9F, 0x51, 0xCE, 0x20, 0xC5, 0xA1, 0x50,
  156. 0x92, 0x2D, 0xDD, 0xBC, 0x8D, 0x4F, 0x9A, 0x71,
  157. 0x2F, 0x30, 0x1D, 0x73, 0x39, 0x13, 0xFB, 0x1A,
  158. 0xCB, 0x24, 0x59, 0xFE, 0x05, 0x96, 0x57, 0x0F,
  159. 0x1F, 0xCF, 0x54, 0xBE, 0xF5, 0x06, 0x1B, 0xB2,
  160. 0x6D, 0xD3, 0x4D, 0x32, 0x56, 0x21, 0x33, 0x0B,
  161. 0x52, 0xE7, 0xAB, 0xEB, 0xA6, 0x74, 0x00, 0x4C,
  162. 0xB1, 0x7F, 0x82, 0x99, 0x87, 0x0E, 0x5E, 0xC0,
  163. 0x8F, 0xEE, 0x6F, 0x55, 0xF3, 0x7E, 0x08, 0x90,
  164. 0xFA, 0xB6, 0x64, 0x70, 0x47, 0x4A, 0x17, 0xA7,
  165. 0xB5, 0x40, 0x8A, 0x38, 0xE5, 0x68, 0x3E, 0x8B,
  166. 0x69, 0xAA, 0x9B, 0x42, 0xA5, 0x10, 0x01, 0x35,
  167. 0xFD, 0x61, 0x9E, 0xE6, 0x16, 0x9C, 0x86, 0xED,
  168. 0xCD, 0x2E, 0xFF, 0xC4, 0x5B, 0xA0, 0xAE, 0xCC,
  169. 0x4B, 0x3B, 0x03, 0xBB, 0x1C, 0x2A, 0xAC, 0x0C,
  170. 0x3F, 0x93, 0xC7, 0x72, 0x7A, 0x09, 0x22, 0x3D,
  171. 0x45, 0x78, 0xA9, 0xA8, 0xEA, 0xC9, 0x6A, 0xF7,
  172. 0x29, 0x91, 0xF0, 0x02, 0x18, 0x3A, 0x4E, 0x7C
  173. };
  175. static unsigned char mpeg3css_table3[] = 
  176. {
  177. 0x73, 0x51, 0x95, 0xE1, 0x12, 0xE4, 0xC0, 0x58,
  178. 0xEE, 0xF2, 0x08, 0x1B, 0xA9, 0xFA, 0x98, 0x4C,
  179. 0xA7, 0x33, 0xE2, 0x1B, 0xA7, 0x6D, 0xF5, 0x30,
  180. 0x97, 0x1D, 0xF3, 0x02, 0x60, 0x5A, 0x82, 0x0F,
  181. 0x91, 0xD0, 0x9C, 0x10, 0x39, 0x7A, 0x83, 0x85,
  182. 0x3B, 0xB2, 0xB8, 0xAE, 0x0C, 0x09, 0x52, 0xEA,
  183. 0x1C, 0xE1, 0x8D, 0x66, 0x4F, 0xF3, 0xDA, 0x92,
  184. 0x29, 0xB9, 0xD5, 0xC5, 0x77, 0x47, 0x22, 0x53,
  185. 0x14, 0xF7, 0xAF, 0x22, 0x64, 0xDF, 0xC6, 0x72,
  186. 0x12, 0xF3, 0x75, 0xDA, 0xD7, 0xD7, 0xE5, 0x02,
  187. 0x9E, 0xED, 0xDA, 0xDB, 0x4C, 0x47, 0xCE, 0x91,
  188. 0x06, 0x06, 0x6D, 0x55, 0x8B, 0x19, 0xC9, 0xEF,
  189. 0x8C, 0x80, 0x1A, 0x0E, 0xEE, 0x4B, 0xAB, 0xF2,
  190. 0x08, 0x5C, 0xE9, 0x37, 0x26, 0x5E, 0x9A, 0x90,
  191. 0x00, 0xF3, 0x0D, 0xB2, 0xA6, 0xA3, 0xF7, 0x26,
  192. 0x17, 0x48, 0x88, 0xC9, 0x0E, 0x2C, 0xC9, 0x02,
  193. 0xE7, 0x18, 0x05, 0x4B, 0xF3, 0x39, 0xE1, 0x20,
  194. 0x02, 0x0D, 0x40, 0xC7, 0xCA, 0xB9, 0x48, 0x30,
  195. 0x57, 0x67, 0xCC, 0x06, 0xBF, 0xAC, 0x81, 0x08,
  196. 0x24, 0x7A, 0xD4, 0x8B, 0x19, 0x8E, 0xAC, 0xB4,
  197. 0x5A, 0x0F, 0x73, 0x13, 0xAC, 0x9E, 0xDA, 0xB6,
  198. 0xB8, 0x96, 0x5B, 0x60, 0x88, 0xE1, 0x81, 0x3F,
  199. 0x07, 0x86, 0x37, 0x2D, 0x79, 0x14, 0x52, 0xEA,
  200. 0x73, 0xDF, 0x3D, 0x09, 0xC8, 0x25, 0x48, 0xD8,
  201. 0x75, 0x60, 0x9A, 0x08, 0x27, 0x4A, 0x2C, 0xB9,
  202. 0xA8, 0x8B, 0x8A, 0x73, 0x62, 0x37, 0x16, 0x02,
  203. 0xBD, 0xC1, 0x0E, 0x56, 0x54, 0x3E, 0x14, 0x5F,
  204. 0x8C, 0x8F, 0x6E, 0x75, 0x1C, 0x07, 0x39, 0x7B,
  205. 0x4B, 0xDB, 0xD3, 0x4B, 0x1E, 0xC8, 0x7E, 0xFE,
  206. 0x3E, 0x72, 0x16, 0x83, 0x7D, 0xEE, 0xF5, 0xCA,
  207. 0xC5, 0x18, 0xF9, 0xD8, 0x68, 0xAB, 0x38, 0x85,
  208. 0xA8, 0xF0, 0xA1, 0x73, 0x9F, 0x5D, 0x19, 0x0B,
  209. 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  210. 0x33, 0x72, 0x39, 0x25, 0x67, 0x26, 0x6D, 0x71,
  211. 0x36, 0x77, 0x3C, 0x20, 0x62, 0x23, 0x68, 0x74,
  212. 0xC3, 0x82, 0xC9, 0x15, 0x57, 0x16, 0x5D, 0x81
  213. };
  215. static struct mpeg3_playkey mpeg3_pkey1a1 = {0x36b, {0x51,0x67,0x67,0xc5,0xe0}};
  216. static struct mpeg3_playkey mpeg3_pkey2a1 = {0x762, {0x2c,0xb2,0xc1,0x09,0xee}};
  217. static struct mpeg3_playkey mpeg3_pkey1b1 = {0x36b, {0x90,0xc1,0xd7,0x84,0x48}};
  219. static struct mpeg3_playkey mpeg3_pkey1a2 = {0x2f3, {0x51,0x67,0x67,0xc5,0xe0}};
  220. static struct mpeg3_playkey mpeg3_pkey2a2 = {0x730, {0x2c,0xb2,0xc1,0x09,0xee}};
  221. static struct mpeg3_playkey mpeg3_pkey1b2 = {0x2f3, {0x90,0xc1,0xd7,0x84,0x48}};
  223. static struct mpeg3_playkey mpeg3_pkey1a3 = {0x235, {0x51,0x67,0x67,0xc5,0xe0}};
  224. static struct mpeg3_playkey mpeg3_pkey1b3 = {0x235, {0x90,0xc1,0xd7,0x84,0x48}};
  226. static struct mpeg3_playkey mpeg3_pkey3a1 = {0x249, {0xb7,0x3f,0xd4,0xaa,0x14}}; /* DVD specific ? */
  227. static struct mpeg3_playkey mpeg3_pkey4a1 = {0x028, {0x53,0xd4,0xf7,0xd9,0x8f}}; /* DVD specific ? */
  229. static struct mpeg3_playkey *mpeg3_playkeys[] = 
  230. {
  231. &mpeg3_pkey1a1, &mpeg3_pkey2a1, &mpeg3_pkey1b1,
  232. &mpeg3_pkey1a2, &mpeg3_pkey2a2, &mpeg3_pkey1b2,
  233. &mpeg3_pkey1a3, &mpeg3_pkey1b3,
  234. &mpeg3_pkey3a1, &mpeg3_pkey4a1,
  235. NULL
  236. };
  238. /*
  239.  *
  240.  *  some tables used for descrambling sectors and/or decrypting title keys
  241.  *
  242.  */
  244. static unsigned char csstab1[256]=
  245. {
  246. 0x33,0x73,0x3b,0x26,0x63,0x23,0x6b,0x76,0x3e,0x7e,0x36,0x2b,0x6e,0x2e,0x66,0x7b,
  247. 0xd3,0x93,0xdb,0x06,0x43,0x03,0x4b,0x96,0xde,0x9e,0xd6,0x0b,0x4e,0x0e,0x46,0x9b,
  248. 0x57,0x17,0x5f,0x82,0xc7,0x87,0xcf,0x12,0x5a,0x1a,0x52,0x8f,0xca,0x8a,0xc2,0x1f,
  249. 0xd9,0x99,0xd1,0x00,0x49,0x09,0x41,0x90,0xd8,0x98,0xd0,0x01,0x48,0x08,0x40,0x91,
  250. 0x3d,0x7d,0x35,0x24,0x6d,0x2d,0x65,0x74,0x3c,0x7c,0x34,0x25,0x6c,0x2c,0x64,0x75,
  251. 0xdd,0x9d,0xd5,0x04,0x4d,0x0d,0x45,0x94,0xdc,0x9c,0xd4,0x05,0x4c,0x0c,0x44,0x95,
  252. 0x59,0x19,0x51,0x80,0xc9,0x89,0xc1,0x10,0x58,0x18,0x50,0x81,0xc8,0x88,0xc0,0x11,
  253. 0xd7,0x97,0xdf,0x02,0x47,0x07,0x4f,0x92,0xda,0x9a,0xd2,0x0f,0x4a,0x0a,0x42,0x9f,
  254. 0x53,0x13,0x5b,0x86,0xc3,0x83,0xcb,0x16,0x5e,0x1e,0x56,0x8b,0xce,0x8e,0xc6,0x1b,
  255. 0xb3,0xf3,0xbb,0xa6,0xe3,0xa3,0xeb,0xf6,0xbe,0xfe,0xb6,0xab,0xee,0xae,0xe6,0xfb,
  256. 0x37,0x77,0x3f,0x22,0x67,0x27,0x6f,0x72,0x3a,0x7a,0x32,0x2f,0x6a,0x2a,0x62,0x7f,
  257. 0xb9,0xf9,0xb1,0xa0,0xe9,0xa9,0xe1,0xf0,0xb8,0xf8,0xb0,0xa1,0xe8,0xa8,0xe0,0xf1,
  258. 0x5d,0x1d,0x55,0x84,0xcd,0x8d,0xc5,0x14,0x5c,0x1c,0x54,0x85,0xcc,0x8c,0xc4,0x15,
  259. 0xbd,0xfd,0xb5,0xa4,0xed,0xad,0xe5,0xf4,0xbc,0xfc,0xb4,0xa5,0xec,0xac,0xe4,0xf5,
  260. 0x39,0x79,0x31,0x20,0x69,0x29,0x61,0x70,0x38,0x78,0x30,0x21,0x68,0x28,0x60,0x71,
  261. 0xb7,0xf7,0xbf,0xa2,0xe7,0xa7,0xef,0xf2,0xba,0xfa,0xb2,0xaf,0xea,0xaa,0xe2,0xff
  262. };
  264. static unsigned char lfsr1_bits0[256]=
  265. {
  266. 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x09,0x08,0x0b,0x0a,0x0d,0x0c,0x0f,0x0e,
  267. 0x12,0x13,0x10,0x11,0x16,0x17,0x14,0x15,0x1b,0x1a,0x19,0x18,0x1f,0x1e,0x1d,0x1c,
  268. 0x24,0x25,0x26,0x27,0x20,0x21,0x22,0x23,0x2d,0x2c,0x2f,0x2e,0x29,0x28,0x2b,0x2a,
  269. 0x36,0x37,0x34,0x35,0x32,0x33,0x30,0x31,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,
  270. 0x49,0x48,0x4b,0x4a,0x4d,0x4c,0x4f,0x4e,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,
  271. 0x5b,0x5a,0x59,0x58,0x5f,0x5e,0x5d,0x5c,0x52,0x53,0x50,0x51,0x56,0x57,0x54,0x55,
  272. 0x6d,0x6c,0x6f,0x6e,0x69,0x68,0x6b,0x6a,0x64,0x65,0x66,0x67,0x60,0x61,0x62,0x63,
  273. 0x7f,0x7e,0x7d,0x7c,0x7b,0x7a,0x79,0x78,0x76,0x77,0x74,0x75,0x72,0x73,0x70,0x71,
  274. 0x92,0x93,0x90,0x91,0x96,0x97,0x94,0x95,0x9b,0x9a,0x99,0x98,0x9f,0x9e,0x9d,0x9c,
  275. 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x89,0x88,0x8b,0x8a,0x8d,0x8c,0x8f,0x8e,
  276. 0xb6,0xb7,0xb4,0xb5,0xb2,0xb3,0xb0,0xb1,0xbf,0xbe,0xbd,0xbc,0xbb,0xba,0xb9,0xb8,
  277. 0xa4,0xa5,0xa6,0xa7,0xa0,0xa1,0xa2,0xa3,0xad,0xac,0xaf,0xae,0xa9,0xa8,0xab,0xaa,
  278. 0xdb,0xda,0xd9,0xd8,0xdf,0xde,0xdd,0xdc,0xd2,0xd3,0xd0,0xd1,0xd6,0xd7,0xd4,0xd5,
  279. 0xc9,0xc8,0xcb,0xca,0xcd,0xcc,0xcf,0xce,0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,
  280. 0xff,0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf6,0xf7,0xf4,0xf5,0xf2,0xf3,0xf0,0xf1,
  281. 0xed,0xec,0xef,0xee,0xe9,0xe8,0xeb,0xea,0xe4,0xe5,0xe6,0xe7,0xe0,0xe1,0xe2,0xe3
  282. };
  284. static unsigned char lfsr1_bits1[512]=
  285. {
  286. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  287. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  288. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  289. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  290. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  291. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  292. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  293. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  294. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  295. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  296. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  297. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  298. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  299. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  300. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  301. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  302. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  303. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  304. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  305. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  306. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  307. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  308. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  309. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  310. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  311. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  312. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  313. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  314. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  315. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  316. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,
  317. 0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff,0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff
  318. };
  320. /* Reverse the order of the bits within a byte.
  321.  */
  322. static unsigned char bit_reverse[256]=
  323. {
  324. 0x00,0x80,0x40,0xc0,0x20,0xa0,0x60,0xe0,0x10,0x90,0x50,0xd0,0x30,0xb0,0x70,0xf0,
  325. 0x08,0x88,0x48,0xc8,0x28,0xa8,0x68,0xe8,0x18,0x98,0x58,0xd8,0x38,0xb8,0x78,0xf8,
  326. 0x04,0x84,0x44,0xc4,0x24,0xa4,0x64,0xe4,0x14,0x94,0x54,0xd4,0x34,0xb4,0x74,0xf4,
  327. 0x0c,0x8c,0x4c,0xcc,0x2c,0xac,0x6c,0xec,0x1c,0x9c,0x5c,0xdc,0x3c,0xbc,0x7c,0xfc,
  328. 0x02,0x82,0x42,0xc2,0x22,0xa2,0x62,0xe2,0x12,0x92,0x52,0xd2,0x32,0xb2,0x72,0xf2,
  329. 0x0a,0x8a,0x4a,0xca,0x2a,0xaa,0x6a,0xea,0x1a,0x9a,0x5a,0xda,0x3a,0xba,0x7a,0xfa,
  330. 0x06,0x86,0x46,0xc6,0x26,0xa6,0x66,0xe6,0x16,0x96,0x56,0xd6,0x36,0xb6,0x76,0xf6,
  331. 0x0e,0x8e,0x4e,0xce,0x2e,0xae,0x6e,0xee,0x1e,0x9e,0x5e,0xde,0x3e,0xbe,0x7e,0xfe,
  332. 0x01,0x81,0x41,0xc1,0x21,0xa1,0x61,0xe1,0x11,0x91,0x51,0xd1,0x31,0xb1,0x71,0xf1,
  333. 0x09,0x89,0x49,0xc9,0x29,0xa9,0x69,0xe9,0x19,0x99,0x59,0xd9,0x39,0xb9,0x79,0xf9,
  334. 0x05,0x85,0x45,0xc5,0x25,0xa5,0x65,0xe5,0x15,0x95,0x55,0xd5,0x35,0xb5,0x75,0xf5,
  335. 0x0d,0x8d,0x4d,0xcd,0x2d,0xad,0x6d,0xed,0x1d,0x9d,0x5d,0xdd,0x3d,0xbd,0x7d,0xfd,
  336. 0x03,0x83,0x43,0xc3,0x23,0xa3,0x63,0xe3,0x13,0x93,0x53,0xd3,0x33,0xb3,0x73,0xf3,
  337. 0x0b,0x8b,0x4b,0xcb,0x2b,0xab,0x6b,0xeb,0x1b,0x9b,0x5b,0xdb,0x3b,0xbb,0x7b,0xfb,
  338. 0x07,0x87,0x47,0xc7,0x27,0xa7,0x67,0xe7,0x17,0x97,0x57,0xd7,0x37,0xb7,0x77,0xf7,
  339. 0x0f,0x8f,0x4f,0xcf,0x2f,0xaf,0x6f,0xef,0x1f,0x9f,0x5f,0xdf,0x3f,0xbf,0x7f,0xff
  340. };
  342. /* ================================= Functions ====================================== */
  344. /*
  345.  * We use two LFSR's (seeded from some of the input data bytes) to
  346.  * generate two streams of pseudo-random bits.  These two bit streams
  347.  * are then combined by simply adding with carry to generate a final
  348.  * sequence of pseudo-random bits which is stored in the buffer that
  349.  * 'output' points to the end of - len is the size of this buffer.
  350.  *
  351.  * The first LFSR is of degree 25,  and has a polynomial of:
  352.  * x^13 + x^5 + x^4 + x^1 + 1
  353.  *
  354.  * The second LSFR is of degree 17,  and has a (primitive) polynomial of:
  355.  * x^15 + x^1 + 1
  356.  *
  357.  * I don't know if these polynomials are primitive modulo 2,  and thus
  358.  * represent maximal-period LFSR's.
  359.  *
  360.  *
  361.  * Note that we take the output of each LFSR from the new shifted in
  362.  * bit,  not the old shifted out bit.  Thus for ease of use the LFSR's
  363.  * are implemented in bit reversed order.
  364.  *
  365.  */
  367. #define  BIT0(x) ((x) & 1)
  368. #define  BIT1(x) (((x) >> 1) & 1)
  370. static void generate_bits(unsigned char *output, int len, struct mpeg3_block const *s)
  371. {
  372. unsigned long lfsr0, lfsr1;
  373. unsigned char carry;
  375. /* In order to ensure that the LFSR works we need to ensure that the
  376.  * initial values are non-zero.  Thus when we initialise them from
  377.  * the seed,  we ensure that a bit is set.
  378.  */
  379. lfsr0 = (s->b[0] << 17) | (s->b[1] << 9) | ((s->b[2] & ~7) << 1) | 8 | (s->b[2] & 7);
  380. lfsr1 = (s->b[3] << 9) | 0x100 | s->b[4];
  382. ++output;
  384. carry = 0;
  385. do{
  386. int bit;
  387. unsigned char val;
  389. for (bit = 0, val = 0; bit < 8; ++bit) 
  390. {
  391. unsigned char o_lfsr0, o_lfsr1; /* Actually only 1 bit each */
  392. unsigned char combined;
  394. o_lfsr0 = ((lfsr0 >> 24) ^ (lfsr0 >> 21) ^ (lfsr0 >> 20) ^ (lfsr0 >> 12)) & 1;
  395.   lfsr0 = (lfsr0 << 1) | o_lfsr0;
  397. o_lfsr1 = ((lfsr1 >> 16) ^ (lfsr1 >> 2)) & 1;
  398.   lfsr1 = (lfsr1 << 1) | o_lfsr1;
  400. combined = !o_lfsr1 + carry + !o_lfsr0;
  401. carry = BIT1(combined);
  402. val |= BIT0(combined) << bit;
  403. }
  405. *--output = val;
  406. }while (--len > 0);
  407. }
  410. /*
  411.  * This encryption engine implements one of 32 variations
  412.  * one the same theme depending upon the choice in the
  413.  * varient parameter (0 - 31).
  414.  *
  415.  * The algorithm itself manipulates a 40 bit input into
  416.  * a 40 bit output.
  417.  * The parameter 'input' is 80 bits.  It consists of
  418.  * the 40 bit input value that is to be encrypted followed
  419.  * by a 40 bit seed value for the pseudo random number
  420.  * generators.
  421.  */
  422. static void css_engine(int varient, unsigned char const *input, struct mpeg3_block *output)
  423. {
  424. unsigned char cse, term, index;
  425. struct mpeg3_block temp1;
  426. struct mpeg3_block temp2;
  427. unsigned char bits[30];
  429. int i;
  431. /* Feed the secret into the input values such that
  432.  * we alter the seed to the LFSR's used above,  then
  433.  * generate the bits to play with.
  434.  */
  435. for(i = 5; --i >= 0; )
  436. temp1.b[i] = input[5 + i] ^ mpeg3css_secret[i] ^ mpeg3css_table2[i];
  438. generate_bits(&bits[29], sizeof bits, &temp1);
  440. /* This term is used throughout the following to
  441.  * select one of 32 different variations on the
  442.  * algorithm.
  443.  */
  444. cse = mpeg3css_varients[varient] ^ mpeg3css_table2[varient];
  446. /* Now the actual blocks doing the encryption.  Each
  447.  * of these works on 40 bits at a time and are quite
  448.  * similar.
  449.  */
  450. for(i = 5, term = 0; --i >= 0; term = input[i]) 
  451. {
  452. index = bits[25 + i] ^ input[i];
  453. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  455. temp1.b[i] = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  456. }
  457. temp1.b[4] ^= temp1.b[0];
  459. for(i = 5, term = 0; --i >= 0; term = temp1.b[i]) 
  460. {
  461. index = bits[20 + i] ^ temp1.b[i];
  462. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  464. temp2.b[i] = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  465. }
  466. temp2.b[4] ^= temp2.b[0];
  468. for (i = 5, term = 0; --i >= 0; term = temp2.b[i]) 
  469. {
  470. index = bits[15 + i] ^ temp2.b[i];
  471. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  472. index = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  474. temp1.b[i] = mpeg3css_table0[index] ^ mpeg3css_table2[index];
  475. }
  476. temp1.b[4] ^= temp1.b[0];
  478. for (i = 5, term = 0; --i >= 0; term = temp1.b[i]) 
  479. {
  480. index = bits[10 + i] ^ temp1.b[i];
  481. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  483. index = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  485. temp2.b[i] = mpeg3css_table0[index] ^ mpeg3css_table2[index];
  486. }
  487. temp2.b[4] ^= temp2.b[0];
  489. for (i = 5, term = 0; --i >= 0; term = temp2.b[i]) 
  490. {
  491. index = bits[5 + i] ^ temp2.b[i];
  492. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  494. temp1.b[i] = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  495. }
  496. temp1.b[4] ^= temp1.b[0];
  498. for (i = 5, term = 0; --i >= 0; term = temp1.b[i]) 
  499. {
  500. index = bits[i] ^ temp1.b[i];
  501. index = mpeg3css_table1[index] ^ ~mpeg3css_table2[index] ^ cse;
  503. output->b[i] = mpeg3css_table2[index] ^ mpeg3css_table3[index] ^ term;
  504. }
  505. }
  507. static void crypt_key1(mpeg3_css_t *css, int varient, unsigned char const *challenge, struct mpeg3_block *key)
  508. {
  509. static unsigned char perm_challenge[] = {1, 3, 0, 7, 5, 2, 9, 6, 4, 8};
  511. unsigned char scratch[10];
  512. int i;
  514. for (i = 9; i >= 0; i--)
  515. scratch[i] = challenge[perm_challenge[i]];
  517. css_engine(varient, scratch, key);
  518. }
  520. /* This shuffles the bits in varient to make perm_varient such that
  521.  *                4 -> !3
  522.  *                3 ->  4
  523.  * varient bits:  2 ->  0  perm_varient bits
  524.  *                1 ->  2
  525.  *                0 -> !1
  526.  */
  527. static void crypt_key2(mpeg3_css_t *css, int varient, unsigned char const *challenge, struct mpeg3_block *key)
  528. {
  529. static unsigned char perm_challenge[] = {6, 1, 9, 3, 8, 5, 7, 4, 0, 2};
  531. static unsigned char perm_varient[] = 
  532. {
  533. 0x0a, 0x08, 0x0e, 0x0c, 0x0b, 0x09, 0x0f, 0x0d,
  534. 0x1a, 0x18, 0x1e, 0x1c, 0x1b, 0x19, 0x1f, 0x1d,
  535. 0x02, 0x00, 0x06, 0x04, 0x03, 0x01, 0x07, 0x05,
  536. 0x12, 0x10, 0x16, 0x14, 0x13, 0x11, 0x17, 0x15
  537. };
  539. unsigned char scratch[10];
  540. int i;
  542. for(i = 9; i >= 0; i--)
  543. scratch[i] = css->challenge[perm_challenge[i]];
  545. css_engine(perm_varient[varient], scratch, key);
  546. }
  548. /* This shuffles the bits in varient to make perm_varient such that
  549.  *                4 ->  0
  550.  *                3 -> !1
  551.  * varient bits:  2 -> !4  perm_varient bits
  552.  *                1 ->  2
  553.  *                0 ->  3
  554.  */
  555. static void crypt_bus_key(mpeg3_css_t *css, int varient, unsigned char const *challenge, struct mpeg3_block *key)
  556. {
  557. static unsigned char perm_challenge[] = {4,0,3,5,7, 2,8,6,1,9};
  558. static unsigned char perm_varient[] = {
  559. 0x12, 0x1a, 0x16, 0x1e, 0x02, 0x0a, 0x06, 0x0e,
  560. 0x10, 0x18, 0x14, 0x1c, 0x00, 0x08, 0x04, 0x0c,
  561. 0x13, 0x1b, 0x17, 0x1f, 0x03, 0x0b, 0x07, 0x0f,
  562. 0x11, 0x19, 0x15, 0x1d, 0x01, 0x09, 0x05, 0x0d};
  564. unsigned char scratch[10];
  565. int i;
  567. for(i = 9; i >= 0; i--)
  568. scratch[i] = css->challenge[perm_challenge[i]];
  570. css_engine(perm_varient[varient], scratch, key);
  571. }
  573. static int get_asf(mpeg3_css_t *css)
  574. {
  575. dvd_authinfo ai;
  577. ai.type = DVD_LU_SEND_ASF;
  578. ai.lsasf.agid = 0;
  579. ai.lsasf.asf = 0;
  581. if(ioctl(css->fd, DVD_AUTH, &ai))
  582. {
  583. /* Exit here for a hard drive or unencrypted CD-ROM. */
  584. return 1;
  585. }
  587. return 0;
  588. }
  590. static int authenticate_drive(mpeg3_css_t *css, const unsigned char *key)
  591. {
  592. int i;
  594. for(i = 0; i < 5; i++)
  595. css->key1.b[i] = key[4 - i];
  597. for(i = 0; i < 32; ++i)
  598. {
  599. crypt_key1(css, i, css->challenge, &(css->keycheck));
  600. if(memcmp(css->keycheck.b, css->key1.b, 5) == 0)
  601. {
  602. css->varient = i;
  603. return 0;
  604. }
  605. }
  607. if (css->varient == -1) return 1;
  609. return 0;
  610. }
  612. /* Simulation of a non-CSS compliant host (i.e. the authentication fails,
  613.  * but idea is here for a real CSS compliant authentication scheme). */
  614. static int hostauth(mpeg3_css_t *css, dvd_authinfo *ai)
  615. {
  616. int i;
  618. switch(ai->type) 
  619. {
  620. /* Host data receive (host changes state) */
  621. case DVD_LU_SEND_AGID:
  622. ai->type = DVD_HOST_SEND_CHALLENGE;
  623. break;
  625. case DVD_LU_SEND_KEY1:
  626. /* printf("Key 1: %02x %02x %02x %02x %02xn",  */
  627. /*  ai->lsk.key[4], ai->lsk.key[3], ai->lsk.key[2], ai->lsk.key[1], ai->lsk.key[0]); */
  628. if(authenticate_drive(css, ai->lsk.key)) 
  629. {
  630. ai->type = DVD_AUTH_FAILURE;
  631. return 1;
  632. }
  633. ai->type = DVD_LU_SEND_CHALLENGE;
  634. break;
  636. case DVD_LU_SEND_CHALLENGE:
  637. for(i = 0; i < 10; i++)
  638. css->challenge[i] = ai->hsc.chal[9-i];
  639. crypt_key2(css, css->varient, css->challenge, &(css->key2));
  640. ai->type = DVD_HOST_SEND_KEY2;
  641. break;
  643. /* Host data send */
  644. case DVD_HOST_SEND_CHALLENGE:
  645. for(i = 0; i < 10; i++)
  646. ai->hsc.chal[9 - i] = css->challenge[i];
  647. /* Returning data, let LU change state */
  648. break;
  650. case DVD_HOST_SEND_KEY2:
  651. for(i = 0; i < 5; i++)
  652. {
  653. ai->hsk.key[4 - i] = css->key2.b[i];
  654. }
  655. /* printf("Key 2: %02x %02x %02x %02x %02xn",  */
  656. /*  ai->hsk.key[4], ai->hsk.key[3], ai->hsk.key[2], ai->hsk.key[1], ai->hsk.key[0]); */
  657. /* Returning data, let LU change state */
  658. break;
  660. default:
  661. fprintf(stderr, "Got invalid state %dn", ai->type);
  662. return 1;
  663. }
  665. return 0;
  666. }
  668. static int get_title_key(mpeg3_css_t *css, int agid, int lba, unsigned char *key)
  669. {
  670. dvd_authinfo ai;
  671. int i;
  673. ai.type = DVD_LU_SEND_TITLE_KEY;
  675. ai.lstk.agid = agid;
  676. ai.lstk.lba = lba;
  678. if(ioctl(css->fd, DVD_AUTH, &ai))
  679. {
  680. //perror("GetTitleKey");
  681. return 1;
  682. }
  684. for (i = 0; i < 5; i++)
  685. {
  686. ai.lstk.title_key[i] ^= key[4 - (i % 5)];
  687. }
  689. /* Save the title key */
  690. for(i = 0; i < 5; i++)
  691. {
  692. css->title_key[i] = ai.lstk.title_key[i];
  693. }
  695. return 0;
  696. }
  698. static int get_disk_key(mpeg3_css_t *css, int agid, unsigned char *key)
  699. {
  700. dvd_struct s;
  701. int index, i;
  703. s.type = DVD_STRUCT_DISCKEY;
  704. s.disckey.agid = agid;
  705. memset(s.disckey.value, 0, MPEG3_DVD_PACKET_SIZE);
  706. if(ioctl(css->fd, DVD_READ_STRUCT, &s) < 0)
  707. {
  708. /*perror("get_disk_key"); */
  709. return 1;
  710. }
  712. for(index = 0; index < sizeof s.disckey.value; index ++)
  713. s.disckey.value[index] ^= key[4 - (index%5)];
  715. /* Save disk key */
  716. for(i = 0; i < MPEG3_DVD_PACKET_SIZE; i++)
  717. css->disk_key[i] = s.disckey.value[i];
  719. return 0;
  720. }
  722. static int validate(mpeg3_css_t *css, int lba, int do_title)
  723. {
  724. dvd_authinfo ai;
  725. dvd_struct dvds;
  726. int result = 0;
  727. int i, rv, tries, agid;
  729. memset(&ai, 0, sizeof (ai));
  730. memset(&dvds, 0, sizeof (dvds));
  732. if(get_asf(css)) return 1;
  734. /* Init sequence, request AGID */
  735. for(tries = 1, rv = -1; rv == -1 && tries < 4; tries++)
  736. {
  737. ai.type = DVD_LU_SEND_AGID;
  738. ai.lsa.agid = 0;
  739. rv = ioctl(css->fd, DVD_AUTH, &ai);
  740. if(rv == -1)
  741. {
  742. /* perror("validate: request AGID"); */
  743. ai.type = DVD_INVALIDATE_AGID;
  744. ai.lsa.agid = 0;
  745. ioctl(css->fd, DVD_AUTH, &ai);
  746. }
  747. }
  748. if(tries >= 4) return 1;
  750. for(i = 0; i < 10; i++) css->challenge[i] = i;
  752. /* Send AGID to host */
  753. if(hostauth(css, &ai)) return 1;
  755. /* Get challenge from host */
  756. if(hostauth(css, &ai)) return 1;
  757. agid = ai.lsa.agid;
  759. /* Send challenge to LU */
  760. if(ioctl(css->fd, DVD_AUTH, &ai) < 0) return 1;
  762. /* Get key1 from LU */
  763. if(ioctl(css->fd, DVD_AUTH, &ai) < 0) return 1;
  765. /* Send key1 to host */
  766. if(hostauth(css, &ai)) return 1;
  768. /* Get challenge from LU */
  769. if(ioctl(css->fd, DVD_AUTH, &ai) < 0) return 1;
  771. /* Send challenge to host */
  772. if(hostauth(css, &ai)) return 1;
  774. /* Get key2 from host */
  775. if(hostauth(css, &ai)) return 1;
  777. /* Send key2 to LU */
  778. if(ioctl(css->fd, DVD_AUTH, &ai) < 0) 
  779. {
  780. perror("validate: Send key2 to LU");
  781. return 1;
  782. }
  784. if(ai.type == DVD_AUTH_FAILURE)
  785. {
  786. fprintf(stderr, "validate: authorization failedn");
  787. return 1;
  788. }
  789. memcpy(css->challenge, css->key1.b, 5);
  790. memcpy(css->challenge + 5, css->key2.b, 5);
  791. crypt_bus_key(css, css->varient, css->challenge, &(css->keycheck));
  793. get_asf(css);
  795. if(do_title)
  796. return get_title_key(css, agid, lba, css->keycheck.b);
  797. else
  798. return get_disk_key(css, agid, css->keycheck.b);
  800. return 0;
  801. }
  803. static int validate_path(mpeg3_css_t *css, int do_title)
  804. {
  805. int result = 0;
  806. int lba = 0, file_fd;
  808. if(do_title)
  809. {
  810. if((file_fd = open(css->path, O_RDONLY)) == -1)
  811. {
  812. perror("validate_path: open");
  813. return 1;
  814. }
  816. if(ioctl(file_fd, FIBMAP, &lba) != 0)
  817. {
  818. perror("validate_path: FIBMAP");
  819. close(file_fd);
  820. return 1;
  821. }
  823. close(file_fd);
  824. }
  826. result = mpeg3io_device(css->path, css->device_path);
  828. //printf("validate_path 1 %dn", result);
  829. if(!result) result = (css->fd = open(css->device_path, O_RDONLY | O_NONBLOCK)) < 0;
  830. //printf("validate_path 2 %dn", result);
  832. if(!result) result = validate(css, lba, do_title);
  834. //printf("validate_path 3 %dn", result);
  835. /* Definitely encrypted if we got here. */
  838. if(!result) css->encrypted = 1;
  840. close(css->fd);
  841. return result;
  842. }
  844. /*
  845.  *
  846.  * this function is only used internally when decrypting title key
  847.  *
  848.  */
  849. static void title_key(unsigned char *key, unsigned char *im, unsigned char invert)
  850. {
  851. unsigned int lfsr1_lo, lfsr1_hi, lfsr0, combined;
  852. unsigned char o_lfsr0, o_lfsr1;
  853. unsigned char k[5];
  854. int i;
  856. lfsr1_lo = im[0] | 0x100;
  857. lfsr1_hi = im[1];
  859. lfsr0 = ((im[4] << 17) | (im[3] << 9) | (im[2] << 1)) + 8 - (im[2]&7);
  860. lfsr0 = (bit_reverse[lfsr0 & 0xff] << 24) | (bit_reverse[(lfsr0 >> 8) & 0xff] << 16)
  861.   | (bit_reverse[(lfsr0 >> 16) & 0xff] << 8) | bit_reverse[(lfsr0 >> 24) & 0xff];
  863. combined = 0;
  864. for (i = 0; i < 5; ++i) {
  865. o_lfsr1 = lfsr1_bits0[lfsr1_hi] ^ lfsr1_bits1[lfsr1_lo];
  866.   lfsr1_hi = lfsr1_lo>>1;
  867.   lfsr1_lo = ((lfsr1_lo&1)<<8) ^ o_lfsr1;
  868. o_lfsr1 = bit_reverse[o_lfsr1];
  870. /*o_lfsr0 = (lfsr0>>7)^(lfsr0>>10)^(lfsr0>>11)^(lfsr0>>19);*/
  871. o_lfsr0 = (((((((lfsr0>>8)^lfsr0)>>1)^lfsr0)>>3)^lfsr0)>>7);
  872.   lfsr0 = (lfsr0>>8)|(o_lfsr0<<24);
  874. combined += (o_lfsr0 ^ invert) + o_lfsr1;
  875. k[i] = combined & 0xff;
  876. combined >>= 8;
  877. }
  879. key[4] = k[4] ^ csstab1[key[4]] ^ key[3];
  880. key[3] = k[3] ^ csstab1[key[3]] ^ key[2];
  881. key[2] = k[2] ^ csstab1[key[2]] ^ key[1];
  882. key[1] = k[1] ^ csstab1[key[1]] ^ key[0];
  883. key[0] = k[0] ^ csstab1[key[0]] ^ key[4];
  885. key[4] = k[4] ^ csstab1[key[4]] ^ key[3];
  886. key[3] = k[3] ^ csstab1[key[3]] ^ key[2];
  887. key[2] = k[2] ^ csstab1[key[2]] ^ key[1];
  888. key[1] = k[1] ^ csstab1[key[1]] ^ key[0];
  889. key[0] = k[0] ^ csstab1[key[0]];
  890. }
  892. /*
  893.  *
  894.  * this function decrypts a title key with the specified disk key
  895.  *
  896.  * tkey: the unobfuscated title key (XORed with BusKey)
  897.  * dkey: the unobfuscated disk key (XORed with BusKey)
  898.  *       2048 bytes in length (though only 5 bytes are needed, see below)
  899.  *
  900.  * use the result returned in tkey with css_descramble
  901.  *
  902.  */
  904. static int decrypt_title_key(mpeg3_css_t *css, unsigned char *dkey, unsigned char *tkey)
  905. {
  906. unsigned char test[5], pretkey[5];
  907. int i = 0;
  909. for(i = 0; mpeg3_playkeys[i]; i++)
  910. {
  911. memcpy(pretkey, dkey + mpeg3_playkeys[i]->offset, 5);
  912. title_key(pretkey, mpeg3_playkeys[i]->key, 0);
  914. memcpy(test, dkey, 5);
  915. title_key(test, pretkey, 0);
  917. if(memcmp(test, pretkey, 5) == 0)
  918. break;
  919. }
  921. if(!mpeg3_playkeys[i])
  922. {
  923. fprintf(stderr, "mpeg3_decrypttitlekey: Shit - Need key %dn", i + 1);
  924. return 1;
  925. }
  927. title_key(css->title_key, pretkey, 0xff);
  929. return 0;
  930. }
  932. /*
  933.  *
  934.  * The descrambling core
  935.  *
  936.  * sec: encrypted sector (2048 bytes)
  937.  * key: decrypted title key obtained from css_decrypttitlekey
  938.  *
  939.  */
  941. #define SALTED(i) (key[i] ^ sec[0x54 - offset + (i)])
  943. static void descramble(unsigned char *sec, unsigned char *key, int offset)
  944. {
  945. unsigned int lfsr1_lo, lfsr1_hi, lfsr0, combined;
  946. unsigned char o_lfsr0, o_lfsr1;
  947. unsigned char *end = sec + 0x800 - offset;
  949. if(offset > 0x54)
  950. fprintf(stderr, "mpeg3css.c: descramble: offset > 0x54n");
  952. lfsr1_lo = SALTED(0) | 0x100;
  953. lfsr1_hi = SALTED(1);
  955. lfsr0 = ((SALTED(4) << 17) | (SALTED(3) << 9) | (SALTED(2) << 1)) + 8 - (SALTED(2) & 7);
  956. lfsr0 = (bit_reverse[lfsr0 & 0xff] << 24) | (bit_reverse[(lfsr0 >> 8) & 0xff] << 16)
  957.   | (bit_reverse[(lfsr0 >> 16) & 0xff] << 8) | bit_reverse[(lfsr0 >> 24) & 0xff];
  959. sec += 0x80 - offset;
  960. combined = 0;
  961. while(sec != end)
  962. {
  963. o_lfsr1 = lfsr1_bits0[lfsr1_hi] ^ lfsr1_bits1[lfsr1_lo];
  964.   lfsr1_hi = lfsr1_lo >> 1;
  965.   lfsr1_lo = ((lfsr1_lo&1) << 8) ^ o_lfsr1;
  966. o_lfsr1 = bit_reverse[o_lfsr1];
  968. /*o_lfsr0 = (lfsr0 >> 7) ^ (lfsr0 >> 10) ^ (lfsr0 >> 11) ^ (lfsr0 >> 19);*/
  969. o_lfsr0 = (((((((lfsr0 >> 8) ^ lfsr0) >> 1) ^ lfsr0) >> 3) ^ lfsr0) >> 7);
  970.   lfsr0 = (lfsr0 >> 8) | (o_lfsr0 << 24);
  972. combined += o_lfsr0 + (unsigned char)~o_lfsr1;
  974. *sec = csstab1[*sec] ^ (combined & 0xff);
  975. sec++;
  977. combined >>= 8;
  978. }
  979. //printf("descramblen");
  980. }
  982. /* =============================== Entry Points ================================= */
  984. mpeg3_css_t* mpeg3_new_css()
  985. {
  986. mpeg3_css_t *css = calloc(1, sizeof(mpeg3_css_t));
  987. css->varient = -1;
  988. return css;
  989. }
  991. int mpeg3_delete_css(mpeg3_css_t *css)
  992. {
  993. free(css);
  994. return 0;
  995. }
  997. int mpeg3_get_keys(mpeg3_css_t *css, char *path)
  998. {
  999. int result = 0;
  1001. strcpy(css->path, path);
  1002. /* Get disk key */
  1003. result = validate_path(css, 0);
  1004. /* Get title key */
  1005. if(!result) result = validate_path(css, 1);
  1006. /* Descramble the title key */
  1007. if(!result) result = decrypt_title_key(css, css->disk_key, css->title_key);
  1009. return css->encrypted ? result : 0;
  1010. }
  1012. /* sector is the full 2048 byte sector */
  1013. int mpeg3_decrypt_packet(mpeg3_css_t *css, unsigned char *sector, int offset)
  1014. {
  1015. //printf("mpeg3_decrypt_packet %dn", css->encrypted);
  1016. if(!css->encrypted) return 0;     /* Not encrypted */
  1017. descramble(sector, css->title_key, offset);
  1018. return 0;
  1019. }
  1021. #else // HAVE_CSS
  1023. #include "mpeg3css_fake.c"
  1025. #endif