aes.c 21 KB

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  1. /*
  2. * Copyright (c) 2011 The Chromium OS Authors.
  3. * (C) Copyright 2011 NVIDIA Corporation www.nvidia.com
  4. *
  5. * See file CREDITS for list of people who contributed to this
  6. * project.
  7. *
  8. * This program is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of
  11. * the License, or (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. * MA 02111-1307 USA
  22. */
  23. /*
  24. * advanced encryption standard
  25. * author: karl malbrain, malbrain@yahoo.com
  26. *
  27. * This work, including the source code, documentation
  28. * and related data, is placed into the public domain.
  29. *
  30. * The orginal author is Karl Malbrain.
  31. *
  32. * THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY
  33. * OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF
  34. * MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE,
  35. * ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE
  36. * RESULTING FROM THE USE, MODIFICATION, OR
  37. * REDISTRIBUTION OF THIS SOFTWARE.
  38. */
  39. #include <common.h>
  40. #include "aes.h"
  41. /* forward s-box */
  42. static const u8 sbox[256] = {
  43. 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
  44. 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
  45. 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
  46. 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
  47. 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
  48. 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
  49. 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
  50. 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
  51. 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
  52. 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
  53. 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
  54. 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
  55. 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
  56. 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
  57. 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
  58. 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
  59. 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
  60. 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
  61. 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
  62. 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
  63. 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
  64. 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
  65. 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
  66. 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
  67. 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
  68. 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
  69. 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
  70. 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
  71. 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
  72. 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
  73. 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
  74. 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
  75. };
  76. /* inverse s-box */
  77. static const u8 inv_sbox[256] = {
  78. 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
  79. 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
  80. 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
  81. 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
  82. 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
  83. 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
  84. 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
  85. 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
  86. 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
  87. 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
  88. 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
  89. 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
  90. 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
  91. 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
  92. 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
  93. 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
  94. 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
  95. 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
  96. 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
  97. 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
  98. 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
  99. 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
  100. 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
  101. 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
  102. 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
  103. 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
  104. 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
  105. 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
  106. 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
  107. 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
  108. 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
  109. 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
  110. };
  111. /* combined Xtimes2[Sbox[]] */
  112. static const u8 x2_sbox[256] = {
  113. 0xc6, 0xf8, 0xee, 0xf6, 0xff, 0xd6, 0xde, 0x91,
  114. 0x60, 0x02, 0xce, 0x56, 0xe7, 0xb5, 0x4d, 0xec,
  115. 0x8f, 0x1f, 0x89, 0xfa, 0xef, 0xb2, 0x8e, 0xfb,
  116. 0x41, 0xb3, 0x5f, 0x45, 0x23, 0x53, 0xe4, 0x9b,
  117. 0x75, 0xe1, 0x3d, 0x4c, 0x6c, 0x7e, 0xf5, 0x83,
  118. 0x68, 0x51, 0xd1, 0xf9, 0xe2, 0xab, 0x62, 0x2a,
  119. 0x08, 0x95, 0x46, 0x9d, 0x30, 0x37, 0x0a, 0x2f,
  120. 0x0e, 0x24, 0x1b, 0xdf, 0xcd, 0x4e, 0x7f, 0xea,
  121. 0x12, 0x1d, 0x58, 0x34, 0x36, 0xdc, 0xb4, 0x5b,
  122. 0xa4, 0x76, 0xb7, 0x7d, 0x52, 0xdd, 0x5e, 0x13,
  123. 0xa6, 0xb9, 0x00, 0xc1, 0x40, 0xe3, 0x79, 0xb6,
  124. 0xd4, 0x8d, 0x67, 0x72, 0x94, 0x98, 0xb0, 0x85,
  125. 0xbb, 0xc5, 0x4f, 0xed, 0x86, 0x9a, 0x66, 0x11,
  126. 0x8a, 0xe9, 0x04, 0xfe, 0xa0, 0x78, 0x25, 0x4b,
  127. 0xa2, 0x5d, 0x80, 0x05, 0x3f, 0x21, 0x70, 0xf1,
  128. 0x63, 0x77, 0xaf, 0x42, 0x20, 0xe5, 0xfd, 0xbf,
  129. 0x81, 0x18, 0x26, 0xc3, 0xbe, 0x35, 0x88, 0x2e,
  130. 0x93, 0x55, 0xfc, 0x7a, 0xc8, 0xba, 0x32, 0xe6,
  131. 0xc0, 0x19, 0x9e, 0xa3, 0x44, 0x54, 0x3b, 0x0b,
  132. 0x8c, 0xc7, 0x6b, 0x28, 0xa7, 0xbc, 0x16, 0xad,
  133. 0xdb, 0x64, 0x74, 0x14, 0x92, 0x0c, 0x48, 0xb8,
  134. 0x9f, 0xbd, 0x43, 0xc4, 0x39, 0x31, 0xd3, 0xf2,
  135. 0xd5, 0x8b, 0x6e, 0xda, 0x01, 0xb1, 0x9c, 0x49,
  136. 0xd8, 0xac, 0xf3, 0xcf, 0xca, 0xf4, 0x47, 0x10,
  137. 0x6f, 0xf0, 0x4a, 0x5c, 0x38, 0x57, 0x73, 0x97,
  138. 0xcb, 0xa1, 0xe8, 0x3e, 0x96, 0x61, 0x0d, 0x0f,
  139. 0xe0, 0x7c, 0x71, 0xcc, 0x90, 0x06, 0xf7, 0x1c,
  140. 0xc2, 0x6a, 0xae, 0x69, 0x17, 0x99, 0x3a, 0x27,
  141. 0xd9, 0xeb, 0x2b, 0x22, 0xd2, 0xa9, 0x07, 0x33,
  142. 0x2d, 0x3c, 0x15, 0xc9, 0x87, 0xaa, 0x50, 0xa5,
  143. 0x03, 0x59, 0x09, 0x1a, 0x65, 0xd7, 0x84, 0xd0,
  144. 0x82, 0x29, 0x5a, 0x1e, 0x7b, 0xa8, 0x6d, 0x2c
  145. };
  146. /* combined Xtimes3[Sbox[]] */
  147. static const u8 x3_sbox[256] = {
  148. 0xa5, 0x84, 0x99, 0x8d, 0x0d, 0xbd, 0xb1, 0x54,
  149. 0x50, 0x03, 0xa9, 0x7d, 0x19, 0x62, 0xe6, 0x9a,
  150. 0x45, 0x9d, 0x40, 0x87, 0x15, 0xeb, 0xc9, 0x0b,
  151. 0xec, 0x67, 0xfd, 0xea, 0xbf, 0xf7, 0x96, 0x5b,
  152. 0xc2, 0x1c, 0xae, 0x6a, 0x5a, 0x41, 0x02, 0x4f,
  153. 0x5c, 0xf4, 0x34, 0x08, 0x93, 0x73, 0x53, 0x3f,
  154. 0x0c, 0x52, 0x65, 0x5e, 0x28, 0xa1, 0x0f, 0xb5,
  155. 0x09, 0x36, 0x9b, 0x3d, 0x26, 0x69, 0xcd, 0x9f,
  156. 0x1b, 0x9e, 0x74, 0x2e, 0x2d, 0xb2, 0xee, 0xfb,
  157. 0xf6, 0x4d, 0x61, 0xce, 0x7b, 0x3e, 0x71, 0x97,
  158. 0xf5, 0x68, 0x00, 0x2c, 0x60, 0x1f, 0xc8, 0xed,
  159. 0xbe, 0x46, 0xd9, 0x4b, 0xde, 0xd4, 0xe8, 0x4a,
  160. 0x6b, 0x2a, 0xe5, 0x16, 0xc5, 0xd7, 0x55, 0x94,
  161. 0xcf, 0x10, 0x06, 0x81, 0xf0, 0x44, 0xba, 0xe3,
  162. 0xf3, 0xfe, 0xc0, 0x8a, 0xad, 0xbc, 0x48, 0x04,
  163. 0xdf, 0xc1, 0x75, 0x63, 0x30, 0x1a, 0x0e, 0x6d,
  164. 0x4c, 0x14, 0x35, 0x2f, 0xe1, 0xa2, 0xcc, 0x39,
  165. 0x57, 0xf2, 0x82, 0x47, 0xac, 0xe7, 0x2b, 0x95,
  166. 0xa0, 0x98, 0xd1, 0x7f, 0x66, 0x7e, 0xab, 0x83,
  167. 0xca, 0x29, 0xd3, 0x3c, 0x79, 0xe2, 0x1d, 0x76,
  168. 0x3b, 0x56, 0x4e, 0x1e, 0xdb, 0x0a, 0x6c, 0xe4,
  169. 0x5d, 0x6e, 0xef, 0xa6, 0xa8, 0xa4, 0x37, 0x8b,
  170. 0x32, 0x43, 0x59, 0xb7, 0x8c, 0x64, 0xd2, 0xe0,
  171. 0xb4, 0xfa, 0x07, 0x25, 0xaf, 0x8e, 0xe9, 0x18,
  172. 0xd5, 0x88, 0x6f, 0x72, 0x24, 0xf1, 0xc7, 0x51,
  173. 0x23, 0x7c, 0x9c, 0x21, 0xdd, 0xdc, 0x86, 0x85,
  174. 0x90, 0x42, 0xc4, 0xaa, 0xd8, 0x05, 0x01, 0x12,
  175. 0xa3, 0x5f, 0xf9, 0xd0, 0x91, 0x58, 0x27, 0xb9,
  176. 0x38, 0x13, 0xb3, 0x33, 0xbb, 0x70, 0x89, 0xa7,
  177. 0xb6, 0x22, 0x92, 0x20, 0x49, 0xff, 0x78, 0x7a,
  178. 0x8f, 0xf8, 0x80, 0x17, 0xda, 0x31, 0xc6, 0xb8,
  179. 0xc3, 0xb0, 0x77, 0x11, 0xcb, 0xfc, 0xd6, 0x3a
  180. };
  181. /*
  182. * modular multiplication tables based on:
  183. *
  184. * Xtime2[x] = (x & 0x80 ? 0x1b : 0) ^ (x + x)
  185. * Xtime3[x] = x^Xtime2[x];
  186. */
  187. static const u8 x_time_9[256] = {
  188. 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
  189. 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
  190. 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf,
  191. 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7,
  192. 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
  193. 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
  194. 0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94,
  195. 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc,
  196. 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49,
  197. 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01,
  198. 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9,
  199. 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91,
  200. 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72,
  201. 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a,
  202. 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2,
  203. 0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa,
  204. 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3,
  205. 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b,
  206. 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43,
  207. 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b,
  208. 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8,
  209. 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0,
  210. 0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78,
  211. 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30,
  212. 0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5,
  213. 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed,
  214. 0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35,
  215. 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d,
  216. 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e,
  217. 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6,
  218. 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e,
  219. 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46
  220. };
  221. static const u8 x_time_b[256] = {
  222. 0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31,
  223. 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69,
  224. 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81,
  225. 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9,
  226. 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a,
  227. 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12,
  228. 0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa,
  229. 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2,
  230. 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7,
  231. 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f,
  232. 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77,
  233. 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f,
  234. 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc,
  235. 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4,
  236. 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c,
  237. 0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54,
  238. 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6,
  239. 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e,
  240. 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76,
  241. 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e,
  242. 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd,
  243. 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5,
  244. 0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d,
  245. 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55,
  246. 0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30,
  247. 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68,
  248. 0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80,
  249. 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8,
  250. 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b,
  251. 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13,
  252. 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb,
  253. 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3
  254. };
  255. static const u8 x_time_d[256] = {
  256. 0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23,
  257. 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b,
  258. 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3,
  259. 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b,
  260. 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98,
  261. 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0,
  262. 0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48,
  263. 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20,
  264. 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e,
  265. 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26,
  266. 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e,
  267. 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6,
  268. 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5,
  269. 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d,
  270. 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25,
  271. 0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d,
  272. 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9,
  273. 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91,
  274. 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29,
  275. 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41,
  276. 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42,
  277. 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a,
  278. 0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92,
  279. 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa,
  280. 0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94,
  281. 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc,
  282. 0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44,
  283. 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c,
  284. 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f,
  285. 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47,
  286. 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff,
  287. 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97
  288. };
  289. static const u8 x_time_e[256] = {
  290. 0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a,
  291. 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a,
  292. 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca,
  293. 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba,
  294. 0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1,
  295. 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81,
  296. 0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11,
  297. 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61,
  298. 0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87,
  299. 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7,
  300. 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67,
  301. 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17,
  302. 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c,
  303. 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c,
  304. 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc,
  305. 0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc,
  306. 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b,
  307. 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b,
  308. 0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b,
  309. 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb,
  310. 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0,
  311. 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0,
  312. 0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50,
  313. 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20,
  314. 0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6,
  315. 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6,
  316. 0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26,
  317. 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56,
  318. 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d,
  319. 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d,
  320. 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd,
  321. 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d
  322. };
  323. /*
  324. * Exchanges columns in each of 4 rows
  325. * row0 - unchanged, row1- shifted left 1,
  326. * row2 - shifted left 2 and row3 - shifted left 3
  327. */
  328. static void shift_rows(u8 *state)
  329. {
  330. u8 tmp;
  331. /* just substitute row 0 */
  332. state[0] = sbox[state[0]];
  333. state[4] = sbox[state[4]];
  334. state[8] = sbox[state[8]];
  335. state[12] = sbox[state[12]];
  336. /* rotate row 1 */
  337. tmp = sbox[state[1]];
  338. state[1] = sbox[state[5]];
  339. state[5] = sbox[state[9]];
  340. state[9] = sbox[state[13]];
  341. state[13] = tmp;
  342. /* rotate row 2 */
  343. tmp = sbox[state[2]];
  344. state[2] = sbox[state[10]];
  345. state[10] = tmp;
  346. tmp = sbox[state[6]];
  347. state[6] = sbox[state[14]];
  348. state[14] = tmp;
  349. /* rotate row 3 */
  350. tmp = sbox[state[15]];
  351. state[15] = sbox[state[11]];
  352. state[11] = sbox[state[7]];
  353. state[7] = sbox[state[3]];
  354. state[3] = tmp;
  355. }
  356. /*
  357. * restores columns in each of 4 rows
  358. * row0 - unchanged, row1- shifted right 1,
  359. * row2 - shifted right 2 and row3 - shifted right 3
  360. */
  361. static void inv_shift_rows(u8 *state)
  362. {
  363. u8 tmp;
  364. /* restore row 0 */
  365. state[0] = inv_sbox[state[0]];
  366. state[4] = inv_sbox[state[4]];
  367. state[8] = inv_sbox[state[8]];
  368. state[12] = inv_sbox[state[12]];
  369. /* restore row 1 */
  370. tmp = inv_sbox[state[13]];
  371. state[13] = inv_sbox[state[9]];
  372. state[9] = inv_sbox[state[5]];
  373. state[5] = inv_sbox[state[1]];
  374. state[1] = tmp;
  375. /* restore row 2 */
  376. tmp = inv_sbox[state[2]];
  377. state[2] = inv_sbox[state[10]];
  378. state[10] = tmp;
  379. tmp = inv_sbox[state[6]];
  380. state[6] = inv_sbox[state[14]];
  381. state[14] = tmp;
  382. /* restore row 3 */
  383. tmp = inv_sbox[state[3]];
  384. state[3] = inv_sbox[state[7]];
  385. state[7] = inv_sbox[state[11]];
  386. state[11] = inv_sbox[state[15]];
  387. state[15] = tmp;
  388. }
  389. /* recombine and mix each row in a column */
  390. static void mix_sub_columns(u8 *state)
  391. {
  392. u8 tmp[4 * AES_STATECOLS];
  393. /* mixing column 0 */
  394. tmp[0] = x2_sbox[state[0]] ^ x3_sbox[state[5]] ^
  395. sbox[state[10]] ^ sbox[state[15]];
  396. tmp[1] = sbox[state[0]] ^ x2_sbox[state[5]] ^
  397. x3_sbox[state[10]] ^ sbox[state[15]];
  398. tmp[2] = sbox[state[0]] ^ sbox[state[5]] ^
  399. x2_sbox[state[10]] ^ x3_sbox[state[15]];
  400. tmp[3] = x3_sbox[state[0]] ^ sbox[state[5]] ^
  401. sbox[state[10]] ^ x2_sbox[state[15]];
  402. /* mixing column 1 */
  403. tmp[4] = x2_sbox[state[4]] ^ x3_sbox[state[9]] ^
  404. sbox[state[14]] ^ sbox[state[3]];
  405. tmp[5] = sbox[state[4]] ^ x2_sbox[state[9]] ^
  406. x3_sbox[state[14]] ^ sbox[state[3]];
  407. tmp[6] = sbox[state[4]] ^ sbox[state[9]] ^
  408. x2_sbox[state[14]] ^ x3_sbox[state[3]];
  409. tmp[7] = x3_sbox[state[4]] ^ sbox[state[9]] ^
  410. sbox[state[14]] ^ x2_sbox[state[3]];
  411. /* mixing column 2 */
  412. tmp[8] = x2_sbox[state[8]] ^ x3_sbox[state[13]] ^
  413. sbox[state[2]] ^ sbox[state[7]];
  414. tmp[9] = sbox[state[8]] ^ x2_sbox[state[13]] ^
  415. x3_sbox[state[2]] ^ sbox[state[7]];
  416. tmp[10] = sbox[state[8]] ^ sbox[state[13]] ^
  417. x2_sbox[state[2]] ^ x3_sbox[state[7]];
  418. tmp[11] = x3_sbox[state[8]] ^ sbox[state[13]] ^
  419. sbox[state[2]] ^ x2_sbox[state[7]];
  420. /* mixing column 3 */
  421. tmp[12] = x2_sbox[state[12]] ^ x3_sbox[state[1]] ^
  422. sbox[state[6]] ^ sbox[state[11]];
  423. tmp[13] = sbox[state[12]] ^ x2_sbox[state[1]] ^
  424. x3_sbox[state[6]] ^ sbox[state[11]];
  425. tmp[14] = sbox[state[12]] ^ sbox[state[1]] ^
  426. x2_sbox[state[6]] ^ x3_sbox[state[11]];
  427. tmp[15] = x3_sbox[state[12]] ^ sbox[state[1]] ^
  428. sbox[state[6]] ^ x2_sbox[state[11]];
  429. memcpy(state, tmp, sizeof(tmp));
  430. }
  431. /* restore and un-mix each row in a column */
  432. static void inv_mix_sub_columns(u8 *state)
  433. {
  434. u8 tmp[4 * AES_STATECOLS];
  435. int i;
  436. /* restore column 0 */
  437. tmp[0] = x_time_e[state[0]] ^ x_time_b[state[1]] ^
  438. x_time_d[state[2]] ^ x_time_9[state[3]];
  439. tmp[5] = x_time_9[state[0]] ^ x_time_e[state[1]] ^
  440. x_time_b[state[2]] ^ x_time_d[state[3]];
  441. tmp[10] = x_time_d[state[0]] ^ x_time_9[state[1]] ^
  442. x_time_e[state[2]] ^ x_time_b[state[3]];
  443. tmp[15] = x_time_b[state[0]] ^ x_time_d[state[1]] ^
  444. x_time_9[state[2]] ^ x_time_e[state[3]];
  445. /* restore column 1 */
  446. tmp[4] = x_time_e[state[4]] ^ x_time_b[state[5]] ^
  447. x_time_d[state[6]] ^ x_time_9[state[7]];
  448. tmp[9] = x_time_9[state[4]] ^ x_time_e[state[5]] ^
  449. x_time_b[state[6]] ^ x_time_d[state[7]];
  450. tmp[14] = x_time_d[state[4]] ^ x_time_9[state[5]] ^
  451. x_time_e[state[6]] ^ x_time_b[state[7]];
  452. tmp[3] = x_time_b[state[4]] ^ x_time_d[state[5]] ^
  453. x_time_9[state[6]] ^ x_time_e[state[7]];
  454. /* restore column 2 */
  455. tmp[8] = x_time_e[state[8]] ^ x_time_b[state[9]] ^
  456. x_time_d[state[10]] ^ x_time_9[state[11]];
  457. tmp[13] = x_time_9[state[8]] ^ x_time_e[state[9]] ^
  458. x_time_b[state[10]] ^ x_time_d[state[11]];
  459. tmp[2] = x_time_d[state[8]] ^ x_time_9[state[9]] ^
  460. x_time_e[state[10]] ^ x_time_b[state[11]];
  461. tmp[7] = x_time_b[state[8]] ^ x_time_d[state[9]] ^
  462. x_time_9[state[10]] ^ x_time_e[state[11]];
  463. /* restore column 3 */
  464. tmp[12] = x_time_e[state[12]] ^ x_time_b[state[13]] ^
  465. x_time_d[state[14]] ^ x_time_9[state[15]];
  466. tmp[1] = x_time_9[state[12]] ^ x_time_e[state[13]] ^
  467. x_time_b[state[14]] ^ x_time_d[state[15]];
  468. tmp[6] = x_time_d[state[12]] ^ x_time_9[state[13]] ^
  469. x_time_e[state[14]] ^ x_time_b[state[15]];
  470. tmp[11] = x_time_b[state[12]] ^ x_time_d[state[13]] ^
  471. x_time_9[state[14]] ^ x_time_e[state[15]];
  472. for (i = 0; i < 4 * AES_STATECOLS; i++)
  473. state[i] = inv_sbox[tmp[i]];
  474. }
  475. /*
  476. * encrypt/decrypt columns of the key
  477. * n.b. you can replace this with byte-wise xor if you wish.
  478. */
  479. static void add_round_key(u32 *state, u32 *key)
  480. {
  481. int idx;
  482. for (idx = 0; idx < 4; idx++)
  483. state[idx] ^= key[idx];
  484. }
  485. static u8 rcon[11] = {
  486. 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
  487. };
  488. /* produce AES_STATECOLS bytes for each round */
  489. void aes_expand_key(u8 *key, u8 *expkey)
  490. {
  491. u8 tmp0, tmp1, tmp2, tmp3, tmp4;
  492. u32 idx;
  493. memcpy(expkey, key, AES_KEYCOLS * 4);
  494. for (idx = AES_KEYCOLS; idx < AES_STATECOLS * (AES_ROUNDS + 1); idx++) {
  495. tmp0 = expkey[4*idx - 4];
  496. tmp1 = expkey[4*idx - 3];
  497. tmp2 = expkey[4*idx - 2];
  498. tmp3 = expkey[4*idx - 1];
  499. if (!(idx % AES_KEYCOLS)) {
  500. tmp4 = tmp3;
  501. tmp3 = sbox[tmp0];
  502. tmp0 = sbox[tmp1] ^ rcon[idx / AES_KEYCOLS];
  503. tmp1 = sbox[tmp2];
  504. tmp2 = sbox[tmp4];
  505. } else if ((AES_KEYCOLS > 6) && (idx % AES_KEYCOLS == 4)) {
  506. tmp0 = sbox[tmp0];
  507. tmp1 = sbox[tmp1];
  508. tmp2 = sbox[tmp2];
  509. tmp3 = sbox[tmp3];
  510. }
  511. expkey[4*idx+0] = expkey[4*idx - 4*AES_KEYCOLS + 0] ^ tmp0;
  512. expkey[4*idx+1] = expkey[4*idx - 4*AES_KEYCOLS + 1] ^ tmp1;
  513. expkey[4*idx+2] = expkey[4*idx - 4*AES_KEYCOLS + 2] ^ tmp2;
  514. expkey[4*idx+3] = expkey[4*idx - 4*AES_KEYCOLS + 3] ^ tmp3;
  515. }
  516. }
  517. /* encrypt one 128 bit block */
  518. void aes_encrypt(u8 *in, u8 *expkey, u8 *out)
  519. {
  520. u8 state[AES_STATECOLS * 4];
  521. u32 round;
  522. memcpy(state, in, AES_STATECOLS * 4);
  523. add_round_key((u32 *)state, (u32 *)expkey);
  524. for (round = 1; round < AES_ROUNDS + 1; round++) {
  525. if (round < AES_ROUNDS)
  526. mix_sub_columns(state);
  527. else
  528. shift_rows(state);
  529. add_round_key((u32 *)state,
  530. (u32 *)expkey + round * AES_STATECOLS);
  531. }
  532. memcpy(out, state, sizeof(state));
  533. }
  534. void aes_decrypt(u8 *in, u8 *expkey, u8 *out)
  535. {
  536. u8 state[AES_STATECOLS * 4];
  537. int round;
  538. memcpy(state, in, sizeof(state));
  539. add_round_key((u32 *)state,
  540. (u32 *)expkey + AES_ROUNDS * AES_STATECOLS);
  541. inv_shift_rows(state);
  542. for (round = AES_ROUNDS; round--; ) {
  543. add_round_key((u32 *)state,
  544. (u32 *)expkey + round * AES_STATECOLS);
  545. if (round)
  546. inv_mix_sub_columns(state);
  547. }
  548. memcpy(out, state, sizeof(state));
  549. }