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1.1 root 1: /*
2: ---------------------------------------------------------------------------
3: Copyright (c) 1998-2006, Brian Gladman, Worcester, UK. All rights reserved.
4:
5: LICENSE TERMS
6:
1.1.1.2 root 7: The free distribution and use of this software is allowed (with or without
8: changes) provided that:
1.1 root 9:
1.1.1.2 root 10: 1. source code distributions include the above copyright notice, this
11: list of conditions and the following disclaimer;
1.1 root 12:
1.1.1.2 root 13: 2. binary distributions include the above copyright notice, this list
14: of conditions and the following disclaimer in their documentation;
15:
16: 3. the name of the copyright holder is not used to endorse products
17: built using this software without specific written permission.
1.1 root 18:
19: DISCLAIMER
20:
21: This software is provided 'as is' with no explicit or implied warranties
22: in respect of its properties, including, but not limited to, correctness
23: and/or fitness for purpose.
24: ---------------------------------------------------------------------------
25: Issue 09/09/2006
26:
27: This is an AES implementation that uses only 8-bit byte operations on the
28: cipher state (there are options to use 32-bit types if available).
29:
30: The combination of mix columns and byte substitution used here is based on
31: that developed by Karl Malbrain. His contribution is acknowledged.
32: */
33:
1.1.1.4 ! root 34: /* Adapted for TrueCrypt:
1.1 root 35: - Macro-generated tables were replaced with static data to enable compiling
36: with MSVC++ 1.5 which runs out of resources when expanding large macros.
37: */
38:
1.1.1.2 root 39: #pragma optimize ("t", on)
40:
1.1 root 41: /* define if you have a fast memcpy function on your system */
42: #if 1
43: # define HAVE_MEMCPY
44: # include <string.h>
45: # if defined( _MSC_VER )
46: # ifndef DEBUG
47: # pragma intrinsic( memcpy )
48: # endif
49: # endif
50: #endif
51:
52: /* define if you have fast 32-bit types on your system */
53: #if 1
54: # define HAVE_UINT_32T
55: #endif
56:
57: /* alternative versions (test for performance on your system) */
58: #if 0
59: # define VERSION_1
60: #endif
61:
62: #include "AesSmall.h"
63:
64: #define WPOLY 0x011b
65: #define DPOLY 0x008d
66: #define f1(x) (x)
67: #define f2(x) ((x<<1) ^ (((x>>7) & 1) * WPOLY))
68: #define f4(x) ((x<<2) ^ (((x>>6) & 1) * WPOLY) ^ (((x>>6) & 2) * WPOLY))
69: #define f8(x) ((x<<3) ^ (((x>>5) & 1) * WPOLY) ^ (((x>>5) & 2) * WPOLY) \
70: ^ (((x>>5) & 4) * WPOLY))
71: #define d2(x) (((x) >> 1) ^ ((x) & 1 ? DPOLY : 0))
72:
73: #define f3(x) (f2(x) ^ x)
74: #define f9(x) (f8(x) ^ x)
75: #define fb(x) (f8(x) ^ f2(x) ^ x)
76: #define fd(x) (f8(x) ^ f4(x) ^ x)
77: #define fe(x) (f8(x) ^ f4(x) ^ f2(x))
78:
79: static const uint_8t s_box[256] = {
80: 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,
81: 0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
82: 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,
83: 0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
84: 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,
85: 0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
86: 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,
87: 0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
88: 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,
89: 0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
90: 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,
91: 0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
92: 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,
93: 0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
94: 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,
95: 0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
96: 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,
97: 0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
98: 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,
99: 0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
100: 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,
101: 0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
102: 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,
103: 0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
104: 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,
105: 0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
106: 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,
107: 0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
108: 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,
109: 0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
110: 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,
111: 0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16
112: };
113:
114: static const uint_8t inv_s_box[256] = {
115: 0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,
116: 0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb,
117: 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,
118: 0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb,
119: 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,
120: 0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e,
121: 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,
122: 0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25,
123: 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,
124: 0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92,
125: 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,
126: 0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84,
127: 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,
128: 0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06,
129: 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,
130: 0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b,
131: 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,
132: 0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73,
133: 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,
134: 0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e,
135: 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,
136: 0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b,
137: 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,
138: 0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4,
139: 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,
140: 0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f,
141: 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,
142: 0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef,
143: 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,
144: 0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61,
145: 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,
146: 0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d
147: };
148:
149: static const uint_8t gfm2_s_box[256] = {
150: 0xc6,0xf8,0xee,0xf6,0xff,0xd6,0xde,0x91,
151: 0x60,0x02,0xce,0x56,0xe7,0xb5,0x4d,0xec,
152: 0x8f,0x1f,0x89,0xfa,0xef,0xb2,0x8e,0xfb,
153: 0x41,0xb3,0x5f,0x45,0x23,0x53,0xe4,0x9b,
154: 0x75,0xe1,0x3d,0x4c,0x6c,0x7e,0xf5,0x83,
155: 0x68,0x51,0xd1,0xf9,0xe2,0xab,0x62,0x2a,
156: 0x08,0x95,0x46,0x9d,0x30,0x37,0x0a,0x2f,
157: 0x0e,0x24,0x1b,0xdf,0xcd,0x4e,0x7f,0xea,
158: 0x12,0x1d,0x58,0x34,0x36,0xdc,0xb4,0x5b,
159: 0xa4,0x76,0xb7,0x7d,0x52,0xdd,0x5e,0x13,
160: 0xa6,0xb9,0x00,0xc1,0x40,0xe3,0x79,0xb6,
161: 0xd4,0x8d,0x67,0x72,0x94,0x98,0xb0,0x85,
162: 0xbb,0xc5,0x4f,0xed,0x86,0x9a,0x66,0x11,
163: 0x8a,0xe9,0x04,0xfe,0xa0,0x78,0x25,0x4b,
164: 0xa2,0x5d,0x80,0x05,0x3f,0x21,0x70,0xf1,
165: 0x63,0x77,0xaf,0x42,0x20,0xe5,0xfd,0xbf,
166: 0x81,0x18,0x26,0xc3,0xbe,0x35,0x88,0x2e,
167: 0x93,0x55,0xfc,0x7a,0xc8,0xba,0x32,0xe6,
168: 0xc0,0x19,0x9e,0xa3,0x44,0x54,0x3b,0x0b,
169: 0x8c,0xc7,0x6b,0x28,0xa7,0xbc,0x16,0xad,
170: 0xdb,0x64,0x74,0x14,0x92,0x0c,0x48,0xb8,
171: 0x9f,0xbd,0x43,0xc4,0x39,0x31,0xd3,0xf2,
172: 0xd5,0x8b,0x6e,0xda,0x01,0xb1,0x9c,0x49,
173: 0xd8,0xac,0xf3,0xcf,0xca,0xf4,0x47,0x10,
174: 0x6f,0xf0,0x4a,0x5c,0x38,0x57,0x73,0x97,
175: 0xcb,0xa1,0xe8,0x3e,0x96,0x61,0x0d,0x0f,
176: 0xe0,0x7c,0x71,0xcc,0x90,0x06,0xf7,0x1c,
177: 0xc2,0x6a,0xae,0x69,0x17,0x99,0x3a,0x27,
178: 0xd9,0xeb,0x2b,0x22,0xd2,0xa9,0x07,0x33,
179: 0x2d,0x3c,0x15,0xc9,0x87,0xaa,0x50,0xa5,
180: 0x03,0x59,0x09,0x1a,0x65,0xd7,0x84,0xd0,
181: 0x82,0x29,0x5a,0x1e,0x7b,0xa8,0x6d,0x2c
182: };
183:
184: static const uint_8t gfm3_s_box[256] = {
185: 0xa5,0x84,0x99,0x8d,0x0d,0xbd,0xb1,0x54,
186: 0x50,0x03,0xa9,0x7d,0x19,0x62,0xe6,0x9a,
187: 0x45,0x9d,0x40,0x87,0x15,0xeb,0xc9,0x0b,
188: 0xec,0x67,0xfd,0xea,0xbf,0xf7,0x96,0x5b,
189: 0xc2,0x1c,0xae,0x6a,0x5a,0x41,0x02,0x4f,
190: 0x5c,0xf4,0x34,0x08,0x93,0x73,0x53,0x3f,
191: 0x0c,0x52,0x65,0x5e,0x28,0xa1,0x0f,0xb5,
192: 0x09,0x36,0x9b,0x3d,0x26,0x69,0xcd,0x9f,
193: 0x1b,0x9e,0x74,0x2e,0x2d,0xb2,0xee,0xfb,
194: 0xf6,0x4d,0x61,0xce,0x7b,0x3e,0x71,0x97,
195: 0xf5,0x68,0x00,0x2c,0x60,0x1f,0xc8,0xed,
196: 0xbe,0x46,0xd9,0x4b,0xde,0xd4,0xe8,0x4a,
197: 0x6b,0x2a,0xe5,0x16,0xc5,0xd7,0x55,0x94,
198: 0xcf,0x10,0x06,0x81,0xf0,0x44,0xba,0xe3,
199: 0xf3,0xfe,0xc0,0x8a,0xad,0xbc,0x48,0x04,
200: 0xdf,0xc1,0x75,0x63,0x30,0x1a,0x0e,0x6d,
201: 0x4c,0x14,0x35,0x2f,0xe1,0xa2,0xcc,0x39,
202: 0x57,0xf2,0x82,0x47,0xac,0xe7,0x2b,0x95,
203: 0xa0,0x98,0xd1,0x7f,0x66,0x7e,0xab,0x83,
204: 0xca,0x29,0xd3,0x3c,0x79,0xe2,0x1d,0x76,
205: 0x3b,0x56,0x4e,0x1e,0xdb,0x0a,0x6c,0xe4,
206: 0x5d,0x6e,0xef,0xa6,0xa8,0xa4,0x37,0x8b,
207: 0x32,0x43,0x59,0xb7,0x8c,0x64,0xd2,0xe0,
208: 0xb4,0xfa,0x07,0x25,0xaf,0x8e,0xe9,0x18,
209: 0xd5,0x88,0x6f,0x72,0x24,0xf1,0xc7,0x51,
210: 0x23,0x7c,0x9c,0x21,0xdd,0xdc,0x86,0x85,
211: 0x90,0x42,0xc4,0xaa,0xd8,0x05,0x01,0x12,
212: 0xa3,0x5f,0xf9,0xd0,0x91,0x58,0x27,0xb9,
213: 0x38,0x13,0xb3,0x33,0xbb,0x70,0x89,0xa7,
214: 0xb6,0x22,0x92,0x20,0x49,0xff,0x78,0x7a,
215: 0x8f,0xf8,0x80,0x17,0xda,0x31,0xc6,0xb8,
216: 0xc3,0xb0,0x77,0x11,0xcb,0xfc,0xd6,0x3a
217: };
218:
219: static const uint_8t gfmul_9[256] = {
220: 0x00,0x09,0x12,0x1b,0x24,0x2d,0x36,0x3f,
221: 0x48,0x41,0x5a,0x53,0x6c,0x65,0x7e,0x77,
222: 0x90,0x99,0x82,0x8b,0xb4,0xbd,0xa6,0xaf,
223: 0xd8,0xd1,0xca,0xc3,0xfc,0xf5,0xee,0xe7,
224: 0x3b,0x32,0x29,0x20,0x1f,0x16,0x0d,0x04,
225: 0x73,0x7a,0x61,0x68,0x57,0x5e,0x45,0x4c,
226: 0xab,0xa2,0xb9,0xb0,0x8f,0x86,0x9d,0x94,
227: 0xe3,0xea,0xf1,0xf8,0xc7,0xce,0xd5,0xdc,
228: 0x76,0x7f,0x64,0x6d,0x52,0x5b,0x40,0x49,
229: 0x3e,0x37,0x2c,0x25,0x1a,0x13,0x08,0x01,
230: 0xe6,0xef,0xf4,0xfd,0xc2,0xcb,0xd0,0xd9,
231: 0xae,0xa7,0xbc,0xb5,0x8a,0x83,0x98,0x91,
232: 0x4d,0x44,0x5f,0x56,0x69,0x60,0x7b,0x72,
233: 0x05,0x0c,0x17,0x1e,0x21,0x28,0x33,0x3a,
234: 0xdd,0xd4,0xcf,0xc6,0xf9,0xf0,0xeb,0xe2,
235: 0x95,0x9c,0x87,0x8e,0xb1,0xb8,0xa3,0xaa,
236: 0xec,0xe5,0xfe,0xf7,0xc8,0xc1,0xda,0xd3,
237: 0xa4,0xad,0xb6,0xbf,0x80,0x89,0x92,0x9b,
238: 0x7c,0x75,0x6e,0x67,0x58,0x51,0x4a,0x43,
239: 0x34,0x3d,0x26,0x2f,0x10,0x19,0x02,0x0b,
240: 0xd7,0xde,0xc5,0xcc,0xf3,0xfa,0xe1,0xe8,
241: 0x9f,0x96,0x8d,0x84,0xbb,0xb2,0xa9,0xa0,
242: 0x47,0x4e,0x55,0x5c,0x63,0x6a,0x71,0x78,
243: 0x0f,0x06,0x1d,0x14,0x2b,0x22,0x39,0x30,
244: 0x9a,0x93,0x88,0x81,0xbe,0xb7,0xac,0xa5,
245: 0xd2,0xdb,0xc0,0xc9,0xf6,0xff,0xe4,0xed,
246: 0x0a,0x03,0x18,0x11,0x2e,0x27,0x3c,0x35,
247: 0x42,0x4b,0x50,0x59,0x66,0x6f,0x74,0x7d,
248: 0xa1,0xa8,0xb3,0xba,0x85,0x8c,0x97,0x9e,
249: 0xe9,0xe0,0xfb,0xf2,0xcd,0xc4,0xdf,0xd6,
250: 0x31,0x38,0x23,0x2a,0x15,0x1c,0x07,0x0e,
251: 0x79,0x70,0x6b,0x62,0x5d,0x54,0x4f,0x46
252: };
253:
254: static const uint_8t gfmul_b[256] = {
255: 0x00,0x0b,0x16,0x1d,0x2c,0x27,0x3a,0x31,
256: 0x58,0x53,0x4e,0x45,0x74,0x7f,0x62,0x69,
257: 0xb0,0xbb,0xa6,0xad,0x9c,0x97,0x8a,0x81,
258: 0xe8,0xe3,0xfe,0xf5,0xc4,0xcf,0xd2,0xd9,
259: 0x7b,0x70,0x6d,0x66,0x57,0x5c,0x41,0x4a,
260: 0x23,0x28,0x35,0x3e,0x0f,0x04,0x19,0x12,
261: 0xcb,0xc0,0xdd,0xd6,0xe7,0xec,0xf1,0xfa,
262: 0x93,0x98,0x85,0x8e,0xbf,0xb4,0xa9,0xa2,
263: 0xf6,0xfd,0xe0,0xeb,0xda,0xd1,0xcc,0xc7,
264: 0xae,0xa5,0xb8,0xb3,0x82,0x89,0x94,0x9f,
265: 0x46,0x4d,0x50,0x5b,0x6a,0x61,0x7c,0x77,
266: 0x1e,0x15,0x08,0x03,0x32,0x39,0x24,0x2f,
267: 0x8d,0x86,0x9b,0x90,0xa1,0xaa,0xb7,0xbc,
268: 0xd5,0xde,0xc3,0xc8,0xf9,0xf2,0xef,0xe4,
269: 0x3d,0x36,0x2b,0x20,0x11,0x1a,0x07,0x0c,
270: 0x65,0x6e,0x73,0x78,0x49,0x42,0x5f,0x54,
271: 0xf7,0xfc,0xe1,0xea,0xdb,0xd0,0xcd,0xc6,
272: 0xaf,0xa4,0xb9,0xb2,0x83,0x88,0x95,0x9e,
273: 0x47,0x4c,0x51,0x5a,0x6b,0x60,0x7d,0x76,
274: 0x1f,0x14,0x09,0x02,0x33,0x38,0x25,0x2e,
275: 0x8c,0x87,0x9a,0x91,0xa0,0xab,0xb6,0xbd,
276: 0xd4,0xdf,0xc2,0xc9,0xf8,0xf3,0xee,0xe5,
277: 0x3c,0x37,0x2a,0x21,0x10,0x1b,0x06,0x0d,
278: 0x64,0x6f,0x72,0x79,0x48,0x43,0x5e,0x55,
279: 0x01,0x0a,0x17,0x1c,0x2d,0x26,0x3b,0x30,
280: 0x59,0x52,0x4f,0x44,0x75,0x7e,0x63,0x68,
281: 0xb1,0xba,0xa7,0xac,0x9d,0x96,0x8b,0x80,
282: 0xe9,0xe2,0xff,0xf4,0xc5,0xce,0xd3,0xd8,
283: 0x7a,0x71,0x6c,0x67,0x56,0x5d,0x40,0x4b,
284: 0x22,0x29,0x34,0x3f,0x0e,0x05,0x18,0x13,
285: 0xca,0xc1,0xdc,0xd7,0xe6,0xed,0xf0,0xfb,
286: 0x92,0x99,0x84,0x8f,0xbe,0xb5,0xa8,0xa3
287: };
288:
289: static const uint_8t gfmul_d[256] = {
290: 0x00,0x0d,0x1a,0x17,0x34,0x39,0x2e,0x23,
291: 0x68,0x65,0x72,0x7f,0x5c,0x51,0x46,0x4b,
292: 0xd0,0xdd,0xca,0xc7,0xe4,0xe9,0xfe,0xf3,
293: 0xb8,0xb5,0xa2,0xaf,0x8c,0x81,0x96,0x9b,
294: 0xbb,0xb6,0xa1,0xac,0x8f,0x82,0x95,0x98,
295: 0xd3,0xde,0xc9,0xc4,0xe7,0xea,0xfd,0xf0,
296: 0x6b,0x66,0x71,0x7c,0x5f,0x52,0x45,0x48,
297: 0x03,0x0e,0x19,0x14,0x37,0x3a,0x2d,0x20,
298: 0x6d,0x60,0x77,0x7a,0x59,0x54,0x43,0x4e,
299: 0x05,0x08,0x1f,0x12,0x31,0x3c,0x2b,0x26,
300: 0xbd,0xb0,0xa7,0xaa,0x89,0x84,0x93,0x9e,
301: 0xd5,0xd8,0xcf,0xc2,0xe1,0xec,0xfb,0xf6,
302: 0xd6,0xdb,0xcc,0xc1,0xe2,0xef,0xf8,0xf5,
303: 0xbe,0xb3,0xa4,0xa9,0x8a,0x87,0x90,0x9d,
304: 0x06,0x0b,0x1c,0x11,0x32,0x3f,0x28,0x25,
305: 0x6e,0x63,0x74,0x79,0x5a,0x57,0x40,0x4d,
306: 0xda,0xd7,0xc0,0xcd,0xee,0xe3,0xf4,0xf9,
307: 0xb2,0xbf,0xa8,0xa5,0x86,0x8b,0x9c,0x91,
308: 0x0a,0x07,0x10,0x1d,0x3e,0x33,0x24,0x29,
309: 0x62,0x6f,0x78,0x75,0x56,0x5b,0x4c,0x41,
310: 0x61,0x6c,0x7b,0x76,0x55,0x58,0x4f,0x42,
311: 0x09,0x04,0x13,0x1e,0x3d,0x30,0x27,0x2a,
312: 0xb1,0xbc,0xab,0xa6,0x85,0x88,0x9f,0x92,
313: 0xd9,0xd4,0xc3,0xce,0xed,0xe0,0xf7,0xfa,
314: 0xb7,0xba,0xad,0xa0,0x83,0x8e,0x99,0x94,
315: 0xdf,0xd2,0xc5,0xc8,0xeb,0xe6,0xf1,0xfc,
316: 0x67,0x6a,0x7d,0x70,0x53,0x5e,0x49,0x44,
317: 0x0f,0x02,0x15,0x18,0x3b,0x36,0x21,0x2c,
318: 0x0c,0x01,0x16,0x1b,0x38,0x35,0x22,0x2f,
319: 0x64,0x69,0x7e,0x73,0x50,0x5d,0x4a,0x47,
320: 0xdc,0xd1,0xc6,0xcb,0xe8,0xe5,0xf2,0xff,
321: 0xb4,0xb9,0xae,0xa3,0x80,0x8d,0x9a,0x97
322: };
323:
324: static const uint_8t gfmul_e[256] = {
325: 0x00,0x0e,0x1c,0x12,0x38,0x36,0x24,0x2a,
326: 0x70,0x7e,0x6c,0x62,0x48,0x46,0x54,0x5a,
327: 0xe0,0xee,0xfc,0xf2,0xd8,0xd6,0xc4,0xca,
328: 0x90,0x9e,0x8c,0x82,0xa8,0xa6,0xb4,0xba,
329: 0xdb,0xd5,0xc7,0xc9,0xe3,0xed,0xff,0xf1,
330: 0xab,0xa5,0xb7,0xb9,0x93,0x9d,0x8f,0x81,
331: 0x3b,0x35,0x27,0x29,0x03,0x0d,0x1f,0x11,
332: 0x4b,0x45,0x57,0x59,0x73,0x7d,0x6f,0x61,
333: 0xad,0xa3,0xb1,0xbf,0x95,0x9b,0x89,0x87,
334: 0xdd,0xd3,0xc1,0xcf,0xe5,0xeb,0xf9,0xf7,
335: 0x4d,0x43,0x51,0x5f,0x75,0x7b,0x69,0x67,
336: 0x3d,0x33,0x21,0x2f,0x05,0x0b,0x19,0x17,
337: 0x76,0x78,0x6a,0x64,0x4e,0x40,0x52,0x5c,
338: 0x06,0x08,0x1a,0x14,0x3e,0x30,0x22,0x2c,
339: 0x96,0x98,0x8a,0x84,0xae,0xa0,0xb2,0xbc,
340: 0xe6,0xe8,0xfa,0xf4,0xde,0xd0,0xc2,0xcc,
341: 0x41,0x4f,0x5d,0x53,0x79,0x77,0x65,0x6b,
342: 0x31,0x3f,0x2d,0x23,0x09,0x07,0x15,0x1b,
343: 0xa1,0xaf,0xbd,0xb3,0x99,0x97,0x85,0x8b,
344: 0xd1,0xdf,0xcd,0xc3,0xe9,0xe7,0xf5,0xfb,
345: 0x9a,0x94,0x86,0x88,0xa2,0xac,0xbe,0xb0,
346: 0xea,0xe4,0xf6,0xf8,0xd2,0xdc,0xce,0xc0,
347: 0x7a,0x74,0x66,0x68,0x42,0x4c,0x5e,0x50,
348: 0x0a,0x04,0x16,0x18,0x32,0x3c,0x2e,0x20,
349: 0xec,0xe2,0xf0,0xfe,0xd4,0xda,0xc8,0xc6,
350: 0x9c,0x92,0x80,0x8e,0xa4,0xaa,0xb8,0xb6,
351: 0x0c,0x02,0x10,0x1e,0x34,0x3a,0x28,0x26,
352: 0x7c,0x72,0x60,0x6e,0x44,0x4a,0x58,0x56,
353: 0x37,0x39,0x2b,0x25,0x0f,0x01,0x13,0x1d,
354: 0x47,0x49,0x5b,0x55,0x7f,0x71,0x63,0x6d,
355: 0xd7,0xd9,0xcb,0xc5,0xef,0xe1,0xf3,0xfd,
356: 0xa7,0xa9,0xbb,0xb5,0x9f,0x91,0x83,0x8d
357: };
358:
359: #if defined( HAVE_UINT_32T )
360: typedef unsigned long uint_32t;
361: #endif
362:
363: #if defined( HAVE_MEMCPY )
364: # define block_copy(d, s, l) memcpy(d, s, l)
365: # define block16_copy(d, s) memcpy(d, s, N_BLOCK)
366: #else
367: # define block_copy(d, s, l) copy_block(d, s, l)
368: # define block16_copy(d, s) copy_block16(d, s)
369: #endif
370:
371: /* block size 'nn' must be a multiple of four */
372:
373: static void copy_block16( void *d, const void *s )
374: {
375: #if defined( HAVE_UINT_32T )
376: ((uint_32t*)d)[ 0] = ((uint_32t*)s)[ 0];
377: ((uint_32t*)d)[ 1] = ((uint_32t*)s)[ 1];
378: ((uint_32t*)d)[ 2] = ((uint_32t*)s)[ 2];
379: ((uint_32t*)d)[ 3] = ((uint_32t*)s)[ 3];
380: #else
381: ((uint_8t*)d)[ 0] = ((uint_8t*)s)[ 0];
382: ((uint_8t*)d)[ 1] = ((uint_8t*)s)[ 1];
383: ((uint_8t*)d)[ 2] = ((uint_8t*)s)[ 2];
384: ((uint_8t*)d)[ 3] = ((uint_8t*)s)[ 3];
385: ((uint_8t*)d)[ 4] = ((uint_8t*)s)[ 4];
386: ((uint_8t*)d)[ 5] = ((uint_8t*)s)[ 5];
387: ((uint_8t*)d)[ 6] = ((uint_8t*)s)[ 6];
388: ((uint_8t*)d)[ 7] = ((uint_8t*)s)[ 7];
389: ((uint_8t*)d)[ 8] = ((uint_8t*)s)[ 8];
390: ((uint_8t*)d)[ 9] = ((uint_8t*)s)[ 9];
391: ((uint_8t*)d)[10] = ((uint_8t*)s)[10];
392: ((uint_8t*)d)[11] = ((uint_8t*)s)[11];
393: ((uint_8t*)d)[12] = ((uint_8t*)s)[12];
394: ((uint_8t*)d)[13] = ((uint_8t*)s)[13];
395: ((uint_8t*)d)[14] = ((uint_8t*)s)[14];
396: ((uint_8t*)d)[15] = ((uint_8t*)s)[15];
397: #endif
398: }
399:
400: static void copy_block( void * d, void *s, uint_8t nn )
401: {
402: while( nn-- )
403: *((uint_8t*)d)++ = *((uint_8t*)s)++;
404: }
405:
406: static void xor_block( void *d, const void *s )
407: {
408: #if defined( HAVE_UINT_32T )
409: ((uint_32t*)d)[ 0] ^= ((uint_32t*)s)[ 0];
410: ((uint_32t*)d)[ 1] ^= ((uint_32t*)s)[ 1];
411: ((uint_32t*)d)[ 2] ^= ((uint_32t*)s)[ 2];
412: ((uint_32t*)d)[ 3] ^= ((uint_32t*)s)[ 3];
413: #else
414: ((uint_8t*)d)[ 0] ^= ((uint_8t*)s)[ 0];
415: ((uint_8t*)d)[ 1] ^= ((uint_8t*)s)[ 1];
416: ((uint_8t*)d)[ 2] ^= ((uint_8t*)s)[ 2];
417: ((uint_8t*)d)[ 3] ^= ((uint_8t*)s)[ 3];
418: ((uint_8t*)d)[ 4] ^= ((uint_8t*)s)[ 4];
419: ((uint_8t*)d)[ 5] ^= ((uint_8t*)s)[ 5];
420: ((uint_8t*)d)[ 6] ^= ((uint_8t*)s)[ 6];
421: ((uint_8t*)d)[ 7] ^= ((uint_8t*)s)[ 7];
422: ((uint_8t*)d)[ 8] ^= ((uint_8t*)s)[ 8];
423: ((uint_8t*)d)[ 9] ^= ((uint_8t*)s)[ 9];
424: ((uint_8t*)d)[10] ^= ((uint_8t*)s)[10];
425: ((uint_8t*)d)[11] ^= ((uint_8t*)s)[11];
426: ((uint_8t*)d)[12] ^= ((uint_8t*)s)[12];
427: ((uint_8t*)d)[13] ^= ((uint_8t*)s)[13];
428: ((uint_8t*)d)[14] ^= ((uint_8t*)s)[14];
429: ((uint_8t*)d)[15] ^= ((uint_8t*)s)[15];
430: #endif
431: }
432:
433: static void copy_and_key( void *d, const void *s, const void *k )
434: {
435: #if defined( HAVE_UINT_32T )
436: ((uint_32t*)d)[ 0] = ((uint_32t*)s)[ 0] ^ ((uint_32t*)k)[ 0];
437: ((uint_32t*)d)[ 1] = ((uint_32t*)s)[ 1] ^ ((uint_32t*)k)[ 1];
438: ((uint_32t*)d)[ 2] = ((uint_32t*)s)[ 2] ^ ((uint_32t*)k)[ 2];
439: ((uint_32t*)d)[ 3] = ((uint_32t*)s)[ 3] ^ ((uint_32t*)k)[ 3];
440: #elif 1
441: ((uint_8t*)d)[ 0] = ((uint_8t*)s)[ 0] ^ ((uint_8t*)k)[ 0];
442: ((uint_8t*)d)[ 1] = ((uint_8t*)s)[ 1] ^ ((uint_8t*)k)[ 1];
443: ((uint_8t*)d)[ 2] = ((uint_8t*)s)[ 2] ^ ((uint_8t*)k)[ 2];
444: ((uint_8t*)d)[ 3] = ((uint_8t*)s)[ 3] ^ ((uint_8t*)k)[ 3];
445: ((uint_8t*)d)[ 4] = ((uint_8t*)s)[ 4] ^ ((uint_8t*)k)[ 4];
446: ((uint_8t*)d)[ 5] = ((uint_8t*)s)[ 5] ^ ((uint_8t*)k)[ 5];
447: ((uint_8t*)d)[ 6] = ((uint_8t*)s)[ 6] ^ ((uint_8t*)k)[ 6];
448: ((uint_8t*)d)[ 7] = ((uint_8t*)s)[ 7] ^ ((uint_8t*)k)[ 7];
449: ((uint_8t*)d)[ 8] = ((uint_8t*)s)[ 8] ^ ((uint_8t*)k)[ 8];
450: ((uint_8t*)d)[ 9] = ((uint_8t*)s)[ 9] ^ ((uint_8t*)k)[ 9];
451: ((uint_8t*)d)[10] = ((uint_8t*)s)[10] ^ ((uint_8t*)k)[10];
452: ((uint_8t*)d)[11] = ((uint_8t*)s)[11] ^ ((uint_8t*)k)[11];
453: ((uint_8t*)d)[12] = ((uint_8t*)s)[12] ^ ((uint_8t*)k)[12];
454: ((uint_8t*)d)[13] = ((uint_8t*)s)[13] ^ ((uint_8t*)k)[13];
455: ((uint_8t*)d)[14] = ((uint_8t*)s)[14] ^ ((uint_8t*)k)[14];
456: ((uint_8t*)d)[15] = ((uint_8t*)s)[15] ^ ((uint_8t*)k)[15];
457: #else
458: block16_copy(d, s);
459: xor_block(d, k);
460: #endif
461: }
462:
463: static void add_round_key( uint_8t d[N_BLOCK], const uint_8t k[N_BLOCK] )
464: {
465: xor_block(d, k);
466: }
467:
468: static void shift_sub_rows( uint_8t st[N_BLOCK] )
469: { uint_8t tt;
470:
471: st[ 0] = s_box[st[ 0]]; st[ 4] = s_box[st[ 4]];
472: st[ 8] = s_box[st[ 8]]; st[12] = s_box[st[12]];
473:
474: tt = st[1]; st[ 1] = s_box[st[ 5]]; st[ 5] = s_box[st[ 9]];
475: st[ 9] = s_box[st[13]]; st[13] = s_box[ tt ];
476:
477: tt = st[2]; st[ 2] = s_box[st[10]]; st[10] = s_box[ tt ];
478: tt = st[6]; st[ 6] = s_box[st[14]]; st[14] = s_box[ tt ];
479:
480: tt = st[15]; st[15] = s_box[st[11]]; st[11] = s_box[st[ 7]];
481: st[ 7] = s_box[st[ 3]]; st[ 3] = s_box[ tt ];
482: }
483:
484: static void inv_shift_sub_rows( uint_8t st[N_BLOCK] )
485: { uint_8t tt;
486:
487: st[ 0] = inv_s_box[st[ 0]]; st[ 4] = inv_s_box[st[ 4]];
488: st[ 8] = inv_s_box[st[ 8]]; st[12] = inv_s_box[st[12]];
489:
490: tt = st[13]; st[13] = inv_s_box[st[9]]; st[ 9] = inv_s_box[st[5]];
491: st[ 5] = inv_s_box[st[1]]; st[ 1] = inv_s_box[ tt ];
492:
493: tt = st[2]; st[ 2] = inv_s_box[st[10]]; st[10] = inv_s_box[ tt ];
494: tt = st[6]; st[ 6] = inv_s_box[st[14]]; st[14] = inv_s_box[ tt ];
495:
496: tt = st[3]; st[ 3] = inv_s_box[st[ 7]]; st[ 7] = inv_s_box[st[11]];
497: st[11] = inv_s_box[st[15]]; st[15] = inv_s_box[ tt ];
498: }
499:
500: #if defined( VERSION_1 )
501: static void mix_sub_columns( uint_8t dt[N_BLOCK] )
502: { uint_8t st[N_BLOCK];
503: block16_copy(st, dt);
504: #else
505: static void mix_sub_columns( uint_8t dt[N_BLOCK], uint_8t st[N_BLOCK] )
506: {
507: #endif
508: dt[ 0] = gfm2_s_box[st[0]] ^ gfm3_s_box[st[5]] ^ s_box[st[10]] ^ s_box[st[15]];
509: dt[ 1] = s_box[st[0]] ^ gfm2_s_box[st[5]] ^ gfm3_s_box[st[10]] ^ s_box[st[15]];
510: dt[ 2] = s_box[st[0]] ^ s_box[st[5]] ^ gfm2_s_box[st[10]] ^ gfm3_s_box[st[15]];
511: dt[ 3] = gfm3_s_box[st[0]] ^ s_box[st[5]] ^ s_box[st[10]] ^ gfm2_s_box[st[15]];
512:
513: dt[ 4] = gfm2_s_box[st[4]] ^ gfm3_s_box[st[9]] ^ s_box[st[14]] ^ s_box[st[3]];
514: dt[ 5] = s_box[st[4]] ^ gfm2_s_box[st[9]] ^ gfm3_s_box[st[14]] ^ s_box[st[3]];
515: dt[ 6] = s_box[st[4]] ^ s_box[st[9]] ^ gfm2_s_box[st[14]] ^ gfm3_s_box[st[3]];
516: dt[ 7] = gfm3_s_box[st[4]] ^ s_box[st[9]] ^ s_box[st[14]] ^ gfm2_s_box[st[3]];
517:
518: dt[ 8] = gfm2_s_box[st[8]] ^ gfm3_s_box[st[13]] ^ s_box[st[2]] ^ s_box[st[7]];
519: dt[ 9] = s_box[st[8]] ^ gfm2_s_box[st[13]] ^ gfm3_s_box[st[2]] ^ s_box[st[7]];
520: dt[10] = s_box[st[8]] ^ s_box[st[13]] ^ gfm2_s_box[st[2]] ^ gfm3_s_box[st[7]];
521: dt[11] = gfm3_s_box[st[8]] ^ s_box[st[13]] ^ s_box[st[2]] ^ gfm2_s_box[st[7]];
522:
523: dt[12] = gfm2_s_box[st[12]] ^ gfm3_s_box[st[1]] ^ s_box[st[6]] ^ s_box[st[11]];
524: dt[13] = s_box[st[12]] ^ gfm2_s_box[st[1]] ^ gfm3_s_box[st[6]] ^ s_box[st[11]];
525: dt[14] = s_box[st[12]] ^ s_box[st[1]] ^ gfm2_s_box[st[6]] ^ gfm3_s_box[st[11]];
526: dt[15] = gfm3_s_box[st[12]] ^ s_box[st[1]] ^ s_box[st[6]] ^ gfm2_s_box[st[11]];
527: }
528:
529: #if defined( VERSION_1 )
530: static void inv_mix_sub_columns( uint_8t dt[N_BLOCK] )
531: { uint_8t st[N_BLOCK];
532: block16_copy(st, dt);
533: #else
534: static void inv_mix_sub_columns( uint_8t dt[N_BLOCK], uint_8t st[N_BLOCK] )
535: {
536: #endif
537: dt[ 0] = inv_s_box[gfmul_e[st[ 0]] ^ gfmul_b[st[ 1]] ^ gfmul_d[st[ 2]] ^ gfmul_9[st[ 3]]];
538: dt[ 5] = inv_s_box[gfmul_9[st[ 0]] ^ gfmul_e[st[ 1]] ^ gfmul_b[st[ 2]] ^ gfmul_d[st[ 3]]];
539: dt[10] = inv_s_box[gfmul_d[st[ 0]] ^ gfmul_9[st[ 1]] ^ gfmul_e[st[ 2]] ^ gfmul_b[st[ 3]]];
540: dt[15] = inv_s_box[gfmul_b[st[ 0]] ^ gfmul_d[st[ 1]] ^ gfmul_9[st[ 2]] ^ gfmul_e[st[ 3]]];
541:
542: dt[ 4] = inv_s_box[gfmul_e[st[ 4]] ^ gfmul_b[st[ 5]] ^ gfmul_d[st[ 6]] ^ gfmul_9[st[ 7]]];
543: dt[ 9] = inv_s_box[gfmul_9[st[ 4]] ^ gfmul_e[st[ 5]] ^ gfmul_b[st[ 6]] ^ gfmul_d[st[ 7]]];
544: dt[14] = inv_s_box[gfmul_d[st[ 4]] ^ gfmul_9[st[ 5]] ^ gfmul_e[st[ 6]] ^ gfmul_b[st[ 7]]];
545: dt[ 3] = inv_s_box[gfmul_b[st[ 4]] ^ gfmul_d[st[ 5]] ^ gfmul_9[st[ 6]] ^ gfmul_e[st[ 7]]];
546:
547: dt[ 8] = inv_s_box[gfmul_e[st[ 8]] ^ gfmul_b[st[ 9]] ^ gfmul_d[st[10]] ^ gfmul_9[st[11]]];
548: dt[13] = inv_s_box[gfmul_9[st[ 8]] ^ gfmul_e[st[ 9]] ^ gfmul_b[st[10]] ^ gfmul_d[st[11]]];
549: dt[ 2] = inv_s_box[gfmul_d[st[ 8]] ^ gfmul_9[st[ 9]] ^ gfmul_e[st[10]] ^ gfmul_b[st[11]]];
550: dt[ 7] = inv_s_box[gfmul_b[st[ 8]] ^ gfmul_d[st[ 9]] ^ gfmul_9[st[10]] ^ gfmul_e[st[11]]];
551:
552: dt[12] = inv_s_box[gfmul_e[st[12]] ^ gfmul_b[st[13]] ^ gfmul_d[st[14]] ^ gfmul_9[st[15]]];
553: dt[ 1] = inv_s_box[gfmul_9[st[12]] ^ gfmul_e[st[13]] ^ gfmul_b[st[14]] ^ gfmul_d[st[15]]];
554: dt[ 6] = inv_s_box[gfmul_d[st[12]] ^ gfmul_9[st[13]] ^ gfmul_e[st[14]] ^ gfmul_b[st[15]]];
555: dt[11] = inv_s_box[gfmul_b[st[12]] ^ gfmul_d[st[13]] ^ gfmul_9[st[14]] ^ gfmul_e[st[15]]];
556: }
557:
558: #if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
559:
560: /* Set the cipher key for the pre-keyed version */
561:
562: return_type aes_set_key( const unsigned char key[], length_type keylen, aes_context ctx[1] )
563: {
564: uint_8t cc, rc, hi;
565:
566: switch( keylen )
567: {
568: case 16:
569: case 128:
570: keylen = 16;
571: break;
572: case 24:
573: case 192:
574: keylen = 24;
575: break;
576: case 32:
577: case 256:
578: keylen = 32;
579: break;
580: default:
581: ctx->rnd = 0;
1.1.1.3 root 582: return (return_type) -1;
1.1 root 583: }
584: block_copy(ctx->ksch, key, keylen);
585: hi = (keylen + 28) << 2;
586: ctx->rnd = (hi >> 4) - 1;
587: for( cc = keylen, rc = 1; cc < hi; cc += 4 )
588: { uint_8t tt, t0, t1, t2, t3;
589:
590: t0 = ctx->ksch[cc - 4];
591: t1 = ctx->ksch[cc - 3];
592: t2 = ctx->ksch[cc - 2];
593: t3 = ctx->ksch[cc - 1];
594: if( cc % keylen == 0 )
595: {
596: tt = t0;
597: t0 = s_box[t1] ^ rc;
598: t1 = s_box[t2];
599: t2 = s_box[t3];
600: t3 = s_box[tt];
601: rc = f2(rc);
602: }
603: else if( keylen > 24 && cc % keylen == 16 )
604: {
605: t0 = s_box[t0];
606: t1 = s_box[t1];
607: t2 = s_box[t2];
608: t3 = s_box[t3];
609: }
610: tt = cc - keylen;
611: ctx->ksch[cc + 0] = ctx->ksch[tt + 0] ^ t0;
612: ctx->ksch[cc + 1] = ctx->ksch[tt + 1] ^ t1;
613: ctx->ksch[cc + 2] = ctx->ksch[tt + 2] ^ t2;
614: ctx->ksch[cc + 3] = ctx->ksch[tt + 3] ^ t3;
615: }
616: return 0;
617: }
618:
619: #endif
620:
621: #if defined( AES_ENC_PREKEYED )
622:
623: /* Encrypt a single block of 16 bytes */
624:
625: return_type aes_encrypt( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const aes_context ctx[1] )
626: {
627: if( ctx->rnd )
628: {
629: uint_8t s1[N_BLOCK], r;
630: copy_and_key( s1, in, ctx->ksch );
631:
632: for( r = 1 ; r < ctx->rnd ; ++r )
633: #if defined( VERSION_1 )
634: {
635: mix_sub_columns( s1 );
636: add_round_key( s1, ctx->ksch + r * N_BLOCK);
637: }
638: #else
639: { uint_8t s2[N_BLOCK];
640: mix_sub_columns( s2, s1 );
641: copy_and_key( s1, s2, ctx->ksch + r * N_BLOCK);
642: }
643: #endif
644: shift_sub_rows( s1 );
645: copy_and_key( out, s1, ctx->ksch + r * N_BLOCK );
646: }
647: else
1.1.1.3 root 648: return (return_type) -1;
1.1 root 649: return 0;
650: }
651:
652: #endif
653:
654: #if defined( AES_DEC_PREKEYED )
655:
656: /* Decrypt a single block of 16 bytes */
657:
658: return_type aes_decrypt( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK], const aes_context ctx[1] )
659: {
660: if( ctx->rnd )
661: {
662: uint_8t s1[N_BLOCK], r;
663: copy_and_key( s1, in, ctx->ksch + ctx->rnd * N_BLOCK );
664: inv_shift_sub_rows( s1 );
665:
666: for( r = ctx->rnd ; --r ; )
667: #if defined( VERSION_1 )
668: {
669: add_round_key( s1, ctx->ksch + r * N_BLOCK );
670: inv_mix_sub_columns( s1 );
671: }
672: #else
673: { uint_8t s2[N_BLOCK];
674: copy_and_key( s2, s1, ctx->ksch + r * N_BLOCK );
675: inv_mix_sub_columns( s1, s2 );
676: }
677: #endif
678: copy_and_key( out, s1, ctx->ksch );
679: }
680: else
1.1.1.3 root 681: return (return_type) -1;
1.1 root 682: return 0;
683: }
684:
685: #endif
686:
687: #if defined( AES_ENC_128_OTFK )
688:
689: /* The 'on the fly' encryption key update for for 128 bit keys */
690:
691: static void update_encrypt_key_128( uint_8t k[N_BLOCK], uint_8t *rc )
692: { uint_8t cc;
693:
694: k[0] ^= s_box[k[13]] ^ *rc;
695: k[1] ^= s_box[k[14]];
696: k[2] ^= s_box[k[15]];
697: k[3] ^= s_box[k[12]];
698: *rc = f2( *rc );
699:
700: for(cc = 4; cc < 16; cc += 4 )
701: {
702: k[cc + 0] ^= k[cc - 4];
703: k[cc + 1] ^= k[cc - 3];
704: k[cc + 2] ^= k[cc - 2];
705: k[cc + 3] ^= k[cc - 1];
706: }
707: }
708:
709: /* Encrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
710:
711: void aes_encrypt_128( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK],
712: const unsigned char key[N_BLOCK], unsigned char o_key[N_BLOCK] )
713: { uint_8t s1[N_BLOCK], r, rc = 1;
714:
715: if(o_key != key)
716: block16_copy( o_key, key );
717: copy_and_key( s1, in, o_key );
718:
719: for( r = 1 ; r < 10 ; ++r )
720: #if defined( VERSION_1 )
721: {
722: mix_sub_columns( s1 );
723: update_encrypt_key_128( o_key, &rc );
724: add_round_key( s1, o_key );
725: }
726: #else
727: { uint_8t s2[N_BLOCK];
728: mix_sub_columns( s2, s1 );
729: update_encrypt_key_128( o_key, &rc );
730: copy_and_key( s1, s2, o_key );
731: }
732: #endif
733:
734: shift_sub_rows( s1 );
735: update_encrypt_key_128( o_key, &rc );
736: copy_and_key( out, s1, o_key );
737: }
738:
739: #endif
740:
741: #if defined( AES_DEC_128_OTFK )
742:
743: /* The 'on the fly' decryption key update for for 128 bit keys */
744:
745: static void update_decrypt_key_128( uint_8t k[N_BLOCK], uint_8t *rc )
746: { uint_8t cc;
747:
748: for( cc = 12; cc > 0; cc -= 4 )
749: {
750: k[cc + 0] ^= k[cc - 4];
751: k[cc + 1] ^= k[cc - 3];
752: k[cc + 2] ^= k[cc - 2];
753: k[cc + 3] ^= k[cc - 1];
754: }
755: *rc = d2(*rc);
756: k[0] ^= s_box[k[13]] ^ *rc;
757: k[1] ^= s_box[k[14]];
758: k[2] ^= s_box[k[15]];
759: k[3] ^= s_box[k[12]];
760: }
761:
762: /* Decrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
763:
764: void aes_decrypt_128( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK],
765: const unsigned char key[N_BLOCK], unsigned char o_key[N_BLOCK] )
766: {
767: uint_8t s1[N_BLOCK], r, rc = 0x6c;
768: if(o_key != key)
769: block16_copy( o_key, key );
770:
771: copy_and_key( s1, in, o_key );
772: inv_shift_sub_rows( s1 );
773:
774: for( r = 10 ; --r ; )
775: #if defined( VERSION_1 )
776: {
777: update_decrypt_key_128( o_key, &rc );
778: add_round_key( s1, o_key );
779: inv_mix_sub_columns( s1 );
780: }
781: #else
782: { uint_8t s2[N_BLOCK];
783: update_decrypt_key_128( o_key, &rc );
784: copy_and_key( s2, s1, o_key );
785: inv_mix_sub_columns( s1, s2 );
786: }
787: #endif
788: update_decrypt_key_128( o_key, &rc );
789: copy_and_key( out, s1, o_key );
790: }
791:
792: #endif
793:
794: #if defined( AES_ENC_256_OTFK )
795:
796: /* The 'on the fly' encryption key update for for 256 bit keys */
797:
798: static void update_encrypt_key_256( uint_8t k[2 * N_BLOCK], uint_8t *rc )
799: { uint_8t cc;
800:
801: k[0] ^= s_box[k[29]] ^ *rc;
802: k[1] ^= s_box[k[30]];
803: k[2] ^= s_box[k[31]];
804: k[3] ^= s_box[k[28]];
805: *rc = f2( *rc );
806:
807: for(cc = 4; cc < 16; cc += 4)
808: {
809: k[cc + 0] ^= k[cc - 4];
810: k[cc + 1] ^= k[cc - 3];
811: k[cc + 2] ^= k[cc - 2];
812: k[cc + 3] ^= k[cc - 1];
813: }
814:
815: k[16] ^= s_box[k[12]];
816: k[17] ^= s_box[k[13]];
817: k[18] ^= s_box[k[14]];
818: k[19] ^= s_box[k[15]];
819:
820: for( cc = 20; cc < 32; cc += 4 )
821: {
822: k[cc + 0] ^= k[cc - 4];
823: k[cc + 1] ^= k[cc - 3];
824: k[cc + 2] ^= k[cc - 2];
825: k[cc + 3] ^= k[cc - 1];
826: }
827: }
828:
829: /* Encrypt a single block of 16 bytes with 'on the fly' 256 bit keying */
830:
831: void aes_encrypt_256( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK],
832: const unsigned char key[2 * N_BLOCK], unsigned char o_key[2 * N_BLOCK] )
833: {
834: uint_8t s1[N_BLOCK], r, rc = 1;
835: if(o_key != key)
836: {
837: block16_copy( o_key, key );
838: block16_copy( o_key + 16, key + 16 );
839: }
840: copy_and_key( s1, in, o_key );
841:
842: for( r = 1 ; r < 14 ; ++r )
843: #if defined( VERSION_1 )
844: {
845: mix_sub_columns(s1);
846: if( r & 1 )
847: add_round_key( s1, o_key + 16 );
848: else
849: {
850: update_encrypt_key_256( o_key, &rc );
851: add_round_key( s1, o_key );
852: }
853: }
854: #else
855: { uint_8t s2[N_BLOCK];
856: mix_sub_columns( s2, s1 );
857: if( r & 1 )
858: copy_and_key( s1, s2, o_key + 16 );
859: else
860: {
861: update_encrypt_key_256( o_key, &rc );
862: copy_and_key( s1, s2, o_key );
863: }
864: }
865: #endif
866:
867: shift_sub_rows( s1 );
868: update_encrypt_key_256( o_key, &rc );
869: copy_and_key( out, s1, o_key );
870: }
871:
872: #endif
873:
874: #if defined( AES_DEC_256_OTFK )
875:
876: /* The 'on the fly' encryption key update for for 256 bit keys */
877:
878: static void update_decrypt_key_256( uint_8t k[2 * N_BLOCK], uint_8t *rc )
879: { uint_8t cc;
880:
881: for(cc = 28; cc > 16; cc -= 4)
882: {
883: k[cc + 0] ^= k[cc - 4];
884: k[cc + 1] ^= k[cc - 3];
885: k[cc + 2] ^= k[cc - 2];
886: k[cc + 3] ^= k[cc - 1];
887: }
888:
889: k[16] ^= s_box[k[12]];
890: k[17] ^= s_box[k[13]];
891: k[18] ^= s_box[k[14]];
892: k[19] ^= s_box[k[15]];
893:
894: for(cc = 12; cc > 0; cc -= 4)
895: {
896: k[cc + 0] ^= k[cc - 4];
897: k[cc + 1] ^= k[cc - 3];
898: k[cc + 2] ^= k[cc - 2];
899: k[cc + 3] ^= k[cc - 1];
900: }
901:
902: *rc = d2(*rc);
903: k[0] ^= s_box[k[29]] ^ *rc;
904: k[1] ^= s_box[k[30]];
905: k[2] ^= s_box[k[31]];
906: k[3] ^= s_box[k[28]];
907: }
908:
909: /* Decrypt a single block of 16 bytes with 'on the fly'
910: 256 bit keying
911: */
912: void aes_decrypt_256( const unsigned char in[N_BLOCK], unsigned char out[N_BLOCK],
913: const unsigned char key[2 * N_BLOCK], unsigned char o_key[2 * N_BLOCK] )
914: {
915: uint_8t s1[N_BLOCK], r, rc = 0x80;
916:
917: if(o_key != key)
918: {
919: block16_copy( o_key, key );
920: block16_copy( o_key + 16, key + 16 );
921: }
922:
923: copy_and_key( s1, in, o_key );
924: inv_shift_sub_rows( s1 );
925:
926: for( r = 14 ; --r ; )
927: #if defined( VERSION_1 )
928: {
929: if( ( r & 1 ) )
930: {
931: update_decrypt_key_256( o_key, &rc );
932: add_round_key( s1, o_key + 16 );
933: }
934: else
935: add_round_key( s1, o_key );
936: inv_mix_sub_columns( s1 );
937: }
938: #else
939: { uint_8t s2[N_BLOCK];
940: if( ( r & 1 ) )
941: {
942: update_decrypt_key_256( o_key, &rc );
943: copy_and_key( s2, s1, o_key + 16 );
944: }
945: else
946: copy_and_key( s2, s1, o_key );
947: inv_mix_sub_columns( s1, s2 );
948: }
949: #endif
950: copy_and_key( out, s1, o_key );
951: }
952:
953: #endif
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