ce188d4d |
1 | /* Aes.c -- AES encryption / decryption\r |
2 | 2016-05-21 : Igor Pavlov : Public domain */\r |
3 | \r |
4 | #include "Precomp.h"\r |
5 | \r |
6 | #include "Aes.h"\r |
7 | #include "CpuArch.h"\r |
8 | \r |
9 | static UInt32 T[256 * 4];\r |
10 | static const Byte Sbox[256] = {\r |
11 | 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,\r |
12 | 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,\r |
13 | 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,\r |
14 | 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,\r |
15 | 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,\r |
16 | 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,\r |
17 | 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,\r |
18 | 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,\r |
19 | 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,\r |
20 | 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,\r |
21 | 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,\r |
22 | 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,\r |
23 | 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,\r |
24 | 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,\r |
25 | 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,\r |
26 | 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16};\r |
27 | \r |
28 | void MY_FAST_CALL AesCbc_Encode(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
29 | void MY_FAST_CALL AesCbc_Decode(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
30 | void MY_FAST_CALL AesCtr_Code(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
31 | \r |
32 | void MY_FAST_CALL AesCbc_Encode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
33 | void MY_FAST_CALL AesCbc_Decode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
34 | void MY_FAST_CALL AesCtr_Code_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);\r |
35 | \r |
36 | AES_CODE_FUNC g_AesCbc_Encode;\r |
37 | AES_CODE_FUNC g_AesCbc_Decode;\r |
38 | AES_CODE_FUNC g_AesCtr_Code;\r |
39 | \r |
40 | static UInt32 D[256 * 4];\r |
41 | static Byte InvS[256];\r |
42 | \r |
43 | static const Byte Rcon[11] = { 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };\r |
44 | \r |
45 | #define xtime(x) ((((x) << 1) ^ (((x) & 0x80) != 0 ? 0x1B : 0)) & 0xFF)\r |
46 | \r |
47 | #define Ui32(a0, a1, a2, a3) ((UInt32)(a0) | ((UInt32)(a1) << 8) | ((UInt32)(a2) << 16) | ((UInt32)(a3) << 24))\r |
48 | \r |
49 | #define gb0(x) ( (x) & 0xFF)\r |
50 | #define gb1(x) (((x) >> ( 8)) & 0xFF)\r |
51 | #define gb2(x) (((x) >> (16)) & 0xFF)\r |
52 | #define gb3(x) (((x) >> (24)) & 0xFF)\r |
53 | \r |
54 | void AesGenTables(void)\r |
55 | {\r |
56 | unsigned i;\r |
57 | for (i = 0; i < 256; i++)\r |
58 | InvS[Sbox[i]] = (Byte)i;\r |
59 | \r |
60 | for (i = 0; i < 256; i++)\r |
61 | {\r |
62 | {\r |
63 | UInt32 a1 = Sbox[i];\r |
64 | UInt32 a2 = xtime(a1);\r |
65 | UInt32 a3 = a2 ^ a1;\r |
66 | T[ i] = Ui32(a2, a1, a1, a3);\r |
67 | T[0x100 + i] = Ui32(a3, a2, a1, a1);\r |
68 | T[0x200 + i] = Ui32(a1, a3, a2, a1);\r |
69 | T[0x300 + i] = Ui32(a1, a1, a3, a2);\r |
70 | }\r |
71 | {\r |
72 | UInt32 a1 = InvS[i];\r |
73 | UInt32 a2 = xtime(a1);\r |
74 | UInt32 a4 = xtime(a2);\r |
75 | UInt32 a8 = xtime(a4);\r |
76 | UInt32 a9 = a8 ^ a1;\r |
77 | UInt32 aB = a8 ^ a2 ^ a1;\r |
78 | UInt32 aD = a8 ^ a4 ^ a1;\r |
79 | UInt32 aE = a8 ^ a4 ^ a2;\r |
80 | D[ i] = Ui32(aE, a9, aD, aB);\r |
81 | D[0x100 + i] = Ui32(aB, aE, a9, aD);\r |
82 | D[0x200 + i] = Ui32(aD, aB, aE, a9);\r |
83 | D[0x300 + i] = Ui32(a9, aD, aB, aE);\r |
84 | }\r |
85 | }\r |
86 | \r |
87 | g_AesCbc_Encode = AesCbc_Encode;\r |
88 | g_AesCbc_Decode = AesCbc_Decode;\r |
89 | g_AesCtr_Code = AesCtr_Code;\r |
90 | \r |
91 | #ifdef MY_CPU_X86_OR_AMD64\r |
92 | if (CPU_Is_Aes_Supported())\r |
93 | {\r |
94 | g_AesCbc_Encode = AesCbc_Encode_Intel;\r |
95 | g_AesCbc_Decode = AesCbc_Decode_Intel;\r |
96 | g_AesCtr_Code = AesCtr_Code_Intel;\r |
97 | }\r |
98 | #endif\r |
99 | }\r |
100 | \r |
101 | \r |
102 | #define HT(i, x, s) (T + (x << 8))[gb ## x(s[(i + x) & 3])]\r |
103 | \r |
104 | #define HT4(m, i, s, p) m[i] = \\r |
105 | HT(i, 0, s) ^ \\r |
106 | HT(i, 1, s) ^ \\r |
107 | HT(i, 2, s) ^ \\r |
108 | HT(i, 3, s) ^ w[p + i]\r |
109 | \r |
110 | #define HT16(m, s, p) \\r |
111 | HT4(m, 0, s, p); \\r |
112 | HT4(m, 1, s, p); \\r |
113 | HT4(m, 2, s, p); \\r |
114 | HT4(m, 3, s, p); \\r |
115 | \r |
116 | #define FT(i, x) Sbox[gb ## x(m[(i + x) & 3])]\r |
117 | #define FT4(i) dest[i] = Ui32(FT(i, 0), FT(i, 1), FT(i, 2), FT(i, 3)) ^ w[i];\r |
118 | \r |
119 | \r |
120 | #define HD(i, x, s) (D + (x << 8))[gb ## x(s[(i - x) & 3])]\r |
121 | \r |
122 | #define HD4(m, i, s, p) m[i] = \\r |
123 | HD(i, 0, s) ^ \\r |
124 | HD(i, 1, s) ^ \\r |
125 | HD(i, 2, s) ^ \\r |
126 | HD(i, 3, s) ^ w[p + i];\r |
127 | \r |
128 | #define HD16(m, s, p) \\r |
129 | HD4(m, 0, s, p); \\r |
130 | HD4(m, 1, s, p); \\r |
131 | HD4(m, 2, s, p); \\r |
132 | HD4(m, 3, s, p); \\r |
133 | \r |
134 | #define FD(i, x) InvS[gb ## x(m[(i - x) & 3])]\r |
135 | #define FD4(i) dest[i] = Ui32(FD(i, 0), FD(i, 1), FD(i, 2), FD(i, 3)) ^ w[i];\r |
136 | \r |
137 | void MY_FAST_CALL Aes_SetKey_Enc(UInt32 *w, const Byte *key, unsigned keySize)\r |
138 | {\r |
139 | unsigned i, wSize;\r |
140 | wSize = keySize + 28;\r |
141 | keySize /= 4;\r |
142 | w[0] = ((UInt32)keySize / 2) + 3;\r |
143 | w += 4;\r |
144 | \r |
145 | for (i = 0; i < keySize; i++, key += 4)\r |
146 | w[i] = GetUi32(key);\r |
147 | \r |
148 | for (; i < wSize; i++)\r |
149 | {\r |
150 | UInt32 t = w[i - 1];\r |
151 | unsigned rem = i % keySize;\r |
152 | if (rem == 0)\r |
153 | t = Ui32(Sbox[gb1(t)] ^ Rcon[i / keySize], Sbox[gb2(t)], Sbox[gb3(t)], Sbox[gb0(t)]);\r |
154 | else if (keySize > 6 && rem == 4)\r |
155 | t = Ui32(Sbox[gb0(t)], Sbox[gb1(t)], Sbox[gb2(t)], Sbox[gb3(t)]);\r |
156 | w[i] = w[i - keySize] ^ t;\r |
157 | }\r |
158 | }\r |
159 | \r |
160 | void MY_FAST_CALL Aes_SetKey_Dec(UInt32 *w, const Byte *key, unsigned keySize)\r |
161 | {\r |
162 | unsigned i, num;\r |
163 | Aes_SetKey_Enc(w, key, keySize);\r |
164 | num = keySize + 20;\r |
165 | w += 8;\r |
166 | for (i = 0; i < num; i++)\r |
167 | {\r |
168 | UInt32 r = w[i];\r |
169 | w[i] =\r |
170 | D[ (unsigned)Sbox[gb0(r)]] ^\r |
171 | D[0x100 + (unsigned)Sbox[gb1(r)]] ^\r |
172 | D[0x200 + (unsigned)Sbox[gb2(r)]] ^\r |
173 | D[0x300 + (unsigned)Sbox[gb3(r)]];\r |
174 | }\r |
175 | }\r |
176 | \r |
177 | /* Aes_Encode and Aes_Decode functions work with little-endian words.\r |
178 | src and dest are pointers to 4 UInt32 words.\r |
179 | src and dest can point to same block */\r |
180 | \r |
181 | static void Aes_Encode(const UInt32 *w, UInt32 *dest, const UInt32 *src)\r |
182 | {\r |
183 | UInt32 s[4];\r |
184 | UInt32 m[4];\r |
185 | UInt32 numRounds2 = w[0];\r |
186 | w += 4;\r |
187 | s[0] = src[0] ^ w[0];\r |
188 | s[1] = src[1] ^ w[1];\r |
189 | s[2] = src[2] ^ w[2];\r |
190 | s[3] = src[3] ^ w[3];\r |
191 | w += 4;\r |
192 | for (;;)\r |
193 | {\r |
194 | HT16(m, s, 0);\r |
195 | if (--numRounds2 == 0)\r |
196 | break;\r |
197 | HT16(s, m, 4);\r |
198 | w += 8;\r |
199 | }\r |
200 | w += 4;\r |
201 | FT4(0); FT4(1); FT4(2); FT4(3);\r |
202 | }\r |
203 | \r |
204 | static void Aes_Decode(const UInt32 *w, UInt32 *dest, const UInt32 *src)\r |
205 | {\r |
206 | UInt32 s[4];\r |
207 | UInt32 m[4];\r |
208 | UInt32 numRounds2 = w[0];\r |
209 | w += 4 + numRounds2 * 8;\r |
210 | s[0] = src[0] ^ w[0];\r |
211 | s[1] = src[1] ^ w[1];\r |
212 | s[2] = src[2] ^ w[2];\r |
213 | s[3] = src[3] ^ w[3];\r |
214 | for (;;)\r |
215 | {\r |
216 | w -= 8;\r |
217 | HD16(m, s, 4);\r |
218 | if (--numRounds2 == 0)\r |
219 | break;\r |
220 | HD16(s, m, 0);\r |
221 | }\r |
222 | FD4(0); FD4(1); FD4(2); FD4(3);\r |
223 | }\r |
224 | \r |
225 | void AesCbc_Init(UInt32 *p, const Byte *iv)\r |
226 | {\r |
227 | unsigned i;\r |
228 | for (i = 0; i < 4; i++)\r |
229 | p[i] = GetUi32(iv + i * 4);\r |
230 | }\r |
231 | \r |
232 | void MY_FAST_CALL AesCbc_Encode(UInt32 *p, Byte *data, size_t numBlocks)\r |
233 | {\r |
234 | for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)\r |
235 | {\r |
236 | p[0] ^= GetUi32(data);\r |
237 | p[1] ^= GetUi32(data + 4);\r |
238 | p[2] ^= GetUi32(data + 8);\r |
239 | p[3] ^= GetUi32(data + 12);\r |
240 | \r |
241 | Aes_Encode(p + 4, p, p);\r |
242 | \r |
243 | SetUi32(data, p[0]);\r |
244 | SetUi32(data + 4, p[1]);\r |
245 | SetUi32(data + 8, p[2]);\r |
246 | SetUi32(data + 12, p[3]);\r |
247 | }\r |
248 | }\r |
249 | \r |
250 | void MY_FAST_CALL AesCbc_Decode(UInt32 *p, Byte *data, size_t numBlocks)\r |
251 | {\r |
252 | UInt32 in[4], out[4];\r |
253 | for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)\r |
254 | {\r |
255 | in[0] = GetUi32(data);\r |
256 | in[1] = GetUi32(data + 4);\r |
257 | in[2] = GetUi32(data + 8);\r |
258 | in[3] = GetUi32(data + 12);\r |
259 | \r |
260 | Aes_Decode(p + 4, out, in);\r |
261 | \r |
262 | SetUi32(data, p[0] ^ out[0]);\r |
263 | SetUi32(data + 4, p[1] ^ out[1]);\r |
264 | SetUi32(data + 8, p[2] ^ out[2]);\r |
265 | SetUi32(data + 12, p[3] ^ out[3]);\r |
266 | \r |
267 | p[0] = in[0];\r |
268 | p[1] = in[1];\r |
269 | p[2] = in[2];\r |
270 | p[3] = in[3];\r |
271 | }\r |
272 | }\r |
273 | \r |
274 | void MY_FAST_CALL AesCtr_Code(UInt32 *p, Byte *data, size_t numBlocks)\r |
275 | {\r |
276 | for (; numBlocks != 0; numBlocks--)\r |
277 | {\r |
278 | UInt32 temp[4];\r |
279 | Byte buf[16];\r |
280 | int i;\r |
281 | \r |
282 | if (++p[0] == 0)\r |
283 | p[1]++;\r |
284 | \r |
285 | Aes_Encode(p + 4, temp, p);\r |
286 | \r |
287 | SetUi32(buf, temp[0]);\r |
288 | SetUi32(buf + 4, temp[1]);\r |
289 | SetUi32(buf + 8, temp[2]);\r |
290 | SetUi32(buf + 12, temp[3]);\r |
291 | \r |
292 | for (i = 0; i < 16; i++)\r |
293 | *data++ ^= buf[i];\r |
294 | }\r |
295 | }\r |