forked from riscv/sail-riscv
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathriscv_types_kext.sail
360 lines (328 loc) · 15.1 KB
/
riscv_types_kext.sail
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
/*=======================================================================================*/
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except where otherwise noted is subject the BSD */
/* two-clause license in the LICENSE file. */
/* */
/* SPDX-License-Identifier: BSD-2-Clause */
/*=======================================================================================*/
/*
* This file contains types, mappings and functions used across the
* cryptography extension instructions.
*
* This file must be included in the model build whatever the value of XLEN.
*/
/*
* Cryptography extension shared / utility functions
* ----------------------------------------------------------------------
*/
/* Auxiliary function for performing GF multiplicaiton */
val xt2 : bits(8) -> bits(8)
function xt2(x) = {
(x << 1) ^ (if bit_to_bool(x[7]) then 0x1b else 0x00)
}
val xt3 : bits(8) -> bits(8)
function xt3(x) = x ^ xt2(x)
/* Multiply 8-bit field element by 4-bit value for AES MixCols step */
val gfmul : (bits(8), bits(4)) -> bits(8)
function gfmul( x, y) = {
(if bit_to_bool(y[0]) then x else 0x00) ^
(if bit_to_bool(y[1]) then xt2( x) else 0x00) ^
(if bit_to_bool(y[2]) then xt2(xt2( x)) else 0x00) ^
(if bit_to_bool(y[3]) then xt2(xt2(xt2(x))) else 0x00)
}
/* 8-bit to 32-bit partial AES Mix Colum - forwards */
val aes_mixcolumn_byte_fwd : bits(8) -> bits(32)
function aes_mixcolumn_byte_fwd(so) = {
gfmul(so, 0x3) @ so @ so @ gfmul(so, 0x2)
}
/* 8-bit to 32-bit partial AES Mix Colum - inverse*/
val aes_mixcolumn_byte_inv : bits(8) -> bits(32)
function aes_mixcolumn_byte_inv(so) = {
gfmul(so, 0xb) @ gfmul(so, 0xd) @ gfmul(so, 0x9) @ gfmul(so, 0xe)
}
/* 32-bit to 32-bit AES forward MixColumn */
val aes_mixcolumn_fwd : bits(32) -> bits(32)
function aes_mixcolumn_fwd(x) = {
let s0 : bits (8) = x[ 7.. 0];
let s1 : bits (8) = x[15.. 8];
let s2 : bits (8) = x[23..16];
let s3 : bits (8) = x[31..24];
let b0 : bits (8) = xt2(s0) ^ xt3(s1) ^ (s2) ^ (s3);
let b1 : bits (8) = (s0) ^ xt2(s1) ^ xt3(s2) ^ (s3);
let b2 : bits (8) = (s0) ^ (s1) ^ xt2(s2) ^ xt3(s3);
let b3 : bits (8) = xt3(s0) ^ (s1) ^ (s2) ^ xt2(s3);
b3 @ b2 @ b1 @ b0 /* Return value */
}
/* 32-bit to 32-bit AES inverse MixColumn */
val aes_mixcolumn_inv : bits(32) -> bits(32)
function aes_mixcolumn_inv(x) = {
let s0 : bits (8) = x[ 7.. 0];
let s1 : bits (8) = x[15.. 8];
let s2 : bits (8) = x[23..16];
let s3 : bits (8) = x[31..24];
let b0 : bits (8) = gfmul(s0, 0xE) ^ gfmul(s1, 0xB) ^ gfmul(s2, 0xD) ^ gfmul(s3, 0x9);
let b1 : bits (8) = gfmul(s0, 0x9) ^ gfmul(s1, 0xE) ^ gfmul(s2, 0xB) ^ gfmul(s3, 0xD);
let b2 : bits (8) = gfmul(s0, 0xD) ^ gfmul(s1, 0x9) ^ gfmul(s2, 0xE) ^ gfmul(s3, 0xB);
let b3 : bits (8) = gfmul(s0, 0xB) ^ gfmul(s1, 0xD) ^ gfmul(s2, 0x9) ^ gfmul(s3, 0xE);
b3 @ b2 @ b1 @ b0 /* Return value */
}
/* Turn a round number into a round constant for AES. Note that the
AES64KS1I instruction is defined such that the r argument is always
in the range 0x0..0xA. Values of rnum outside the range 0x0..0xA
do not decode to the AES64KS1I instruction. The 0xA case is used
specifically for the AES-256 KeySchedule, and this function is never
called in that case. */
val aes_decode_rcon : bits(4) -> bits(32)
function aes_decode_rcon(r) = {
assert(r <_u 0xA);
match r {
0x0 => 0x00000001,
0x1 => 0x00000002,
0x2 => 0x00000004,
0x3 => 0x00000008,
0x4 => 0x00000010,
0x5 => 0x00000020,
0x6 => 0x00000040,
0x7 => 0x00000080,
0x8 => 0x0000001b,
0x9 => 0x00000036,
_ => internal_error(__FILE__, __LINE__, "Unexpected AES r") /* unreachable -- required to silence Sail warning */
}
}
/* SM4 SBox - only one sbox for forwards and inverse */
let sm4_sbox_table : vector(256, bits(8)) = [
0xD6, 0x90, 0xE9, 0xFE, 0xCC, 0xE1, 0x3D, 0xB7, 0x16, 0xB6, 0x14, 0xC2, 0x28,
0xFB, 0x2C, 0x05, 0x2B, 0x67, 0x9A, 0x76, 0x2A, 0xBE, 0x04, 0xC3, 0xAA, 0x44,
0x13, 0x26, 0x49, 0x86, 0x06, 0x99, 0x9C, 0x42, 0x50, 0xF4, 0x91, 0xEF, 0x98,
0x7A, 0x33, 0x54, 0x0B, 0x43, 0xED, 0xCF, 0xAC, 0x62, 0xE4, 0xB3, 0x1C, 0xA9,
0xC9, 0x08, 0xE8, 0x95, 0x80, 0xDF, 0x94, 0xFA, 0x75, 0x8F, 0x3F, 0xA6, 0x47,
0x07, 0xA7, 0xFC, 0xF3, 0x73, 0x17, 0xBA, 0x83, 0x59, 0x3C, 0x19, 0xE6, 0x85,
0x4F, 0xA8, 0x68, 0x6B, 0x81, 0xB2, 0x71, 0x64, 0xDA, 0x8B, 0xF8, 0xEB, 0x0F,
0x4B, 0x70, 0x56, 0x9D, 0x35, 0x1E, 0x24, 0x0E, 0x5E, 0x63, 0x58, 0xD1, 0xA2,
0x25, 0x22, 0x7C, 0x3B, 0x01, 0x21, 0x78, 0x87, 0xD4, 0x00, 0x46, 0x57, 0x9F,
0xD3, 0x27, 0x52, 0x4C, 0x36, 0x02, 0xE7, 0xA0, 0xC4, 0xC8, 0x9E, 0xEA, 0xBF,
0x8A, 0xD2, 0x40, 0xC7, 0x38, 0xB5, 0xA3, 0xF7, 0xF2, 0xCE, 0xF9, 0x61, 0x15,
0xA1, 0xE0, 0xAE, 0x5D, 0xA4, 0x9B, 0x34, 0x1A, 0x55, 0xAD, 0x93, 0x32, 0x30,
0xF5, 0x8C, 0xB1, 0xE3, 0x1D, 0xF6, 0xE2, 0x2E, 0x82, 0x66, 0xCA, 0x60, 0xC0,
0x29, 0x23, 0xAB, 0x0D, 0x53, 0x4E, 0x6F, 0xD5, 0xDB, 0x37, 0x45, 0xDE, 0xFD,
0x8E, 0x2F, 0x03, 0xFF, 0x6A, 0x72, 0x6D, 0x6C, 0x5B, 0x51, 0x8D, 0x1B, 0xAF,
0x92, 0xBB, 0xDD, 0xBC, 0x7F, 0x11, 0xD9, 0x5C, 0x41, 0x1F, 0x10, 0x5A, 0xD8,
0x0A, 0xC1, 0x31, 0x88, 0xA5, 0xCD, 0x7B, 0xBD, 0x2D, 0x74, 0xD0, 0x12, 0xB8,
0xE5, 0xB4, 0xB0, 0x89, 0x69, 0x97, 0x4A, 0x0C, 0x96, 0x77, 0x7E, 0x65, 0xB9,
0xF1, 0x09, 0xC5, 0x6E, 0xC6, 0x84, 0x18, 0xF0, 0x7D, 0xEC, 0x3A, 0xDC, 0x4D,
0x20, 0x79, 0xEE, 0x5F, 0x3E, 0xD7, 0xCB, 0x39, 0x48
]
let aes_sbox_fwd_table : vector(256, bits(8)) = [
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe,
0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4,
0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7,
0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3,
0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09,
0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3,
0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe,
0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92,
0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c,
0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19,
0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14,
0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2,
0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5,
0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25,
0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86,
0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e,
0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42,
0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
]
let aes_sbox_inv_table : vector(256, bits(8)) = [
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81,
0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e,
0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23,
0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66,
0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72,
0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65,
0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46,
0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca,
0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91,
0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6,
0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8,
0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f,
0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2,
0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8,
0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93,
0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb,
0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6,
0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
]
/* Lookup function - takes an index and a table, and retrieves the
* x'th element of that table. Note that the Sail vector literals
* start at index 255, and go down to 0.
*/
val sbox_lookup : (bits(8), vector(256, bits(8))) -> bits(8)
function sbox_lookup(x, table) = {
table[255 - unsigned(x)]
}
/* Easy function to perform a forward AES SBox operation on 1 byte. */
val aes_sbox_fwd : bits(8) -> bits(8)
function aes_sbox_fwd(x) = sbox_lookup(x, aes_sbox_fwd_table)
/* Easy function to perform an inverse AES SBox operation on 1 byte. */
val aes_sbox_inv : bits(8) -> bits(8)
function aes_sbox_inv(x) = sbox_lookup(x, aes_sbox_inv_table)
/* AES SubWord function used in the key expansion
* - Applies the forward sbox to each byte in the input word.
*/
val aes_subword_fwd : bits(32) -> bits(32)
function aes_subword_fwd(x) = {
aes_sbox_fwd(x[31..24]) @
aes_sbox_fwd(x[23..16]) @
aes_sbox_fwd(x[15.. 8]) @
aes_sbox_fwd(x[ 7.. 0])
}
/* AES Inverse SubWord function.
* - Applies the inverse sbox to each byte in the input word.
*/
val aes_subword_inv : bits(32) -> bits(32)
function aes_subword_inv(x) = {
aes_sbox_inv(x[31..24]) @
aes_sbox_inv(x[23..16]) @
aes_sbox_inv(x[15.. 8]) @
aes_sbox_inv(x[ 7.. 0])
}
/* Easy function to perform an SM4 SBox operation on 1 byte. */
val sm4_sbox : bits(8) -> bits(8)
function sm4_sbox(x) = sbox_lookup(x, sm4_sbox_table)
val aes_get_column : (bits(128), nat) -> bits(32)
function aes_get_column(state,c) = (state >> (to_bits(7, 32 * c)))[31..0]
/* 64-bit to 64-bit function which applies the AES forward sbox to each byte
* in a 64-bit word.
*/
val aes_apply_fwd_sbox_to_each_byte : bits(64) -> bits(64)
function aes_apply_fwd_sbox_to_each_byte(x) = {
aes_sbox_fwd(x[63..56]) @
aes_sbox_fwd(x[55..48]) @
aes_sbox_fwd(x[47..40]) @
aes_sbox_fwd(x[39..32]) @
aes_sbox_fwd(x[31..24]) @
aes_sbox_fwd(x[23..16]) @
aes_sbox_fwd(x[15.. 8]) @
aes_sbox_fwd(x[ 7.. 0])
}
/* 64-bit to 64-bit function which applies the AES inverse sbox to each byte
* in a 64-bit word.
*/
val aes_apply_inv_sbox_to_each_byte : bits(64) -> bits(64)
function aes_apply_inv_sbox_to_each_byte(x) = {
aes_sbox_inv(x[63..56]) @
aes_sbox_inv(x[55..48]) @
aes_sbox_inv(x[47..40]) @
aes_sbox_inv(x[39..32]) @
aes_sbox_inv(x[31..24]) @
aes_sbox_inv(x[23..16]) @
aes_sbox_inv(x[15.. 8]) @
aes_sbox_inv(x[ 7.. 0])
}
/*
* AES full-round transformation functions.
*/
val getbyte : (bits(64), int) -> bits(8)
function getbyte(x, i) = (x >> to_bits(6, i * 8))[7..0]
val aes_rv64_shiftrows_fwd : (bits(64), bits(64)) -> bits(64)
function aes_rv64_shiftrows_fwd(rs2, rs1) = {
getbyte(rs1, 3) @
getbyte(rs2, 6) @
getbyte(rs2, 1) @
getbyte(rs1, 4) @
getbyte(rs2, 7) @
getbyte(rs2, 2) @
getbyte(rs1, 5) @
getbyte(rs1, 0)
}
val aes_rv64_shiftrows_inv : (bits(64), bits(64)) -> bits(64)
function aes_rv64_shiftrows_inv(rs2, rs1) = {
getbyte(rs2, 3) @
getbyte(rs2, 6) @
getbyte(rs1, 1) @
getbyte(rs1, 4) @
getbyte(rs1, 7) @
getbyte(rs2, 2) @
getbyte(rs2, 5) @
getbyte(rs1, 0)
}
/* 128-bit to 128-bit implementation of the forward AES ShiftRows transform.
* Byte 0 of state is input column 0, bits 7..0.
* Byte 5 of state is input column 1, bits 15..8.
*/
val aes_shift_rows_fwd : bits(128) -> bits(128)
function aes_shift_rows_fwd(x) = {
let ic3 : bits(32) = aes_get_column(x, 3);
let ic2 : bits(32) = aes_get_column(x, 2);
let ic1 : bits(32) = aes_get_column(x, 1);
let ic0 : bits(32) = aes_get_column(x, 0);
let oc0 : bits(32) = ic3[31..24] @ ic2[23..16] @ ic1[15.. 8] @ ic0[ 7.. 0];
let oc1 : bits(32) = ic0[31..24] @ ic3[23..16] @ ic2[15.. 8] @ ic1[ 7.. 0];
let oc2 : bits(32) = ic1[31..24] @ ic0[23..16] @ ic3[15.. 8] @ ic2[ 7.. 0];
let oc3 : bits(32) = ic2[31..24] @ ic1[23..16] @ ic0[15.. 8] @ ic3[ 7.. 0];
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}
/* 128-bit to 128-bit implementation of the inverse AES ShiftRows transform.
* Byte 0 of state is input column 0, bits 7..0.
* Byte 5 of state is input column 1, bits 15..8.
*/
val aes_shift_rows_inv : bits(128) -> bits(128)
function aes_shift_rows_inv(x) = {
let ic3 : bits(32) = aes_get_column(x, 3); /* In column 3 */
let ic2 : bits(32) = aes_get_column(x, 2);
let ic1 : bits(32) = aes_get_column(x, 1);
let ic0 : bits(32) = aes_get_column(x, 0);
let oc0 : bits(32) = ic1[31..24] @ ic2[23..16] @ ic3[15.. 8] @ ic0[ 7.. 0];
let oc1 : bits(32) = ic2[31..24] @ ic3[23..16] @ ic0[15.. 8] @ ic1[ 7.. 0];
let oc2 : bits(32) = ic3[31..24] @ ic0[23..16] @ ic1[15.. 8] @ ic2[ 7.. 0];
let oc3 : bits(32) = ic0[31..24] @ ic1[23..16] @ ic2[15.. 8] @ ic3[ 7.. 0];
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}
/* Applies the forward sub-bytes step of AES to a 128-bit vector
* representation of its state.
*/
val aes_subbytes_fwd : bits(128) -> bits(128)
function aes_subbytes_fwd(x) = {
let oc0 : bits(32) = aes_subword_fwd(aes_get_column(x, 0));
let oc1 : bits(32) = aes_subword_fwd(aes_get_column(x, 1));
let oc2 : bits(32) = aes_subword_fwd(aes_get_column(x, 2));
let oc3 : bits(32) = aes_subword_fwd(aes_get_column(x, 3));
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}
/* Applies the inverse sub-bytes step of AES to a 128-bit vector
* representation of its state.
*/
val aes_subbytes_inv : bits(128) -> bits(128)
function aes_subbytes_inv(x) = {
let oc0 : bits(32) = aes_subword_inv(aes_get_column(x, 0));
let oc1 : bits(32) = aes_subword_inv(aes_get_column(x, 1));
let oc2 : bits(32) = aes_subword_inv(aes_get_column(x, 2));
let oc3 : bits(32) = aes_subword_inv(aes_get_column(x, 3));
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}
/* Applies the forward MixColumns step of AES to a 128-bit vector
* representation of its state.
*/
val aes_mixcolumns_fwd : bits(128) -> bits(128)
function aes_mixcolumns_fwd(x) = {
let oc0 : bits(32) = aes_mixcolumn_fwd(aes_get_column(x, 0));
let oc1 : bits(32) = aes_mixcolumn_fwd(aes_get_column(x, 1));
let oc2 : bits(32) = aes_mixcolumn_fwd(aes_get_column(x, 2));
let oc3 : bits(32) = aes_mixcolumn_fwd(aes_get_column(x, 3));
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}
/* Applies the inverse MixColumns step of AES to a 128-bit vector
* representation of its state.
*/
val aes_mixcolumns_inv : bits(128) -> bits(128)
function aes_mixcolumns_inv(x) = {
let oc0 : bits(32) = aes_mixcolumn_inv(aes_get_column(x, 0));
let oc1 : bits(32) = aes_mixcolumn_inv(aes_get_column(x, 1));
let oc2 : bits(32) = aes_mixcolumn_inv(aes_get_column(x, 2));
let oc3 : bits(32) = aes_mixcolumn_inv(aes_get_column(x, 3));
(oc3 @ oc2 @ oc1 @ oc0) /* Return value */
}