1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Scalar fixed time AES core transform 2 * Scalar fixed time AES core transform
4 * 3 *
5 * Copyright (C) 2017 Linaro Ltd <ard.biesheuv 4 * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
>> 5 *
>> 6 * This program is free software; you can redistribute it and/or modify
>> 7 * it under the terms of the GNU General Public License version 2 as
>> 8 * published by the Free Software Foundation.
6 */ 9 */
7 10
8 #include <crypto/aes.h> 11 #include <crypto/aes.h>
9 #include <crypto/algapi.h> !! 12 #include <linux/crypto.h>
10 #include <linux/module.h> 13 #include <linux/module.h>
>> 14 #include <asm/unaligned.h>
>> 15
>> 16 /*
>> 17 * Emit the sbox as volatile const to prevent the compiler from doing
>> 18 * constant folding on sbox references involving fixed indexes.
>> 19 */
>> 20 static volatile const u8 __cacheline_aligned __aesti_sbox[] = {
>> 21 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
>> 22 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
>> 23 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
>> 24 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
>> 25 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
>> 26 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
>> 27 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
>> 28 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
>> 29 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
>> 30 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
>> 31 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
>> 32 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
>> 33 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
>> 34 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
>> 35 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
>> 36 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
>> 37 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
>> 38 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
>> 39 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
>> 40 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
>> 41 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
>> 42 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
>> 43 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
>> 44 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
>> 45 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
>> 46 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
>> 47 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
>> 48 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
>> 49 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
>> 50 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
>> 51 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
>> 52 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
>> 53 };
>> 54
>> 55 static volatile const u8 __cacheline_aligned __aesti_inv_sbox[] = {
>> 56 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
>> 57 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
>> 58 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
>> 59 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
>> 60 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
>> 61 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
>> 62 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
>> 63 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
>> 64 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
>> 65 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
>> 66 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
>> 67 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
>> 68 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
>> 69 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
>> 70 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
>> 71 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
>> 72 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
>> 73 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
>> 74 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
>> 75 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
>> 76 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
>> 77 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
>> 78 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
>> 79 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
>> 80 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
>> 81 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
>> 82 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
>> 83 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
>> 84 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
>> 85 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
>> 86 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
>> 87 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
>> 88 };
>> 89
>> 90 static u32 mul_by_x(u32 w)
>> 91 {
>> 92 u32 x = w & 0x7f7f7f7f;
>> 93 u32 y = w & 0x80808080;
>> 94
>> 95 /* multiply by polynomial 'x' (0b10) in GF(2^8) */
>> 96 return (x << 1) ^ (y >> 7) * 0x1b;
>> 97 }
>> 98
>> 99 static u32 mul_by_x2(u32 w)
>> 100 {
>> 101 u32 x = w & 0x3f3f3f3f;
>> 102 u32 y = w & 0x80808080;
>> 103 u32 z = w & 0x40404040;
>> 104
>> 105 /* multiply by polynomial 'x^2' (0b100) in GF(2^8) */
>> 106 return (x << 2) ^ (y >> 7) * 0x36 ^ (z >> 6) * 0x1b;
>> 107 }
>> 108
>> 109 static u32 mix_columns(u32 x)
>> 110 {
>> 111 /*
>> 112 * Perform the following matrix multiplication in GF(2^8)
>> 113 *
>> 114 * | 0x2 0x3 0x1 0x1 | | x[0] |
>> 115 * | 0x1 0x2 0x3 0x1 | | x[1] |
>> 116 * | 0x1 0x1 0x2 0x3 | x | x[2] |
>> 117 * | 0x3 0x1 0x1 0x2 | | x[3] |
>> 118 */
>> 119 u32 y = mul_by_x(x) ^ ror32(x, 16);
>> 120
>> 121 return y ^ ror32(x ^ y, 8);
>> 122 }
>> 123
>> 124 static u32 inv_mix_columns(u32 x)
>> 125 {
>> 126 /*
>> 127 * Perform the following matrix multiplication in GF(2^8)
>> 128 *
>> 129 * | 0xe 0xb 0xd 0x9 | | x[0] |
>> 130 * | 0x9 0xe 0xb 0xd | | x[1] |
>> 131 * | 0xd 0x9 0xe 0xb | x | x[2] |
>> 132 * | 0xb 0xd 0x9 0xe | | x[3] |
>> 133 *
>> 134 * which can conveniently be reduced to
>> 135 *
>> 136 * | 0x2 0x3 0x1 0x1 | | 0x5 0x0 0x4 0x0 | | x[0] |
>> 137 * | 0x1 0x2 0x3 0x1 | | 0x0 0x5 0x0 0x4 | | x[1] |
>> 138 * | 0x1 0x1 0x2 0x3 | x | 0x4 0x0 0x5 0x0 | x | x[2] |
>> 139 * | 0x3 0x1 0x1 0x2 | | 0x0 0x4 0x0 0x5 | | x[3] |
>> 140 */
>> 141 u32 y = mul_by_x2(x);
>> 142
>> 143 return mix_columns(x ^ y ^ ror32(y, 16));
>> 144 }
>> 145
>> 146 static __always_inline u32 subshift(u32 in[], int pos)
>> 147 {
>> 148 return (__aesti_sbox[in[pos] & 0xff]) ^
>> 149 (__aesti_sbox[(in[(pos + 1) % 4] >> 8) & 0xff] << 8) ^
>> 150 (__aesti_sbox[(in[(pos + 2) % 4] >> 16) & 0xff] << 16) ^
>> 151 (__aesti_sbox[(in[(pos + 3) % 4] >> 24) & 0xff] << 24);
>> 152 }
>> 153
>> 154 static __always_inline u32 inv_subshift(u32 in[], int pos)
>> 155 {
>> 156 return (__aesti_inv_sbox[in[pos] & 0xff]) ^
>> 157 (__aesti_inv_sbox[(in[(pos + 3) % 4] >> 8) & 0xff] << 8) ^
>> 158 (__aesti_inv_sbox[(in[(pos + 2) % 4] >> 16) & 0xff] << 16) ^
>> 159 (__aesti_inv_sbox[(in[(pos + 1) % 4] >> 24) & 0xff] << 24);
>> 160 }
>> 161
>> 162 static u32 subw(u32 in)
>> 163 {
>> 164 return (__aesti_sbox[in & 0xff]) ^
>> 165 (__aesti_sbox[(in >> 8) & 0xff] << 8) ^
>> 166 (__aesti_sbox[(in >> 16) & 0xff] << 16) ^
>> 167 (__aesti_sbox[(in >> 24) & 0xff] << 24);
>> 168 }
>> 169
>> 170 static int aesti_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
>> 171 unsigned int key_len)
>> 172 {
>> 173 u32 kwords = key_len / sizeof(u32);
>> 174 u32 rc, i, j;
>> 175
>> 176 if (key_len != AES_KEYSIZE_128 &&
>> 177 key_len != AES_KEYSIZE_192 &&
>> 178 key_len != AES_KEYSIZE_256)
>> 179 return -EINVAL;
>> 180
>> 181 ctx->key_length = key_len;
>> 182
>> 183 for (i = 0; i < kwords; i++)
>> 184 ctx->key_enc[i] = get_unaligned_le32(in_key + i * sizeof(u32));
>> 185
>> 186 for (i = 0, rc = 1; i < 10; i++, rc = mul_by_x(rc)) {
>> 187 u32 *rki = ctx->key_enc + (i * kwords);
>> 188 u32 *rko = rki + kwords;
>> 189
>> 190 rko[0] = ror32(subw(rki[kwords - 1]), 8) ^ rc ^ rki[0];
>> 191 rko[1] = rko[0] ^ rki[1];
>> 192 rko[2] = rko[1] ^ rki[2];
>> 193 rko[3] = rko[2] ^ rki[3];
>> 194
>> 195 if (key_len == 24) {
>> 196 if (i >= 7)
>> 197 break;
>> 198 rko[4] = rko[3] ^ rki[4];
>> 199 rko[5] = rko[4] ^ rki[5];
>> 200 } else if (key_len == 32) {
>> 201 if (i >= 6)
>> 202 break;
>> 203 rko[4] = subw(rko[3]) ^ rki[4];
>> 204 rko[5] = rko[4] ^ rki[5];
>> 205 rko[6] = rko[5] ^ rki[6];
>> 206 rko[7] = rko[6] ^ rki[7];
>> 207 }
>> 208 }
>> 209
>> 210 /*
>> 211 * Generate the decryption keys for the Equivalent Inverse Cipher.
>> 212 * This involves reversing the order of the round keys, and applying
>> 213 * the Inverse Mix Columns transformation to all but the first and
>> 214 * the last one.
>> 215 */
>> 216 ctx->key_dec[0] = ctx->key_enc[key_len + 24];
>> 217 ctx->key_dec[1] = ctx->key_enc[key_len + 25];
>> 218 ctx->key_dec[2] = ctx->key_enc[key_len + 26];
>> 219 ctx->key_dec[3] = ctx->key_enc[key_len + 27];
>> 220
>> 221 for (i = 4, j = key_len + 20; j > 0; i += 4, j -= 4) {
>> 222 ctx->key_dec[i] = inv_mix_columns(ctx->key_enc[j]);
>> 223 ctx->key_dec[i + 1] = inv_mix_columns(ctx->key_enc[j + 1]);
>> 224 ctx->key_dec[i + 2] = inv_mix_columns(ctx->key_enc[j + 2]);
>> 225 ctx->key_dec[i + 3] = inv_mix_columns(ctx->key_enc[j + 3]);
>> 226 }
>> 227
>> 228 ctx->key_dec[i] = ctx->key_enc[0];
>> 229 ctx->key_dec[i + 1] = ctx->key_enc[1];
>> 230 ctx->key_dec[i + 2] = ctx->key_enc[2];
>> 231 ctx->key_dec[i + 3] = ctx->key_enc[3];
>> 232
>> 233 return 0;
>> 234 }
11 235
12 static int aesti_set_key(struct crypto_tfm *tf 236 static int aesti_set_key(struct crypto_tfm *tfm, const u8 *in_key,
13 unsigned int key_len) 237 unsigned int key_len)
14 { 238 {
15 struct crypto_aes_ctx *ctx = crypto_tf 239 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
>> 240 int err;
>> 241
>> 242 err = aesti_expand_key(ctx, in_key, key_len);
>> 243 if (err)
>> 244 return err;
>> 245
>> 246 /*
>> 247 * In order to force the compiler to emit data independent Sbox lookups
>> 248 * at the start of each block, xor the first round key with values at
>> 249 * fixed indexes in the Sbox. This will need to be repeated each time
>> 250 * the key is used, which will pull the entire Sbox into the D-cache
>> 251 * before any data dependent Sbox lookups are performed.
>> 252 */
>> 253 ctx->key_enc[0] ^= __aesti_sbox[ 0] ^ __aesti_sbox[128];
>> 254 ctx->key_enc[1] ^= __aesti_sbox[32] ^ __aesti_sbox[160];
>> 255 ctx->key_enc[2] ^= __aesti_sbox[64] ^ __aesti_sbox[192];
>> 256 ctx->key_enc[3] ^= __aesti_sbox[96] ^ __aesti_sbox[224];
>> 257
>> 258 ctx->key_dec[0] ^= __aesti_inv_sbox[ 0] ^ __aesti_inv_sbox[128];
>> 259 ctx->key_dec[1] ^= __aesti_inv_sbox[32] ^ __aesti_inv_sbox[160];
>> 260 ctx->key_dec[2] ^= __aesti_inv_sbox[64] ^ __aesti_inv_sbox[192];
>> 261 ctx->key_dec[3] ^= __aesti_inv_sbox[96] ^ __aesti_inv_sbox[224];
16 262
17 return aes_expandkey(ctx, in_key, key_ !! 263 return 0;
18 } 264 }
19 265
20 static void aesti_encrypt(struct crypto_tfm *t 266 static void aesti_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
21 { 267 {
22 const struct crypto_aes_ctx *ctx = cry 268 const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
>> 269 const u32 *rkp = ctx->key_enc + 4;
>> 270 int rounds = 6 + ctx->key_length / 4;
>> 271 u32 st0[4], st1[4];
23 unsigned long flags; 272 unsigned long flags;
>> 273 int round;
>> 274
>> 275 st0[0] = ctx->key_enc[0] ^ get_unaligned_le32(in);
>> 276 st0[1] = ctx->key_enc[1] ^ get_unaligned_le32(in + 4);
>> 277 st0[2] = ctx->key_enc[2] ^ get_unaligned_le32(in + 8);
>> 278 st0[3] = ctx->key_enc[3] ^ get_unaligned_le32(in + 12);
24 279
25 /* 280 /*
26 * Temporarily disable interrupts to a 281 * Temporarily disable interrupts to avoid races where cachelines are
27 * evicted when the CPU is interrupted 282 * evicted when the CPU is interrupted to do something else.
28 */ 283 */
29 local_irq_save(flags); 284 local_irq_save(flags);
30 285
31 aes_encrypt(ctx, out, in); !! 286 st0[0] ^= __aesti_sbox[ 0] ^ __aesti_sbox[128];
>> 287 st0[1] ^= __aesti_sbox[32] ^ __aesti_sbox[160];
>> 288 st0[2] ^= __aesti_sbox[64] ^ __aesti_sbox[192];
>> 289 st0[3] ^= __aesti_sbox[96] ^ __aesti_sbox[224];
>> 290
>> 291 for (round = 0;; round += 2, rkp += 8) {
>> 292 st1[0] = mix_columns(subshift(st0, 0)) ^ rkp[0];
>> 293 st1[1] = mix_columns(subshift(st0, 1)) ^ rkp[1];
>> 294 st1[2] = mix_columns(subshift(st0, 2)) ^ rkp[2];
>> 295 st1[3] = mix_columns(subshift(st0, 3)) ^ rkp[3];
>> 296
>> 297 if (round == rounds - 2)
>> 298 break;
>> 299
>> 300 st0[0] = mix_columns(subshift(st1, 0)) ^ rkp[4];
>> 301 st0[1] = mix_columns(subshift(st1, 1)) ^ rkp[5];
>> 302 st0[2] = mix_columns(subshift(st1, 2)) ^ rkp[6];
>> 303 st0[3] = mix_columns(subshift(st1, 3)) ^ rkp[7];
>> 304 }
>> 305
>> 306 put_unaligned_le32(subshift(st1, 0) ^ rkp[4], out);
>> 307 put_unaligned_le32(subshift(st1, 1) ^ rkp[5], out + 4);
>> 308 put_unaligned_le32(subshift(st1, 2) ^ rkp[6], out + 8);
>> 309 put_unaligned_le32(subshift(st1, 3) ^ rkp[7], out + 12);
32 310
33 local_irq_restore(flags); 311 local_irq_restore(flags);
34 } 312 }
35 313
36 static void aesti_decrypt(struct crypto_tfm *t 314 static void aesti_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
37 { 315 {
38 const struct crypto_aes_ctx *ctx = cry 316 const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
>> 317 const u32 *rkp = ctx->key_dec + 4;
>> 318 int rounds = 6 + ctx->key_length / 4;
>> 319 u32 st0[4], st1[4];
39 unsigned long flags; 320 unsigned long flags;
>> 321 int round;
>> 322
>> 323 st0[0] = ctx->key_dec[0] ^ get_unaligned_le32(in);
>> 324 st0[1] = ctx->key_dec[1] ^ get_unaligned_le32(in + 4);
>> 325 st0[2] = ctx->key_dec[2] ^ get_unaligned_le32(in + 8);
>> 326 st0[3] = ctx->key_dec[3] ^ get_unaligned_le32(in + 12);
40 327
41 /* 328 /*
42 * Temporarily disable interrupts to a 329 * Temporarily disable interrupts to avoid races where cachelines are
43 * evicted when the CPU is interrupted 330 * evicted when the CPU is interrupted to do something else.
44 */ 331 */
45 local_irq_save(flags); 332 local_irq_save(flags);
46 333
47 aes_decrypt(ctx, out, in); !! 334 st0[0] ^= __aesti_inv_sbox[ 0] ^ __aesti_inv_sbox[128];
>> 335 st0[1] ^= __aesti_inv_sbox[32] ^ __aesti_inv_sbox[160];
>> 336 st0[2] ^= __aesti_inv_sbox[64] ^ __aesti_inv_sbox[192];
>> 337 st0[3] ^= __aesti_inv_sbox[96] ^ __aesti_inv_sbox[224];
>> 338
>> 339 for (round = 0;; round += 2, rkp += 8) {
>> 340 st1[0] = inv_mix_columns(inv_subshift(st0, 0)) ^ rkp[0];
>> 341 st1[1] = inv_mix_columns(inv_subshift(st0, 1)) ^ rkp[1];
>> 342 st1[2] = inv_mix_columns(inv_subshift(st0, 2)) ^ rkp[2];
>> 343 st1[3] = inv_mix_columns(inv_subshift(st0, 3)) ^ rkp[3];
>> 344
>> 345 if (round == rounds - 2)
>> 346 break;
>> 347
>> 348 st0[0] = inv_mix_columns(inv_subshift(st1, 0)) ^ rkp[4];
>> 349 st0[1] = inv_mix_columns(inv_subshift(st1, 1)) ^ rkp[5];
>> 350 st0[2] = inv_mix_columns(inv_subshift(st1, 2)) ^ rkp[6];
>> 351 st0[3] = inv_mix_columns(inv_subshift(st1, 3)) ^ rkp[7];
>> 352 }
>> 353
>> 354 put_unaligned_le32(inv_subshift(st1, 0) ^ rkp[4], out);
>> 355 put_unaligned_le32(inv_subshift(st1, 1) ^ rkp[5], out + 4);
>> 356 put_unaligned_le32(inv_subshift(st1, 2) ^ rkp[6], out + 8);
>> 357 put_unaligned_le32(inv_subshift(st1, 3) ^ rkp[7], out + 12);
48 358
49 local_irq_restore(flags); 359 local_irq_restore(flags);
50 } 360 }
51 361
52 static struct crypto_alg aes_alg = { 362 static struct crypto_alg aes_alg = {
53 .cra_name = "aes 363 .cra_name = "aes",
54 .cra_driver_name = "aes 364 .cra_driver_name = "aes-fixed-time",
55 .cra_priority = 100 365 .cra_priority = 100 + 1,
56 .cra_flags = CRYP 366 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
57 .cra_blocksize = AES_ 367 .cra_blocksize = AES_BLOCK_SIZE,
58 .cra_ctxsize = size 368 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
59 .cra_module = THIS 369 .cra_module = THIS_MODULE,
60 370
61 .cra_cipher.cia_min_keysize = AES_ 371 .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
62 .cra_cipher.cia_max_keysize = AES_ 372 .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
63 .cra_cipher.cia_setkey = aest 373 .cra_cipher.cia_setkey = aesti_set_key,
64 .cra_cipher.cia_encrypt = aest 374 .cra_cipher.cia_encrypt = aesti_encrypt,
65 .cra_cipher.cia_decrypt = aest 375 .cra_cipher.cia_decrypt = aesti_decrypt
66 }; 376 };
67 377
68 static int __init aes_init(void) 378 static int __init aes_init(void)
69 { 379 {
70 return crypto_register_alg(&aes_alg); 380 return crypto_register_alg(&aes_alg);
71 } 381 }
72 382
73 static void __exit aes_fini(void) 383 static void __exit aes_fini(void)
74 { 384 {
75 crypto_unregister_alg(&aes_alg); 385 crypto_unregister_alg(&aes_alg);
76 } 386 }
77 387
78 module_init(aes_init); 388 module_init(aes_init);
79 module_exit(aes_fini); 389 module_exit(aes_fini);
80 390
81 MODULE_DESCRIPTION("Generic fixed time AES"); 391 MODULE_DESCRIPTION("Generic fixed time AES");
82 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@ 392 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
83 MODULE_LICENSE("GPL v2"); 393 MODULE_LICENSE("GPL v2");
84 394
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