aes_ni.c revision 1.3
1 /* $NetBSD: aes_ni.c,v 1.3 2020/07/25 22:12:57 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(1, "$NetBSD: aes_ni.c,v 1.3 2020/07/25 22:12:57 riastradh Exp $"); 31 32 #ifdef _KERNEL 33 #include <sys/types.h> 34 #include <sys/systm.h> 35 #else 36 #include <assert.h> 37 #include <err.h> 38 #include <stdint.h> 39 #include <string.h> 40 #define KASSERT assert 41 #define panic(fmt, args...) err(1, fmt, args) 42 #endif 43 44 #include <crypto/aes/aes.h> 45 #include <crypto/aes/aes_impl.h> 46 #include <crypto/aes/arch/x86/aes_ni.h> 47 48 #ifdef _KERNEL 49 #include <x86/cpuvar.h> 50 #include <x86/fpu.h> 51 #include <x86/specialreg.h> 52 #else 53 #include <cpuid.h> 54 #define fpu_kern_enter() ((void)0) 55 #define fpu_kern_leave() ((void)0) 56 #endif 57 58 static void 59 aesni_setenckey(struct aesenc *enc, const uint8_t key[static 16], 60 uint32_t nrounds) 61 { 62 63 switch (nrounds) { 64 case 10: 65 aesni_setenckey128(enc, key); 66 break; 67 case 12: 68 aesni_setenckey192(enc, key); 69 break; 70 case 14: 71 aesni_setenckey256(enc, key); 72 break; 73 default: 74 panic("invalid AES rounds: %u", nrounds); 75 } 76 } 77 78 static void 79 aesni_setenckey_impl(struct aesenc *enc, const uint8_t key[static 16], 80 uint32_t nrounds) 81 { 82 83 fpu_kern_enter(); 84 aesni_setenckey(enc, key, nrounds); 85 fpu_kern_leave(); 86 } 87 88 static void 89 aesni_setdeckey_impl(struct aesdec *dec, const uint8_t key[static 16], 90 uint32_t nrounds) 91 { 92 struct aesenc enc; 93 94 fpu_kern_enter(); 95 aesni_setenckey(&enc, key, nrounds); 96 aesni_enctodec(&enc, dec, nrounds); 97 fpu_kern_leave(); 98 99 explicit_memset(&enc, 0, sizeof enc); 100 } 101 102 static void 103 aesni_enc_impl(const struct aesenc *enc, const uint8_t in[static 16], 104 uint8_t out[static 16], uint32_t nrounds) 105 { 106 107 fpu_kern_enter(); 108 aesni_enc(enc, in, out, nrounds); 109 fpu_kern_leave(); 110 } 111 112 static void 113 aesni_dec_impl(const struct aesdec *dec, const uint8_t in[static 16], 114 uint8_t out[static 16], uint32_t nrounds) 115 { 116 117 fpu_kern_enter(); 118 aesni_dec(dec, in, out, nrounds); 119 fpu_kern_leave(); 120 } 121 122 static void 123 aesni_cbc_enc_impl(const struct aesenc *enc, const uint8_t in[static 16], 124 uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16], 125 uint32_t nrounds) 126 { 127 128 KASSERT(nbytes % 16 == 0); 129 130 fpu_kern_enter(); 131 aesni_cbc_enc(enc, in, out, nbytes, iv, nrounds); 132 fpu_kern_leave(); 133 } 134 135 static void 136 aesni_cbc_dec_impl(const struct aesdec *dec, const uint8_t in[static 16], 137 uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16], 138 uint32_t nrounds) 139 { 140 141 KASSERT(nbytes % 16 == 0); 142 143 fpu_kern_enter(); 144 145 if (nbytes % 128) { 146 aesni_cbc_dec1(dec, in, out, nbytes % 128, iv, nrounds); 147 in += nbytes % 128; 148 out += nbytes % 128; 149 nbytes -= nbytes % 128; 150 } 151 152 KASSERT(nbytes % 128 == 0); 153 if (nbytes) 154 aesni_cbc_dec8(dec, in, out, nbytes, iv, nrounds); 155 156 fpu_kern_leave(); 157 } 158 159 static void 160 aesni_xts_enc_impl(const struct aesenc *enc, const uint8_t in[static 16], 161 uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16], 162 uint32_t nrounds) 163 { 164 165 KASSERT(nbytes % 16 == 0); 166 167 fpu_kern_enter(); 168 169 if (nbytes % 128) { 170 aesni_xts_enc1(enc, in, out, nbytes % 128, iv, nrounds); 171 in += nbytes % 128; 172 out += nbytes % 128; 173 nbytes -= nbytes % 128; 174 } 175 176 KASSERT(nbytes % 128 == 0); 177 if (nbytes) 178 aesni_xts_enc8(enc, in, out, nbytes, iv, nrounds); 179 180 fpu_kern_leave(); 181 } 182 183 static void 184 aesni_xts_dec_impl(const struct aesdec *dec, const uint8_t in[static 16], 185 uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16], 186 uint32_t nrounds) 187 { 188 189 KASSERT(nbytes % 16 == 0); 190 191 fpu_kern_enter(); 192 193 if (nbytes % 128) { 194 aesni_xts_dec1(dec, in, out, nbytes % 128, iv, nrounds); 195 in += nbytes % 128; 196 out += nbytes % 128; 197 nbytes -= nbytes % 128; 198 } 199 200 KASSERT(nbytes % 128 == 0); 201 if (nbytes) 202 aesni_xts_dec8(dec, in, out, nbytes, iv, nrounds); 203 204 fpu_kern_leave(); 205 } 206 207 static int 208 aesni_xts_update_selftest(void) 209 { 210 static const struct { 211 uint8_t in[16], out[16]; 212 } cases[] = { 213 {{1}, {2}}, 214 {{0,0,0,0x80}, {0,0,0,0,1}}, 215 {{0,0,0,0,0,0,0,0x80}, {0,0,0,0,0,0,0,0,1}}, 216 {{0,0,0,0x80,0,0,0,0x80}, {0,0,0,0,1,0,0,0,1}}, 217 {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87}}, 218 {{0,0,0,0,0,0,0,0x80,0,0,0,0,0,0,0,0x80}, 219 {0x87,0,0,0,0,0,0,0,1}}, 220 {{0,0,0,0x80,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87,0,0,0,1}}, 221 {{0,0,0,0x80,0,0,0,0x80,0,0,0,0,0,0,0,0x80}, 222 {0x87,0,0,0,1,0,0,0,1}}, 223 }; 224 unsigned i; 225 uint8_t tweak[16]; 226 227 for (i = 0; i < sizeof(cases)/sizeof(cases[0]); i++) { 228 aesni_xts_update(cases[i].in, tweak); 229 if (memcmp(tweak, cases[i].out, 16)) 230 return -1; 231 } 232 233 /* Success! */ 234 return 0; 235 } 236 237 static int 238 aesni_probe(void) 239 { 240 int result = 0; 241 242 /* Verify that the CPU supports AES-NI. */ 243 #ifdef _KERNEL 244 if ((cpu_feature[1] & CPUID2_AES) == 0) 245 return -1; 246 #else 247 unsigned eax, ebx, ecx, edx; 248 if (!__get_cpuid(1, &eax, &ebx, &ecx, &edx)) 249 return -1; 250 if ((ecx & bit_AES) == 0) 251 return -1; 252 #endif 253 254 fpu_kern_enter(); 255 256 /* Verify that our XTS tweak update logic works. */ 257 if (aesni_xts_update_selftest()) 258 result = -1; 259 260 fpu_kern_leave(); 261 262 return result; 263 } 264 265 struct aes_impl aes_ni_impl = { 266 .ai_name = "Intel AES-NI", 267 .ai_probe = aesni_probe, 268 .ai_setenckey = aesni_setenckey_impl, 269 .ai_setdeckey = aesni_setdeckey_impl, 270 .ai_enc = aesni_enc_impl, 271 .ai_dec = aesni_dec_impl, 272 .ai_cbc_enc = aesni_cbc_enc_impl, 273 .ai_cbc_dec = aesni_cbc_dec_impl, 274 .ai_xts_enc = aesni_xts_enc_impl, 275 .ai_xts_dec = aesni_xts_dec_impl, 276 }; 277
Indexes created Tue Sep 30 17:09:57 GMT 2025