1 /* 2 * The AEGIS-128 Authenticated-Encryption Algorithm 3 * Glue for AES-NI + SSE2 implementation 4 * 5 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com> 6 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 */ 13 14 #include <crypto/cryptd.h> 15 #include <crypto/internal/aead.h> 16 #include <crypto/internal/skcipher.h> 17 #include <crypto/scatterwalk.h> 18 #include <linux/module.h> 19 #include <asm/fpu/api.h> 20 #include <asm/cpu_device_id.h> 21 22 #define AEGIS128_BLOCK_ALIGN 16 23 #define AEGIS128_BLOCK_SIZE 16 24 #define AEGIS128_NONCE_SIZE 16 25 #define AEGIS128_STATE_BLOCKS 5 26 #define AEGIS128_KEY_SIZE 16 27 #define AEGIS128_MIN_AUTH_SIZE 8 28 #define AEGIS128_MAX_AUTH_SIZE 16 29 30 asmlinkage void crypto_aegis128_aesni_init(void *state, void *key, void *iv); 31 32 asmlinkage void crypto_aegis128_aesni_ad( 33 void *state, unsigned int length, const void *data); 34 35 asmlinkage void crypto_aegis128_aesni_enc( 36 void *state, unsigned int length, const void *src, void *dst); 37 38 asmlinkage void crypto_aegis128_aesni_dec( 39 void *state, unsigned int length, const void *src, void *dst); 40 41 asmlinkage void crypto_aegis128_aesni_enc_tail( 42 void *state, unsigned int length, const void *src, void *dst); 43 44 asmlinkage void crypto_aegis128_aesni_dec_tail( 45 void *state, unsigned int length, const void *src, void *dst); 46 47 asmlinkage void crypto_aegis128_aesni_final( 48 void *state, void *tag_xor, unsigned int cryptlen, 49 unsigned int assoclen); 50 51 struct aegis_block { 52 u8 bytes[AEGIS128_BLOCK_SIZE] __aligned(AEGIS128_BLOCK_ALIGN); 53 }; 54 55 struct aegis_state { 56 struct aegis_block blocks[AEGIS128_STATE_BLOCKS]; 57 }; 58 59 struct aegis_ctx { 60 struct aegis_block key; 61 }; 62 63 struct aegis_crypt_ops { 64 int (*skcipher_walk_init)(struct skcipher_walk *walk, 65 struct aead_request *req, bool atomic); 66 67 void (*crypt_blocks)(void *state, unsigned int length, const void *src, 68 void *dst); 69 void (*crypt_tail)(void *state, unsigned int length, const void *src, 70 void *dst); 71 }; 72 73 static void crypto_aegis128_aesni_process_ad( 74 struct aegis_state *state, struct scatterlist *sg_src, 75 unsigned int assoclen) 76 { 77 struct scatter_walk walk; 78 struct aegis_block buf; 79 unsigned int pos = 0; 80 81 scatterwalk_start(&walk, sg_src); 82 while (assoclen != 0) { 83 unsigned int size = scatterwalk_clamp(&walk, assoclen); 84 unsigned int left = size; 85 void *mapped = scatterwalk_map(&walk); 86 const u8 *src = (const u8 *)mapped; 87 88 if (pos + size >= AEGIS128_BLOCK_SIZE) { 89 if (pos > 0) { 90 unsigned int fill = AEGIS128_BLOCK_SIZE - pos; 91 memcpy(buf.bytes + pos, src, fill); 92 crypto_aegis128_aesni_ad(state, 93 AEGIS128_BLOCK_SIZE, 94 buf.bytes); 95 pos = 0; 96 left -= fill; 97 src += fill; 98 } 99 100 crypto_aegis128_aesni_ad(state, left, src); 101 102 src += left & ~(AEGIS128_BLOCK_SIZE - 1); 103 left &= AEGIS128_BLOCK_SIZE - 1; 104 } 105 106 memcpy(buf.bytes + pos, src, left); 107 pos += left; 108 assoclen -= size; 109 110 scatterwalk_unmap(mapped); 111 scatterwalk_advance(&walk, size); 112 scatterwalk_done(&walk, 0, assoclen); 113 } 114 115 if (pos > 0) { 116 memset(buf.bytes + pos, 0, AEGIS128_BLOCK_SIZE - pos); 117 crypto_aegis128_aesni_ad(state, AEGIS128_BLOCK_SIZE, buf.bytes); 118 } 119 } 120 121 static void crypto_aegis128_aesni_process_crypt( 122 struct aegis_state *state, struct aead_request *req, 123 const struct aegis_crypt_ops *ops) 124 { 125 struct skcipher_walk walk; 126 u8 *src, *dst; 127 unsigned int chunksize, base; 128 129 ops->skcipher_walk_init(&walk, req, false); 130 131 while (walk.nbytes) { 132 src = walk.src.virt.addr; 133 dst = walk.dst.virt.addr; 134 chunksize = walk.nbytes; 135 136 ops->crypt_blocks(state, chunksize, src, dst); 137 138 base = chunksize & ~(AEGIS128_BLOCK_SIZE - 1); 139 src += base; 140 dst += base; 141 chunksize &= AEGIS128_BLOCK_SIZE - 1; 142 143 if (chunksize > 0) 144 ops->crypt_tail(state, chunksize, src, dst); 145 146 skcipher_walk_done(&walk, 0); 147 } 148 } 149 150 static struct aegis_ctx *crypto_aegis128_aesni_ctx(struct crypto_aead *aead) 151 { 152 u8 *ctx = crypto_aead_ctx(aead); 153 ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx)); 154 return (void *)ctx; 155 } 156 157 static int crypto_aegis128_aesni_setkey(struct crypto_aead *aead, const u8 *key, 158 unsigned int keylen) 159 { 160 struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(aead); 161 162 if (keylen != AEGIS128_KEY_SIZE) { 163 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN); 164 return -EINVAL; 165 } 166 167 memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE); 168 169 return 0; 170 } 171 172 static int crypto_aegis128_aesni_setauthsize(struct crypto_aead *tfm, 173 unsigned int authsize) 174 { 175 if (authsize > AEGIS128_MAX_AUTH_SIZE) 176 return -EINVAL; 177 if (authsize < AEGIS128_MIN_AUTH_SIZE) 178 return -EINVAL; 179 return 0; 180 } 181 182 static void crypto_aegis128_aesni_crypt(struct aead_request *req, 183 struct aegis_block *tag_xor, 184 unsigned int cryptlen, 185 const struct aegis_crypt_ops *ops) 186 { 187 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 188 struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(tfm); 189 struct aegis_state state; 190 191 kernel_fpu_begin(); 192 193 crypto_aegis128_aesni_init(&state, ctx->key.bytes, req->iv); 194 crypto_aegis128_aesni_process_ad(&state, req->src, req->assoclen); 195 crypto_aegis128_aesni_process_crypt(&state, req, ops); 196 crypto_aegis128_aesni_final(&state, tag_xor, req->assoclen, cryptlen); 197 198 kernel_fpu_end(); 199 } 200 201 static int crypto_aegis128_aesni_encrypt(struct aead_request *req) 202 { 203 static const struct aegis_crypt_ops OPS = { 204 .skcipher_walk_init = skcipher_walk_aead_encrypt, 205 .crypt_blocks = crypto_aegis128_aesni_enc, 206 .crypt_tail = crypto_aegis128_aesni_enc_tail, 207 }; 208 209 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 210 struct aegis_block tag = {}; 211 unsigned int authsize = crypto_aead_authsize(tfm); 212 unsigned int cryptlen = req->cryptlen; 213 214 crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS); 215 216 scatterwalk_map_and_copy(tag.bytes, req->dst, 217 req->assoclen + cryptlen, authsize, 1); 218 return 0; 219 } 220 221 static int crypto_aegis128_aesni_decrypt(struct aead_request *req) 222 { 223 static const struct aegis_block zeros = {}; 224 225 static const struct aegis_crypt_ops OPS = { 226 .skcipher_walk_init = skcipher_walk_aead_decrypt, 227 .crypt_blocks = crypto_aegis128_aesni_dec, 228 .crypt_tail = crypto_aegis128_aesni_dec_tail, 229 }; 230 231 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 232 struct aegis_block tag; 233 unsigned int authsize = crypto_aead_authsize(tfm); 234 unsigned int cryptlen = req->cryptlen - authsize; 235 236 scatterwalk_map_and_copy(tag.bytes, req->src, 237 req->assoclen + cryptlen, authsize, 0); 238 239 crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS); 240 241 return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0; 242 } 243 244 static int crypto_aegis128_aesni_init_tfm(struct crypto_aead *aead) 245 { 246 return 0; 247 } 248 249 static void crypto_aegis128_aesni_exit_tfm(struct crypto_aead *aead) 250 { 251 } 252 253 static int cryptd_aegis128_aesni_setkey(struct crypto_aead *aead, 254 const u8 *key, unsigned int keylen) 255 { 256 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 257 struct cryptd_aead *cryptd_tfm = *ctx; 258 259 return crypto_aead_setkey(&cryptd_tfm->base, key, keylen); 260 } 261 262 static int cryptd_aegis128_aesni_setauthsize(struct crypto_aead *aead, 263 unsigned int authsize) 264 { 265 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 266 struct cryptd_aead *cryptd_tfm = *ctx; 267 268 return crypto_aead_setauthsize(&cryptd_tfm->base, authsize); 269 } 270 271 static int cryptd_aegis128_aesni_encrypt(struct aead_request *req) 272 { 273 struct crypto_aead *aead = crypto_aead_reqtfm(req); 274 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 275 struct cryptd_aead *cryptd_tfm = *ctx; 276 277 aead = &cryptd_tfm->base; 278 if (irq_fpu_usable() && (!in_atomic() || 279 !cryptd_aead_queued(cryptd_tfm))) 280 aead = cryptd_aead_child(cryptd_tfm); 281 282 aead_request_set_tfm(req, aead); 283 284 return crypto_aead_encrypt(req); 285 } 286 287 static int cryptd_aegis128_aesni_decrypt(struct aead_request *req) 288 { 289 struct crypto_aead *aead = crypto_aead_reqtfm(req); 290 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 291 struct cryptd_aead *cryptd_tfm = *ctx; 292 293 aead = &cryptd_tfm->base; 294 if (irq_fpu_usable() && (!in_atomic() || 295 !cryptd_aead_queued(cryptd_tfm))) 296 aead = cryptd_aead_child(cryptd_tfm); 297 298 aead_request_set_tfm(req, aead); 299 300 return crypto_aead_decrypt(req); 301 } 302 303 static int cryptd_aegis128_aesni_init_tfm(struct crypto_aead *aead) 304 { 305 struct cryptd_aead *cryptd_tfm; 306 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 307 308 cryptd_tfm = cryptd_alloc_aead("__aegis128-aesni", CRYPTO_ALG_INTERNAL, 309 CRYPTO_ALG_INTERNAL); 310 if (IS_ERR(cryptd_tfm)) 311 return PTR_ERR(cryptd_tfm); 312 313 *ctx = cryptd_tfm; 314 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base)); 315 return 0; 316 } 317 318 static void cryptd_aegis128_aesni_exit_tfm(struct crypto_aead *aead) 319 { 320 struct cryptd_aead **ctx = crypto_aead_ctx(aead); 321 322 cryptd_free_aead(*ctx); 323 } 324 325 static struct aead_alg crypto_aegis128_aesni_alg[] = { 326 { 327 .setkey = crypto_aegis128_aesni_setkey, 328 .setauthsize = crypto_aegis128_aesni_setauthsize, 329 .encrypt = crypto_aegis128_aesni_encrypt, 330 .decrypt = crypto_aegis128_aesni_decrypt, 331 .init = crypto_aegis128_aesni_init_tfm, 332 .exit = crypto_aegis128_aesni_exit_tfm, 333 334 .ivsize = AEGIS128_NONCE_SIZE, 335 .maxauthsize = AEGIS128_MAX_AUTH_SIZE, 336 .chunksize = AEGIS128_BLOCK_SIZE, 337 338 .base = { 339 .cra_flags = CRYPTO_ALG_INTERNAL, 340 .cra_blocksize = 1, 341 .cra_ctxsize = sizeof(struct aegis_ctx) + 342 __alignof__(struct aegis_ctx), 343 .cra_alignmask = 0, 344 345 .cra_name = "__aegis128", 346 .cra_driver_name = "__aegis128-aesni", 347 348 .cra_module = THIS_MODULE, 349 } 350 }, { 351 .setkey = cryptd_aegis128_aesni_setkey, 352 .setauthsize = cryptd_aegis128_aesni_setauthsize, 353 .encrypt = cryptd_aegis128_aesni_encrypt, 354 .decrypt = cryptd_aegis128_aesni_decrypt, 355 .init = cryptd_aegis128_aesni_init_tfm, 356 .exit = cryptd_aegis128_aesni_exit_tfm, 357 358 .ivsize = AEGIS128_NONCE_SIZE, 359 .maxauthsize = AEGIS128_MAX_AUTH_SIZE, 360 .chunksize = AEGIS128_BLOCK_SIZE, 361 362 .base = { 363 .cra_flags = CRYPTO_ALG_ASYNC, 364 .cra_blocksize = 1, 365 .cra_ctxsize = sizeof(struct cryptd_aead *), 366 .cra_alignmask = 0, 367 368 .cra_priority = 400, 369 370 .cra_name = "aegis128", 371 .cra_driver_name = "aegis128-aesni", 372 373 .cra_module = THIS_MODULE, 374 } 375 } 376 }; 377 378 static int __init crypto_aegis128_aesni_module_init(void) 379 { 380 if (!boot_cpu_has(X86_FEATURE_XMM2) || 381 !boot_cpu_has(X86_FEATURE_AES) || 382 !boot_cpu_has(X86_FEATURE_OSXSAVE) || 383 !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL)) 384 return -ENODEV; 385 386 return crypto_register_aeads(crypto_aegis128_aesni_alg, 387 ARRAY_SIZE(crypto_aegis128_aesni_alg)); 388 } 389 390 static void __exit crypto_aegis128_aesni_module_exit(void) 391 { 392 crypto_unregister_aeads(crypto_aegis128_aesni_alg, 393 ARRAY_SIZE(crypto_aegis128_aesni_alg)); 394 } 395 396 module_init(crypto_aegis128_aesni_module_init); 397 module_exit(crypto_aegis128_aesni_module_exit); 398 399 MODULE_LICENSE("GPL"); 400 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>"); 401 MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm -- AESNI+SSE2 implementation"); 402 MODULE_ALIAS_CRYPTO("aegis128"); 403 MODULE_ALIAS_CRYPTO("aegis128-aesni"); 404