arch/x86/crypto/aegis256-aesni-glue.c

   1 /*
   2  * The AEGIS-256 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 AEGIS256_BLOCK_ALIGN 16
  23 #define AEGIS256_BLOCK_SIZE 16
  24 #define AEGIS256_NONCE_SIZE 32
  25 #define AEGIS256_STATE_BLOCKS 6
  26 #define AEGIS256_KEY_SIZE 32
  27 #define AEGIS256_MIN_AUTH_SIZE 8
  28 #define AEGIS256_MAX_AUTH_SIZE 16
  29
  30 asmlinkage void crypto_aegis256_aesni_init(void *state, void *key, void *iv);
  31
  32 asmlinkage void crypto_aegis256_aesni_ad(
  33                 void *state, unsigned int length, const void *data);
  34
  35 asmlinkage void crypto_aegis256_aesni_enc(
  36                 void *state, unsigned int length, const void *src, void *dst);
  37
  38 asmlinkage void crypto_aegis256_aesni_dec(
  39                 void *state, unsigned int length, const void *src, void *dst);
  40
  41 asmlinkage void crypto_aegis256_aesni_enc_tail(
  42                 void *state, unsigned int length, const void *src, void *dst);
  43
  44 asmlinkage void crypto_aegis256_aesni_dec_tail(
  45                 void *state, unsigned int length, const void *src, void *dst);
  46
  47 asmlinkage void crypto_aegis256_aesni_final(
  48                 void *state, void *tag_xor, unsigned int cryptlen,
  49                 unsigned int assoclen);
  50
  51 struct aegis_block {
  52         u8 bytes[AEGIS256_BLOCK_SIZE] __aligned(AEGIS256_BLOCK_ALIGN);
  53 };
  54
  55 struct aegis_state {
  56         struct aegis_block blocks[AEGIS256_STATE_BLOCKS];
  57 };
  58
  59 struct aegis_ctx {
  60         struct aegis_block key[AEGIS256_KEY_SIZE / AEGIS256_BLOCK_SIZE];
  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_aegis256_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 >= AEGIS256_BLOCK_SIZE) {
  89                         if (pos > 0) {
  90                                 unsigned int fill = AEGIS256_BLOCK_SIZE - pos;
  91                                 memcpy(buf.bytes + pos, src, fill);
  92                                 crypto_aegis256_aesni_ad(state,
  93                                                          AEGIS256_BLOCK_SIZE,
  94                                                          buf.bytes);
  95                                 pos = 0;
  96                                 left -= fill;
  97                                 src += fill;
  98                         }
  99
 100                         crypto_aegis256_aesni_ad(state, left, src);
 101
 102                         src += left & ~(AEGIS256_BLOCK_SIZE - 1);
 103                         left &= AEGIS256_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, AEGIS256_BLOCK_SIZE - pos);
 117                 crypto_aegis256_aesni_ad(state, AEGIS256_BLOCK_SIZE, buf.bytes);
 118         }
 119 }
 120
 121 static void crypto_aegis256_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 & ~(AEGIS256_BLOCK_SIZE - 1);
 139                 src += base;
 140                 dst += base;
 141                 chunksize &= AEGIS256_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_aegis256_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_aegis256_aesni_setkey(struct crypto_aead *aead, const u8 *key,
 158                                         unsigned int keylen)
 159 {
 160         struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(aead);
 161
 162         if (keylen != AEGIS256_KEY_SIZE) {
 163                 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
 164                 return -EINVAL;
 165         }
 166
 167         memcpy(ctx->key, key, AEGIS256_KEY_SIZE);
 168
 169         return 0;
 170 }
 171
 172 static int crypto_aegis256_aesni_setauthsize(struct crypto_aead *tfm,
 173                                                 unsigned int authsize)
 174 {
 175         if (authsize > AEGIS256_MAX_AUTH_SIZE)
 176                 return -EINVAL;
 177         if (authsize < AEGIS256_MIN_AUTH_SIZE)
 178                 return -EINVAL;
 179         return 0;
 180 }
 181
 182 static void crypto_aegis256_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_aegis256_aesni_ctx(tfm);
 189         struct aegis_state state;
 190
 191         kernel_fpu_begin();
 192
 193         crypto_aegis256_aesni_init(&state, ctx->key, req->iv);
 194         crypto_aegis256_aesni_process_ad(&state, req->src, req->assoclen);
 195         crypto_aegis256_aesni_process_crypt(&state, req, ops);
 196         crypto_aegis256_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
 197
 198         kernel_fpu_end();
 199 }
 200
 201 static int crypto_aegis256_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_aegis256_aesni_enc,
 206                 .crypt_tail = crypto_aegis256_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_aegis256_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_aegis256_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_aegis256_aesni_dec,
 228                 .crypt_tail = crypto_aegis256_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_aegis256_aesni_crypt(req, &tag, cryptlen, &OPS);
 240
 241         return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
 242 }
 243
 244 static int crypto_aegis256_aesni_init_tfm(struct crypto_aead *aead)
 245 {
 246         return 0;
 247 }
 248
 249 static void crypto_aegis256_aesni_exit_tfm(struct crypto_aead *aead)
 250 {
 251 }
 252
 253 static int cryptd_aegis256_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_aegis256_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_aegis256_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_aegis256_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_aegis256_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("__aegis256-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_aegis256_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_aegis256_aesni_alg[] = {
 326         {
 327                 .setkey = crypto_aegis256_aesni_setkey,
 328                 .setauthsize = crypto_aegis256_aesni_setauthsize,
 329                 .encrypt = crypto_aegis256_aesni_encrypt,
 330                 .decrypt = crypto_aegis256_aesni_decrypt,
 331                 .init = crypto_aegis256_aesni_init_tfm,
 332                 .exit = crypto_aegis256_aesni_exit_tfm,
 333
 334                 .ivsize = AEGIS256_NONCE_SIZE,
 335                 .maxauthsize = AEGIS256_MAX_AUTH_SIZE,
 336                 .chunksize = AEGIS256_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 = "__aegis256",
 346                         .cra_driver_name = "__aegis256-aesni",
 347
 348                         .cra_module = THIS_MODULE,
 349                 }
 350         }, {
 351                 .setkey = cryptd_aegis256_aesni_setkey,
 352                 .setauthsize = cryptd_aegis256_aesni_setauthsize,
 353                 .encrypt = cryptd_aegis256_aesni_encrypt,
 354                 .decrypt = cryptd_aegis256_aesni_decrypt,
 355                 .init = cryptd_aegis256_aesni_init_tfm,
 356                 .exit = cryptd_aegis256_aesni_exit_tfm,
 357
 358                 .ivsize = AEGIS256_NONCE_SIZE,
 359                 .maxauthsize = AEGIS256_MAX_AUTH_SIZE,
 360                 .chunksize = AEGIS256_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 = "aegis256",
 371                         .cra_driver_name = "aegis256-aesni",
 372
 373                         .cra_module = THIS_MODULE,
 374                 }
 375         }
 376 };
 377
 378 static int __init crypto_aegis256_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_aegis256_aesni_alg,
 387                                     ARRAY_SIZE(crypto_aegis256_aesni_alg));
 388 }
 389
 390 static void __exit crypto_aegis256_aesni_module_exit(void)
 391 {
 392         crypto_unregister_aeads(crypto_aegis256_aesni_alg,
 393                                 ARRAY_SIZE(crypto_aegis256_aesni_alg));
 394 }
 395
 396 module_init(crypto_aegis256_aesni_module_init);
 397 module_exit(crypto_aegis256_aesni_module_exit);
 398
 399 MODULE_LICENSE("GPL");
 400 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
 401 MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm -- AESNI+SSE2 implementation");
 402 MODULE_ALIAS_CRYPTO("aegis256");
 403 MODULE_ALIAS_CRYPTO("aegis256-aesni");