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 skcipher_walk *walk,
 123                 const struct aegis_crypt_ops *ops)
 124 {
 125         while (walk->nbytes >= AEGIS256_BLOCK_SIZE) {
 126                 ops->crypt_blocks(state,
 127                                   round_down(walk->nbytes, AEGIS256_BLOCK_SIZE),
 128                                   walk->src.virt.addr, walk->dst.virt.addr);
 129                 skcipher_walk_done(walk, walk->nbytes % AEGIS256_BLOCK_SIZE);
 130         }
 131
 132         if (walk->nbytes) {
 133                 ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr,
 134                                 walk->dst.virt.addr);
 135                 skcipher_walk_done(walk, 0);
 136         }
 137 }
 138
 139 static struct aegis_ctx *crypto_aegis256_aesni_ctx(struct crypto_aead *aead)
 140 {
 141         u8 *ctx = crypto_aead_ctx(aead);
 142         ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
 143         return (void *)ctx;
 144 }
 145
 146 static int crypto_aegis256_aesni_setkey(struct crypto_aead *aead, const u8 *key,
 147                                         unsigned int keylen)
 148 {
 149         struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(aead);
 150
 151         if (keylen != AEGIS256_KEY_SIZE) {
 152                 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
 153                 return -EINVAL;
 154         }
 155
 156         memcpy(ctx->key, key, AEGIS256_KEY_SIZE);
 157
 158         return 0;
 159 }
 160
 161 static int crypto_aegis256_aesni_setauthsize(struct crypto_aead *tfm,
 162                                                 unsigned int authsize)
 163 {
 164         if (authsize > AEGIS256_MAX_AUTH_SIZE)
 165                 return -EINVAL;
 166         if (authsize < AEGIS256_MIN_AUTH_SIZE)
 167                 return -EINVAL;
 168         return 0;
 169 }
 170
 171 static void crypto_aegis256_aesni_crypt(struct aead_request *req,
 172                                         struct aegis_block *tag_xor,
 173                                         unsigned int cryptlen,
 174                                         const struct aegis_crypt_ops *ops)
 175 {
 176         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 177         struct aegis_ctx *ctx = crypto_aegis256_aesni_ctx(tfm);
 178         struct skcipher_walk walk;
 179         struct aegis_state state;
 180
 181         ops->skcipher_walk_init(&walk, req, true);
 182
 183         kernel_fpu_begin();
 184
 185         crypto_aegis256_aesni_init(&state, ctx->key, req->iv);
 186         crypto_aegis256_aesni_process_ad(&state, req->src, req->assoclen);
 187         crypto_aegis256_aesni_process_crypt(&state, &walk, ops);
 188         crypto_aegis256_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
 189
 190         kernel_fpu_end();
 191 }
 192
 193 static int crypto_aegis256_aesni_encrypt(struct aead_request *req)
 194 {
 195         static const struct aegis_crypt_ops OPS = {
 196                 .skcipher_walk_init = skcipher_walk_aead_encrypt,
 197                 .crypt_blocks = crypto_aegis256_aesni_enc,
 198                 .crypt_tail = crypto_aegis256_aesni_enc_tail,
 199         };
 200
 201         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 202         struct aegis_block tag = {};
 203         unsigned int authsize = crypto_aead_authsize(tfm);
 204         unsigned int cryptlen = req->cryptlen;
 205
 206         crypto_aegis256_aesni_crypt(req, &tag, cryptlen, &OPS);
 207
 208         scatterwalk_map_and_copy(tag.bytes, req->dst,
 209                                  req->assoclen + cryptlen, authsize, 1);
 210         return 0;
 211 }
 212
 213 static int crypto_aegis256_aesni_decrypt(struct aead_request *req)
 214 {
 215         static const struct aegis_block zeros = {};
 216
 217         static const struct aegis_crypt_ops OPS = {
 218                 .skcipher_walk_init = skcipher_walk_aead_decrypt,
 219                 .crypt_blocks = crypto_aegis256_aesni_dec,
 220                 .crypt_tail = crypto_aegis256_aesni_dec_tail,
 221         };
 222
 223         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 224         struct aegis_block tag;
 225         unsigned int authsize = crypto_aead_authsize(tfm);
 226         unsigned int cryptlen = req->cryptlen - authsize;
 227
 228         scatterwalk_map_and_copy(tag.bytes, req->src,
 229                                  req->assoclen + cryptlen, authsize, 0);
 230
 231         crypto_aegis256_aesni_crypt(req, &tag, cryptlen, &OPS);
 232
 233         return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
 234 }
 235
 236 static int crypto_aegis256_aesni_init_tfm(struct crypto_aead *aead)
 237 {
 238         return 0;
 239 }
 240
 241 static void crypto_aegis256_aesni_exit_tfm(struct crypto_aead *aead)
 242 {
 243 }
 244
 245 static int cryptd_aegis256_aesni_setkey(struct crypto_aead *aead,
 246                                         const u8 *key, unsigned int keylen)
 247 {
 248         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 249         struct cryptd_aead *cryptd_tfm = *ctx;
 250
 251         return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
 252 }
 253
 254 static int cryptd_aegis256_aesni_setauthsize(struct crypto_aead *aead,
 255                                              unsigned int authsize)
 256 {
 257         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 258         struct cryptd_aead *cryptd_tfm = *ctx;
 259
 260         return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
 261 }
 262
 263 static int cryptd_aegis256_aesni_encrypt(struct aead_request *req)
 264 {
 265         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 266         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 267         struct cryptd_aead *cryptd_tfm = *ctx;
 268
 269         aead = &cryptd_tfm->base;
 270         if (irq_fpu_usable() && (!in_atomic() ||
 271                                  !cryptd_aead_queued(cryptd_tfm)))
 272                 aead = cryptd_aead_child(cryptd_tfm);
 273
 274         aead_request_set_tfm(req, aead);
 275
 276         return crypto_aead_encrypt(req);
 277 }
 278
 279 static int cryptd_aegis256_aesni_decrypt(struct aead_request *req)
 280 {
 281         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 282         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 283         struct cryptd_aead *cryptd_tfm = *ctx;
 284
 285         aead = &cryptd_tfm->base;
 286         if (irq_fpu_usable() && (!in_atomic() ||
 287                                  !cryptd_aead_queued(cryptd_tfm)))
 288                 aead = cryptd_aead_child(cryptd_tfm);
 289
 290         aead_request_set_tfm(req, aead);
 291
 292         return crypto_aead_decrypt(req);
 293 }
 294
 295 static int cryptd_aegis256_aesni_init_tfm(struct crypto_aead *aead)
 296 {
 297         struct cryptd_aead *cryptd_tfm;
 298         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 299
 300         cryptd_tfm = cryptd_alloc_aead("__aegis256-aesni", CRYPTO_ALG_INTERNAL,
 301                                        CRYPTO_ALG_INTERNAL);
 302         if (IS_ERR(cryptd_tfm))
 303                 return PTR_ERR(cryptd_tfm);
 304
 305         *ctx = cryptd_tfm;
 306         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
 307         return 0;
 308 }
 309
 310 static void cryptd_aegis256_aesni_exit_tfm(struct crypto_aead *aead)
 311 {
 312         struct cryptd_aead **ctx = crypto_aead_ctx(aead);
 313
 314         cryptd_free_aead(*ctx);
 315 }
 316
 317 static struct aead_alg crypto_aegis256_aesni_alg[] = {
 318         {
 319                 .setkey = crypto_aegis256_aesni_setkey,
 320                 .setauthsize = crypto_aegis256_aesni_setauthsize,
 321                 .encrypt = crypto_aegis256_aesni_encrypt,
 322                 .decrypt = crypto_aegis256_aesni_decrypt,
 323                 .init = crypto_aegis256_aesni_init_tfm,
 324                 .exit = crypto_aegis256_aesni_exit_tfm,
 325
 326                 .ivsize = AEGIS256_NONCE_SIZE,
 327                 .maxauthsize = AEGIS256_MAX_AUTH_SIZE,
 328                 .chunksize = AEGIS256_BLOCK_SIZE,
 329
 330                 .base = {
 331                         .cra_flags = CRYPTO_ALG_INTERNAL,
 332                         .cra_blocksize = 1,
 333                         .cra_ctxsize = sizeof(struct aegis_ctx) +
 334                                 __alignof__(struct aegis_ctx),
 335                         .cra_alignmask = 0,
 336
 337                         .cra_name = "__aegis256",
 338                         .cra_driver_name = "__aegis256-aesni",
 339
 340                         .cra_module = THIS_MODULE,
 341                 }
 342         }, {
 343                 .setkey = cryptd_aegis256_aesni_setkey,
 344                 .setauthsize = cryptd_aegis256_aesni_setauthsize,
 345                 .encrypt = cryptd_aegis256_aesni_encrypt,
 346                 .decrypt = cryptd_aegis256_aesni_decrypt,
 347                 .init = cryptd_aegis256_aesni_init_tfm,
 348                 .exit = cryptd_aegis256_aesni_exit_tfm,
 349
 350                 .ivsize = AEGIS256_NONCE_SIZE,
 351                 .maxauthsize = AEGIS256_MAX_AUTH_SIZE,
 352                 .chunksize = AEGIS256_BLOCK_SIZE,
 353
 354                 .base = {
 355                         .cra_flags = CRYPTO_ALG_ASYNC,
 356                         .cra_blocksize = 1,
 357                         .cra_ctxsize = sizeof(struct cryptd_aead *),
 358                         .cra_alignmask = 0,
 359
 360                         .cra_priority = 400,
 361
 362                         .cra_name = "aegis256",
 363                         .cra_driver_name = "aegis256-aesni",
 364
 365                         .cra_module = THIS_MODULE,
 366                 }
 367         }
 368 };
 369
 370 static int __init crypto_aegis256_aesni_module_init(void)
 371 {
 372         if (!boot_cpu_has(X86_FEATURE_XMM2) ||
 373             !boot_cpu_has(X86_FEATURE_AES) ||
 374             !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
 375                 return -ENODEV;
 376
 377         return crypto_register_aeads(crypto_aegis256_aesni_alg,
 378                                     ARRAY_SIZE(crypto_aegis256_aesni_alg));
 379 }
 380
 381 static void __exit crypto_aegis256_aesni_module_exit(void)
 382 {
 383         crypto_unregister_aeads(crypto_aegis256_aesni_alg,
 384                                 ARRAY_SIZE(crypto_aegis256_aesni_alg));
 385 }
 386
 387 module_init(crypto_aegis256_aesni_module_init);
 388 module_exit(crypto_aegis256_aesni_module_exit);
 389
 390 MODULE_LICENSE("GPL");
 391 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
 392 MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm -- AESNI+SSE2 implementation");
 393 MODULE_ALIAS_CRYPTO("aegis256");
 394 MODULE_ALIAS_CRYPTO("aegis256-aesni");