linux/crypto/morus1280.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * The MORUS-1280 Authenticated-Encryption Algorithm
   4 *
   5 * Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com>
   6 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
   7 */
   8
   9#include <asm/unaligned.h>
  10#include <crypto/algapi.h>
  11#include <crypto/internal/aead.h>
  12#include <crypto/internal/skcipher.h>
  13#include <crypto/morus_common.h>
  14#include <crypto/scatterwalk.h>
  15#include <linux/err.h>
  16#include <linux/init.h>
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/scatterlist.h>
  20
  21#define MORUS1280_WORD_SIZE 8
  22#define MORUS1280_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS1280_WORD_SIZE)
  23#define MORUS1280_BLOCK_ALIGN (__alignof__(__le64))
  24#define MORUS1280_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS1280_BLOCK_ALIGN)
  25
  26struct morus1280_block {
  27        u64 words[MORUS_BLOCK_WORDS];
  28};
  29
  30union morus1280_block_in {
  31        __le64 words[MORUS_BLOCK_WORDS];
  32        u8 bytes[MORUS1280_BLOCK_SIZE];
  33};
  34
  35struct morus1280_state {
  36        struct morus1280_block s[MORUS_STATE_BLOCKS];
  37};
  38
  39struct morus1280_ctx {
  40        struct morus1280_block key;
  41};
  42
  43struct morus1280_ops {
  44        int (*skcipher_walk_init)(struct skcipher_walk *walk,
  45                                  struct aead_request *req, bool atomic);
  46
  47        void (*crypt_chunk)(struct morus1280_state *state,
  48                            u8 *dst, const u8 *src, unsigned int size);
  49};
  50
  51static const struct morus1280_block crypto_morus1280_const[1] = {
  52        { .words = {
  53                U64_C(0x0d08050302010100),
  54                U64_C(0x6279e99059372215),
  55                U64_C(0xf12fc26d55183ddb),
  56                U64_C(0xdd28b57342311120),
  57        } },
  58};
  59
  60static void crypto_morus1280_round(struct morus1280_block *b0,
  61                                   struct morus1280_block *b1,
  62                                   struct morus1280_block *b2,
  63                                   struct morus1280_block *b3,
  64                                   struct morus1280_block *b4,
  65                                   const struct morus1280_block *m,
  66                                   unsigned int b, unsigned int w)
  67{
  68        unsigned int i;
  69        struct morus1280_block tmp;
  70
  71        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
  72                b0->words[i] ^= b1->words[i] & b2->words[i];
  73                b0->words[i] ^= b3->words[i];
  74                b0->words[i] ^= m->words[i];
  75                b0->words[i] = rol64(b0->words[i], b);
  76        }
  77
  78        tmp = *b3;
  79        for (i = 0; i < MORUS_BLOCK_WORDS; i++)
  80                b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i];
  81}
  82
  83static void crypto_morus1280_update(struct morus1280_state *state,
  84                                    const struct morus1280_block *m)
  85{
  86        static const struct morus1280_block z = {};
  87
  88        struct morus1280_block *s = state->s;
  89
  90        crypto_morus1280_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 13, 1);
  91        crypto_morus1280_round(&s[1], &s[2], &s[3], &s[4], &s[0], m,  46, 2);
  92        crypto_morus1280_round(&s[2], &s[3], &s[4], &s[0], &s[1], m,  38, 3);
  93        crypto_morus1280_round(&s[3], &s[4], &s[0], &s[1], &s[2], m,   7, 2);
  94        crypto_morus1280_round(&s[4], &s[0], &s[1], &s[2], &s[3], m,   4, 1);
  95}
  96
  97static void crypto_morus1280_load_a(struct morus1280_block *dst, const u8 *src)
  98{
  99        unsigned int i;
 100        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
 101                dst->words[i] = le64_to_cpu(*(const __le64 *)src);
 102                src += MORUS1280_WORD_SIZE;
 103        }
 104}
 105
 106static void crypto_morus1280_load_u(struct morus1280_block *dst, const u8 *src)
 107{
 108        unsigned int i;
 109        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
 110                dst->words[i] = get_unaligned_le64(src);
 111                src += MORUS1280_WORD_SIZE;
 112        }
 113}
 114
 115static void crypto_morus1280_load(struct morus1280_block *dst, const u8 *src)
 116{
 117        if (MORUS1280_ALIGNED(src))
 118                crypto_morus1280_load_a(dst, src);
 119        else
 120                crypto_morus1280_load_u(dst, src);
 121}
 122
 123static void crypto_morus1280_store_a(u8 *dst, const struct morus1280_block *src)
 124{
 125        unsigned int i;
 126        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
 127                *(__le64 *)dst = cpu_to_le64(src->words[i]);
 128                dst += MORUS1280_WORD_SIZE;
 129        }
 130}
 131
 132static void crypto_morus1280_store_u(u8 *dst, const struct morus1280_block *src)
 133{
 134        unsigned int i;
 135        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
 136                put_unaligned_le64(src->words[i], dst);
 137                dst += MORUS1280_WORD_SIZE;
 138        }
 139}
 140
 141static void crypto_morus1280_store(u8 *dst, const struct morus1280_block *src)
 142{
 143        if (MORUS1280_ALIGNED(dst))
 144                crypto_morus1280_store_a(dst, src);
 145        else
 146                crypto_morus1280_store_u(dst, src);
 147}
 148
 149static void crypto_morus1280_ad(struct morus1280_state *state, const u8 *src,
 150                                unsigned int size)
 151{
 152        struct morus1280_block m;
 153
 154        if (MORUS1280_ALIGNED(src)) {
 155                while (size >= MORUS1280_BLOCK_SIZE) {
 156                        crypto_morus1280_load_a(&m, src);
 157                        crypto_morus1280_update(state, &m);
 158
 159                        size -= MORUS1280_BLOCK_SIZE;
 160                        src += MORUS1280_BLOCK_SIZE;
 161                }
 162        } else {
 163                while (size >= MORUS1280_BLOCK_SIZE) {
 164                        crypto_morus1280_load_u(&m, src);
 165                        crypto_morus1280_update(state, &m);
 166
 167                        size -= MORUS1280_BLOCK_SIZE;
 168                        src += MORUS1280_BLOCK_SIZE;
 169                }
 170        }
 171}
 172
 173static void crypto_morus1280_core(const struct morus1280_state *state,
 174                                  struct morus1280_block *blk)
 175{
 176        unsigned int i;
 177
 178        for (i = 0; i < MORUS_BLOCK_WORDS; i++)
 179                blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i];
 180
 181        for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
 182                blk->words[i] ^= state->s[0].words[i];
 183                blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i];
 184        }
 185}
 186
 187static void crypto_morus1280_encrypt_chunk(struct morus1280_state *state,
 188                                           u8 *dst, const u8 *src,
 189                                           unsigned int size)
 190{
 191        struct morus1280_block c, m;
 192
 193        if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
 194                while (size >= MORUS1280_BLOCK_SIZE) {
 195                        crypto_morus1280_load_a(&m, src);
 196                        c = m;
 197                        crypto_morus1280_core(state, &c);
 198                        crypto_morus1280_store_a(dst, &c);
 199                        crypto_morus1280_update(state, &m);
 200
 201                        src += MORUS1280_BLOCK_SIZE;
 202                        dst += MORUS1280_BLOCK_SIZE;
 203                        size -= MORUS1280_BLOCK_SIZE;
 204                }
 205        } else {
 206                while (size >= MORUS1280_BLOCK_SIZE) {
 207                        crypto_morus1280_load_u(&m, src);
 208                        c = m;
 209                        crypto_morus1280_core(state, &c);
 210                        crypto_morus1280_store_u(dst, &c);
 211                        crypto_morus1280_update(state, &m);
 212
 213                        src += MORUS1280_BLOCK_SIZE;
 214                        dst += MORUS1280_BLOCK_SIZE;
 215                        size -= MORUS1280_BLOCK_SIZE;
 216                }
 217        }
 218
 219        if (size > 0) {
 220                union morus1280_block_in tail;
 221
 222                memcpy(tail.bytes, src, size);
 223                memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
 224
 225                crypto_morus1280_load_a(&m, tail.bytes);
 226                c = m;
 227                crypto_morus1280_core(state, &c);
 228                crypto_morus1280_store_a(tail.bytes, &c);
 229                crypto_morus1280_update(state, &m);
 230
 231                memcpy(dst, tail.bytes, size);
 232        }
 233}
 234
 235static void crypto_morus1280_decrypt_chunk(struct morus1280_state *state,
 236                                           u8 *dst, const u8 *src,
 237                                           unsigned int size)
 238{
 239        struct morus1280_block m;
 240
 241        if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
 242                while (size >= MORUS1280_BLOCK_SIZE) {
 243                        crypto_morus1280_load_a(&m, src);
 244                        crypto_morus1280_core(state, &m);
 245                        crypto_morus1280_store_a(dst, &m);
 246                        crypto_morus1280_update(state, &m);
 247
 248                        src += MORUS1280_BLOCK_SIZE;
 249                        dst += MORUS1280_BLOCK_SIZE;
 250                        size -= MORUS1280_BLOCK_SIZE;
 251                }
 252        } else {
 253                while (size >= MORUS1280_BLOCK_SIZE) {
 254                        crypto_morus1280_load_u(&m, src);
 255                        crypto_morus1280_core(state, &m);
 256                        crypto_morus1280_store_u(dst, &m);
 257                        crypto_morus1280_update(state, &m);
 258
 259                        src += MORUS1280_BLOCK_SIZE;
 260                        dst += MORUS1280_BLOCK_SIZE;
 261                        size -= MORUS1280_BLOCK_SIZE;
 262                }
 263        }
 264
 265        if (size > 0) {
 266                union morus1280_block_in tail;
 267
 268                memcpy(tail.bytes, src, size);
 269                memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
 270
 271                crypto_morus1280_load_a(&m, tail.bytes);
 272                crypto_morus1280_core(state, &m);
 273                crypto_morus1280_store_a(tail.bytes, &m);
 274                memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
 275                crypto_morus1280_load_a(&m, tail.bytes);
 276                crypto_morus1280_update(state, &m);
 277
 278                memcpy(dst, tail.bytes, size);
 279        }
 280}
 281
 282static void crypto_morus1280_init(struct morus1280_state *state,
 283                                  const struct morus1280_block *key,
 284                                  const u8 *iv)
 285{
 286        static const struct morus1280_block z = {};
 287
 288        union morus1280_block_in tmp;
 289        unsigned int i;
 290
 291        memcpy(tmp.bytes, iv, MORUS_NONCE_SIZE);
 292        memset(tmp.bytes + MORUS_NONCE_SIZE, 0,
 293               MORUS1280_BLOCK_SIZE - MORUS_NONCE_SIZE);
 294
 295        crypto_morus1280_load(&state->s[0], tmp.bytes);
 296        state->s[1] = *key;
 297        for (i = 0; i < MORUS_BLOCK_WORDS; i++)
 298                state->s[2].words[i] = U64_C(0xFFFFFFFFFFFFFFFF);
 299        state->s[3] = z;
 300        state->s[4] = crypto_morus1280_const[0];
 301
 302        for (i = 0; i < 16; i++)
 303                crypto_morus1280_update(state, &z);
 304
 305        for (i = 0; i < MORUS_BLOCK_WORDS; i++)
 306                state->s[1].words[i] ^= key->words[i];
 307}
 308
 309static void crypto_morus1280_process_ad(struct morus1280_state *state,
 310                                        struct scatterlist *sg_src,
 311                                        unsigned int assoclen)
 312{
 313        struct scatter_walk walk;
 314        struct morus1280_block m;
 315        union morus1280_block_in buf;
 316        unsigned int pos = 0;
 317
 318        scatterwalk_start(&walk, sg_src);
 319        while (assoclen != 0) {
 320                unsigned int size = scatterwalk_clamp(&walk, assoclen);
 321                unsigned int left = size;
 322                void *mapped = scatterwalk_map(&walk);
 323                const u8 *src = (const u8 *)mapped;
 324
 325                if (pos + size >= MORUS1280_BLOCK_SIZE) {
 326                        if (pos > 0) {
 327                                unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
 328                                memcpy(buf.bytes + pos, src, fill);
 329
 330                                crypto_morus1280_load_a(&m, buf.bytes);
 331                                crypto_morus1280_update(state, &m);
 332
 333                                pos = 0;
 334                                left -= fill;
 335                                src += fill;
 336                        }
 337
 338                        crypto_morus1280_ad(state, src, left);
 339                        src += left & ~(MORUS1280_BLOCK_SIZE - 1);
 340                        left &= MORUS1280_BLOCK_SIZE - 1;
 341                }
 342
 343                memcpy(buf.bytes + pos, src, left);
 344
 345                pos += left;
 346                assoclen -= size;
 347                scatterwalk_unmap(mapped);
 348                scatterwalk_advance(&walk, size);
 349                scatterwalk_done(&walk, 0, assoclen);
 350        }
 351
 352        if (pos > 0) {
 353                memset(buf.bytes + pos, 0, MORUS1280_BLOCK_SIZE - pos);
 354
 355                crypto_morus1280_load_a(&m, buf.bytes);
 356                crypto_morus1280_update(state, &m);
 357        }
 358}
 359
 360static void crypto_morus1280_process_crypt(struct morus1280_state *state,
 361                                           struct aead_request *req,
 362                                           const struct morus1280_ops *ops)
 363{
 364        struct skcipher_walk walk;
 365
 366        ops->skcipher_walk_init(&walk, req, false);
 367
 368        while (walk.nbytes) {
 369                unsigned int nbytes = walk.nbytes;
 370
 371                if (nbytes < walk.total)
 372                        nbytes = round_down(nbytes, walk.stride);
 373
 374                ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
 375                                 nbytes);
 376
 377                skcipher_walk_done(&walk, walk.nbytes - nbytes);
 378        }
 379}
 380
 381static void crypto_morus1280_final(struct morus1280_state *state,
 382                                   struct morus1280_block *tag_xor,
 383                                   u64 assoclen, u64 cryptlen)
 384{
 385        struct morus1280_block tmp;
 386        unsigned int i;
 387
 388        tmp.words[0] = assoclen * 8;
 389        tmp.words[1] = cryptlen * 8;
 390        tmp.words[2] = 0;
 391        tmp.words[3] = 0;
 392
 393        for (i = 0; i < MORUS_BLOCK_WORDS; i++)
 394                state->s[4].words[i] ^= state->s[0].words[i];
 395
 396        for (i = 0; i < 10; i++)
 397                crypto_morus1280_update(state, &tmp);
 398
 399        crypto_morus1280_core(state, tag_xor);
 400}
 401
 402static int crypto_morus1280_setkey(struct crypto_aead *aead, const u8 *key,
 403                                   unsigned int keylen)
 404{
 405        struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
 406        union morus1280_block_in tmp;
 407
 408        if (keylen == MORUS1280_BLOCK_SIZE)
 409                crypto_morus1280_load(&ctx->key, key);
 410        else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
 411                memcpy(tmp.bytes, key, keylen);
 412                memcpy(tmp.bytes + keylen, key, keylen);
 413
 414                crypto_morus1280_load(&ctx->key, tmp.bytes);
 415        } else {
 416                crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
 417                return -EINVAL;
 418        }
 419
 420        return 0;
 421}
 422
 423static int crypto_morus1280_setauthsize(struct crypto_aead *tfm,
 424                                        unsigned int authsize)
 425{
 426        return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
 427}
 428
 429static void crypto_morus1280_crypt(struct aead_request *req,
 430                                   struct morus1280_block *tag_xor,
 431                                   unsigned int cryptlen,
 432                                   const struct morus1280_ops *ops)
 433{
 434        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 435        struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
 436        struct morus1280_state state;
 437
 438        crypto_morus1280_init(&state, &ctx->key, req->iv);
 439        crypto_morus1280_process_ad(&state, req->src, req->assoclen);
 440        crypto_morus1280_process_crypt(&state, req, ops);
 441        crypto_morus1280_final(&state, tag_xor, req->assoclen, cryptlen);
 442}
 443
 444static int crypto_morus1280_encrypt(struct aead_request *req)
 445{
 446        static const struct morus1280_ops ops = {
 447                .skcipher_walk_init = skcipher_walk_aead_encrypt,
 448                .crypt_chunk = crypto_morus1280_encrypt_chunk,
 449        };
 450
 451        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 452        struct morus1280_block tag = {};
 453        union morus1280_block_in tag_out;
 454        unsigned int authsize = crypto_aead_authsize(tfm);
 455        unsigned int cryptlen = req->cryptlen;
 456
 457        crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
 458        crypto_morus1280_store(tag_out.bytes, &tag);
 459
 460        scatterwalk_map_and_copy(tag_out.bytes, req->dst,
 461                                 req->assoclen + cryptlen, authsize, 1);
 462        return 0;
 463}
 464
 465static int crypto_morus1280_decrypt(struct aead_request *req)
 466{
 467        static const struct morus1280_ops ops = {
 468                .skcipher_walk_init = skcipher_walk_aead_decrypt,
 469                .crypt_chunk = crypto_morus1280_decrypt_chunk,
 470        };
 471        static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
 472
 473        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 474        union morus1280_block_in tag_in;
 475        struct morus1280_block tag;
 476        unsigned int authsize = crypto_aead_authsize(tfm);
 477        unsigned int cryptlen = req->cryptlen - authsize;
 478
 479        scatterwalk_map_and_copy(tag_in.bytes, req->src,
 480                                 req->assoclen + cryptlen, authsize, 0);
 481
 482        crypto_morus1280_load(&tag, tag_in.bytes);
 483        crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
 484        crypto_morus1280_store(tag_in.bytes, &tag);
 485
 486        return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
 487}
 488
 489static int crypto_morus1280_init_tfm(struct crypto_aead *tfm)
 490{
 491        return 0;
 492}
 493
 494static void crypto_morus1280_exit_tfm(struct crypto_aead *tfm)
 495{
 496}
 497
 498static struct aead_alg crypto_morus1280_alg = {
 499        .setkey = crypto_morus1280_setkey,
 500        .setauthsize = crypto_morus1280_setauthsize,
 501        .encrypt = crypto_morus1280_encrypt,
 502        .decrypt = crypto_morus1280_decrypt,
 503        .init = crypto_morus1280_init_tfm,
 504        .exit = crypto_morus1280_exit_tfm,
 505
 506        .ivsize = MORUS_NONCE_SIZE,
 507        .maxauthsize = MORUS_MAX_AUTH_SIZE,
 508        .chunksize = MORUS1280_BLOCK_SIZE,
 509
 510        .base = {
 511                .cra_blocksize = 1,
 512                .cra_ctxsize = sizeof(struct morus1280_ctx),
 513                .cra_alignmask = 0,
 514
 515                .cra_priority = 100,
 516
 517                .cra_name = "morus1280",
 518                .cra_driver_name = "morus1280-generic",
 519
 520                .cra_module = THIS_MODULE,
 521        }
 522};
 523
 524
 525static int __init crypto_morus1280_module_init(void)
 526{
 527        return crypto_register_aead(&crypto_morus1280_alg);
 528}
 529
 530static void __exit crypto_morus1280_module_exit(void)
 531{
 532        crypto_unregister_aead(&crypto_morus1280_alg);
 533}
 534
 535module_init(crypto_morus1280_module_init);
 536module_exit(crypto_morus1280_module_exit);
 537
 538MODULE_LICENSE("GPL");
 539MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
 540MODULE_DESCRIPTION("MORUS-1280 AEAD algorithm");
 541MODULE_ALIAS_CRYPTO("morus1280");
 542MODULE_ALIAS_CRYPTO("morus1280-generic");
 543