arch/s390/crypto/aes_s390.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * s390 implementation of the AES Cipher Algorithm.
   5  *
   6  * s390 Version:
   7  *   Copyright IBM Corp. 2005, 2007
   8  *   Author(s): Jan Glauber (jang@de.ibm.com)
   9  *              Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
  10  *
  11  * Derived from "crypto/aes_generic.c"
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 2 of the License, or (at your option)
  16  * any later version.
  17  *
  18  */
  19
  20 #define KMSG_COMPONENT "aes_s390"
  21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  22
  23 #include <crypto/aes.h>
  24 #include <crypto/algapi.h>
  25 #include <linux/err.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include "crypt_s390.h"
  29
  30 #define AES_KEYLEN_128          1
  31 #define AES_KEYLEN_192          2
  32 #define AES_KEYLEN_256          4
  33
  34 static u8 *ctrblk;
  35 static char keylen_flag;
  36
  37 struct s390_aes_ctx {
  38         u8 iv[AES_BLOCK_SIZE];
  39         u8 key[AES_MAX_KEY_SIZE];
  40         long enc;
  41         long dec;
  42         int key_len;
  43         union {
  44                 struct crypto_blkcipher *blk;
  45                 struct crypto_cipher *cip;
  46         } fallback;
  47 };
  48
  49 struct pcc_param {
  50         u8 key[32];
  51         u8 tweak[16];
  52         u8 block[16];
  53         u8 bit[16];
  54         u8 xts[16];
  55 };
  56
  57 struct s390_xts_ctx {
  58         u8 key[32];
  59         u8 xts_param[16];
  60         struct pcc_param pcc;
  61         long enc;
  62         long dec;
  63         int key_len;
  64         struct crypto_blkcipher *fallback;
  65 };
  66
  67 /*
  68  * Check if the key_len is supported by the HW.
  69  * Returns 0 if it is, a positive number if it is not and software fallback is
  70  * required or a negative number in case the key size is not valid
  71  */
  72 static int need_fallback(unsigned int key_len)
  73 {
  74         switch (key_len) {
  75         case 16:
  76                 if (!(keylen_flag & AES_KEYLEN_128))
  77                         return 1;
  78                 break;
  79         case 24:
  80                 if (!(keylen_flag & AES_KEYLEN_192))
  81                         return 1;
  82                 break;
  83         case 32:
  84                 if (!(keylen_flag & AES_KEYLEN_256))
  85                         return 1;
  86                 break;
  87         default:
  88                 return -1;
  89                 break;
  90         }
  91         return 0;
  92 }
  93
  94 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
  95                 unsigned int key_len)
  96 {
  97         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
  98         int ret;
  99
 100         sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
 101         sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
 102                         CRYPTO_TFM_REQ_MASK);
 103
 104         ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
 105         if (ret) {
 106                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 107                 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
 108                                 CRYPTO_TFM_RES_MASK);
 109         }
 110         return ret;
 111 }
 112
 113 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 114                        unsigned int key_len)
 115 {
 116         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 117         u32 *flags = &tfm->crt_flags;
 118         int ret;
 119
 120         ret = need_fallback(key_len);
 121         if (ret < 0) {
 122                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 123                 return -EINVAL;
 124         }
 125
 126         sctx->key_len = key_len;
 127         if (!ret) {
 128                 memcpy(sctx->key, in_key, key_len);
 129                 return 0;
 130         }
 131
 132         return setkey_fallback_cip(tfm, in_key, key_len);
 133 }
 134
 135 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 136 {
 137         const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 138
 139         if (unlikely(need_fallback(sctx->key_len))) {
 140                 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
 141                 return;
 142         }
 143
 144         switch (sctx->key_len) {
 145         case 16:
 146                 crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
 147                               AES_BLOCK_SIZE);
 148                 break;
 149         case 24:
 150                 crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
 151                               AES_BLOCK_SIZE);
 152                 break;
 153         case 32:
 154                 crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
 155                               AES_BLOCK_SIZE);
 156                 break;
 157         }
 158 }
 159
 160 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 161 {
 162         const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 163
 164         if (unlikely(need_fallback(sctx->key_len))) {
 165                 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
 166                 return;
 167         }
 168
 169         switch (sctx->key_len) {
 170         case 16:
 171                 crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
 172                               AES_BLOCK_SIZE);
 173                 break;
 174         case 24:
 175                 crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
 176                               AES_BLOCK_SIZE);
 177                 break;
 178         case 32:
 179                 crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
 180                               AES_BLOCK_SIZE);
 181                 break;
 182         }
 183 }
 184
 185 static int fallback_init_cip(struct crypto_tfm *tfm)
 186 {
 187         const char *name = tfm->__crt_alg->cra_name;
 188         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 189
 190         sctx->fallback.cip = crypto_alloc_cipher(name, 0,
 191                         CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
 192
 193         if (IS_ERR(sctx->fallback.cip)) {
 194                 pr_err("Allocating AES fallback algorithm %s failed\n",
 195                        name);
 196                 return PTR_ERR(sctx->fallback.cip);
 197         }
 198
 199         return 0;
 200 }
 201
 202 static void fallback_exit_cip(struct crypto_tfm *tfm)
 203 {
 204         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 205
 206         crypto_free_cipher(sctx->fallback.cip);
 207         sctx->fallback.cip = NULL;
 208 }
 209
 210 static struct crypto_alg aes_alg = {
 211         .cra_name               =       "aes",
 212         .cra_driver_name        =       "aes-s390",
 213         .cra_priority           =       CRYPT_S390_PRIORITY,
 214         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER |
 215                                         CRYPTO_ALG_NEED_FALLBACK,
 216         .cra_blocksize          =       AES_BLOCK_SIZE,
 217         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 218         .cra_module             =       THIS_MODULE,
 219         .cra_init               =       fallback_init_cip,
 220         .cra_exit               =       fallback_exit_cip,
 221         .cra_u                  =       {
 222                 .cipher = {
 223                         .cia_min_keysize        =       AES_MIN_KEY_SIZE,
 224                         .cia_max_keysize        =       AES_MAX_KEY_SIZE,
 225                         .cia_setkey             =       aes_set_key,
 226                         .cia_encrypt            =       aes_encrypt,
 227                         .cia_decrypt            =       aes_decrypt,
 228                 }
 229         }
 230 };
 231
 232 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
 233                 unsigned int len)
 234 {
 235         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 236         unsigned int ret;
 237
 238         sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
 239         sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
 240                         CRYPTO_TFM_REQ_MASK);
 241
 242         ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
 243         if (ret) {
 244                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 245                 tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
 246                                 CRYPTO_TFM_RES_MASK);
 247         }
 248         return ret;
 249 }
 250
 251 static int fallback_blk_dec(struct blkcipher_desc *desc,
 252                 struct scatterlist *dst, struct scatterlist *src,
 253                 unsigned int nbytes)
 254 {
 255         unsigned int ret;
 256         struct crypto_blkcipher *tfm;
 257         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 258
 259         tfm = desc->tfm;
 260         desc->tfm = sctx->fallback.blk;
 261
 262         ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
 263
 264         desc->tfm = tfm;
 265         return ret;
 266 }
 267
 268 static int fallback_blk_enc(struct blkcipher_desc *desc,
 269                 struct scatterlist *dst, struct scatterlist *src,
 270                 unsigned int nbytes)
 271 {
 272         unsigned int ret;
 273         struct crypto_blkcipher *tfm;
 274         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 275
 276         tfm = desc->tfm;
 277         desc->tfm = sctx->fallback.blk;
 278
 279         ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
 280
 281         desc->tfm = tfm;
 282         return ret;
 283 }
 284
 285 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 286                            unsigned int key_len)
 287 {
 288         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 289         int ret;
 290
 291         ret = need_fallback(key_len);
 292         if (ret > 0) {
 293                 sctx->key_len = key_len;
 294                 return setkey_fallback_blk(tfm, in_key, key_len);
 295         }
 296
 297         switch (key_len) {
 298         case 16:
 299                 sctx->enc = KM_AES_128_ENCRYPT;
 300                 sctx->dec = KM_AES_128_DECRYPT;
 301                 break;
 302         case 24:
 303                 sctx->enc = KM_AES_192_ENCRYPT;
 304                 sctx->dec = KM_AES_192_DECRYPT;
 305                 break;
 306         case 32:
 307                 sctx->enc = KM_AES_256_ENCRYPT;
 308                 sctx->dec = KM_AES_256_DECRYPT;
 309                 break;
 310         }
 311
 312         return aes_set_key(tfm, in_key, key_len);
 313 }
 314
 315 static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
 316                          struct blkcipher_walk *walk)
 317 {
 318         int ret = blkcipher_walk_virt(desc, walk);
 319         unsigned int nbytes;
 320
 321         while ((nbytes = walk->nbytes)) {
 322                 /* only use complete blocks */
 323                 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
 324                 u8 *out = walk->dst.virt.addr;
 325                 u8 *in = walk->src.virt.addr;
 326
 327                 ret = crypt_s390_km(func, param, out, in, n);
 328                 if (ret < 0 || ret != n)
 329                         return -EIO;
 330
 331                 nbytes &= AES_BLOCK_SIZE - 1;
 332                 ret = blkcipher_walk_done(desc, walk, nbytes);
 333         }
 334
 335         return ret;
 336 }
 337
 338 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
 339                            struct scatterlist *dst, struct scatterlist *src,
 340                            unsigned int nbytes)
 341 {
 342         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 343         struct blkcipher_walk walk;
 344
 345         if (unlikely(need_fallback(sctx->key_len)))
 346                 return fallback_blk_enc(desc, dst, src, nbytes);
 347
 348         blkcipher_walk_init(&walk, dst, src, nbytes);
 349         return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
 350 }
 351
 352 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
 353                            struct scatterlist *dst, struct scatterlist *src,
 354                            unsigned int nbytes)
 355 {
 356         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 357         struct blkcipher_walk walk;
 358
 359         if (unlikely(need_fallback(sctx->key_len)))
 360                 return fallback_blk_dec(desc, dst, src, nbytes);
 361
 362         blkcipher_walk_init(&walk, dst, src, nbytes);
 363         return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
 364 }
 365
 366 static int fallback_init_blk(struct crypto_tfm *tfm)
 367 {
 368         const char *name = tfm->__crt_alg->cra_name;
 369         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 370
 371         sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
 372                         CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
 373
 374         if (IS_ERR(sctx->fallback.blk)) {
 375                 pr_err("Allocating AES fallback algorithm %s failed\n",
 376                        name);
 377                 return PTR_ERR(sctx->fallback.blk);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static void fallback_exit_blk(struct crypto_tfm *tfm)
 384 {
 385         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 386
 387         crypto_free_blkcipher(sctx->fallback.blk);
 388         sctx->fallback.blk = NULL;
 389 }
 390
 391 static struct crypto_alg ecb_aes_alg = {
 392         .cra_name               =       "ecb(aes)",
 393         .cra_driver_name        =       "ecb-aes-s390",
 394         .cra_priority           =       CRYPT_S390_COMPOSITE_PRIORITY,
 395         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 396                                         CRYPTO_ALG_NEED_FALLBACK,
 397         .cra_blocksize          =       AES_BLOCK_SIZE,
 398         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 399         .cra_type               =       &crypto_blkcipher_type,
 400         .cra_module             =       THIS_MODULE,
 401         .cra_init               =       fallback_init_blk,
 402         .cra_exit               =       fallback_exit_blk,
 403         .cra_u                  =       {
 404                 .blkcipher = {
 405                         .min_keysize            =       AES_MIN_KEY_SIZE,
 406                         .max_keysize            =       AES_MAX_KEY_SIZE,
 407                         .setkey                 =       ecb_aes_set_key,
 408                         .encrypt                =       ecb_aes_encrypt,
 409                         .decrypt                =       ecb_aes_decrypt,
 410                 }
 411         }
 412 };
 413
 414 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 415                            unsigned int key_len)
 416 {
 417         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 418         int ret;
 419
 420         ret = need_fallback(key_len);
 421         if (ret > 0) {
 422                 sctx->key_len = key_len;
 423                 return setkey_fallback_blk(tfm, in_key, key_len);
 424         }
 425
 426         switch (key_len) {
 427         case 16:
 428                 sctx->enc = KMC_AES_128_ENCRYPT;
 429                 sctx->dec = KMC_AES_128_DECRYPT;
 430                 break;
 431         case 24:
 432                 sctx->enc = KMC_AES_192_ENCRYPT;
 433                 sctx->dec = KMC_AES_192_DECRYPT;
 434                 break;
 435         case 32:
 436                 sctx->enc = KMC_AES_256_ENCRYPT;
 437                 sctx->dec = KMC_AES_256_DECRYPT;
 438                 break;
 439         }
 440
 441         return aes_set_key(tfm, in_key, key_len);
 442 }
 443
 444 static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
 445                          struct blkcipher_walk *walk)
 446 {
 447         int ret = blkcipher_walk_virt(desc, walk);
 448         unsigned int nbytes = walk->nbytes;
 449
 450         if (!nbytes)
 451                 goto out;
 452
 453         memcpy(param, walk->iv, AES_BLOCK_SIZE);
 454         do {
 455                 /* only use complete blocks */
 456                 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
 457                 u8 *out = walk->dst.virt.addr;
 458                 u8 *in = walk->src.virt.addr;
 459
 460                 ret = crypt_s390_kmc(func, param, out, in, n);
 461                 if (ret < 0 || ret != n)
 462                         return -EIO;
 463
 464                 nbytes &= AES_BLOCK_SIZE - 1;
 465                 ret = blkcipher_walk_done(desc, walk, nbytes);
 466         } while ((nbytes = walk->nbytes));
 467         memcpy(walk->iv, param, AES_BLOCK_SIZE);
 468
 469 out:
 470         return ret;
 471 }
 472
 473 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
 474                            struct scatterlist *dst, struct scatterlist *src,
 475                            unsigned int nbytes)
 476 {
 477         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 478         struct blkcipher_walk walk;
 479
 480         if (unlikely(need_fallback(sctx->key_len)))
 481                 return fallback_blk_enc(desc, dst, src, nbytes);
 482
 483         blkcipher_walk_init(&walk, dst, src, nbytes);
 484         return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
 485 }
 486
 487 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
 488                            struct scatterlist *dst, struct scatterlist *src,
 489                            unsigned int nbytes)
 490 {
 491         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 492         struct blkcipher_walk walk;
 493
 494         if (unlikely(need_fallback(sctx->key_len)))
 495                 return fallback_blk_dec(desc, dst, src, nbytes);
 496
 497         blkcipher_walk_init(&walk, dst, src, nbytes);
 498         return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
 499 }
 500
 501 static struct crypto_alg cbc_aes_alg = {
 502         .cra_name               =       "cbc(aes)",
 503         .cra_driver_name        =       "cbc-aes-s390",
 504         .cra_priority           =       CRYPT_S390_COMPOSITE_PRIORITY,
 505         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 506                                         CRYPTO_ALG_NEED_FALLBACK,
 507         .cra_blocksize          =       AES_BLOCK_SIZE,
 508         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 509         .cra_type               =       &crypto_blkcipher_type,
 510         .cra_module             =       THIS_MODULE,
 511         .cra_init               =       fallback_init_blk,
 512         .cra_exit               =       fallback_exit_blk,
 513         .cra_u                  =       {
 514                 .blkcipher = {
 515                         .min_keysize            =       AES_MIN_KEY_SIZE,
 516                         .max_keysize            =       AES_MAX_KEY_SIZE,
 517                         .ivsize                 =       AES_BLOCK_SIZE,
 518                         .setkey                 =       cbc_aes_set_key,
 519                         .encrypt                =       cbc_aes_encrypt,
 520                         .decrypt                =       cbc_aes_decrypt,
 521                 }
 522         }
 523 };
 524
 525 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
 526                                    unsigned int len)
 527 {
 528         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 529         unsigned int ret;
 530
 531         xts_ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
 532         xts_ctx->fallback->base.crt_flags |= (tfm->crt_flags &
 533                         CRYPTO_TFM_REQ_MASK);
 534
 535         ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len);
 536         if (ret) {
 537                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 538                 tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags &
 539                                 CRYPTO_TFM_RES_MASK);
 540         }
 541         return ret;
 542 }
 543
 544 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
 545                 struct scatterlist *dst, struct scatterlist *src,
 546                 unsigned int nbytes)
 547 {
 548         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 549         struct crypto_blkcipher *tfm;
 550         unsigned int ret;
 551
 552         tfm = desc->tfm;
 553         desc->tfm = xts_ctx->fallback;
 554
 555         ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
 556
 557         desc->tfm = tfm;
 558         return ret;
 559 }
 560
 561 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
 562                 struct scatterlist *dst, struct scatterlist *src,
 563                 unsigned int nbytes)
 564 {
 565         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 566         struct crypto_blkcipher *tfm;
 567         unsigned int ret;
 568
 569         tfm = desc->tfm;
 570         desc->tfm = xts_ctx->fallback;
 571
 572         ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
 573
 574         desc->tfm = tfm;
 575         return ret;
 576 }
 577
 578 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 579                            unsigned int key_len)
 580 {
 581         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 582         u32 *flags = &tfm->crt_flags;
 583
 584         switch (key_len) {
 585         case 32:
 586                 xts_ctx->enc = KM_XTS_128_ENCRYPT;
 587                 xts_ctx->dec = KM_XTS_128_DECRYPT;
 588                 memcpy(xts_ctx->key + 16, in_key, 16);
 589                 memcpy(xts_ctx->pcc.key + 16, in_key + 16, 16);
 590                 break;
 591         case 48:
 592                 xts_ctx->enc = 0;
 593                 xts_ctx->dec = 0;
 594                 xts_fallback_setkey(tfm, in_key, key_len);
 595                 break;
 596         case 64:
 597                 xts_ctx->enc = KM_XTS_256_ENCRYPT;
 598                 xts_ctx->dec = KM_XTS_256_DECRYPT;
 599                 memcpy(xts_ctx->key, in_key, 32);
 600                 memcpy(xts_ctx->pcc.key, in_key + 32, 32);
 601                 break;
 602         default:
 603                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 604                 return -EINVAL;
 605         }
 606         xts_ctx->key_len = key_len;
 607         return 0;
 608 }
 609
 610 static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
 611                          struct s390_xts_ctx *xts_ctx,
 612                          struct blkcipher_walk *walk)
 613 {
 614         unsigned int offset = (xts_ctx->key_len >> 1) & 0x10;
 615         int ret = blkcipher_walk_virt(desc, walk);
 616         unsigned int nbytes = walk->nbytes;
 617         unsigned int n;
 618         u8 *in, *out;
 619         void *param;
 620
 621         if (!nbytes)
 622                 goto out;
 623
 624         memset(xts_ctx->pcc.block, 0, sizeof(xts_ctx->pcc.block));
 625         memset(xts_ctx->pcc.bit, 0, sizeof(xts_ctx->pcc.bit));
 626         memset(xts_ctx->pcc.xts, 0, sizeof(xts_ctx->pcc.xts));
 627         memcpy(xts_ctx->pcc.tweak, walk->iv, sizeof(xts_ctx->pcc.tweak));
 628         param = xts_ctx->pcc.key + offset;
 629         ret = crypt_s390_pcc(func, param);
 630         if (ret < 0)
 631                 return -EIO;
 632
 633         memcpy(xts_ctx->xts_param, xts_ctx->pcc.xts, 16);
 634         param = xts_ctx->key + offset;
 635         do {
 636                 /* only use complete blocks */
 637                 n = nbytes & ~(AES_BLOCK_SIZE - 1);
 638                 out = walk->dst.virt.addr;
 639                 in = walk->src.virt.addr;
 640
 641                 ret = crypt_s390_km(func, param, out, in, n);
 642                 if (ret < 0 || ret != n)
 643                         return -EIO;
 644
 645                 nbytes &= AES_BLOCK_SIZE - 1;
 646                 ret = blkcipher_walk_done(desc, walk, nbytes);
 647         } while ((nbytes = walk->nbytes));
 648 out:
 649         return ret;
 650 }
 651
 652 static int xts_aes_encrypt(struct blkcipher_desc *desc,
 653                            struct scatterlist *dst, struct scatterlist *src,
 654                            unsigned int nbytes)
 655 {
 656         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 657         struct blkcipher_walk walk;
 658
 659         if (unlikely(xts_ctx->key_len == 48))
 660                 return xts_fallback_encrypt(desc, dst, src, nbytes);
 661
 662         blkcipher_walk_init(&walk, dst, src, nbytes);
 663         return xts_aes_crypt(desc, xts_ctx->enc, xts_ctx, &walk);
 664 }
 665
 666 static int xts_aes_decrypt(struct blkcipher_desc *desc,
 667                            struct scatterlist *dst, struct scatterlist *src,
 668                            unsigned int nbytes)
 669 {
 670         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 671         struct blkcipher_walk walk;
 672
 673         if (unlikely(xts_ctx->key_len == 48))
 674                 return xts_fallback_decrypt(desc, dst, src, nbytes);
 675
 676         blkcipher_walk_init(&walk, dst, src, nbytes);
 677         return xts_aes_crypt(desc, xts_ctx->dec, xts_ctx, &walk);
 678 }
 679
 680 static int xts_fallback_init(struct crypto_tfm *tfm)
 681 {
 682         const char *name = tfm->__crt_alg->cra_name;
 683         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 684
 685         xts_ctx->fallback = crypto_alloc_blkcipher(name, 0,
 686                         CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
 687
 688         if (IS_ERR(xts_ctx->fallback)) {
 689                 pr_err("Allocating XTS fallback algorithm %s failed\n",
 690                        name);
 691                 return PTR_ERR(xts_ctx->fallback);
 692         }
 693         return 0;
 694 }
 695
 696 static void xts_fallback_exit(struct crypto_tfm *tfm)
 697 {
 698         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 699
 700         crypto_free_blkcipher(xts_ctx->fallback);
 701         xts_ctx->fallback = NULL;
 702 }
 703
 704 static struct crypto_alg xts_aes_alg = {
 705         .cra_name               =       "xts(aes)",
 706         .cra_driver_name        =       "xts-aes-s390",
 707         .cra_priority           =       CRYPT_S390_COMPOSITE_PRIORITY,
 708         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 709                                         CRYPTO_ALG_NEED_FALLBACK,
 710         .cra_blocksize          =       AES_BLOCK_SIZE,
 711         .cra_ctxsize            =       sizeof(struct s390_xts_ctx),
 712         .cra_type               =       &crypto_blkcipher_type,
 713         .cra_module             =       THIS_MODULE,
 714         .cra_init               =       xts_fallback_init,
 715         .cra_exit               =       xts_fallback_exit,
 716         .cra_u                  =       {
 717                 .blkcipher = {
 718                         .min_keysize            =       2 * AES_MIN_KEY_SIZE,
 719                         .max_keysize            =       2 * AES_MAX_KEY_SIZE,
 720                         .ivsize                 =       AES_BLOCK_SIZE,
 721                         .setkey                 =       xts_aes_set_key,
 722                         .encrypt                =       xts_aes_encrypt,
 723                         .decrypt                =       xts_aes_decrypt,
 724                 }
 725         }
 726 };
 727
 728 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 729                            unsigned int key_len)
 730 {
 731         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 732
 733         switch (key_len) {
 734         case 16:
 735                 sctx->enc = KMCTR_AES_128_ENCRYPT;
 736                 sctx->dec = KMCTR_AES_128_DECRYPT;
 737                 break;
 738         case 24:
 739                 sctx->enc = KMCTR_AES_192_ENCRYPT;
 740                 sctx->dec = KMCTR_AES_192_DECRYPT;
 741                 break;
 742         case 32:
 743                 sctx->enc = KMCTR_AES_256_ENCRYPT;
 744                 sctx->dec = KMCTR_AES_256_DECRYPT;
 745                 break;
 746         }
 747
 748         return aes_set_key(tfm, in_key, key_len);
 749 }
 750
 751 static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
 752                          struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
 753 {
 754         int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
 755         unsigned int i, n, nbytes;
 756         u8 buf[AES_BLOCK_SIZE];
 757         u8 *out, *in;
 758
 759         if (!walk->nbytes)
 760                 return ret;
 761
 762         memcpy(ctrblk, walk->iv, AES_BLOCK_SIZE);
 763         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 764                 out = walk->dst.virt.addr;
 765                 in = walk->src.virt.addr;
 766                 while (nbytes >= AES_BLOCK_SIZE) {
 767                         /* only use complete blocks, max. PAGE_SIZE */
 768                         n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
 769                                                  nbytes & ~(AES_BLOCK_SIZE - 1);
 770                         for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
 771                                 memcpy(ctrblk + i, ctrblk + i - AES_BLOCK_SIZE,
 772                                        AES_BLOCK_SIZE);
 773                                 crypto_inc(ctrblk + i, AES_BLOCK_SIZE);
 774                         }
 775                         ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);
 776                         if (ret < 0 || ret != n)
 777                                 return -EIO;
 778                         if (n > AES_BLOCK_SIZE)
 779                                 memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,
 780                                        AES_BLOCK_SIZE);
 781                         crypto_inc(ctrblk, AES_BLOCK_SIZE);
 782                         out += n;
 783                         in += n;
 784                         nbytes -= n;
 785                 }
 786                 ret = blkcipher_walk_done(desc, walk, nbytes);
 787         }
 788         /*
 789          * final block may be < AES_BLOCK_SIZE, copy only nbytes
 790          */
 791         if (nbytes) {
 792                 out = walk->dst.virt.addr;
 793                 in = walk->src.virt.addr;
 794                 ret = crypt_s390_kmctr(func, sctx->key, buf, in,
 795                                        AES_BLOCK_SIZE, ctrblk);
 796                 if (ret < 0 || ret != AES_BLOCK_SIZE)
 797                         return -EIO;
 798                 memcpy(out, buf, nbytes);
 799                 crypto_inc(ctrblk, AES_BLOCK_SIZE);
 800                 ret = blkcipher_walk_done(desc, walk, 0);
 801         }
 802         memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE);
 803         return ret;
 804 }
 805
 806 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
 807                            struct scatterlist *dst, struct scatterlist *src,
 808                            unsigned int nbytes)
 809 {
 810         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 811         struct blkcipher_walk walk;
 812
 813         blkcipher_walk_init(&walk, dst, src, nbytes);
 814         return ctr_aes_crypt(desc, sctx->enc, sctx, &walk);
 815 }
 816
 817 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
 818                            struct scatterlist *dst, struct scatterlist *src,
 819                            unsigned int nbytes)
 820 {
 821         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 822         struct blkcipher_walk walk;
 823
 824         blkcipher_walk_init(&walk, dst, src, nbytes);
 825         return ctr_aes_crypt(desc, sctx->dec, sctx, &walk);
 826 }
 827
 828 static struct crypto_alg ctr_aes_alg = {
 829         .cra_name               =       "ctr(aes)",
 830         .cra_driver_name        =       "ctr-aes-s390",
 831         .cra_priority           =       CRYPT_S390_COMPOSITE_PRIORITY,
 832         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 833         .cra_blocksize          =       1,
 834         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 835         .cra_type               =       &crypto_blkcipher_type,
 836         .cra_module             =       THIS_MODULE,
 837         .cra_u                  =       {
 838                 .blkcipher = {
 839                         .min_keysize            =       AES_MIN_KEY_SIZE,
 840                         .max_keysize            =       AES_MAX_KEY_SIZE,
 841                         .ivsize                 =       AES_BLOCK_SIZE,
 842                         .setkey                 =       ctr_aes_set_key,
 843                         .encrypt                =       ctr_aes_encrypt,
 844                         .decrypt                =       ctr_aes_decrypt,
 845                 }
 846         }
 847 };
 848
 849 static int __init aes_s390_init(void)
 850 {
 851         int ret;
 852
 853         if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
 854                 keylen_flag |= AES_KEYLEN_128;
 855         if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
 856                 keylen_flag |= AES_KEYLEN_192;
 857         if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
 858                 keylen_flag |= AES_KEYLEN_256;
 859
 860         if (!keylen_flag)
 861                 return -EOPNOTSUPP;
 862
 863         /* z9 109 and z9 BC/EC only support 128 bit key length */
 864         if (keylen_flag == AES_KEYLEN_128)
 865                 pr_info("AES hardware acceleration is only available for"
 866                         " 128-bit keys\n");
 867
 868         ret = crypto_register_alg(&aes_alg);
 869         if (ret)
 870                 goto aes_err;
 871
 872         ret = crypto_register_alg(&ecb_aes_alg);
 873         if (ret)
 874                 goto ecb_aes_err;
 875
 876         ret = crypto_register_alg(&cbc_aes_alg);
 877         if (ret)
 878                 goto cbc_aes_err;
 879
 880         if (crypt_s390_func_available(KM_XTS_128_ENCRYPT,
 881                         CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
 882             crypt_s390_func_available(KM_XTS_256_ENCRYPT,
 883                         CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
 884                 ret = crypto_register_alg(&xts_aes_alg);
 885                 if (ret)
 886                         goto xts_aes_err;
 887         }
 888
 889         if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
 890                                 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
 891             crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
 892                                 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
 893             crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
 894                                 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
 895                 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
 896                 if (!ctrblk) {
 897                         ret = -ENOMEM;
 898                         goto ctr_aes_err;
 899                 }
 900                 ret = crypto_register_alg(&ctr_aes_alg);
 901                 if (ret) {
 902                         free_page((unsigned long) ctrblk);
 903                         goto ctr_aes_err;
 904                 }
 905         }
 906
 907 out:
 908         return ret;
 909
 910 ctr_aes_err:
 911         crypto_unregister_alg(&xts_aes_alg);
 912 xts_aes_err:
 913         crypto_unregister_alg(&cbc_aes_alg);
 914 cbc_aes_err:
 915         crypto_unregister_alg(&ecb_aes_alg);
 916 ecb_aes_err:
 917         crypto_unregister_alg(&aes_alg);
 918 aes_err:
 919         goto out;
 920 }
 921
 922 static void __exit aes_s390_fini(void)
 923 {
 924         crypto_unregister_alg(&ctr_aes_alg);
 925         free_page((unsigned long) ctrblk);
 926         crypto_unregister_alg(&xts_aes_alg);
 927         crypto_unregister_alg(&cbc_aes_alg);
 928         crypto_unregister_alg(&ecb_aes_alg);
 929         crypto_unregister_alg(&aes_alg);
 930 }
 931
 932 module_init(aes_s390_init);
 933 module_exit(aes_s390_fini);
 934
 935 MODULE_ALIAS("aes-all");
 936
 937 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
 938 MODULE_LICENSE("GPL");