arch/s390/crypto/aes_s390.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Cryptographic API.
   4  *
   5  * s390 implementation of the AES Cipher Algorithm.
   6  *
   7  * s390 Version:
   8  *   Copyright IBM Corp. 2005, 2017
   9  *   Author(s): Jan Glauber ([email protected])
  10  *              Sebastian Siewior ([email protected]> SW-Fallback
  11  *              Patrick Steuer <[email protected]>
  12  *              Harald Freudenberger <[email protected]>
  13  *
  14  * Derived from "crypto/aes_generic.c"
  15  */
  16
  17 #define KMSG_COMPONENT "aes_s390"
  18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  19
  20 #include <crypto/aes.h>
  21 #include <crypto/algapi.h>
  22 #include <crypto/ghash.h>
  23 #include <crypto/internal/aead.h>
  24 #include <crypto/internal/skcipher.h>
  25 #include <crypto/scatterwalk.h>
  26 #include <linux/err.h>
  27 #include <linux/module.h>
  28 #include <linux/cpufeature.h>
  29 #include <linux/init.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/fips.h>
  32 #include <linux/string.h>
  33 #include <crypto/xts.h>
  34 #include <asm/cpacf.h>
  35
  36 static u8 *ctrblk;
  37 static DEFINE_SPINLOCK(ctrblk_lock);
  38
  39 static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
  40                     kma_functions;
  41
  42 struct s390_aes_ctx {
  43         u8 key[AES_MAX_KEY_SIZE];
  44         int key_len;
  45         unsigned long fc;
  46         union {
  47                 struct crypto_sync_skcipher *blk;
  48                 struct crypto_cipher *cip;
  49         } fallback;
  50 };
  51
  52 struct s390_xts_ctx {
  53         u8 key[32];
  54         u8 pcc_key[32];
  55         int key_len;
  56         unsigned long fc;
  57         struct crypto_sync_skcipher *fallback;
  58 };
  59
  60 struct gcm_sg_walk {
  61         struct scatter_walk walk;
  62         unsigned int walk_bytes;
  63         u8 *walk_ptr;
  64         unsigned int walk_bytes_remain;
  65         u8 buf[AES_BLOCK_SIZE];
  66         unsigned int buf_bytes;
  67         u8 *ptr;
  68         unsigned int nbytes;
  69 };
  70
  71 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
  72                 unsigned int key_len)
  73 {
  74         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
  75         int ret;
  76
  77         sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
  78         sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
  79                         CRYPTO_TFM_REQ_MASK);
  80
  81         ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
  82         if (ret) {
  83                 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
  84                 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
  85                                 CRYPTO_TFM_RES_MASK);
  86         }
  87         return ret;
  88 }
  89
  90 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
  91                        unsigned int key_len)
  92 {
  93         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
  94         unsigned long fc;
  95
  96         /* Pick the correct function code based on the key length */
  97         fc = (key_len == 16) ? CPACF_KM_AES_128 :
  98              (key_len == 24) ? CPACF_KM_AES_192 :
  99              (key_len == 32) ? CPACF_KM_AES_256 : 0;
 100
 101         /* Check if the function code is available */
 102         sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 103         if (!sctx->fc)
 104                 return setkey_fallback_cip(tfm, in_key, key_len);
 105
 106         sctx->key_len = key_len;
 107         memcpy(sctx->key, in_key, key_len);
 108         return 0;
 109 }
 110
 111 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 112 {
 113         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 114
 115         if (unlikely(!sctx->fc)) {
 116                 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
 117                 return;
 118         }
 119         cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
 120 }
 121
 122 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 123 {
 124         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 125
 126         if (unlikely(!sctx->fc)) {
 127                 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
 128                 return;
 129         }
 130         cpacf_km(sctx->fc | CPACF_DECRYPT,
 131                  &sctx->key, out, in, AES_BLOCK_SIZE);
 132 }
 133
 134 static int fallback_init_cip(struct crypto_tfm *tfm)
 135 {
 136         const char *name = tfm->__crt_alg->cra_name;
 137         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 138
 139         sctx->fallback.cip = crypto_alloc_cipher(name, 0,
 140                                                  CRYPTO_ALG_NEED_FALLBACK);
 141
 142         if (IS_ERR(sctx->fallback.cip)) {
 143                 pr_err("Allocating AES fallback algorithm %s failed\n",
 144                        name);
 145                 return PTR_ERR(sctx->fallback.cip);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static void fallback_exit_cip(struct crypto_tfm *tfm)
 152 {
 153         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 154
 155         crypto_free_cipher(sctx->fallback.cip);
 156         sctx->fallback.cip = NULL;
 157 }
 158
 159 static struct crypto_alg aes_alg = {
 160         .cra_name               =       "aes",
 161         .cra_driver_name        =       "aes-s390",
 162         .cra_priority           =       300,
 163         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER |
 164                                         CRYPTO_ALG_NEED_FALLBACK,
 165         .cra_blocksize          =       AES_BLOCK_SIZE,
 166         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 167         .cra_module             =       THIS_MODULE,
 168         .cra_init               =       fallback_init_cip,
 169         .cra_exit               =       fallback_exit_cip,
 170         .cra_u                  =       {
 171                 .cipher = {
 172                         .cia_min_keysize        =       AES_MIN_KEY_SIZE,
 173                         .cia_max_keysize        =       AES_MAX_KEY_SIZE,
 174                         .cia_setkey             =       aes_set_key,
 175                         .cia_encrypt            =       aes_encrypt,
 176                         .cia_decrypt            =       aes_decrypt,
 177                 }
 178         }
 179 };
 180
 181 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
 182                 unsigned int len)
 183 {
 184         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 185         unsigned int ret;
 186
 187         crypto_sync_skcipher_clear_flags(sctx->fallback.blk,
 188                                          CRYPTO_TFM_REQ_MASK);
 189         crypto_sync_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
 190                                                       CRYPTO_TFM_REQ_MASK);
 191
 192         ret = crypto_sync_skcipher_setkey(sctx->fallback.blk, key, len);
 193
 194         tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 195         tfm->crt_flags |= crypto_sync_skcipher_get_flags(sctx->fallback.blk) &
 196                           CRYPTO_TFM_RES_MASK;
 197
 198         return ret;
 199 }
 200
 201 static int fallback_blk_dec(struct blkcipher_desc *desc,
 202                 struct scatterlist *dst, struct scatterlist *src,
 203                 unsigned int nbytes)
 204 {
 205         unsigned int ret;
 206         struct crypto_blkcipher *tfm = desc->tfm;
 207         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
 208         SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
 209
 210         skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
 211         skcipher_request_set_callback(req, desc->flags, NULL, NULL);
 212         skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
 213
 214         ret = crypto_skcipher_decrypt(req);
 215
 216         skcipher_request_zero(req);
 217         return ret;
 218 }
 219
 220 static int fallback_blk_enc(struct blkcipher_desc *desc,
 221                 struct scatterlist *dst, struct scatterlist *src,
 222                 unsigned int nbytes)
 223 {
 224         unsigned int ret;
 225         struct crypto_blkcipher *tfm = desc->tfm;
 226         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
 227         SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
 228
 229         skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
 230         skcipher_request_set_callback(req, desc->flags, NULL, NULL);
 231         skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
 232
 233         ret = crypto_skcipher_encrypt(req);
 234         return ret;
 235 }
 236
 237 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 238                            unsigned int key_len)
 239 {
 240         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 241         unsigned long fc;
 242
 243         /* Pick the correct function code based on the key length */
 244         fc = (key_len == 16) ? CPACF_KM_AES_128 :
 245              (key_len == 24) ? CPACF_KM_AES_192 :
 246              (key_len == 32) ? CPACF_KM_AES_256 : 0;
 247
 248         /* Check if the function code is available */
 249         sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 250         if (!sctx->fc)
 251                 return setkey_fallback_blk(tfm, in_key, key_len);
 252
 253         sctx->key_len = key_len;
 254         memcpy(sctx->key, in_key, key_len);
 255         return 0;
 256 }
 257
 258 static int ecb_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
 259                          struct blkcipher_walk *walk)
 260 {
 261         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 262         unsigned int nbytes, n;
 263         int ret;
 264
 265         ret = blkcipher_walk_virt(desc, walk);
 266         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 267                 /* only use complete blocks */
 268                 n = nbytes & ~(AES_BLOCK_SIZE - 1);
 269                 cpacf_km(sctx->fc | modifier, sctx->key,
 270                          walk->dst.virt.addr, walk->src.virt.addr, n);
 271                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 272         }
 273
 274         return ret;
 275 }
 276
 277 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
 278                            struct scatterlist *dst, struct scatterlist *src,
 279                            unsigned int nbytes)
 280 {
 281         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 282         struct blkcipher_walk walk;
 283
 284         if (unlikely(!sctx->fc))
 285                 return fallback_blk_enc(desc, dst, src, nbytes);
 286
 287         blkcipher_walk_init(&walk, dst, src, nbytes);
 288         return ecb_aes_crypt(desc, 0, &walk);
 289 }
 290
 291 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
 292                            struct scatterlist *dst, struct scatterlist *src,
 293                            unsigned int nbytes)
 294 {
 295         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 296         struct blkcipher_walk walk;
 297
 298         if (unlikely(!sctx->fc))
 299                 return fallback_blk_dec(desc, dst, src, nbytes);
 300
 301         blkcipher_walk_init(&walk, dst, src, nbytes);
 302         return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
 303 }
 304
 305 static int fallback_init_blk(struct crypto_tfm *tfm)
 306 {
 307         const char *name = tfm->__crt_alg->cra_name;
 308         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 309
 310         sctx->fallback.blk = crypto_alloc_sync_skcipher(name, 0,
 311                                                    CRYPTO_ALG_NEED_FALLBACK);
 312
 313         if (IS_ERR(sctx->fallback.blk)) {
 314                 pr_err("Allocating AES fallback algorithm %s failed\n",
 315                        name);
 316                 return PTR_ERR(sctx->fallback.blk);
 317         }
 318
 319         return 0;
 320 }
 321
 322 static void fallback_exit_blk(struct crypto_tfm *tfm)
 323 {
 324         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 325
 326         crypto_free_sync_skcipher(sctx->fallback.blk);
 327 }
 328
 329 static struct crypto_alg ecb_aes_alg = {
 330         .cra_name               =       "ecb(aes)",
 331         .cra_driver_name        =       "ecb-aes-s390",
 332         .cra_priority           =       401,    /* combo: aes + ecb + 1 */
 333         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 334                                         CRYPTO_ALG_NEED_FALLBACK,
 335         .cra_blocksize          =       AES_BLOCK_SIZE,
 336         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 337         .cra_type               =       &crypto_blkcipher_type,
 338         .cra_module             =       THIS_MODULE,
 339         .cra_init               =       fallback_init_blk,
 340         .cra_exit               =       fallback_exit_blk,
 341         .cra_u                  =       {
 342                 .blkcipher = {
 343                         .min_keysize            =       AES_MIN_KEY_SIZE,
 344                         .max_keysize            =       AES_MAX_KEY_SIZE,
 345                         .setkey                 =       ecb_aes_set_key,
 346                         .encrypt                =       ecb_aes_encrypt,
 347                         .decrypt                =       ecb_aes_decrypt,
 348                 }
 349         }
 350 };
 351
 352 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 353                            unsigned int key_len)
 354 {
 355         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 356         unsigned long fc;
 357
 358         /* Pick the correct function code based on the key length */
 359         fc = (key_len == 16) ? CPACF_KMC_AES_128 :
 360              (key_len == 24) ? CPACF_KMC_AES_192 :
 361              (key_len == 32) ? CPACF_KMC_AES_256 : 0;
 362
 363         /* Check if the function code is available */
 364         sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
 365         if (!sctx->fc)
 366                 return setkey_fallback_blk(tfm, in_key, key_len);
 367
 368         sctx->key_len = key_len;
 369         memcpy(sctx->key, in_key, key_len);
 370         return 0;
 371 }
 372
 373 static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
 374                          struct blkcipher_walk *walk)
 375 {
 376         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 377         unsigned int nbytes, n;
 378         int ret;
 379         struct {
 380                 u8 iv[AES_BLOCK_SIZE];
 381                 u8 key[AES_MAX_KEY_SIZE];
 382         } param;
 383
 384         ret = blkcipher_walk_virt(desc, walk);
 385         memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
 386         memcpy(param.key, sctx->key, sctx->key_len);
 387         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 388                 /* only use complete blocks */
 389                 n = nbytes & ~(AES_BLOCK_SIZE - 1);
 390                 cpacf_kmc(sctx->fc | modifier, &param,
 391                           walk->dst.virt.addr, walk->src.virt.addr, n);
 392                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 393         }
 394         memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
 395         return ret;
 396 }
 397
 398 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
 399                            struct scatterlist *dst, struct scatterlist *src,
 400                            unsigned int nbytes)
 401 {
 402         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 403         struct blkcipher_walk walk;
 404
 405         if (unlikely(!sctx->fc))
 406                 return fallback_blk_enc(desc, dst, src, nbytes);
 407
 408         blkcipher_walk_init(&walk, dst, src, nbytes);
 409         return cbc_aes_crypt(desc, 0, &walk);
 410 }
 411
 412 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
 413                            struct scatterlist *dst, struct scatterlist *src,
 414                            unsigned int nbytes)
 415 {
 416         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 417         struct blkcipher_walk walk;
 418
 419         if (unlikely(!sctx->fc))
 420                 return fallback_blk_dec(desc, dst, src, nbytes);
 421
 422         blkcipher_walk_init(&walk, dst, src, nbytes);
 423         return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
 424 }
 425
 426 static struct crypto_alg cbc_aes_alg = {
 427         .cra_name               =       "cbc(aes)",
 428         .cra_driver_name        =       "cbc-aes-s390",
 429         .cra_priority           =       402,    /* ecb-aes-s390 + 1 */
 430         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 431                                         CRYPTO_ALG_NEED_FALLBACK,
 432         .cra_blocksize          =       AES_BLOCK_SIZE,
 433         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 434         .cra_type               =       &crypto_blkcipher_type,
 435         .cra_module             =       THIS_MODULE,
 436         .cra_init               =       fallback_init_blk,
 437         .cra_exit               =       fallback_exit_blk,
 438         .cra_u                  =       {
 439                 .blkcipher = {
 440                         .min_keysize            =       AES_MIN_KEY_SIZE,
 441                         .max_keysize            =       AES_MAX_KEY_SIZE,
 442                         .ivsize                 =       AES_BLOCK_SIZE,
 443                         .setkey                 =       cbc_aes_set_key,
 444                         .encrypt                =       cbc_aes_encrypt,
 445                         .decrypt                =       cbc_aes_decrypt,
 446                 }
 447         }
 448 };
 449
 450 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
 451                                    unsigned int len)
 452 {
 453         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 454         unsigned int ret;
 455
 456         crypto_sync_skcipher_clear_flags(xts_ctx->fallback,
 457                                          CRYPTO_TFM_REQ_MASK);
 458         crypto_sync_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
 459                                                      CRYPTO_TFM_REQ_MASK);
 460
 461         ret = crypto_sync_skcipher_setkey(xts_ctx->fallback, key, len);
 462
 463         tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
 464         tfm->crt_flags |= crypto_sync_skcipher_get_flags(xts_ctx->fallback) &
 465                           CRYPTO_TFM_RES_MASK;
 466
 467         return ret;
 468 }
 469
 470 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
 471                 struct scatterlist *dst, struct scatterlist *src,
 472                 unsigned int nbytes)
 473 {
 474         struct crypto_blkcipher *tfm = desc->tfm;
 475         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
 476         SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
 477         unsigned int ret;
 478
 479         skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
 480         skcipher_request_set_callback(req, desc->flags, NULL, NULL);
 481         skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
 482
 483         ret = crypto_skcipher_decrypt(req);
 484
 485         skcipher_request_zero(req);
 486         return ret;
 487 }
 488
 489 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
 490                 struct scatterlist *dst, struct scatterlist *src,
 491                 unsigned int nbytes)
 492 {
 493         struct crypto_blkcipher *tfm = desc->tfm;
 494         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
 495         SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
 496         unsigned int ret;
 497
 498         skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
 499         skcipher_request_set_callback(req, desc->flags, NULL, NULL);
 500         skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
 501
 502         ret = crypto_skcipher_encrypt(req);
 503
 504         skcipher_request_zero(req);
 505         return ret;
 506 }
 507
 508 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 509                            unsigned int key_len)
 510 {
 511         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 512         unsigned long fc;
 513         int err;
 514
 515         err = xts_check_key(tfm, in_key, key_len);
 516         if (err)
 517                 return err;
 518
 519         /* In fips mode only 128 bit or 256 bit keys are valid */
 520         if (fips_enabled && key_len != 32 && key_len != 64) {
 521                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 522                 return -EINVAL;
 523         }
 524
 525         /* Pick the correct function code based on the key length */
 526         fc = (key_len == 32) ? CPACF_KM_XTS_128 :
 527              (key_len == 64) ? CPACF_KM_XTS_256 : 0;
 528
 529         /* Check if the function code is available */
 530         xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 531         if (!xts_ctx->fc)
 532                 return xts_fallback_setkey(tfm, in_key, key_len);
 533
 534         /* Split the XTS key into the two subkeys */
 535         key_len = key_len / 2;
 536         xts_ctx->key_len = key_len;
 537         memcpy(xts_ctx->key, in_key, key_len);
 538         memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
 539         return 0;
 540 }
 541
 542 static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
 543                          struct blkcipher_walk *walk)
 544 {
 545         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 546         unsigned int offset, nbytes, n;
 547         int ret;
 548         struct {
 549                 u8 key[32];
 550                 u8 tweak[16];
 551                 u8 block[16];
 552                 u8 bit[16];
 553                 u8 xts[16];
 554         } pcc_param;
 555         struct {
 556                 u8 key[32];
 557                 u8 init[16];
 558         } xts_param;
 559
 560         ret = blkcipher_walk_virt(desc, walk);
 561         offset = xts_ctx->key_len & 0x10;
 562         memset(pcc_param.block, 0, sizeof(pcc_param.block));
 563         memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
 564         memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
 565         memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
 566         memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
 567         cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
 568
 569         memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
 570         memcpy(xts_param.init, pcc_param.xts, 16);
 571
 572         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 573                 /* only use complete blocks */
 574                 n = nbytes & ~(AES_BLOCK_SIZE - 1);
 575                 cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
 576                          walk->dst.virt.addr, walk->src.virt.addr, n);
 577                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 578         }
 579         return ret;
 580 }
 581
 582 static int xts_aes_encrypt(struct blkcipher_desc *desc,
 583                            struct scatterlist *dst, struct scatterlist *src,
 584                            unsigned int nbytes)
 585 {
 586         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 587         struct blkcipher_walk walk;
 588
 589         if (unlikely(!xts_ctx->fc))
 590                 return xts_fallback_encrypt(desc, dst, src, nbytes);
 591
 592         blkcipher_walk_init(&walk, dst, src, nbytes);
 593         return xts_aes_crypt(desc, 0, &walk);
 594 }
 595
 596 static int xts_aes_decrypt(struct blkcipher_desc *desc,
 597                            struct scatterlist *dst, struct scatterlist *src,
 598                            unsigned int nbytes)
 599 {
 600         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 601         struct blkcipher_walk walk;
 602
 603         if (unlikely(!xts_ctx->fc))
 604                 return xts_fallback_decrypt(desc, dst, src, nbytes);
 605
 606         blkcipher_walk_init(&walk, dst, src, nbytes);
 607         return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
 608 }
 609
 610 static int xts_fallback_init(struct crypto_tfm *tfm)
 611 {
 612         const char *name = tfm->__crt_alg->cra_name;
 613         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 614
 615         xts_ctx->fallback = crypto_alloc_sync_skcipher(name, 0,
 616                                                   CRYPTO_ALG_NEED_FALLBACK);
 617
 618         if (IS_ERR(xts_ctx->fallback)) {
 619                 pr_err("Allocating XTS fallback algorithm %s failed\n",
 620                        name);
 621                 return PTR_ERR(xts_ctx->fallback);
 622         }
 623         return 0;
 624 }
 625
 626 static void xts_fallback_exit(struct crypto_tfm *tfm)
 627 {
 628         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 629
 630         crypto_free_sync_skcipher(xts_ctx->fallback);
 631 }
 632
 633 static struct crypto_alg xts_aes_alg = {
 634         .cra_name               =       "xts(aes)",
 635         .cra_driver_name        =       "xts-aes-s390",
 636         .cra_priority           =       402,    /* ecb-aes-s390 + 1 */
 637         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 638                                         CRYPTO_ALG_NEED_FALLBACK,
 639         .cra_blocksize          =       AES_BLOCK_SIZE,
 640         .cra_ctxsize            =       sizeof(struct s390_xts_ctx),
 641         .cra_type               =       &crypto_blkcipher_type,
 642         .cra_module             =       THIS_MODULE,
 643         .cra_init               =       xts_fallback_init,
 644         .cra_exit               =       xts_fallback_exit,
 645         .cra_u                  =       {
 646                 .blkcipher = {
 647                         .min_keysize            =       2 * AES_MIN_KEY_SIZE,
 648                         .max_keysize            =       2 * AES_MAX_KEY_SIZE,
 649                         .ivsize                 =       AES_BLOCK_SIZE,
 650                         .setkey                 =       xts_aes_set_key,
 651                         .encrypt                =       xts_aes_encrypt,
 652                         .decrypt                =       xts_aes_decrypt,
 653                 }
 654         }
 655 };
 656
 657 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 658                            unsigned int key_len)
 659 {
 660         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 661         unsigned long fc;
 662
 663         /* Pick the correct function code based on the key length */
 664         fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
 665              (key_len == 24) ? CPACF_KMCTR_AES_192 :
 666              (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
 667
 668         /* Check if the function code is available */
 669         sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
 670         if (!sctx->fc)
 671                 return setkey_fallback_blk(tfm, in_key, key_len);
 672
 673         sctx->key_len = key_len;
 674         memcpy(sctx->key, in_key, key_len);
 675         return 0;
 676 }
 677
 678 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
 679 {
 680         unsigned int i, n;
 681
 682         /* only use complete blocks, max. PAGE_SIZE */
 683         memcpy(ctrptr, iv, AES_BLOCK_SIZE);
 684         n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
 685         for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
 686                 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
 687                 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
 688                 ctrptr += AES_BLOCK_SIZE;
 689         }
 690         return n;
 691 }
 692
 693 static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
 694                          struct blkcipher_walk *walk)
 695 {
 696         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 697         u8 buf[AES_BLOCK_SIZE], *ctrptr;
 698         unsigned int n, nbytes;
 699         int ret, locked;
 700
 701         locked = spin_trylock(&ctrblk_lock);
 702
 703         ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
 704         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 705                 n = AES_BLOCK_SIZE;
 706                 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
 707                         n = __ctrblk_init(ctrblk, walk->iv, nbytes);
 708                 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
 709                 cpacf_kmctr(sctx->fc | modifier, sctx->key,
 710                             walk->dst.virt.addr, walk->src.virt.addr,
 711                             n, ctrptr);
 712                 if (ctrptr == ctrblk)
 713                         memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
 714                                AES_BLOCK_SIZE);
 715                 crypto_inc(walk->iv, AES_BLOCK_SIZE);
 716                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 717         }
 718         if (locked)
 719                 spin_unlock(&ctrblk_lock);
 720         /*
 721          * final block may be < AES_BLOCK_SIZE, copy only nbytes
 722          */
 723         if (nbytes) {
 724                 cpacf_kmctr(sctx->fc | modifier, sctx->key,
 725                             buf, walk->src.virt.addr,
 726                             AES_BLOCK_SIZE, walk->iv);
 727                 memcpy(walk->dst.virt.addr, buf, nbytes);
 728                 crypto_inc(walk->iv, AES_BLOCK_SIZE);
 729                 ret = blkcipher_walk_done(desc, walk, 0);
 730         }
 731
 732         return ret;
 733 }
 734
 735 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
 736                            struct scatterlist *dst, struct scatterlist *src,
 737                            unsigned int nbytes)
 738 {
 739         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 740         struct blkcipher_walk walk;
 741
 742         if (unlikely(!sctx->fc))
 743                 return fallback_blk_enc(desc, dst, src, nbytes);
 744
 745         blkcipher_walk_init(&walk, dst, src, nbytes);
 746         return ctr_aes_crypt(desc, 0, &walk);
 747 }
 748
 749 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
 750                            struct scatterlist *dst, struct scatterlist *src,
 751                            unsigned int nbytes)
 752 {
 753         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 754         struct blkcipher_walk walk;
 755
 756         if (unlikely(!sctx->fc))
 757                 return fallback_blk_dec(desc, dst, src, nbytes);
 758
 759         blkcipher_walk_init(&walk, dst, src, nbytes);
 760         return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
 761 }
 762
 763 static struct crypto_alg ctr_aes_alg = {
 764         .cra_name               =       "ctr(aes)",
 765         .cra_driver_name        =       "ctr-aes-s390",
 766         .cra_priority           =       402,    /* ecb-aes-s390 + 1 */
 767         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 768                                         CRYPTO_ALG_NEED_FALLBACK,
 769         .cra_blocksize          =       1,
 770         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 771         .cra_type               =       &crypto_blkcipher_type,
 772         .cra_module             =       THIS_MODULE,
 773         .cra_init               =       fallback_init_blk,
 774         .cra_exit               =       fallback_exit_blk,
 775         .cra_u                  =       {
 776                 .blkcipher = {
 777                         .min_keysize            =       AES_MIN_KEY_SIZE,
 778                         .max_keysize            =       AES_MAX_KEY_SIZE,
 779                         .ivsize                 =       AES_BLOCK_SIZE,
 780                         .setkey                 =       ctr_aes_set_key,
 781                         .encrypt                =       ctr_aes_encrypt,
 782                         .decrypt                =       ctr_aes_decrypt,
 783                 }
 784         }
 785 };
 786
 787 static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
 788                           unsigned int keylen)
 789 {
 790         struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 791
 792         switch (keylen) {
 793         case AES_KEYSIZE_128:
 794                 ctx->fc = CPACF_KMA_GCM_AES_128;
 795                 break;
 796         case AES_KEYSIZE_192:
 797                 ctx->fc = CPACF_KMA_GCM_AES_192;
 798                 break;
 799         case AES_KEYSIZE_256:
 800                 ctx->fc = CPACF_KMA_GCM_AES_256;
 801                 break;
 802         default:
 803                 return -EINVAL;
 804         }
 805
 806         memcpy(ctx->key, key, keylen);
 807         ctx->key_len = keylen;
 808         return 0;
 809 }
 810
 811 static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 812 {
 813         switch (authsize) {
 814         case 4:
 815         case 8:
 816         case 12:
 817         case 13:
 818         case 14:
 819         case 15:
 820         case 16:
 821                 break;
 822         default:
 823                 return -EINVAL;
 824         }
 825
 826         return 0;
 827 }
 828
 829 static void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
 830                               unsigned int len)
 831 {
 832         memset(gw, 0, sizeof(*gw));
 833         gw->walk_bytes_remain = len;
 834         scatterwalk_start(&gw->walk, sg);
 835 }
 836
 837 static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 838 {
 839         int n;
 840
 841         /* minbytesneeded <= AES_BLOCK_SIZE */
 842         if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
 843                 gw->ptr = gw->buf;
 844                 gw->nbytes = gw->buf_bytes;
 845                 goto out;
 846         }
 847
 848         if (gw->walk_bytes_remain == 0) {
 849                 gw->ptr = NULL;
 850                 gw->nbytes = 0;
 851                 goto out;
 852         }
 853
 854         gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
 855         if (!gw->walk_bytes) {
 856                 scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
 857                 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
 858                                                    gw->walk_bytes_remain);
 859         }
 860         gw->walk_ptr = scatterwalk_map(&gw->walk);
 861
 862         if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
 863                 gw->ptr = gw->walk_ptr;
 864                 gw->nbytes = gw->walk_bytes;
 865                 goto out;
 866         }
 867
 868         while (1) {
 869                 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
 870                 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
 871                 gw->buf_bytes += n;
 872                 gw->walk_bytes_remain -= n;
 873                 scatterwalk_unmap(&gw->walk);
 874                 scatterwalk_advance(&gw->walk, n);
 875                 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
 876
 877                 if (gw->buf_bytes >= minbytesneeded) {
 878                         gw->ptr = gw->buf;
 879                         gw->nbytes = gw->buf_bytes;
 880                         goto out;
 881                 }
 882
 883                 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
 884                                                    gw->walk_bytes_remain);
 885                 if (!gw->walk_bytes) {
 886                         scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
 887                         gw->walk_bytes = scatterwalk_clamp(&gw->walk,
 888                                                         gw->walk_bytes_remain);
 889                 }
 890                 gw->walk_ptr = scatterwalk_map(&gw->walk);
 891         }
 892
 893 out:
 894         return gw->nbytes;
 895 }
 896
 897 static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 898 {
 899         int n;
 900
 901         if (gw->ptr == NULL)
 902                 return;
 903
 904         if (gw->ptr == gw->buf) {
 905                 n = gw->buf_bytes - bytesdone;
 906                 if (n > 0) {
 907                         memmove(gw->buf, gw->buf + bytesdone, n);
 908                         gw->buf_bytes -= n;
 909                 } else
 910                         gw->buf_bytes = 0;
 911         } else {
 912                 gw->walk_bytes_remain -= bytesdone;
 913                 scatterwalk_unmap(&gw->walk);
 914                 scatterwalk_advance(&gw->walk, bytesdone);
 915                 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
 916         }
 917 }
 918
 919 static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
 920 {
 921         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 922         struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 923         unsigned int ivsize = crypto_aead_ivsize(tfm);
 924         unsigned int taglen = crypto_aead_authsize(tfm);
 925         unsigned int aadlen = req->assoclen;
 926         unsigned int pclen = req->cryptlen;
 927         int ret = 0;
 928
 929         unsigned int len, in_bytes, out_bytes,
 930                      min_bytes, bytes, aad_bytes, pc_bytes;
 931         struct gcm_sg_walk gw_in, gw_out;
 932         u8 tag[GHASH_DIGEST_SIZE];
 933
 934         struct {
 935                 u32 _[3];               /* reserved */
 936                 u32 cv;                 /* Counter Value */
 937                 u8 t[GHASH_DIGEST_SIZE];/* Tag */
 938                 u8 h[AES_BLOCK_SIZE];   /* Hash-subkey */
 939                 u64 taadl;              /* Total AAD Length */
 940                 u64 tpcl;               /* Total Plain-/Cipher-text Length */
 941                 u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
 942                 u8 k[AES_MAX_KEY_SIZE]; /* Key */
 943         } param;
 944
 945         /*
 946          * encrypt
 947          *   req->src: aad||plaintext
 948          *   req->dst: aad||ciphertext||tag
 949          * decrypt
 950          *   req->src: aad||ciphertext||tag
 951          *   req->dst: aad||plaintext, return 0 or -EBADMSG
 952          * aad, plaintext and ciphertext may be empty.
 953          */
 954         if (flags & CPACF_DECRYPT)
 955                 pclen -= taglen;
 956         len = aadlen + pclen;
 957
 958         memset(&param, 0, sizeof(param));
 959         param.cv = 1;
 960         param.taadl = aadlen * 8;
 961         param.tpcl = pclen * 8;
 962         memcpy(param.j0, req->iv, ivsize);
 963         *(u32 *)(param.j0 + ivsize) = 1;
 964         memcpy(param.k, ctx->key, ctx->key_len);
 965
 966         gcm_sg_walk_start(&gw_in, req->src, len);
 967         gcm_sg_walk_start(&gw_out, req->dst, len);
 968
 969         do {
 970                 min_bytes = min_t(unsigned int,
 971                                   aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
 972                 in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
 973                 out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
 974                 bytes = min(in_bytes, out_bytes);
 975
 976                 if (aadlen + pclen <= bytes) {
 977                         aad_bytes = aadlen;
 978                         pc_bytes = pclen;
 979                         flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
 980                 } else {
 981                         if (aadlen <= bytes) {
 982                                 aad_bytes = aadlen;
 983                                 pc_bytes = (bytes - aadlen) &
 984                                            ~(AES_BLOCK_SIZE - 1);
 985                                 flags |= CPACF_KMA_LAAD;
 986                         } else {
 987                                 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
 988                                 pc_bytes = 0;
 989                         }
 990                 }
 991
 992                 if (aad_bytes > 0)
 993                         memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
 994
 995                 cpacf_kma(ctx->fc | flags, &param,
 996                           gw_out.ptr + aad_bytes,
 997                           gw_in.ptr + aad_bytes, pc_bytes,
 998                           gw_in.ptr, aad_bytes);
 999
1000                 gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
1001                 gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
1002                 aadlen -= aad_bytes;
1003                 pclen -= pc_bytes;
1004         } while (aadlen + pclen > 0);
1005
1006         if (flags & CPACF_DECRYPT) {
1007                 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1008                 if (crypto_memneq(tag, param.t, taglen))
1009                         ret = -EBADMSG;
1010         } else
1011                 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1012
1013         memzero_explicit(&param, sizeof(param));
1014         return ret;
1015 }
1016
1017 static int gcm_aes_encrypt(struct aead_request *req)
1018 {
1019         return gcm_aes_crypt(req, CPACF_ENCRYPT);
1020 }
1021
1022 static int gcm_aes_decrypt(struct aead_request *req)
1023 {
1024         return gcm_aes_crypt(req, CPACF_DECRYPT);
1025 }
1026
1027 static struct aead_alg gcm_aes_aead = {
1028         .setkey                 = gcm_aes_setkey,
1029         .setauthsize            = gcm_aes_setauthsize,
1030         .encrypt                = gcm_aes_encrypt,
1031         .decrypt                = gcm_aes_decrypt,
1032
1033         .ivsize                 = GHASH_BLOCK_SIZE - sizeof(u32),
1034         .maxauthsize            = GHASH_DIGEST_SIZE,
1035         .chunksize              = AES_BLOCK_SIZE,
1036
1037         .base                   = {
1038                 .cra_blocksize          = 1,
1039                 .cra_ctxsize            = sizeof(struct s390_aes_ctx),
1040                 .cra_priority           = 900,
1041                 .cra_name               = "gcm(aes)",
1042                 .cra_driver_name        = "gcm-aes-s390",
1043                 .cra_module             = THIS_MODULE,
1044         },
1045 };
1046
1047 static struct crypto_alg *aes_s390_algs_ptr[5];
1048 static int aes_s390_algs_num;
1049 static struct aead_alg *aes_s390_aead_alg;
1050
1051 static int aes_s390_register_alg(struct crypto_alg *alg)
1052 {
1053         int ret;
1054
1055         ret = crypto_register_alg(alg);
1056         if (!ret)
1057                 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
1058         return ret;
1059 }
1060
1061 static void aes_s390_fini(void)
1062 {
1063         while (aes_s390_algs_num--)
1064                 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
1065         if (ctrblk)
1066                 free_page((unsigned long) ctrblk);
1067
1068         if (aes_s390_aead_alg)
1069                 crypto_unregister_aead(aes_s390_aead_alg);
1070 }
1071
1072 static int __init aes_s390_init(void)
1073 {
1074         int ret;
1075
1076         /* Query available functions for KM, KMC, KMCTR and KMA */
1077         cpacf_query(CPACF_KM, &km_functions);
1078         cpacf_query(CPACF_KMC, &kmc_functions);
1079         cpacf_query(CPACF_KMCTR, &kmctr_functions);
1080         cpacf_query(CPACF_KMA, &kma_functions);
1081
1082         if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1083             cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1084             cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1085                 ret = aes_s390_register_alg(&aes_alg);
1086                 if (ret)
1087                         goto out_err;
1088                 ret = aes_s390_register_alg(&ecb_aes_alg);
1089                 if (ret)
1090                         goto out_err;
1091         }
1092
1093         if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1094             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1095             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1096                 ret = aes_s390_register_alg(&cbc_aes_alg);
1097                 if (ret)
1098                         goto out_err;
1099         }
1100
1101         if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1102             cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1103                 ret = aes_s390_register_alg(&xts_aes_alg);
1104                 if (ret)
1105                         goto out_err;
1106         }
1107
1108         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1109             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1110             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1111                 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1112                 if (!ctrblk) {
1113                         ret = -ENOMEM;
1114                         goto out_err;
1115                 }
1116                 ret = aes_s390_register_alg(&ctr_aes_alg);
1117                 if (ret)
1118                         goto out_err;
1119         }
1120
1121         if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1122             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1123             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1124                 ret = crypto_register_aead(&gcm_aes_aead);
1125                 if (ret)
1126                         goto out_err;
1127                 aes_s390_aead_alg = &gcm_aes_aead;
1128         }
1129
1130         return 0;
1131 out_err:
1132         aes_s390_fini();
1133         return ret;
1134 }
1135
1136 module_cpu_feature_match(MSA, aes_s390_init);
1137 module_exit(aes_s390_fini);
1138
1139 MODULE_ALIAS_CRYPTO("aes-all");
1140
1141 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1142 MODULE_LICENSE("GPL");