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 (jang@de.ibm.com)
  10  *              Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
  11  *              Patrick Steuer <patrick.steuer@de.ibm.com>
  12  *              Harald Freudenberger <freude@de.ibm.com>
  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/mutex.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_MUTEX(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 crypto_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 crypto_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            =       crypto_aes_encrypt,
 176                         .cia_decrypt            =       crypto_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_fallback_setkey(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 0;
 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 (!nbytes)
 590                 return -EINVAL;
 591
 592         if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
 593                 return xts_fallback_encrypt(desc, dst, src, nbytes);
 594
 595         blkcipher_walk_init(&walk, dst, src, nbytes);
 596         return xts_aes_crypt(desc, 0, &walk);
 597 }
 598
 599 static int xts_aes_decrypt(struct blkcipher_desc *desc,
 600                            struct scatterlist *dst, struct scatterlist *src,
 601                            unsigned int nbytes)
 602 {
 603         struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
 604         struct blkcipher_walk walk;
 605
 606         if (!nbytes)
 607                 return -EINVAL;
 608
 609         if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
 610                 return xts_fallback_decrypt(desc, dst, src, nbytes);
 611
 612         blkcipher_walk_init(&walk, dst, src, nbytes);
 613         return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
 614 }
 615
 616 static int xts_fallback_init(struct crypto_tfm *tfm)
 617 {
 618         const char *name = tfm->__crt_alg->cra_name;
 619         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 620
 621         xts_ctx->fallback = crypto_alloc_sync_skcipher(name, 0,
 622                                                   CRYPTO_ALG_NEED_FALLBACK);
 623
 624         if (IS_ERR(xts_ctx->fallback)) {
 625                 pr_err("Allocating XTS fallback algorithm %s failed\n",
 626                        name);
 627                 return PTR_ERR(xts_ctx->fallback);
 628         }
 629         return 0;
 630 }
 631
 632 static void xts_fallback_exit(struct crypto_tfm *tfm)
 633 {
 634         struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
 635
 636         crypto_free_sync_skcipher(xts_ctx->fallback);
 637 }
 638
 639 static struct crypto_alg xts_aes_alg = {
 640         .cra_name               =       "xts(aes)",
 641         .cra_driver_name        =       "xts-aes-s390",
 642         .cra_priority           =       402,    /* ecb-aes-s390 + 1 */
 643         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 644                                         CRYPTO_ALG_NEED_FALLBACK,
 645         .cra_blocksize          =       AES_BLOCK_SIZE,
 646         .cra_ctxsize            =       sizeof(struct s390_xts_ctx),
 647         .cra_type               =       &crypto_blkcipher_type,
 648         .cra_module             =       THIS_MODULE,
 649         .cra_init               =       xts_fallback_init,
 650         .cra_exit               =       xts_fallback_exit,
 651         .cra_u                  =       {
 652                 .blkcipher = {
 653                         .min_keysize            =       2 * AES_MIN_KEY_SIZE,
 654                         .max_keysize            =       2 * AES_MAX_KEY_SIZE,
 655                         .ivsize                 =       AES_BLOCK_SIZE,
 656                         .setkey                 =       xts_aes_set_key,
 657                         .encrypt                =       xts_aes_encrypt,
 658                         .decrypt                =       xts_aes_decrypt,
 659                 }
 660         }
 661 };
 662
 663 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 664                            unsigned int key_len)
 665 {
 666         struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 667         unsigned long fc;
 668
 669         /* Pick the correct function code based on the key length */
 670         fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
 671              (key_len == 24) ? CPACF_KMCTR_AES_192 :
 672              (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
 673
 674         /* Check if the function code is available */
 675         sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
 676         if (!sctx->fc)
 677                 return setkey_fallback_blk(tfm, in_key, key_len);
 678
 679         sctx->key_len = key_len;
 680         memcpy(sctx->key, in_key, key_len);
 681         return 0;
 682 }
 683
 684 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
 685 {
 686         unsigned int i, n;
 687
 688         /* only use complete blocks, max. PAGE_SIZE */
 689         memcpy(ctrptr, iv, AES_BLOCK_SIZE);
 690         n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
 691         for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
 692                 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
 693                 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
 694                 ctrptr += AES_BLOCK_SIZE;
 695         }
 696         return n;
 697 }
 698
 699 static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
 700                          struct blkcipher_walk *walk)
 701 {
 702         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 703         u8 buf[AES_BLOCK_SIZE], *ctrptr;
 704         unsigned int n, nbytes;
 705         int ret, locked;
 706
 707         locked = mutex_trylock(&ctrblk_lock);
 708
 709         ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
 710         while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
 711                 n = AES_BLOCK_SIZE;
 712                 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
 713                         n = __ctrblk_init(ctrblk, walk->iv, nbytes);
 714                 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
 715                 cpacf_kmctr(sctx->fc | modifier, sctx->key,
 716                             walk->dst.virt.addr, walk->src.virt.addr,
 717                             n, ctrptr);
 718                 if (ctrptr == ctrblk)
 719                         memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
 720                                AES_BLOCK_SIZE);
 721                 crypto_inc(walk->iv, AES_BLOCK_SIZE);
 722                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 723         }
 724         if (locked)
 725                 mutex_unlock(&ctrblk_lock);
 726         /*
 727          * final block may be < AES_BLOCK_SIZE, copy only nbytes
 728          */
 729         if (nbytes) {
 730                 cpacf_kmctr(sctx->fc | modifier, sctx->key,
 731                             buf, walk->src.virt.addr,
 732                             AES_BLOCK_SIZE, walk->iv);
 733                 memcpy(walk->dst.virt.addr, buf, nbytes);
 734                 crypto_inc(walk->iv, AES_BLOCK_SIZE);
 735                 ret = blkcipher_walk_done(desc, walk, 0);
 736         }
 737
 738         return ret;
 739 }
 740
 741 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
 742                            struct scatterlist *dst, struct scatterlist *src,
 743                            unsigned int nbytes)
 744 {
 745         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 746         struct blkcipher_walk walk;
 747
 748         if (unlikely(!sctx->fc))
 749                 return fallback_blk_enc(desc, dst, src, nbytes);
 750
 751         blkcipher_walk_init(&walk, dst, src, nbytes);
 752         return ctr_aes_crypt(desc, 0, &walk);
 753 }
 754
 755 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
 756                            struct scatterlist *dst, struct scatterlist *src,
 757                            unsigned int nbytes)
 758 {
 759         struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 760         struct blkcipher_walk walk;
 761
 762         if (unlikely(!sctx->fc))
 763                 return fallback_blk_dec(desc, dst, src, nbytes);
 764
 765         blkcipher_walk_init(&walk, dst, src, nbytes);
 766         return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
 767 }
 768
 769 static struct crypto_alg ctr_aes_alg = {
 770         .cra_name               =       "ctr(aes)",
 771         .cra_driver_name        =       "ctr-aes-s390",
 772         .cra_priority           =       402,    /* ecb-aes-s390 + 1 */
 773         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER |
 774                                         CRYPTO_ALG_NEED_FALLBACK,
 775         .cra_blocksize          =       1,
 776         .cra_ctxsize            =       sizeof(struct s390_aes_ctx),
 777         .cra_type               =       &crypto_blkcipher_type,
 778         .cra_module             =       THIS_MODULE,
 779         .cra_init               =       fallback_init_blk,
 780         .cra_exit               =       fallback_exit_blk,
 781         .cra_u                  =       {
 782                 .blkcipher = {
 783                         .min_keysize            =       AES_MIN_KEY_SIZE,
 784                         .max_keysize            =       AES_MAX_KEY_SIZE,
 785                         .ivsize                 =       AES_BLOCK_SIZE,
 786                         .setkey                 =       ctr_aes_set_key,
 787                         .encrypt                =       ctr_aes_encrypt,
 788                         .decrypt                =       ctr_aes_decrypt,
 789                 }
 790         }
 791 };
 792
 793 static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
 794                           unsigned int keylen)
 795 {
 796         struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 797
 798         switch (keylen) {
 799         case AES_KEYSIZE_128:
 800                 ctx->fc = CPACF_KMA_GCM_AES_128;
 801                 break;
 802         case AES_KEYSIZE_192:
 803                 ctx->fc = CPACF_KMA_GCM_AES_192;
 804                 break;
 805         case AES_KEYSIZE_256:
 806                 ctx->fc = CPACF_KMA_GCM_AES_256;
 807                 break;
 808         default:
 809                 return -EINVAL;
 810         }
 811
 812         memcpy(ctx->key, key, keylen);
 813         ctx->key_len = keylen;
 814         return 0;
 815 }
 816
 817 static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 818 {
 819         switch (authsize) {
 820         case 4:
 821         case 8:
 822         case 12:
 823         case 13:
 824         case 14:
 825         case 15:
 826         case 16:
 827                 break;
 828         default:
 829                 return -EINVAL;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
 836                            unsigned int len)
 837 {
 838         memset(gw, 0, sizeof(*gw));
 839         gw->walk_bytes_remain = len;
 840         scatterwalk_start(&gw->walk, sg);
 841 }
 842
 843 static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
 844 {
 845         struct scatterlist *nextsg;
 846
 847         gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
 848         while (!gw->walk_bytes) {
 849                 nextsg = sg_next(gw->walk.sg);
 850                 if (!nextsg)
 851                         return 0;
 852                 scatterwalk_start(&gw->walk, nextsg);
 853                 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
 854                                                    gw->walk_bytes_remain);
 855         }
 856         gw->walk_ptr = scatterwalk_map(&gw->walk);
 857         return gw->walk_bytes;
 858 }
 859
 860 static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
 861                                              unsigned int nbytes)
 862 {
 863         gw->walk_bytes_remain -= nbytes;
 864         scatterwalk_unmap(&gw->walk);
 865         scatterwalk_advance(&gw->walk, nbytes);
 866         scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
 867         gw->walk_ptr = NULL;
 868 }
 869
 870 static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 871 {
 872         int n;
 873
 874         if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
 875                 gw->ptr = gw->buf;
 876                 gw->nbytes = gw->buf_bytes;
 877                 goto out;
 878         }
 879
 880         if (gw->walk_bytes_remain == 0) {
 881                 gw->ptr = NULL;
 882                 gw->nbytes = 0;
 883                 goto out;
 884         }
 885
 886         if (!_gcm_sg_clamp_and_map(gw)) {
 887                 gw->ptr = NULL;
 888                 gw->nbytes = 0;
 889                 goto out;
 890         }
 891
 892         if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
 893                 gw->ptr = gw->walk_ptr;
 894                 gw->nbytes = gw->walk_bytes;
 895                 goto out;
 896         }
 897
 898         while (1) {
 899                 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
 900                 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
 901                 gw->buf_bytes += n;
 902                 _gcm_sg_unmap_and_advance(gw, n);
 903                 if (gw->buf_bytes >= minbytesneeded) {
 904                         gw->ptr = gw->buf;
 905                         gw->nbytes = gw->buf_bytes;
 906                         goto out;
 907                 }
 908                 if (!_gcm_sg_clamp_and_map(gw)) {
 909                         gw->ptr = NULL;
 910                         gw->nbytes = 0;
 911                         goto out;
 912                 }
 913         }
 914
 915 out:
 916         return gw->nbytes;
 917 }
 918
 919 static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 920 {
 921         if (gw->walk_bytes_remain == 0) {
 922                 gw->ptr = NULL;
 923                 gw->nbytes = 0;
 924                 goto out;
 925         }
 926
 927         if (!_gcm_sg_clamp_and_map(gw)) {
 928                 gw->ptr = NULL;
 929                 gw->nbytes = 0;
 930                 goto out;
 931         }
 932
 933         if (gw->walk_bytes >= minbytesneeded) {
 934                 gw->ptr = gw->walk_ptr;
 935                 gw->nbytes = gw->walk_bytes;
 936                 goto out;
 937         }
 938
 939         scatterwalk_unmap(&gw->walk);
 940         gw->walk_ptr = NULL;
 941
 942         gw->ptr = gw->buf;
 943         gw->nbytes = sizeof(gw->buf);
 944
 945 out:
 946         return gw->nbytes;
 947 }
 948
 949 static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 950 {
 951         if (gw->ptr == NULL)
 952                 return 0;
 953
 954         if (gw->ptr == gw->buf) {
 955                 int n = gw->buf_bytes - bytesdone;
 956                 if (n > 0) {
 957                         memmove(gw->buf, gw->buf + bytesdone, n);
 958                         gw->buf_bytes = n;
 959                 } else
 960                         gw->buf_bytes = 0;
 961         } else
 962                 _gcm_sg_unmap_and_advance(gw, bytesdone);
 963
 964         return bytesdone;
 965 }
 966
 967 static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 968 {
 969         int i, n;
 970
 971         if (gw->ptr == NULL)
 972                 return 0;
 973
 974         if (gw->ptr == gw->buf) {
 975                 for (i = 0; i < bytesdone; i += n) {
 976                         if (!_gcm_sg_clamp_and_map(gw))
 977                                 return i;
 978                         n = min(gw->walk_bytes, bytesdone - i);
 979                         memcpy(gw->walk_ptr, gw->buf + i, n);
 980                         _gcm_sg_unmap_and_advance(gw, n);
 981                 }
 982         } else
 983                 _gcm_sg_unmap_and_advance(gw, bytesdone);
 984
 985         return bytesdone;
 986 }
 987
 988 static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
 989 {
 990         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 991         struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 992         unsigned int ivsize = crypto_aead_ivsize(tfm);
 993         unsigned int taglen = crypto_aead_authsize(tfm);
 994         unsigned int aadlen = req->assoclen;
 995         unsigned int pclen = req->cryptlen;
 996         int ret = 0;
 997
 998         unsigned int n, len, in_bytes, out_bytes,
 999                      min_bytes, bytes, aad_bytes, pc_bytes;
1000         struct gcm_sg_walk gw_in, gw_out;
1001         u8 tag[GHASH_DIGEST_SIZE];
1002
1003         struct {
1004                 u32 _[3];               /* reserved */
1005                 u32 cv;                 /* Counter Value */
1006                 u8 t[GHASH_DIGEST_SIZE];/* Tag */
1007                 u8 h[AES_BLOCK_SIZE];   /* Hash-subkey */
1008                 u64 taadl;              /* Total AAD Length */
1009                 u64 tpcl;               /* Total Plain-/Cipher-text Length */
1010                 u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
1011                 u8 k[AES_MAX_KEY_SIZE]; /* Key */
1012         } param;
1013
1014         /*
1015          * encrypt
1016          *   req->src: aad||plaintext
1017          *   req->dst: aad||ciphertext||tag
1018          * decrypt
1019          *   req->src: aad||ciphertext||tag
1020          *   req->dst: aad||plaintext, return 0 or -EBADMSG
1021          * aad, plaintext and ciphertext may be empty.
1022          */
1023         if (flags & CPACF_DECRYPT)
1024                 pclen -= taglen;
1025         len = aadlen + pclen;
1026
1027         memset(&param, 0, sizeof(param));
1028         param.cv = 1;
1029         param.taadl = aadlen * 8;
1030         param.tpcl = pclen * 8;
1031         memcpy(param.j0, req->iv, ivsize);
1032         *(u32 *)(param.j0 + ivsize) = 1;
1033         memcpy(param.k, ctx->key, ctx->key_len);
1034
1035         gcm_walk_start(&gw_in, req->src, len);
1036         gcm_walk_start(&gw_out, req->dst, len);
1037
1038         do {
1039                 min_bytes = min_t(unsigned int,
1040                                   aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
1041                 in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
1042                 out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
1043                 bytes = min(in_bytes, out_bytes);
1044
1045                 if (aadlen + pclen <= bytes) {
1046                         aad_bytes = aadlen;
1047                         pc_bytes = pclen;
1048                         flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
1049                 } else {
1050                         if (aadlen <= bytes) {
1051                                 aad_bytes = aadlen;
1052                                 pc_bytes = (bytes - aadlen) &
1053                                            ~(AES_BLOCK_SIZE - 1);
1054                                 flags |= CPACF_KMA_LAAD;
1055                         } else {
1056                                 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
1057                                 pc_bytes = 0;
1058                         }
1059                 }
1060
1061                 if (aad_bytes > 0)
1062                         memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
1063
1064                 cpacf_kma(ctx->fc | flags, &param,
1065                           gw_out.ptr + aad_bytes,
1066                           gw_in.ptr + aad_bytes, pc_bytes,
1067                           gw_in.ptr, aad_bytes);
1068
1069                 n = aad_bytes + pc_bytes;
1070                 if (gcm_in_walk_done(&gw_in, n) != n)
1071                         return -ENOMEM;
1072                 if (gcm_out_walk_done(&gw_out, n) != n)
1073                         return -ENOMEM;
1074                 aadlen -= aad_bytes;
1075                 pclen -= pc_bytes;
1076         } while (aadlen + pclen > 0);
1077
1078         if (flags & CPACF_DECRYPT) {
1079                 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1080                 if (crypto_memneq(tag, param.t, taglen))
1081                         ret = -EBADMSG;
1082         } else
1083                 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1084
1085         memzero_explicit(&param, sizeof(param));
1086         return ret;
1087 }
1088
1089 static int gcm_aes_encrypt(struct aead_request *req)
1090 {
1091         return gcm_aes_crypt(req, CPACF_ENCRYPT);
1092 }
1093
1094 static int gcm_aes_decrypt(struct aead_request *req)
1095 {
1096         return gcm_aes_crypt(req, CPACF_DECRYPT);
1097 }
1098
1099 static struct aead_alg gcm_aes_aead = {
1100         .setkey                 = gcm_aes_setkey,
1101         .setauthsize            = gcm_aes_setauthsize,
1102         .encrypt                = gcm_aes_encrypt,
1103         .decrypt                = gcm_aes_decrypt,
1104
1105         .ivsize                 = GHASH_BLOCK_SIZE - sizeof(u32),
1106         .maxauthsize            = GHASH_DIGEST_SIZE,
1107         .chunksize              = AES_BLOCK_SIZE,
1108
1109         .base                   = {
1110                 .cra_blocksize          = 1,
1111                 .cra_ctxsize            = sizeof(struct s390_aes_ctx),
1112                 .cra_priority           = 900,
1113                 .cra_name               = "gcm(aes)",
1114                 .cra_driver_name        = "gcm-aes-s390",
1115                 .cra_module             = THIS_MODULE,
1116         },
1117 };
1118
1119 static struct crypto_alg *aes_s390_algs_ptr[5];
1120 static int aes_s390_algs_num;
1121 static struct aead_alg *aes_s390_aead_alg;
1122
1123 static int aes_s390_register_alg(struct crypto_alg *alg)
1124 {
1125         int ret;
1126
1127         ret = crypto_register_alg(alg);
1128         if (!ret)
1129                 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
1130         return ret;
1131 }
1132
1133 static void aes_s390_fini(void)
1134 {
1135         while (aes_s390_algs_num--)
1136                 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
1137         if (ctrblk)
1138                 free_page((unsigned long) ctrblk);
1139
1140         if (aes_s390_aead_alg)
1141                 crypto_unregister_aead(aes_s390_aead_alg);
1142 }
1143
1144 static int __init aes_s390_init(void)
1145 {
1146         int ret;
1147
1148         /* Query available functions for KM, KMC, KMCTR and KMA */
1149         cpacf_query(CPACF_KM, &km_functions);
1150         cpacf_query(CPACF_KMC, &kmc_functions);
1151         cpacf_query(CPACF_KMCTR, &kmctr_functions);
1152         cpacf_query(CPACF_KMA, &kma_functions);
1153
1154         if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1155             cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1156             cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1157                 ret = aes_s390_register_alg(&aes_alg);
1158                 if (ret)
1159                         goto out_err;
1160                 ret = aes_s390_register_alg(&ecb_aes_alg);
1161                 if (ret)
1162                         goto out_err;
1163         }
1164
1165         if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1166             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1167             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1168                 ret = aes_s390_register_alg(&cbc_aes_alg);
1169                 if (ret)
1170                         goto out_err;
1171         }
1172
1173         if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1174             cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1175                 ret = aes_s390_register_alg(&xts_aes_alg);
1176                 if (ret)
1177                         goto out_err;
1178         }
1179
1180         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1181             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1182             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1183                 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1184                 if (!ctrblk) {
1185                         ret = -ENOMEM;
1186                         goto out_err;
1187                 }
1188                 ret = aes_s390_register_alg(&ctr_aes_alg);
1189                 if (ret)
1190                         goto out_err;
1191         }
1192
1193         if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1194             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1195             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1196                 ret = crypto_register_aead(&gcm_aes_aead);
1197                 if (ret)
1198                         goto out_err;
1199                 aes_s390_aead_alg = &gcm_aes_aead;
1200         }
1201
1202         return 0;
1203 out_err:
1204         aes_s390_fini();
1205         return ret;
1206 }
1207
1208 module_cpu_feature_match(MSA, aes_s390_init);
1209 module_exit(aes_s390_fini);
1210
1211 MODULE_ALIAS_CRYPTO("aes-all");
1212
1213 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1214 MODULE_LICENSE("GPL");