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 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 = mutex_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                 mutex_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_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 inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
 838 {
 839         struct scatterlist *nextsg;
 840
 841         gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
 842         while (!gw->walk_bytes) {
 843                 nextsg = sg_next(gw->walk.sg);
 844                 if (!nextsg)
 845                         return 0;
 846                 scatterwalk_start(&gw->walk, nextsg);
 847                 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
 848                                                    gw->walk_bytes_remain);
 849         }
 850         gw->walk_ptr = scatterwalk_map(&gw->walk);
 851         return gw->walk_bytes;
 852 }
 853
 854 static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
 855                                              unsigned int nbytes)
 856 {
 857         gw->walk_bytes_remain -= nbytes;
 858         scatterwalk_unmap(&gw->walk);
 859         scatterwalk_advance(&gw->walk, nbytes);
 860         scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
 861         gw->walk_ptr = NULL;
 862 }
 863
 864 static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 865 {
 866         int n;
 867
 868         if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
 869                 gw->ptr = gw->buf;
 870                 gw->nbytes = gw->buf_bytes;
 871                 goto out;
 872         }
 873
 874         if (gw->walk_bytes_remain == 0) {
 875                 gw->ptr = NULL;
 876                 gw->nbytes = 0;
 877                 goto out;
 878         }
 879
 880         if (!_gcm_sg_clamp_and_map(gw)) {
 881                 gw->ptr = NULL;
 882                 gw->nbytes = 0;
 883                 goto out;
 884         }
 885
 886         if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
 887                 gw->ptr = gw->walk_ptr;
 888                 gw->nbytes = gw->walk_bytes;
 889                 goto out;
 890         }
 891
 892         while (1) {
 893                 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
 894                 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
 895                 gw->buf_bytes += n;
 896                 _gcm_sg_unmap_and_advance(gw, n);
 897                 if (gw->buf_bytes >= minbytesneeded) {
 898                         gw->ptr = gw->buf;
 899                         gw->nbytes = gw->buf_bytes;
 900                         goto out;
 901                 }
 902                 if (!_gcm_sg_clamp_and_map(gw)) {
 903                         gw->ptr = NULL;
 904                         gw->nbytes = 0;
 905                         goto out;
 906                 }
 907         }
 908
 909 out:
 910         return gw->nbytes;
 911 }
 912
 913 static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 914 {
 915         if (gw->walk_bytes_remain == 0) {
 916                 gw->ptr = NULL;
 917                 gw->nbytes = 0;
 918                 goto out;
 919         }
 920
 921         if (!_gcm_sg_clamp_and_map(gw)) {
 922                 gw->ptr = NULL;
 923                 gw->nbytes = 0;
 924                 goto out;
 925         }
 926
 927         if (gw->walk_bytes >= minbytesneeded) {
 928                 gw->ptr = gw->walk_ptr;
 929                 gw->nbytes = gw->walk_bytes;
 930                 goto out;
 931         }
 932
 933         scatterwalk_unmap(&gw->walk);
 934         gw->walk_ptr = NULL;
 935
 936         gw->ptr = gw->buf;
 937         gw->nbytes = sizeof(gw->buf);
 938
 939 out:
 940         return gw->nbytes;
 941 }
 942
 943 static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 944 {
 945         if (gw->ptr == NULL)
 946                 return 0;
 947
 948         if (gw->ptr == gw->buf) {
 949                 int n = gw->buf_bytes - bytesdone;
 950                 if (n > 0) {
 951                         memmove(gw->buf, gw->buf + bytesdone, n);
 952                         gw->buf_bytes = n;
 953                 } else
 954                         gw->buf_bytes = 0;
 955         } else
 956                 _gcm_sg_unmap_and_advance(gw, bytesdone);
 957
 958         return bytesdone;
 959 }
 960
 961 static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 962 {
 963         int i, n;
 964
 965         if (gw->ptr == NULL)
 966                 return 0;
 967
 968         if (gw->ptr == gw->buf) {
 969                 for (i = 0; i < bytesdone; i += n) {
 970                         if (!_gcm_sg_clamp_and_map(gw))
 971                                 return i;
 972                         n = min(gw->walk_bytes, bytesdone - i);
 973                         memcpy(gw->walk_ptr, gw->buf + i, n);
 974                         _gcm_sg_unmap_and_advance(gw, n);
 975                 }
 976         } else
 977                 _gcm_sg_unmap_and_advance(gw, bytesdone);
 978
 979         return bytesdone;
 980 }
 981
 982 static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
 983 {
 984         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 985         struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 986         unsigned int ivsize = crypto_aead_ivsize(tfm);
 987         unsigned int taglen = crypto_aead_authsize(tfm);
 988         unsigned int aadlen = req->assoclen;
 989         unsigned int pclen = req->cryptlen;
 990         int ret = 0;
 991
 992         unsigned int n, len, in_bytes, out_bytes,
 993                      min_bytes, bytes, aad_bytes, pc_bytes;
 994         struct gcm_sg_walk gw_in, gw_out;
 995         u8 tag[GHASH_DIGEST_SIZE];
 996
 997         struct {
 998                 u32 _[3];               /* reserved */
 999                 u32 cv;                 /* Counter Value */
1000                 u8 t[GHASH_DIGEST_SIZE];/* Tag */
1001                 u8 h[AES_BLOCK_SIZE];   /* Hash-subkey */
1002                 u64 taadl;              /* Total AAD Length */
1003                 u64 tpcl;               /* Total Plain-/Cipher-text Length */
1004                 u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
1005                 u8 k[AES_MAX_KEY_SIZE]; /* Key */
1006         } param;
1007
1008         /*
1009          * encrypt
1010          *   req->src: aad||plaintext
1011          *   req->dst: aad||ciphertext||tag
1012          * decrypt
1013          *   req->src: aad||ciphertext||tag
1014          *   req->dst: aad||plaintext, return 0 or -EBADMSG
1015          * aad, plaintext and ciphertext may be empty.
1016          */
1017         if (flags & CPACF_DECRYPT)
1018                 pclen -= taglen;
1019         len = aadlen + pclen;
1020
1021         memset(&param, 0, sizeof(param));
1022         param.cv = 1;
1023         param.taadl = aadlen * 8;
1024         param.tpcl = pclen * 8;
1025         memcpy(param.j0, req->iv, ivsize);
1026         *(u32 *)(param.j0 + ivsize) = 1;
1027         memcpy(param.k, ctx->key, ctx->key_len);
1028
1029         gcm_walk_start(&gw_in, req->src, len);
1030         gcm_walk_start(&gw_out, req->dst, len);
1031
1032         do {
1033                 min_bytes = min_t(unsigned int,
1034                                   aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
1035                 in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
1036                 out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
1037                 bytes = min(in_bytes, out_bytes);
1038
1039                 if (aadlen + pclen <= bytes) {
1040                         aad_bytes = aadlen;
1041                         pc_bytes = pclen;
1042                         flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
1043                 } else {
1044                         if (aadlen <= bytes) {
1045                                 aad_bytes = aadlen;
1046                                 pc_bytes = (bytes - aadlen) &
1047                                            ~(AES_BLOCK_SIZE - 1);
1048                                 flags |= CPACF_KMA_LAAD;
1049                         } else {
1050                                 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
1051                                 pc_bytes = 0;
1052                         }
1053                 }
1054
1055                 if (aad_bytes > 0)
1056                         memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
1057
1058                 cpacf_kma(ctx->fc | flags, &param,
1059                           gw_out.ptr + aad_bytes,
1060                           gw_in.ptr + aad_bytes, pc_bytes,
1061                           gw_in.ptr, aad_bytes);
1062
1063                 n = aad_bytes + pc_bytes;
1064                 if (gcm_in_walk_done(&gw_in, n) != n)
1065                         return -ENOMEM;
1066                 if (gcm_out_walk_done(&gw_out, n) != n)
1067                         return -ENOMEM;
1068                 aadlen -= aad_bytes;
1069                 pclen -= pc_bytes;
1070         } while (aadlen + pclen > 0);
1071
1072         if (flags & CPACF_DECRYPT) {
1073                 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1074                 if (crypto_memneq(tag, param.t, taglen))
1075                         ret = -EBADMSG;
1076         } else
1077                 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1078
1079         memzero_explicit(&param, sizeof(param));
1080         return ret;
1081 }
1082
1083 static int gcm_aes_encrypt(struct aead_request *req)
1084 {
1085         return gcm_aes_crypt(req, CPACF_ENCRYPT);
1086 }
1087
1088 static int gcm_aes_decrypt(struct aead_request *req)
1089 {
1090         return gcm_aes_crypt(req, CPACF_DECRYPT);
1091 }
1092
1093 static struct aead_alg gcm_aes_aead = {
1094         .setkey                 = gcm_aes_setkey,
1095         .setauthsize            = gcm_aes_setauthsize,
1096         .encrypt                = gcm_aes_encrypt,
1097         .decrypt                = gcm_aes_decrypt,
1098
1099         .ivsize                 = GHASH_BLOCK_SIZE - sizeof(u32),
1100         .maxauthsize            = GHASH_DIGEST_SIZE,
1101         .chunksize              = AES_BLOCK_SIZE,
1102
1103         .base                   = {
1104                 .cra_blocksize          = 1,
1105                 .cra_ctxsize            = sizeof(struct s390_aes_ctx),
1106                 .cra_priority           = 900,
1107                 .cra_name               = "gcm(aes)",
1108                 .cra_driver_name        = "gcm-aes-s390",
1109                 .cra_module             = THIS_MODULE,
1110         },
1111 };
1112
1113 static struct crypto_alg *aes_s390_algs_ptr[5];
1114 static int aes_s390_algs_num;
1115 static struct aead_alg *aes_s390_aead_alg;
1116
1117 static int aes_s390_register_alg(struct crypto_alg *alg)
1118 {
1119         int ret;
1120
1121         ret = crypto_register_alg(alg);
1122         if (!ret)
1123                 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
1124         return ret;
1125 }
1126
1127 static void aes_s390_fini(void)
1128 {
1129         while (aes_s390_algs_num--)
1130                 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
1131         if (ctrblk)
1132                 free_page((unsigned long) ctrblk);
1133
1134         if (aes_s390_aead_alg)
1135                 crypto_unregister_aead(aes_s390_aead_alg);
1136 }
1137
1138 static int __init aes_s390_init(void)
1139 {
1140         int ret;
1141
1142         /* Query available functions for KM, KMC, KMCTR and KMA */
1143         cpacf_query(CPACF_KM, &km_functions);
1144         cpacf_query(CPACF_KMC, &kmc_functions);
1145         cpacf_query(CPACF_KMCTR, &kmctr_functions);
1146         cpacf_query(CPACF_KMA, &kma_functions);
1147
1148         if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1149             cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1150             cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1151                 ret = aes_s390_register_alg(&aes_alg);
1152                 if (ret)
1153                         goto out_err;
1154                 ret = aes_s390_register_alg(&ecb_aes_alg);
1155                 if (ret)
1156                         goto out_err;
1157         }
1158
1159         if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1160             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1161             cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1162                 ret = aes_s390_register_alg(&cbc_aes_alg);
1163                 if (ret)
1164                         goto out_err;
1165         }
1166
1167         if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1168             cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1169                 ret = aes_s390_register_alg(&xts_aes_alg);
1170                 if (ret)
1171                         goto out_err;
1172         }
1173
1174         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1175             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1176             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1177                 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1178                 if (!ctrblk) {
1179                         ret = -ENOMEM;
1180                         goto out_err;
1181                 }
1182                 ret = aes_s390_register_alg(&ctr_aes_alg);
1183                 if (ret)
1184                         goto out_err;
1185         }
1186
1187         if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1188             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1189             cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1190                 ret = crypto_register_aead(&gcm_aes_aead);
1191                 if (ret)
1192                         goto out_err;
1193                 aes_s390_aead_alg = &gcm_aes_aead;
1194         }
1195
1196         return 0;
1197 out_err:
1198         aes_s390_fini();
1199         return ret;
1200 }
1201
1202 module_cpu_feature_match(MSA, aes_s390_init);
1203 module_exit(aes_s390_fini);
1204
1205 MODULE_ALIAS_CRYPTO("aes-all");
1206
1207 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1208 MODULE_LICENSE("GPL");