arch/s390/crypto/des_s390.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Cryptographic API.
   4  *
   5  * s390 implementation of the DES Cipher Algorithm.
   6  *
   7  * Copyright IBM Corp. 2003, 2011
   8  * Author(s): Thomas Spatzier
   9  *            Jan Glauber (jan.glauber@de.ibm.com)
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/cpufeature.h>
  15 #include <linux/crypto.h>
  16 #include <linux/fips.h>
  17 #include <crypto/algapi.h>
  18 #include <crypto/des.h>
  19 #include <asm/cpacf.h>
  20
  21 #define DES3_KEY_SIZE   (3 * DES_KEY_SIZE)
  22
  23 static u8 *ctrblk;
  24 static DEFINE_SPINLOCK(ctrblk_lock);
  25
  26 static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
  27
  28 struct s390_des_ctx {
  29         u8 iv[DES_BLOCK_SIZE];
  30         u8 key[DES3_KEY_SIZE];
  31 };
  32
  33 static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
  34                       unsigned int key_len)
  35 {
  36         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
  37         u32 tmp[DES_EXPKEY_WORDS];
  38
  39         /* check for weak keys */
  40         if (!des_ekey(tmp, key) &&
  41             (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
  42                 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
  43                 return -EINVAL;
  44         }
  45
  46         memcpy(ctx->key, key, key_len);
  47         return 0;
  48 }
  49
  50 static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  51 {
  52         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
  53
  54         cpacf_km(CPACF_KM_DEA, ctx->key, out, in, DES_BLOCK_SIZE);
  55 }
  56
  57 static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
  58 {
  59         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
  60
  61         cpacf_km(CPACF_KM_DEA | CPACF_DECRYPT,
  62                  ctx->key, out, in, DES_BLOCK_SIZE);
  63 }
  64
  65 static struct crypto_alg des_alg = {
  66         .cra_name               =       "des",
  67         .cra_driver_name        =       "des-s390",
  68         .cra_priority           =       300,
  69         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
  70         .cra_blocksize          =       DES_BLOCK_SIZE,
  71         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
  72         .cra_module             =       THIS_MODULE,
  73         .cra_u                  =       {
  74                 .cipher = {
  75                         .cia_min_keysize        =       DES_KEY_SIZE,
  76                         .cia_max_keysize        =       DES_KEY_SIZE,
  77                         .cia_setkey             =       des_setkey,
  78                         .cia_encrypt            =       des_encrypt,
  79                         .cia_decrypt            =       des_decrypt,
  80                 }
  81         }
  82 };
  83
  84 static int ecb_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
  85                             struct blkcipher_walk *walk)
  86 {
  87         struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  88         unsigned int nbytes, n;
  89         int ret;
  90
  91         ret = blkcipher_walk_virt(desc, walk);
  92         while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
  93                 /* only use complete blocks */
  94                 n = nbytes & ~(DES_BLOCK_SIZE - 1);
  95                 cpacf_km(fc, ctx->key, walk->dst.virt.addr,
  96                          walk->src.virt.addr, n);
  97                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
  98         }
  99         return ret;
 100 }
 101
 102 static int cbc_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
 103                             struct blkcipher_walk *walk)
 104 {
 105         struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 106         unsigned int nbytes, n;
 107         int ret;
 108         struct {
 109                 u8 iv[DES_BLOCK_SIZE];
 110                 u8 key[DES3_KEY_SIZE];
 111         } param;
 112
 113         ret = blkcipher_walk_virt(desc, walk);
 114         memcpy(param.iv, walk->iv, DES_BLOCK_SIZE);
 115         memcpy(param.key, ctx->key, DES3_KEY_SIZE);
 116         while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
 117                 /* only use complete blocks */
 118                 n = nbytes & ~(DES_BLOCK_SIZE - 1);
 119                 cpacf_kmc(fc, &param, walk->dst.virt.addr,
 120                           walk->src.virt.addr, n);
 121                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 122         }
 123         memcpy(walk->iv, param.iv, DES_BLOCK_SIZE);
 124         return ret;
 125 }
 126
 127 static int ecb_des_encrypt(struct blkcipher_desc *desc,
 128                            struct scatterlist *dst, struct scatterlist *src,
 129                            unsigned int nbytes)
 130 {
 131         struct blkcipher_walk walk;
 132
 133         blkcipher_walk_init(&walk, dst, src, nbytes);
 134         return ecb_desall_crypt(desc, CPACF_KM_DEA, &walk);
 135 }
 136
 137 static int ecb_des_decrypt(struct blkcipher_desc *desc,
 138                            struct scatterlist *dst, struct scatterlist *src,
 139                            unsigned int nbytes)
 140 {
 141         struct blkcipher_walk walk;
 142
 143         blkcipher_walk_init(&walk, dst, src, nbytes);
 144         return ecb_desall_crypt(desc, CPACF_KM_DEA | CPACF_DECRYPT, &walk);
 145 }
 146
 147 static struct crypto_alg ecb_des_alg = {
 148         .cra_name               =       "ecb(des)",
 149         .cra_driver_name        =       "ecb-des-s390",
 150         .cra_priority           =       400,    /* combo: des + ecb */
 151         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 152         .cra_blocksize          =       DES_BLOCK_SIZE,
 153         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 154         .cra_type               =       &crypto_blkcipher_type,
 155         .cra_module             =       THIS_MODULE,
 156         .cra_u                  =       {
 157                 .blkcipher = {
 158                         .min_keysize            =       DES_KEY_SIZE,
 159                         .max_keysize            =       DES_KEY_SIZE,
 160                         .setkey                 =       des_setkey,
 161                         .encrypt                =       ecb_des_encrypt,
 162                         .decrypt                =       ecb_des_decrypt,
 163                 }
 164         }
 165 };
 166
 167 static int cbc_des_encrypt(struct blkcipher_desc *desc,
 168                            struct scatterlist *dst, struct scatterlist *src,
 169                            unsigned int nbytes)
 170 {
 171         struct blkcipher_walk walk;
 172
 173         blkcipher_walk_init(&walk, dst, src, nbytes);
 174         return cbc_desall_crypt(desc, CPACF_KMC_DEA, &walk);
 175 }
 176
 177 static int cbc_des_decrypt(struct blkcipher_desc *desc,
 178                            struct scatterlist *dst, struct scatterlist *src,
 179                            unsigned int nbytes)
 180 {
 181         struct blkcipher_walk walk;
 182
 183         blkcipher_walk_init(&walk, dst, src, nbytes);
 184         return cbc_desall_crypt(desc, CPACF_KMC_DEA | CPACF_DECRYPT, &walk);
 185 }
 186
 187 static struct crypto_alg cbc_des_alg = {
 188         .cra_name               =       "cbc(des)",
 189         .cra_driver_name        =       "cbc-des-s390",
 190         .cra_priority           =       400,    /* combo: des + cbc */
 191         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 192         .cra_blocksize          =       DES_BLOCK_SIZE,
 193         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 194         .cra_type               =       &crypto_blkcipher_type,
 195         .cra_module             =       THIS_MODULE,
 196         .cra_u                  =       {
 197                 .blkcipher = {
 198                         .min_keysize            =       DES_KEY_SIZE,
 199                         .max_keysize            =       DES_KEY_SIZE,
 200                         .ivsize                 =       DES_BLOCK_SIZE,
 201                         .setkey                 =       des_setkey,
 202                         .encrypt                =       cbc_des_encrypt,
 203                         .decrypt                =       cbc_des_decrypt,
 204                 }
 205         }
 206 };
 207
 208 /*
 209  * RFC2451:
 210  *
 211  *   For DES-EDE3, there is no known need to reject weak or
 212  *   complementation keys.  Any weakness is obviated by the use of
 213  *   multiple keys.
 214  *
 215  *   However, if the first two or last two independent 64-bit keys are
 216  *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
 217  *   same as DES.  Implementers MUST reject keys that exhibit this
 218  *   property.
 219  *
 220  *   In fips mode additinally check for all 3 keys are unique.
 221  *
 222  */
 223 static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
 224                        unsigned int key_len)
 225 {
 226         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
 227
 228         if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
 229             crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
 230                           DES_KEY_SIZE)) &&
 231             (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
 232                 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
 233                 return -EINVAL;
 234         }
 235
 236         /* in fips mode, ensure k1 != k2 and k2 != k3 and k1 != k3 */
 237         if (fips_enabled &&
 238             !(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
 239               crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
 240                             DES_KEY_SIZE) &&
 241               crypto_memneq(key, &key[DES_KEY_SIZE * 2], DES_KEY_SIZE))) {
 242                 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
 243                 return -EINVAL;
 244         }
 245
 246         memcpy(ctx->key, key, key_len);
 247         return 0;
 248 }
 249
 250 static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 251 {
 252         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
 253
 254         cpacf_km(CPACF_KM_TDEA_192, ctx->key, dst, src, DES_BLOCK_SIZE);
 255 }
 256
 257 static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 258 {
 259         struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
 260
 261         cpacf_km(CPACF_KM_TDEA_192 | CPACF_DECRYPT,
 262                  ctx->key, dst, src, DES_BLOCK_SIZE);
 263 }
 264
 265 static struct crypto_alg des3_alg = {
 266         .cra_name               =       "des3_ede",
 267         .cra_driver_name        =       "des3_ede-s390",
 268         .cra_priority           =       300,
 269         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
 270         .cra_blocksize          =       DES_BLOCK_SIZE,
 271         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 272         .cra_module             =       THIS_MODULE,
 273         .cra_u                  =       {
 274                 .cipher = {
 275                         .cia_min_keysize        =       DES3_KEY_SIZE,
 276                         .cia_max_keysize        =       DES3_KEY_SIZE,
 277                         .cia_setkey             =       des3_setkey,
 278                         .cia_encrypt            =       des3_encrypt,
 279                         .cia_decrypt            =       des3_decrypt,
 280                 }
 281         }
 282 };
 283
 284 static int ecb_des3_encrypt(struct blkcipher_desc *desc,
 285                             struct scatterlist *dst, struct scatterlist *src,
 286                             unsigned int nbytes)
 287 {
 288         struct blkcipher_walk walk;
 289
 290         blkcipher_walk_init(&walk, dst, src, nbytes);
 291         return ecb_desall_crypt(desc, CPACF_KM_TDEA_192, &walk);
 292 }
 293
 294 static int ecb_des3_decrypt(struct blkcipher_desc *desc,
 295                             struct scatterlist *dst, struct scatterlist *src,
 296                             unsigned int nbytes)
 297 {
 298         struct blkcipher_walk walk;
 299
 300         blkcipher_walk_init(&walk, dst, src, nbytes);
 301         return ecb_desall_crypt(desc, CPACF_KM_TDEA_192 | CPACF_DECRYPT,
 302                                 &walk);
 303 }
 304
 305 static struct crypto_alg ecb_des3_alg = {
 306         .cra_name               =       "ecb(des3_ede)",
 307         .cra_driver_name        =       "ecb-des3_ede-s390",
 308         .cra_priority           =       400,    /* combo: des3 + ecb */
 309         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 310         .cra_blocksize          =       DES_BLOCK_SIZE,
 311         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 312         .cra_type               =       &crypto_blkcipher_type,
 313         .cra_module             =       THIS_MODULE,
 314         .cra_u                  =       {
 315                 .blkcipher = {
 316                         .min_keysize            =       DES3_KEY_SIZE,
 317                         .max_keysize            =       DES3_KEY_SIZE,
 318                         .setkey                 =       des3_setkey,
 319                         .encrypt                =       ecb_des3_encrypt,
 320                         .decrypt                =       ecb_des3_decrypt,
 321                 }
 322         }
 323 };
 324
 325 static int cbc_des3_encrypt(struct blkcipher_desc *desc,
 326                             struct scatterlist *dst, struct scatterlist *src,
 327                             unsigned int nbytes)
 328 {
 329         struct blkcipher_walk walk;
 330
 331         blkcipher_walk_init(&walk, dst, src, nbytes);
 332         return cbc_desall_crypt(desc, CPACF_KMC_TDEA_192, &walk);
 333 }
 334
 335 static int cbc_des3_decrypt(struct blkcipher_desc *desc,
 336                             struct scatterlist *dst, struct scatterlist *src,
 337                             unsigned int nbytes)
 338 {
 339         struct blkcipher_walk walk;
 340
 341         blkcipher_walk_init(&walk, dst, src, nbytes);
 342         return cbc_desall_crypt(desc, CPACF_KMC_TDEA_192 | CPACF_DECRYPT,
 343                                 &walk);
 344 }
 345
 346 static struct crypto_alg cbc_des3_alg = {
 347         .cra_name               =       "cbc(des3_ede)",
 348         .cra_driver_name        =       "cbc-des3_ede-s390",
 349         .cra_priority           =       400,    /* combo: des3 + cbc */
 350         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 351         .cra_blocksize          =       DES_BLOCK_SIZE,
 352         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 353         .cra_type               =       &crypto_blkcipher_type,
 354         .cra_module             =       THIS_MODULE,
 355         .cra_u                  =       {
 356                 .blkcipher = {
 357                         .min_keysize            =       DES3_KEY_SIZE,
 358                         .max_keysize            =       DES3_KEY_SIZE,
 359                         .ivsize                 =       DES_BLOCK_SIZE,
 360                         .setkey                 =       des3_setkey,
 361                         .encrypt                =       cbc_des3_encrypt,
 362                         .decrypt                =       cbc_des3_decrypt,
 363                 }
 364         }
 365 };
 366
 367 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
 368 {
 369         unsigned int i, n;
 370
 371         /* align to block size, max. PAGE_SIZE */
 372         n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
 373         memcpy(ctrptr, iv, DES_BLOCK_SIZE);
 374         for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) {
 375                 memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE);
 376                 crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE);
 377                 ctrptr += DES_BLOCK_SIZE;
 378         }
 379         return n;
 380 }
 381
 382 static int ctr_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
 383                             struct blkcipher_walk *walk)
 384 {
 385         struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 386         u8 buf[DES_BLOCK_SIZE], *ctrptr;
 387         unsigned int n, nbytes;
 388         int ret, locked;
 389
 390         locked = spin_trylock(&ctrblk_lock);
 391
 392         ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
 393         while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
 394                 n = DES_BLOCK_SIZE;
 395                 if (nbytes >= 2*DES_BLOCK_SIZE && locked)
 396                         n = __ctrblk_init(ctrblk, walk->iv, nbytes);
 397                 ctrptr = (n > DES_BLOCK_SIZE) ? ctrblk : walk->iv;
 398                 cpacf_kmctr(fc, ctx->key, walk->dst.virt.addr,
 399                             walk->src.virt.addr, n, ctrptr);
 400                 if (ctrptr == ctrblk)
 401                         memcpy(walk->iv, ctrptr + n - DES_BLOCK_SIZE,
 402                                 DES_BLOCK_SIZE);
 403                 crypto_inc(walk->iv, DES_BLOCK_SIZE);
 404                 ret = blkcipher_walk_done(desc, walk, nbytes - n);
 405         }
 406         if (locked)
 407                 spin_unlock(&ctrblk_lock);
 408         /* final block may be < DES_BLOCK_SIZE, copy only nbytes */
 409         if (nbytes) {
 410                 cpacf_kmctr(fc, ctx->key, buf, walk->src.virt.addr,
 411                             DES_BLOCK_SIZE, walk->iv);
 412                 memcpy(walk->dst.virt.addr, buf, nbytes);
 413                 crypto_inc(walk->iv, DES_BLOCK_SIZE);
 414                 ret = blkcipher_walk_done(desc, walk, 0);
 415         }
 416         return ret;
 417 }
 418
 419 static int ctr_des_encrypt(struct blkcipher_desc *desc,
 420                            struct scatterlist *dst, struct scatterlist *src,
 421                            unsigned int nbytes)
 422 {
 423         struct blkcipher_walk walk;
 424
 425         blkcipher_walk_init(&walk, dst, src, nbytes);
 426         return ctr_desall_crypt(desc, CPACF_KMCTR_DEA, &walk);
 427 }
 428
 429 static int ctr_des_decrypt(struct blkcipher_desc *desc,
 430                            struct scatterlist *dst, struct scatterlist *src,
 431                            unsigned int nbytes)
 432 {
 433         struct blkcipher_walk walk;
 434
 435         blkcipher_walk_init(&walk, dst, src, nbytes);
 436         return ctr_desall_crypt(desc, CPACF_KMCTR_DEA | CPACF_DECRYPT, &walk);
 437 }
 438
 439 static struct crypto_alg ctr_des_alg = {
 440         .cra_name               =       "ctr(des)",
 441         .cra_driver_name        =       "ctr-des-s390",
 442         .cra_priority           =       400,    /* combo: des + ctr */
 443         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 444         .cra_blocksize          =       1,
 445         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 446         .cra_type               =       &crypto_blkcipher_type,
 447         .cra_module             =       THIS_MODULE,
 448         .cra_u                  =       {
 449                 .blkcipher = {
 450                         .min_keysize            =       DES_KEY_SIZE,
 451                         .max_keysize            =       DES_KEY_SIZE,
 452                         .ivsize                 =       DES_BLOCK_SIZE,
 453                         .setkey                 =       des_setkey,
 454                         .encrypt                =       ctr_des_encrypt,
 455                         .decrypt                =       ctr_des_decrypt,
 456                 }
 457         }
 458 };
 459
 460 static int ctr_des3_encrypt(struct blkcipher_desc *desc,
 461                             struct scatterlist *dst, struct scatterlist *src,
 462                             unsigned int nbytes)
 463 {
 464         struct blkcipher_walk walk;
 465
 466         blkcipher_walk_init(&walk, dst, src, nbytes);
 467         return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192, &walk);
 468 }
 469
 470 static int ctr_des3_decrypt(struct blkcipher_desc *desc,
 471                             struct scatterlist *dst, struct scatterlist *src,
 472                             unsigned int nbytes)
 473 {
 474         struct blkcipher_walk walk;
 475
 476         blkcipher_walk_init(&walk, dst, src, nbytes);
 477         return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192 | CPACF_DECRYPT,
 478                                 &walk);
 479 }
 480
 481 static struct crypto_alg ctr_des3_alg = {
 482         .cra_name               =       "ctr(des3_ede)",
 483         .cra_driver_name        =       "ctr-des3_ede-s390",
 484         .cra_priority           =       400,    /* combo: des3 + ede */
 485         .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
 486         .cra_blocksize          =       1,
 487         .cra_ctxsize            =       sizeof(struct s390_des_ctx),
 488         .cra_type               =       &crypto_blkcipher_type,
 489         .cra_module             =       THIS_MODULE,
 490         .cra_u                  =       {
 491                 .blkcipher = {
 492                         .min_keysize            =       DES3_KEY_SIZE,
 493                         .max_keysize            =       DES3_KEY_SIZE,
 494                         .ivsize                 =       DES_BLOCK_SIZE,
 495                         .setkey                 =       des3_setkey,
 496                         .encrypt                =       ctr_des3_encrypt,
 497                         .decrypt                =       ctr_des3_decrypt,
 498                 }
 499         }
 500 };
 501
 502 static struct crypto_alg *des_s390_algs_ptr[8];
 503 static int des_s390_algs_num;
 504
 505 static int des_s390_register_alg(struct crypto_alg *alg)
 506 {
 507         int ret;
 508
 509         ret = crypto_register_alg(alg);
 510         if (!ret)
 511                 des_s390_algs_ptr[des_s390_algs_num++] = alg;
 512         return ret;
 513 }
 514
 515 static void des_s390_exit(void)
 516 {
 517         while (des_s390_algs_num--)
 518                 crypto_unregister_alg(des_s390_algs_ptr[des_s390_algs_num]);
 519         if (ctrblk)
 520                 free_page((unsigned long) ctrblk);
 521 }
 522
 523 static int __init des_s390_init(void)
 524 {
 525         int ret;
 526
 527         /* Query available functions for KM, KMC and KMCTR */
 528         cpacf_query(CPACF_KM, &km_functions);
 529         cpacf_query(CPACF_KMC, &kmc_functions);
 530         cpacf_query(CPACF_KMCTR, &kmctr_functions);
 531
 532         if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) {
 533                 ret = des_s390_register_alg(&des_alg);
 534                 if (ret)
 535                         goto out_err;
 536                 ret = des_s390_register_alg(&ecb_des_alg);
 537                 if (ret)
 538                         goto out_err;
 539         }
 540         if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) {
 541                 ret = des_s390_register_alg(&cbc_des_alg);
 542                 if (ret)
 543                         goto out_err;
 544         }
 545         if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) {
 546                 ret = des_s390_register_alg(&des3_alg);
 547                 if (ret)
 548                         goto out_err;
 549                 ret = des_s390_register_alg(&ecb_des3_alg);
 550                 if (ret)
 551                         goto out_err;
 552         }
 553         if (cpacf_test_func(&kmc_functions, CPACF_KMC_TDEA_192)) {
 554                 ret = des_s390_register_alg(&cbc_des3_alg);
 555                 if (ret)
 556                         goto out_err;
 557         }
 558
 559         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA) ||
 560             cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
 561                 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
 562                 if (!ctrblk) {
 563                         ret = -ENOMEM;
 564                         goto out_err;
 565                 }
 566         }
 567
 568         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA)) {
 569                 ret = des_s390_register_alg(&ctr_des_alg);
 570                 if (ret)
 571                         goto out_err;
 572         }
 573         if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
 574                 ret = des_s390_register_alg(&ctr_des3_alg);
 575                 if (ret)
 576                         goto out_err;
 577         }
 578
 579         return 0;
 580 out_err:
 581         des_s390_exit();
 582         return ret;
 583 }
 584
 585 module_cpu_feature_match(MSA, des_s390_init);
 586 module_exit(des_s390_exit);
 587
 588 MODULE_ALIAS_CRYPTO("des");
 589 MODULE_ALIAS_CRYPTO("des3_ede");
 590
 591 MODULE_LICENSE("GPL");
 592 MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");