drivers/crypto/nx/nx-aes-ccm.c

   1 /**
   2  * AES CCM routines supporting the Power 7+ Nest Accelerators driver
   3  *
   4  * Copyright (C) 2012 International Business Machines Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 only.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * Author: Kent Yoder <yoder1@us.ibm.com>
  20  */
  21
  22 #include <crypto/internal/aead.h>
  23 #include <crypto/aes.h>
  24 #include <crypto/algapi.h>
  25 #include <crypto/scatterwalk.h>
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/crypto.h>
  29 #include <asm/vio.h>
  30
  31 #include "nx_csbcpb.h"
  32 #include "nx.h"
  33
  34
  35 static int ccm_aes_nx_set_key(struct crypto_aead *tfm,
  36                               const u8           *in_key,
  37                               unsigned int        key_len)
  38 {
  39         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
  40         struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
  41         struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
  42
  43         nx_ctx_init(nx_ctx, HCOP_FC_AES);
  44
  45         switch (key_len) {
  46         case AES_KEYSIZE_128:
  47                 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
  48                 NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
  49                 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
  50                 break;
  51         default:
  52                 return -EINVAL;
  53         }
  54
  55         csbcpb->cpb.hdr.mode = NX_MODE_AES_CCM;
  56         memcpy(csbcpb->cpb.aes_ccm.key, in_key, key_len);
  57
  58         csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_CCA;
  59         memcpy(csbcpb_aead->cpb.aes_cca.key, in_key, key_len);
  60
  61         return 0;
  62
  63 }
  64
  65 static int ccm4309_aes_nx_set_key(struct crypto_aead *tfm,
  66                                   const u8           *in_key,
  67                                   unsigned int        key_len)
  68 {
  69         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
  70
  71         if (key_len < 3)
  72                 return -EINVAL;
  73
  74         key_len -= 3;
  75
  76         memcpy(nx_ctx->priv.ccm.nonce, in_key + key_len, 3);
  77
  78         return ccm_aes_nx_set_key(tfm, in_key, key_len);
  79 }
  80
  81 static int ccm_aes_nx_setauthsize(struct crypto_aead *tfm,
  82                                   unsigned int authsize)
  83 {
  84         switch (authsize) {
  85         case 4:
  86         case 6:
  87         case 8:
  88         case 10:
  89         case 12:
  90         case 14:
  91         case 16:
  92                 break;
  93         default:
  94                 return -EINVAL;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static int ccm4309_aes_nx_setauthsize(struct crypto_aead *tfm,
 101                                       unsigned int authsize)
 102 {
 103         switch (authsize) {
 104         case 8:
 105         case 12:
 106         case 16:
 107                 break;
 108         default:
 109                 return -EINVAL;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /* taken from crypto/ccm.c */
 116 static int set_msg_len(u8 *block, unsigned int msglen, int csize)
 117 {
 118         __be32 data;
 119
 120         memset(block, 0, csize);
 121         block += csize;
 122
 123         if (csize >= 4)
 124                 csize = 4;
 125         else if (msglen > (unsigned int)(1 << (8 * csize)))
 126                 return -EOVERFLOW;
 127
 128         data = cpu_to_be32(msglen);
 129         memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
 130
 131         return 0;
 132 }
 133
 134 /* taken from crypto/ccm.c */
 135 static inline int crypto_ccm_check_iv(const u8 *iv)
 136 {
 137         /* 2 <= L <= 8, so 1 <= L' <= 7. */
 138         if (1 > iv[0] || iv[0] > 7)
 139                 return -EINVAL;
 140
 141         return 0;
 142 }
 143
 144 /* based on code from crypto/ccm.c */
 145 static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
 146                        unsigned int cryptlen, u8 *b0)
 147 {
 148         unsigned int l, lp, m = authsize;
 149         int rc;
 150
 151         memcpy(b0, iv, 16);
 152
 153         lp = b0[0];
 154         l = lp + 1;
 155
 156         /* set m, bits 3-5 */
 157         *b0 |= (8 * ((m - 2) / 2));
 158
 159         /* set adata, bit 6, if associated data is used */
 160         if (assoclen)
 161                 *b0 |= 64;
 162
 163         rc = set_msg_len(b0 + 16 - l, cryptlen, l);
 164
 165         return rc;
 166 }
 167
 168 static int generate_pat(u8                   *iv,
 169                         struct aead_request  *req,
 170                         struct nx_crypto_ctx *nx_ctx,
 171                         unsigned int          authsize,
 172                         unsigned int          nbytes,
 173                         unsigned int          assoclen,
 174                         u8                   *out)
 175 {
 176         struct nx_sg *nx_insg = nx_ctx->in_sg;
 177         struct nx_sg *nx_outsg = nx_ctx->out_sg;
 178         unsigned int iauth_len = 0;
 179         u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
 180         int rc;
 181         unsigned int max_sg_len;
 182
 183         /* zero the ctr value */
 184         memset(iv + 15 - iv[0], 0, iv[0] + 1);
 185
 186         /* page 78 of nx_wb.pdf has,
 187          * Note: RFC3610 allows the AAD data to be up to 2^64 -1 bytes
 188          * in length. If a full message is used, the AES CCA implementation
 189          * restricts the maximum AAD length to 2^32 -1 bytes.
 190          * If partial messages are used, the implementation supports
 191          * 2^64 -1 bytes maximum AAD length.
 192          *
 193          * However, in the cryptoapi's aead_request structure,
 194          * assoclen is an unsigned int, thus it cannot hold a length
 195          * value greater than 2^32 - 1.
 196          * Thus the AAD is further constrained by this and is never
 197          * greater than 2^32.
 198          */
 199
 200         if (!assoclen) {
 201                 b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
 202         } else if (assoclen <= 14) {
 203                 /* if associated data is 14 bytes or less, we do 1 GCM
 204                  * operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
 205                  * which is fed in through the source buffers here */
 206                 b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
 207                 b1 = nx_ctx->priv.ccm.iauth_tag;
 208                 iauth_len = assoclen;
 209         } else if (assoclen <= 65280) {
 210                 /* if associated data is less than (2^16 - 2^8), we construct
 211                  * B1 differently and feed in the associated data to a CCA
 212                  * operation */
 213                 b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
 214                 b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
 215                 iauth_len = 14;
 216         } else {
 217                 b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
 218                 b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
 219                 iauth_len = 10;
 220         }
 221
 222         /* generate B0 */
 223         rc = generate_b0(iv, assoclen, authsize, nbytes, b0);
 224         if (rc)
 225                 return rc;
 226
 227         /* generate B1:
 228          * add control info for associated data
 229          * RFC 3610 and NIST Special Publication 800-38C
 230          */
 231         if (b1) {
 232                 memset(b1, 0, 16);
 233                 if (assoclen <= 65280) {
 234                         *(u16 *)b1 = assoclen;
 235                         scatterwalk_map_and_copy(b1 + 2, req->src, 0,
 236                                          iauth_len, SCATTERWALK_FROM_SG);
 237                 } else {
 238                         *(u16 *)b1 = (u16)(0xfffe);
 239                         *(u32 *)&b1[2] = assoclen;
 240                         scatterwalk_map_and_copy(b1 + 6, req->src, 0,
 241                                          iauth_len, SCATTERWALK_FROM_SG);
 242                 }
 243         }
 244
 245         /* now copy any remaining AAD to scatterlist and call nx... */
 246         if (!assoclen) {
 247                 return rc;
 248         } else if (assoclen <= 14) {
 249                 unsigned int len = 16;
 250
 251                 nx_insg = nx_build_sg_list(nx_insg, b1, &len, nx_ctx->ap->sglen);
 252
 253                 if (len != 16)
 254                         return -EINVAL;
 255
 256                 nx_outsg = nx_build_sg_list(nx_outsg, tmp, &len,
 257                                             nx_ctx->ap->sglen);
 258
 259                 if (len != 16)
 260                         return -EINVAL;
 261
 262                 /* inlen should be negative, indicating to phyp that its a
 263                  * pointer to an sg list */
 264                 nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
 265                                         sizeof(struct nx_sg);
 266                 nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
 267                                         sizeof(struct nx_sg);
 268
 269                 NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
 270                 NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;
 271
 272                 result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
 273
 274                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 275                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 276                 if (rc)
 277                         return rc;
 278
 279                 atomic_inc(&(nx_ctx->stats->aes_ops));
 280                 atomic64_add(assoclen, &nx_ctx->stats->aes_bytes);
 281
 282         } else {
 283                 unsigned int processed = 0, to_process;
 284
 285                 processed += iauth_len;
 286
 287                 /* page_limit: number of sg entries that fit on one page */
 288                 max_sg_len = min_t(u64, nx_ctx->ap->sglen,
 289                                 nx_driver.of.max_sg_len/sizeof(struct nx_sg));
 290                 max_sg_len = min_t(u64, max_sg_len,
 291                                 nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 292
 293                 do {
 294                         to_process = min_t(u32, assoclen - processed,
 295                                            nx_ctx->ap->databytelen);
 296
 297                         nx_insg = nx_walk_and_build(nx_ctx->in_sg,
 298                                                     nx_ctx->ap->sglen,
 299                                                     req->src, processed,
 300                                                     &to_process);
 301
 302                         if ((to_process + processed) < assoclen) {
 303                                 NX_CPB_FDM(nx_ctx->csbcpb_aead) |=
 304                                         NX_FDM_INTERMEDIATE;
 305                         } else {
 306                                 NX_CPB_FDM(nx_ctx->csbcpb_aead) &=
 307                                         ~NX_FDM_INTERMEDIATE;
 308                         }
 309
 310
 311                         nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
 312                                                 sizeof(struct nx_sg);
 313
 314                         result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
 315
 316                         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
 317                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 318                         if (rc)
 319                                 return rc;
 320
 321                         memcpy(nx_ctx->csbcpb_aead->cpb.aes_cca.b0,
 322                                 nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0,
 323                                 AES_BLOCK_SIZE);
 324
 325                         NX_CPB_FDM(nx_ctx->csbcpb_aead) |= NX_FDM_CONTINUATION;
 326
 327                         atomic_inc(&(nx_ctx->stats->aes_ops));
 328                         atomic64_add(assoclen, &nx_ctx->stats->aes_bytes);
 329
 330                         processed += to_process;
 331                 } while (processed < assoclen);
 332
 333                 result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
 334         }
 335
 336         memcpy(out, result, AES_BLOCK_SIZE);
 337
 338         return rc;
 339 }
 340
 341 static int ccm_nx_decrypt(struct aead_request   *req,
 342                           struct blkcipher_desc *desc,
 343                           unsigned int assoclen)
 344 {
 345         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 346         struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 347         unsigned int nbytes = req->cryptlen;
 348         unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
 349         struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
 350         unsigned long irq_flags;
 351         unsigned int processed = 0, to_process;
 352         int rc = -1;
 353
 354         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 355
 356         nbytes -= authsize;
 357
 358         /* copy out the auth tag to compare with later */
 359         scatterwalk_map_and_copy(priv->oauth_tag,
 360                                  req->src, nbytes + req->assoclen, authsize,
 361                                  SCATTERWALK_FROM_SG);
 362
 363         rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes, assoclen,
 364                           csbcpb->cpb.aes_ccm.in_pat_or_b0);
 365         if (rc)
 366                 goto out;
 367
 368         do {
 369
 370                 /* to_process: the AES_BLOCK_SIZE data chunk to process in this
 371                  * update. This value is bound by sg list limits.
 372                  */
 373                 to_process = nbytes - processed;
 374
 375                 if ((to_process + processed) < nbytes)
 376                         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 377                 else
 378                         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 379
 380                 NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
 381
 382                 rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
 383                                        &to_process, processed + req->assoclen,
 384                                        csbcpb->cpb.aes_ccm.iv_or_ctr);
 385                 if (rc)
 386                         goto out;
 387
 388                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 389                            req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 390                 if (rc)
 391                         goto out;
 392
 393                 /* for partial completion, copy following for next
 394                  * entry into loop...
 395                  */
 396                 memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 397                 memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 398                         csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 399                 memcpy(csbcpb->cpb.aes_ccm.in_s0,
 400                         csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
 401
 402                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 403
 404                 /* update stats */
 405                 atomic_inc(&(nx_ctx->stats->aes_ops));
 406                 atomic64_add(csbcpb->csb.processed_byte_count,
 407                              &(nx_ctx->stats->aes_bytes));
 408
 409                 processed += to_process;
 410         } while (processed < nbytes);
 411
 412         rc = crypto_memneq(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
 413                     authsize) ? -EBADMSG : 0;
 414 out:
 415         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 416         return rc;
 417 }
 418
 419 static int ccm_nx_encrypt(struct aead_request   *req,
 420                           struct blkcipher_desc *desc,
 421                           unsigned int assoclen)
 422 {
 423         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 424         struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 425         unsigned int nbytes = req->cryptlen;
 426         unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
 427         unsigned long irq_flags;
 428         unsigned int processed = 0, to_process;
 429         int rc = -1;
 430
 431         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 432
 433         rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes, assoclen,
 434                           csbcpb->cpb.aes_ccm.in_pat_or_b0);
 435         if (rc)
 436                 goto out;
 437
 438         do {
 439                 /* to process: the AES_BLOCK_SIZE data chunk to process in this
 440                  * update. This value is bound by sg list limits.
 441                  */
 442                 to_process = nbytes - processed;
 443
 444                 if ((to_process + processed) < nbytes)
 445                         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 446                 else
 447                         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 448
 449                 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
 450
 451                 rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
 452                                        &to_process, processed + req->assoclen,
 453                                        csbcpb->cpb.aes_ccm.iv_or_ctr);
 454                 if (rc)
 455                         goto out;
 456
 457                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 458                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 459                 if (rc)
 460                         goto out;
 461
 462                 /* for partial completion, copy following for next
 463                  * entry into loop...
 464                  */
 465                 memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 466                 memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 467                         csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 468                 memcpy(csbcpb->cpb.aes_ccm.in_s0,
 469                         csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
 470
 471                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 472
 473                 /* update stats */
 474                 atomic_inc(&(nx_ctx->stats->aes_ops));
 475                 atomic64_add(csbcpb->csb.processed_byte_count,
 476                              &(nx_ctx->stats->aes_bytes));
 477
 478                 processed += to_process;
 479
 480         } while (processed < nbytes);
 481
 482         /* copy out the auth tag */
 483         scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
 484                                  req->dst, nbytes + req->assoclen, authsize,
 485                                  SCATTERWALK_TO_SG);
 486
 487 out:
 488         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 489         return rc;
 490 }
 491
 492 static int ccm4309_aes_nx_encrypt(struct aead_request *req)
 493 {
 494         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 495         struct nx_gcm_rctx *rctx = aead_request_ctx(req);
 496         struct blkcipher_desc desc;
 497         u8 *iv = rctx->iv;
 498
 499         iv[0] = 3;
 500         memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 501         memcpy(iv + 4, req->iv, 8);
 502
 503         desc.info = iv;
 504
 505         return ccm_nx_encrypt(req, &desc, req->assoclen - 8);
 506 }
 507
 508 static int ccm_aes_nx_encrypt(struct aead_request *req)
 509 {
 510         struct blkcipher_desc desc;
 511         int rc;
 512
 513         desc.info = req->iv;
 514
 515         rc = crypto_ccm_check_iv(desc.info);
 516         if (rc)
 517                 return rc;
 518
 519         return ccm_nx_encrypt(req, &desc, req->assoclen);
 520 }
 521
 522 static int ccm4309_aes_nx_decrypt(struct aead_request *req)
 523 {
 524         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 525         struct nx_gcm_rctx *rctx = aead_request_ctx(req);
 526         struct blkcipher_desc desc;
 527         u8 *iv = rctx->iv;
 528
 529         iv[0] = 3;
 530         memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 531         memcpy(iv + 4, req->iv, 8);
 532
 533         desc.info = iv;
 534
 535         return ccm_nx_decrypt(req, &desc, req->assoclen - 8);
 536 }
 537
 538 static int ccm_aes_nx_decrypt(struct aead_request *req)
 539 {
 540         struct blkcipher_desc desc;
 541         int rc;
 542
 543         desc.info = req->iv;
 544
 545         rc = crypto_ccm_check_iv(desc.info);
 546         if (rc)
 547                 return rc;
 548
 549         return ccm_nx_decrypt(req, &desc, req->assoclen);
 550 }
 551
 552 /* tell the block cipher walk routines that this is a stream cipher by
 553  * setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
 554  * during encrypt/decrypt doesn't solve this problem, because it calls
 555  * blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
 556  * but instead uses this tfm->blocksize. */
 557 struct aead_alg nx_ccm_aes_alg = {
 558         .base = {
 559                 .cra_name        = "ccm(aes)",
 560                 .cra_driver_name = "ccm-aes-nx",
 561                 .cra_priority    = 300,
 562                 .cra_flags       = CRYPTO_ALG_NEED_FALLBACK,
 563                 .cra_blocksize   = 1,
 564                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 565                 .cra_module      = THIS_MODULE,
 566         },
 567         .init        = nx_crypto_ctx_aes_ccm_init,
 568         .exit        = nx_crypto_ctx_aead_exit,
 569         .ivsize      = AES_BLOCK_SIZE,
 570         .maxauthsize = AES_BLOCK_SIZE,
 571         .setkey      = ccm_aes_nx_set_key,
 572         .setauthsize = ccm_aes_nx_setauthsize,
 573         .encrypt     = ccm_aes_nx_encrypt,
 574         .decrypt     = ccm_aes_nx_decrypt,
 575 };
 576
 577 struct aead_alg nx_ccm4309_aes_alg = {
 578         .base = {
 579                 .cra_name        = "rfc4309(ccm(aes))",
 580                 .cra_driver_name = "rfc4309-ccm-aes-nx",
 581                 .cra_priority    = 300,
 582                 .cra_flags       = CRYPTO_ALG_NEED_FALLBACK,
 583                 .cra_blocksize   = 1,
 584                 .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 585                 .cra_module      = THIS_MODULE,
 586         },
 587         .init        = nx_crypto_ctx_aes_ccm_init,
 588         .exit        = nx_crypto_ctx_aead_exit,
 589         .ivsize      = 8,
 590         .maxauthsize = AES_BLOCK_SIZE,
 591         .setkey      = ccm4309_aes_nx_set_key,
 592         .setauthsize = ccm4309_aes_nx_setauthsize,
 593         .encrypt     = ccm4309_aes_nx_encrypt,
 594         .decrypt     = ccm4309_aes_nx_decrypt,
 595 };