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         crypto_aead_crt(tfm)->authsize = authsize;
  98
  99         return 0;
 100 }
 101
 102 static int ccm4309_aes_nx_setauthsize(struct crypto_aead *tfm,
 103                                       unsigned int authsize)
 104 {
 105         switch (authsize) {
 106         case 8:
 107         case 12:
 108         case 16:
 109                 break;
 110         default:
 111                 return -EINVAL;
 112         }
 113
 114         crypto_aead_crt(tfm)->authsize = authsize;
 115
 116         return 0;
 117 }
 118
 119 /* taken from crypto/ccm.c */
 120 static int set_msg_len(u8 *block, unsigned int msglen, int csize)
 121 {
 122         __be32 data;
 123
 124         memset(block, 0, csize);
 125         block += csize;
 126
 127         if (csize >= 4)
 128                 csize = 4;
 129         else if (msglen > (unsigned int)(1 << (8 * csize)))
 130                 return -EOVERFLOW;
 131
 132         data = cpu_to_be32(msglen);
 133         memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
 134
 135         return 0;
 136 }
 137
 138 /* taken from crypto/ccm.c */
 139 static inline int crypto_ccm_check_iv(const u8 *iv)
 140 {
 141         /* 2 <= L <= 8, so 1 <= L' <= 7. */
 142         if (1 > iv[0] || iv[0] > 7)
 143                 return -EINVAL;
 144
 145         return 0;
 146 }
 147
 148 /* based on code from crypto/ccm.c */
 149 static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
 150                        unsigned int cryptlen, u8 *b0)
 151 {
 152         unsigned int l, lp, m = authsize;
 153         int rc;
 154
 155         memcpy(b0, iv, 16);
 156
 157         lp = b0[0];
 158         l = lp + 1;
 159
 160         /* set m, bits 3-5 */
 161         *b0 |= (8 * ((m - 2) / 2));
 162
 163         /* set adata, bit 6, if associated data is used */
 164         if (assoclen)
 165                 *b0 |= 64;
 166
 167         rc = set_msg_len(b0 + 16 - l, cryptlen, l);
 168
 169         return rc;
 170 }
 171
 172 static int generate_pat(u8                   *iv,
 173                         struct aead_request  *req,
 174                         struct nx_crypto_ctx *nx_ctx,
 175                         unsigned int          authsize,
 176                         unsigned int          nbytes,
 177                         u8                   *out)
 178 {
 179         struct nx_sg *nx_insg = nx_ctx->in_sg;
 180         struct nx_sg *nx_outsg = nx_ctx->out_sg;
 181         unsigned int iauth_len = 0;
 182         u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
 183         int rc;
 184         unsigned int max_sg_len;
 185
 186         /* zero the ctr value */
 187         memset(iv + 15 - iv[0], 0, iv[0] + 1);
 188
 189         /* page 78 of nx_wb.pdf has,
 190          * Note: RFC3610 allows the AAD data to be up to 2^64 -1 bytes
 191          * in length. If a full message is used, the AES CCA implementation
 192          * restricts the maximum AAD length to 2^32 -1 bytes.
 193          * If partial messages are used, the implementation supports
 194          * 2^64 -1 bytes maximum AAD length.
 195          *
 196          * However, in the cryptoapi's aead_request structure,
 197          * assoclen is an unsigned int, thus it cannot hold a length
 198          * value greater than 2^32 - 1.
 199          * Thus the AAD is further constrained by this and is never
 200          * greater than 2^32.
 201          */
 202
 203         if (!req->assoclen) {
 204                 b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
 205         } else if (req->assoclen <= 14) {
 206                 /* if associated data is 14 bytes or less, we do 1 GCM
 207                  * operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
 208                  * which is fed in through the source buffers here */
 209                 b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
 210                 b1 = nx_ctx->priv.ccm.iauth_tag;
 211                 iauth_len = req->assoclen;
 212         } else if (req->assoclen <= 65280) {
 213                 /* if associated data is less than (2^16 - 2^8), we construct
 214                  * B1 differently and feed in the associated data to a CCA
 215                  * operation */
 216                 b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
 217                 b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
 218                 iauth_len = 14;
 219         } else {
 220                 b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
 221                 b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
 222                 iauth_len = 10;
 223         }
 224
 225         /* generate B0 */
 226         rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
 227         if (rc)
 228                 return rc;
 229
 230         /* generate B1:
 231          * add control info for associated data
 232          * RFC 3610 and NIST Special Publication 800-38C
 233          */
 234         if (b1) {
 235                 memset(b1, 0, 16);
 236                 if (req->assoclen <= 65280) {
 237                         *(u16 *)b1 = (u16)req->assoclen;
 238                         scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
 239                                          iauth_len, SCATTERWALK_FROM_SG);
 240                 } else {
 241                         *(u16 *)b1 = (u16)(0xfffe);
 242                         *(u32 *)&b1[2] = (u32)req->assoclen;
 243                         scatterwalk_map_and_copy(b1 + 6, req->assoc, 0,
 244                                          iauth_len, SCATTERWALK_FROM_SG);
 245                 }
 246         }
 247
 248         /* now copy any remaining AAD to scatterlist and call nx... */
 249         if (!req->assoclen) {
 250                 return rc;
 251         } else if (req->assoclen <= 14) {
 252                 unsigned int len = 16;
 253
 254                 nx_insg = nx_build_sg_list(nx_insg, b1, &len, nx_ctx->ap->sglen);
 255
 256                 if (len != 16)
 257                         return -EINVAL;
 258
 259                 nx_outsg = nx_build_sg_list(nx_outsg, tmp, &len,
 260                                             nx_ctx->ap->sglen);
 261
 262                 if (len != 16)
 263                         return -EINVAL;
 264
 265                 /* inlen should be negative, indicating to phyp that its a
 266                  * pointer to an sg list */
 267                 nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
 268                                         sizeof(struct nx_sg);
 269                 nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
 270                                         sizeof(struct nx_sg);
 271
 272                 NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
 273                 NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;
 274
 275                 result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
 276
 277                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 278                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 279                 if (rc)
 280                         return rc;
 281
 282                 atomic_inc(&(nx_ctx->stats->aes_ops));
 283                 atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
 284
 285         } else {
 286                 unsigned int processed = 0, to_process;
 287
 288                 processed += iauth_len;
 289
 290                 /* page_limit: number of sg entries that fit on one page */
 291                 max_sg_len = min_t(u64, nx_ctx->ap->sglen,
 292                                 nx_driver.of.max_sg_len/sizeof(struct nx_sg));
 293                 max_sg_len = min_t(u64, max_sg_len,
 294                                 nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 295
 296                 do {
 297                         to_process = min_t(u32, req->assoclen - processed,
 298                                            nx_ctx->ap->databytelen);
 299
 300                         nx_insg = nx_walk_and_build(nx_ctx->in_sg,
 301                                                     nx_ctx->ap->sglen,
 302                                                     req->assoc, processed,
 303                                                     &to_process);
 304
 305                         if ((to_process + processed) < req->assoclen) {
 306                                 NX_CPB_FDM(nx_ctx->csbcpb_aead) |=
 307                                         NX_FDM_INTERMEDIATE;
 308                         } else {
 309                                 NX_CPB_FDM(nx_ctx->csbcpb_aead) &=
 310                                         ~NX_FDM_INTERMEDIATE;
 311                         }
 312
 313
 314                         nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
 315                                                 sizeof(struct nx_sg);
 316
 317                         result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
 318
 319                         rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
 320                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 321                         if (rc)
 322                                 return rc;
 323
 324                         memcpy(nx_ctx->csbcpb_aead->cpb.aes_cca.b0,
 325                                 nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0,
 326                                 AES_BLOCK_SIZE);
 327
 328                         NX_CPB_FDM(nx_ctx->csbcpb_aead) |= NX_FDM_CONTINUATION;
 329
 330                         atomic_inc(&(nx_ctx->stats->aes_ops));
 331                         atomic64_add(req->assoclen,
 332                                         &(nx_ctx->stats->aes_bytes));
 333
 334                         processed += to_process;
 335                 } while (processed < req->assoclen);
 336
 337                 result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
 338         }
 339
 340         memcpy(out, result, AES_BLOCK_SIZE);
 341
 342         return rc;
 343 }
 344
 345 static int ccm_nx_decrypt(struct aead_request   *req,
 346                           struct blkcipher_desc *desc)
 347 {
 348         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 349         struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 350         unsigned int nbytes = req->cryptlen;
 351         unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
 352         struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
 353         unsigned long irq_flags;
 354         unsigned int processed = 0, to_process;
 355         int rc = -1;
 356
 357         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 358
 359         nbytes -= authsize;
 360
 361         /* copy out the auth tag to compare with later */
 362         scatterwalk_map_and_copy(priv->oauth_tag,
 363                                  req->src, nbytes, authsize,
 364                                  SCATTERWALK_FROM_SG);
 365
 366         rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
 367                           csbcpb->cpb.aes_ccm.in_pat_or_b0);
 368         if (rc)
 369                 goto out;
 370
 371         do {
 372
 373                 /* to_process: the AES_BLOCK_SIZE data chunk to process in this
 374                  * update. This value is bound by sg list limits.
 375                  */
 376                 to_process = nbytes - processed;
 377
 378                 if ((to_process + processed) < nbytes)
 379                         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 380                 else
 381                         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 382
 383                 NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
 384
 385                 rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
 386                                         &to_process, processed,
 387                                         csbcpb->cpb.aes_ccm.iv_or_ctr);
 388                 if (rc)
 389                         goto out;
 390
 391                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 392                            req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 393                 if (rc)
 394                         goto out;
 395
 396                 /* for partial completion, copy following for next
 397                  * entry into loop...
 398                  */
 399                 memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 400                 memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 401                         csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 402                 memcpy(csbcpb->cpb.aes_ccm.in_s0,
 403                         csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
 404
 405                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 406
 407                 /* update stats */
 408                 atomic_inc(&(nx_ctx->stats->aes_ops));
 409                 atomic64_add(csbcpb->csb.processed_byte_count,
 410                              &(nx_ctx->stats->aes_bytes));
 411
 412                 processed += to_process;
 413         } while (processed < nbytes);
 414
 415         rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
 416                     authsize) ? -EBADMSG : 0;
 417 out:
 418         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 419         return rc;
 420 }
 421
 422 static int ccm_nx_encrypt(struct aead_request   *req,
 423                           struct blkcipher_desc *desc)
 424 {
 425         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 426         struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 427         unsigned int nbytes = req->cryptlen;
 428         unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
 429         unsigned long irq_flags;
 430         unsigned int processed = 0, to_process;
 431         int rc = -1;
 432
 433         spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 434
 435         rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
 436                           csbcpb->cpb.aes_ccm.in_pat_or_b0);
 437         if (rc)
 438                 goto out;
 439
 440         do {
 441                 /* to process: the AES_BLOCK_SIZE data chunk to process in this
 442                  * update. This value is bound by sg list limits.
 443                  */
 444                 to_process = nbytes - processed;
 445
 446                 if ((to_process + processed) < nbytes)
 447                         NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 448                 else
 449                         NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 450
 451                 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
 452
 453                 rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
 454                                         &to_process, processed,
 455                                        csbcpb->cpb.aes_ccm.iv_or_ctr);
 456                 if (rc)
 457                         goto out;
 458
 459                 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 460                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 461                 if (rc)
 462                         goto out;
 463
 464                 /* for partial completion, copy following for next
 465                  * entry into loop...
 466                  */
 467                 memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 468                 memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 469                         csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 470                 memcpy(csbcpb->cpb.aes_ccm.in_s0,
 471                         csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
 472
 473                 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 474
 475                 /* update stats */
 476                 atomic_inc(&(nx_ctx->stats->aes_ops));
 477                 atomic64_add(csbcpb->csb.processed_byte_count,
 478                              &(nx_ctx->stats->aes_bytes));
 479
 480                 processed += to_process;
 481
 482         } while (processed < nbytes);
 483
 484         /* copy out the auth tag */
 485         scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
 486                                  req->dst, nbytes, authsize,
 487                                  SCATTERWALK_TO_SG);
 488
 489 out:
 490         spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 491         return rc;
 492 }
 493
 494 static int ccm4309_aes_nx_encrypt(struct aead_request *req)
 495 {
 496         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 497         struct nx_gcm_rctx *rctx = aead_request_ctx(req);
 498         struct blkcipher_desc desc;
 499         u8 *iv = rctx->iv;
 500
 501         iv[0] = 3;
 502         memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 503         memcpy(iv + 4, req->iv, 8);
 504
 505         desc.info = iv;
 506         desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
 507
 508         return ccm_nx_encrypt(req, &desc);
 509 }
 510
 511 static int ccm_aes_nx_encrypt(struct aead_request *req)
 512 {
 513         struct blkcipher_desc desc;
 514         int rc;
 515
 516         desc.info = req->iv;
 517         desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
 518
 519         rc = crypto_ccm_check_iv(desc.info);
 520         if (rc)
 521                 return rc;
 522
 523         return ccm_nx_encrypt(req, &desc);
 524 }
 525
 526 static int ccm4309_aes_nx_decrypt(struct aead_request *req)
 527 {
 528         struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 529         struct nx_gcm_rctx *rctx = aead_request_ctx(req);
 530         struct blkcipher_desc desc;
 531         u8 *iv = rctx->iv;
 532
 533         iv[0] = 3;
 534         memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 535         memcpy(iv + 4, req->iv, 8);
 536
 537         desc.info = iv;
 538         desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
 539
 540         return ccm_nx_decrypt(req, &desc);
 541 }
 542
 543 static int ccm_aes_nx_decrypt(struct aead_request *req)
 544 {
 545         struct blkcipher_desc desc;
 546         int rc;
 547
 548         desc.info = req->iv;
 549         desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
 550
 551         rc = crypto_ccm_check_iv(desc.info);
 552         if (rc)
 553                 return rc;
 554
 555         return ccm_nx_decrypt(req, &desc);
 556 }
 557
 558 /* tell the block cipher walk routines that this is a stream cipher by
 559  * setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
 560  * during encrypt/decrypt doesn't solve this problem, because it calls
 561  * blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
 562  * but instead uses this tfm->blocksize. */
 563 struct crypto_alg nx_ccm_aes_alg = {
 564         .cra_name        = "ccm(aes)",
 565         .cra_driver_name = "ccm-aes-nx",
 566         .cra_priority    = 300,
 567         .cra_flags       = CRYPTO_ALG_TYPE_AEAD |
 568                            CRYPTO_ALG_NEED_FALLBACK,
 569         .cra_blocksize   = 1,
 570         .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 571         .cra_type        = &crypto_aead_type,
 572         .cra_module      = THIS_MODULE,
 573         .cra_init        = nx_crypto_ctx_aes_ccm_init,
 574         .cra_exit        = nx_crypto_ctx_exit,
 575         .cra_aead = {
 576                 .ivsize      = AES_BLOCK_SIZE,
 577                 .maxauthsize = AES_BLOCK_SIZE,
 578                 .setkey      = ccm_aes_nx_set_key,
 579                 .setauthsize = ccm_aes_nx_setauthsize,
 580                 .encrypt     = ccm_aes_nx_encrypt,
 581                 .decrypt     = ccm_aes_nx_decrypt,
 582         }
 583 };
 584
 585 struct crypto_alg nx_ccm4309_aes_alg = {
 586         .cra_name        = "rfc4309(ccm(aes))",
 587         .cra_driver_name = "rfc4309-ccm-aes-nx",
 588         .cra_priority    = 300,
 589         .cra_flags       = CRYPTO_ALG_TYPE_AEAD |
 590                            CRYPTO_ALG_NEED_FALLBACK,
 591         .cra_blocksize   = 1,
 592         .cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 593         .cra_type        = &crypto_nivaead_type,
 594         .cra_module      = THIS_MODULE,
 595         .cra_init        = nx_crypto_ctx_aes_ccm_init,
 596         .cra_exit        = nx_crypto_ctx_exit,
 597         .cra_aead = {
 598                 .ivsize      = 8,
 599                 .maxauthsize = AES_BLOCK_SIZE,
 600                 .setkey      = ccm4309_aes_nx_set_key,
 601                 .setauthsize = ccm4309_aes_nx_setauthsize,
 602                 .encrypt     = ccm4309_aes_nx_encrypt,
 603                 .decrypt     = ccm4309_aes_nx_decrypt,
 604                 .geniv       = "seqiv",
 605         }
 606 };