drivers/crypto/virtio/virtio_crypto_skcipher_algs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2  /* Algorithms supported by virtio crypto device
   3   *
   4   * Authors: Gonglei <arei.gonglei@huawei.com>
   5   *
   6   * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
   7   */
   8
   9 #include <crypto/engine.h>
  10 #include <crypto/internal/skcipher.h>
  11 #include <crypto/scatterwalk.h>
  12 #include <linux/err.h>
  13 #include <linux/scatterlist.h>
  14 #include <uapi/linux/virtio_crypto.h>
  15 #include "virtio_crypto_common.h"
  16
  17
  18 struct virtio_crypto_skcipher_ctx {
  19         struct virtio_crypto *vcrypto;
  20         struct crypto_skcipher *tfm;
  21
  22         struct virtio_crypto_sym_session_info enc_sess_info;
  23         struct virtio_crypto_sym_session_info dec_sess_info;
  24 };
  25
  26 struct virtio_crypto_sym_request {
  27         struct virtio_crypto_request base;
  28
  29         /* Cipher or aead */
  30         uint32_t type;
  31         struct virtio_crypto_skcipher_ctx *skcipher_ctx;
  32         struct skcipher_request *skcipher_req;
  33         uint8_t *iv;
  34         /* Encryption? */
  35         bool encrypt;
  36 };
  37
  38 struct virtio_crypto_algo {
  39         uint32_t algonum;
  40         uint32_t service;
  41         unsigned int active_devs;
  42         struct skcipher_engine_alg algo;
  43 };
  44
  45 /*
  46  * The algs_lock protects the below global virtio_crypto_active_devs
  47  * and crypto algorithms registion.
  48  */
  49 static DEFINE_MUTEX(algs_lock);
  50 static void virtio_crypto_skcipher_finalize_req(
  51         struct virtio_crypto_sym_request *vc_sym_req,
  52         struct skcipher_request *req,
  53         int err);
  54
  55 static void virtio_crypto_dataq_sym_callback
  56                 (struct virtio_crypto_request *vc_req, int len)
  57 {
  58         struct virtio_crypto_sym_request *vc_sym_req =
  59                 container_of(vc_req, struct virtio_crypto_sym_request, base);
  60         struct skcipher_request *ablk_req;
  61         int error;
  62
  63         /* Finish the encrypt or decrypt process */
  64         if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
  65                 switch (vc_req->status) {
  66                 case VIRTIO_CRYPTO_OK:
  67                         error = 0;
  68                         break;
  69                 case VIRTIO_CRYPTO_INVSESS:
  70                 case VIRTIO_CRYPTO_ERR:
  71                         error = -EINVAL;
  72                         break;
  73                 case VIRTIO_CRYPTO_BADMSG:
  74                         error = -EBADMSG;
  75                         break;
  76                 default:
  77                         error = -EIO;
  78                         break;
  79                 }
  80                 ablk_req = vc_sym_req->skcipher_req;
  81                 virtio_crypto_skcipher_finalize_req(vc_sym_req,
  82                                                         ablk_req, error);
  83         }
  84 }
  85
  86 static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
  87 {
  88         u64 total = 0;
  89
  90         for (total = 0; sg; sg = sg_next(sg))
  91                 total += sg->length;
  92
  93         return total;
  94 }
  95
  96 static int
  97 virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
  98 {
  99         switch (key_len) {
 100         case AES_KEYSIZE_128:
 101         case AES_KEYSIZE_192:
 102         case AES_KEYSIZE_256:
 103                 *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
 104                 break;
 105         default:
 106                 return -EINVAL;
 107         }
 108         return 0;
 109 }
 110
 111 static int virtio_crypto_alg_skcipher_init_session(
 112                 struct virtio_crypto_skcipher_ctx *ctx,
 113                 uint32_t alg, const uint8_t *key,
 114                 unsigned int keylen,
 115                 int encrypt)
 116 {
 117         struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
 118         struct virtio_crypto *vcrypto = ctx->vcrypto;
 119         int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
 120         int err;
 121         unsigned int num_out = 0, num_in = 0;
 122         struct virtio_crypto_op_ctrl_req *ctrl;
 123         struct virtio_crypto_session_input *input;
 124         struct virtio_crypto_sym_create_session_req *sym_create_session;
 125         struct virtio_crypto_ctrl_request *vc_ctrl_req;
 126
 127         /*
 128          * Avoid to do DMA from the stack, switch to using
 129          * dynamically-allocated for the key
 130          */
 131         uint8_t *cipher_key = kmemdup(key, keylen, GFP_ATOMIC);
 132
 133         if (!cipher_key)
 134                 return -ENOMEM;
 135
 136         vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
 137         if (!vc_ctrl_req) {
 138                 err = -ENOMEM;
 139                 goto out;
 140         }
 141
 142         /* Pad ctrl header */
 143         ctrl = &vc_ctrl_req->ctrl;
 144         ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
 145         ctrl->header.algo = cpu_to_le32(alg);
 146         /* Set the default dataqueue id to 0 */
 147         ctrl->header.queue_id = 0;
 148
 149         input = &vc_ctrl_req->input;
 150         input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 151         /* Pad cipher's parameters */
 152         sym_create_session = &ctrl->u.sym_create_session;
 153         sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
 154         sym_create_session->u.cipher.para.algo = ctrl->header.algo;
 155         sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
 156         sym_create_session->u.cipher.para.op = cpu_to_le32(op);
 157
 158         sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
 159         sgs[num_out++] = &outhdr;
 160
 161         /* Set key */
 162         sg_init_one(&key_sg, cipher_key, keylen);
 163         sgs[num_out++] = &key_sg;
 164
 165         /* Return status and session id back */
 166         sg_init_one(&inhdr, input, sizeof(*input));
 167         sgs[num_out + num_in++] = &inhdr;
 168
 169         err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
 170         if (err < 0)
 171                 goto out;
 172
 173         if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 174                 pr_err("virtio_crypto: Create session failed status: %u\n",
 175                         le32_to_cpu(input->status));
 176                 err = -EINVAL;
 177                 goto out;
 178         }
 179
 180         if (encrypt)
 181                 ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
 182         else
 183                 ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
 184
 185         err = 0;
 186 out:
 187         kfree(vc_ctrl_req);
 188         kfree_sensitive(cipher_key);
 189         return err;
 190 }
 191
 192 static int virtio_crypto_alg_skcipher_close_session(
 193                 struct virtio_crypto_skcipher_ctx *ctx,
 194                 int encrypt)
 195 {
 196         struct scatterlist outhdr, status_sg, *sgs[2];
 197         struct virtio_crypto_destroy_session_req *destroy_session;
 198         struct virtio_crypto *vcrypto = ctx->vcrypto;
 199         int err;
 200         unsigned int num_out = 0, num_in = 0;
 201         struct virtio_crypto_op_ctrl_req *ctrl;
 202         struct virtio_crypto_inhdr *ctrl_status;
 203         struct virtio_crypto_ctrl_request *vc_ctrl_req;
 204
 205         vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
 206         if (!vc_ctrl_req)
 207                 return -ENOMEM;
 208
 209         ctrl_status = &vc_ctrl_req->ctrl_status;
 210         ctrl_status->status = VIRTIO_CRYPTO_ERR;
 211         /* Pad ctrl header */
 212         ctrl = &vc_ctrl_req->ctrl;
 213         ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
 214         /* Set the default virtqueue id to 0 */
 215         ctrl->header.queue_id = 0;
 216
 217         destroy_session = &ctrl->u.destroy_session;
 218
 219         if (encrypt)
 220                 destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id);
 221         else
 222                 destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id);
 223
 224         sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
 225         sgs[num_out++] = &outhdr;
 226
 227         /* Return status and session id back */
 228         sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status));
 229         sgs[num_out + num_in++] = &status_sg;
 230
 231         err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
 232         if (err < 0)
 233                 goto out;
 234
 235         if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 236                 pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
 237                         ctrl_status->status, destroy_session->session_id);
 238
 239                 err = -EINVAL;
 240                 goto out;
 241         }
 242
 243         err = 0;
 244 out:
 245         kfree(vc_ctrl_req);
 246         return err;
 247 }
 248
 249 static int virtio_crypto_alg_skcipher_init_sessions(
 250                 struct virtio_crypto_skcipher_ctx *ctx,
 251                 const uint8_t *key, unsigned int keylen)
 252 {
 253         uint32_t alg;
 254         int ret;
 255         struct virtio_crypto *vcrypto = ctx->vcrypto;
 256
 257         if (keylen > vcrypto->max_cipher_key_len) {
 258                 pr_err("virtio_crypto: the key is too long\n");
 259                 return -EINVAL;
 260         }
 261
 262         if (virtio_crypto_alg_validate_key(keylen, &alg))
 263                 return -EINVAL;
 264
 265         /* Create encryption session */
 266         ret = virtio_crypto_alg_skcipher_init_session(ctx,
 267                         alg, key, keylen, 1);
 268         if (ret)
 269                 return ret;
 270         /* Create decryption session */
 271         ret = virtio_crypto_alg_skcipher_init_session(ctx,
 272                         alg, key, keylen, 0);
 273         if (ret) {
 274                 virtio_crypto_alg_skcipher_close_session(ctx, 1);
 275                 return ret;
 276         }
 277         return 0;
 278 }
 279
 280 /* Note: kernel crypto API realization */
 281 static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
 282                                          const uint8_t *key,
 283                                          unsigned int keylen)
 284 {
 285         struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 286         uint32_t alg;
 287         int ret;
 288
 289         ret = virtio_crypto_alg_validate_key(keylen, &alg);
 290         if (ret)
 291                 return ret;
 292
 293         if (!ctx->vcrypto) {
 294                 /* New key */
 295                 int node = virtio_crypto_get_current_node();
 296                 struct virtio_crypto *vcrypto =
 297                                       virtcrypto_get_dev_node(node,
 298                                       VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
 299                 if (!vcrypto) {
 300                         pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
 301                         return -ENODEV;
 302                 }
 303
 304                 ctx->vcrypto = vcrypto;
 305         } else {
 306                 /* Rekeying, we should close the created sessions previously */
 307                 virtio_crypto_alg_skcipher_close_session(ctx, 1);
 308                 virtio_crypto_alg_skcipher_close_session(ctx, 0);
 309         }
 310
 311         ret = virtio_crypto_alg_skcipher_init_sessions(ctx, key, keylen);
 312         if (ret) {
 313                 virtcrypto_dev_put(ctx->vcrypto);
 314                 ctx->vcrypto = NULL;
 315
 316                 return ret;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int
 323 __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 324                 struct skcipher_request *req,
 325                 struct data_queue *data_vq)
 326 {
 327         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 328         struct virtio_crypto_skcipher_ctx *ctx = vc_sym_req->skcipher_ctx;
 329         struct virtio_crypto_request *vc_req = &vc_sym_req->base;
 330         unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 331         struct virtio_crypto *vcrypto = ctx->vcrypto;
 332         struct virtio_crypto_op_data_req *req_data;
 333         int src_nents, dst_nents;
 334         int err;
 335         unsigned long flags;
 336         struct scatterlist outhdr, iv_sg, status_sg, **sgs;
 337         u64 dst_len;
 338         unsigned int num_out = 0, num_in = 0;
 339         int sg_total;
 340         uint8_t *iv;
 341         struct scatterlist *sg;
 342
 343         src_nents = sg_nents_for_len(req->src, req->cryptlen);
 344         if (src_nents < 0) {
 345                 pr_err("Invalid number of src SG.\n");
 346                 return src_nents;
 347         }
 348
 349         dst_nents = sg_nents(req->dst);
 350
 351         pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n",
 352                         src_nents, dst_nents);
 353
 354         /* Why 3?  outhdr + iv + inhdr */
 355         sg_total = src_nents + dst_nents + 3;
 356         sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
 357                                 dev_to_node(&vcrypto->vdev->dev));
 358         if (!sgs)
 359                 return -ENOMEM;
 360
 361         req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
 362                                 dev_to_node(&vcrypto->vdev->dev));
 363         if (!req_data) {
 364                 kfree(sgs);
 365                 return -ENOMEM;
 366         }
 367
 368         vc_req->req_data = req_data;
 369         vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
 370         /* Head of operation */
 371         if (vc_sym_req->encrypt) {
 372                 req_data->header.session_id =
 373                         cpu_to_le64(ctx->enc_sess_info.session_id);
 374                 req_data->header.opcode =
 375                         cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
 376         } else {
 377                 req_data->header.session_id =
 378                         cpu_to_le64(ctx->dec_sess_info.session_id);
 379                 req_data->header.opcode =
 380                         cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
 381         }
 382         req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
 383         req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
 384         req_data->u.sym_req.u.cipher.para.src_data_len =
 385                         cpu_to_le32(req->cryptlen);
 386
 387         dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
 388         if (unlikely(dst_len > U32_MAX)) {
 389                 pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
 390                 err = -EINVAL;
 391                 goto free;
 392         }
 393
 394         dst_len = min_t(unsigned int, req->cryptlen, dst_len);
 395         pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
 396                         req->cryptlen, dst_len);
 397
 398         if (unlikely(req->cryptlen + dst_len + ivsize +
 399                 sizeof(vc_req->status) > vcrypto->max_size)) {
 400                 pr_err("virtio_crypto: The length is too big\n");
 401                 err = -EINVAL;
 402                 goto free;
 403         }
 404
 405         req_data->u.sym_req.u.cipher.para.dst_data_len =
 406                         cpu_to_le32((uint32_t)dst_len);
 407
 408         /* Outhdr */
 409         sg_init_one(&outhdr, req_data, sizeof(*req_data));
 410         sgs[num_out++] = &outhdr;
 411
 412         /* IV */
 413
 414         /*
 415          * Avoid to do DMA from the stack, switch to using
 416          * dynamically-allocated for the IV
 417          */
 418         iv = kzalloc_node(ivsize, GFP_ATOMIC,
 419                                 dev_to_node(&vcrypto->vdev->dev));
 420         if (!iv) {
 421                 err = -ENOMEM;
 422                 goto free;
 423         }
 424         memcpy(iv, req->iv, ivsize);
 425         if (!vc_sym_req->encrypt)
 426                 scatterwalk_map_and_copy(req->iv, req->src,
 427                                          req->cryptlen - AES_BLOCK_SIZE,
 428                                          AES_BLOCK_SIZE, 0);
 429
 430         sg_init_one(&iv_sg, iv, ivsize);
 431         sgs[num_out++] = &iv_sg;
 432         vc_sym_req->iv = iv;
 433
 434         /* Source data */
 435         for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
 436                 sgs[num_out++] = sg;
 437
 438         /* Destination data */
 439         for (sg = req->dst; sg; sg = sg_next(sg))
 440                 sgs[num_out + num_in++] = sg;
 441
 442         /* Status */
 443         sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
 444         sgs[num_out + num_in++] = &status_sg;
 445
 446         vc_req->sgs = sgs;
 447
 448         spin_lock_irqsave(&data_vq->lock, flags);
 449         err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
 450                                 num_in, vc_req, GFP_ATOMIC);
 451         virtqueue_kick(data_vq->vq);
 452         spin_unlock_irqrestore(&data_vq->lock, flags);
 453         if (unlikely(err < 0))
 454                 goto free_iv;
 455
 456         return 0;
 457
 458 free_iv:
 459         kfree_sensitive(iv);
 460 free:
 461         kfree_sensitive(req_data);
 462         kfree(sgs);
 463         return err;
 464 }
 465
 466 static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
 467 {
 468         struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
 469         struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
 470         struct virtio_crypto_sym_request *vc_sym_req =
 471                                 skcipher_request_ctx(req);
 472         struct virtio_crypto_request *vc_req = &vc_sym_req->base;
 473         struct virtio_crypto *vcrypto = ctx->vcrypto;
 474         /* Use the first data virtqueue as default */
 475         struct data_queue *data_vq = &vcrypto->data_vq[0];
 476
 477         if (!req->cryptlen)
 478                 return 0;
 479         if (req->cryptlen % AES_BLOCK_SIZE)
 480                 return -EINVAL;
 481
 482         vc_req->dataq = data_vq;
 483         vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
 484         vc_sym_req->skcipher_ctx = ctx;
 485         vc_sym_req->skcipher_req = req;
 486         vc_sym_req->encrypt = true;
 487
 488         return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
 489 }
 490
 491 static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
 492 {
 493         struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
 494         struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
 495         struct virtio_crypto_sym_request *vc_sym_req =
 496                                 skcipher_request_ctx(req);
 497         struct virtio_crypto_request *vc_req = &vc_sym_req->base;
 498         struct virtio_crypto *vcrypto = ctx->vcrypto;
 499         /* Use the first data virtqueue as default */
 500         struct data_queue *data_vq = &vcrypto->data_vq[0];
 501
 502         if (!req->cryptlen)
 503                 return 0;
 504         if (req->cryptlen % AES_BLOCK_SIZE)
 505                 return -EINVAL;
 506
 507         vc_req->dataq = data_vq;
 508         vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
 509         vc_sym_req->skcipher_ctx = ctx;
 510         vc_sym_req->skcipher_req = req;
 511         vc_sym_req->encrypt = false;
 512
 513         return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req);
 514 }
 515
 516 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
 517 {
 518         struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 519
 520         crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
 521         ctx->tfm = tfm;
 522
 523         return 0;
 524 }
 525
 526 static void virtio_crypto_skcipher_exit(struct crypto_skcipher *tfm)
 527 {
 528         struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 529
 530         if (!ctx->vcrypto)
 531                 return;
 532
 533         virtio_crypto_alg_skcipher_close_session(ctx, 1);
 534         virtio_crypto_alg_skcipher_close_session(ctx, 0);
 535         virtcrypto_dev_put(ctx->vcrypto);
 536         ctx->vcrypto = NULL;
 537 }
 538
 539 int virtio_crypto_skcipher_crypt_req(
 540         struct crypto_engine *engine, void *vreq)
 541 {
 542         struct skcipher_request *req = container_of(vreq, struct skcipher_request, base);
 543         struct virtio_crypto_sym_request *vc_sym_req =
 544                                 skcipher_request_ctx(req);
 545         struct virtio_crypto_request *vc_req = &vc_sym_req->base;
 546         struct data_queue *data_vq = vc_req->dataq;
 547         int ret;
 548
 549         ret = __virtio_crypto_skcipher_do_req(vc_sym_req, req, data_vq);
 550         if (ret < 0)
 551                 return ret;
 552
 553         virtqueue_kick(data_vq->vq);
 554
 555         return 0;
 556 }
 557
 558 static void virtio_crypto_skcipher_finalize_req(
 559         struct virtio_crypto_sym_request *vc_sym_req,
 560         struct skcipher_request *req,
 561         int err)
 562 {
 563         if (vc_sym_req->encrypt)
 564                 scatterwalk_map_and_copy(req->iv, req->dst,
 565                                          req->cryptlen - AES_BLOCK_SIZE,
 566                                          AES_BLOCK_SIZE, 0);
 567         kfree_sensitive(vc_sym_req->iv);
 568         virtcrypto_clear_request(&vc_sym_req->base);
 569
 570         crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine,
 571                                            req, err);
 572 }
 573
 574 static struct virtio_crypto_algo virtio_crypto_algs[] = { {
 575         .algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
 576         .service = VIRTIO_CRYPTO_SERVICE_CIPHER,
 577         .algo.base = {
 578                 .base.cra_name          = "cbc(aes)",
 579                 .base.cra_driver_name   = "virtio_crypto_aes_cbc",
 580                 .base.cra_priority      = 150,
 581                 .base.cra_flags         = CRYPTO_ALG_ASYNC |
 582                                           CRYPTO_ALG_ALLOCATES_MEMORY,
 583                 .base.cra_blocksize     = AES_BLOCK_SIZE,
 584                 .base.cra_ctxsize       = sizeof(struct virtio_crypto_skcipher_ctx),
 585                 .base.cra_module        = THIS_MODULE,
 586                 .init                   = virtio_crypto_skcipher_init,
 587                 .exit                   = virtio_crypto_skcipher_exit,
 588                 .setkey                 = virtio_crypto_skcipher_setkey,
 589                 .decrypt                = virtio_crypto_skcipher_decrypt,
 590                 .encrypt                = virtio_crypto_skcipher_encrypt,
 591                 .min_keysize            = AES_MIN_KEY_SIZE,
 592                 .max_keysize            = AES_MAX_KEY_SIZE,
 593                 .ivsize                 = AES_BLOCK_SIZE,
 594         },
 595         .algo.op = {
 596                 .do_one_request = virtio_crypto_skcipher_crypt_req,
 597         },
 598 } };
 599
 600 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto)
 601 {
 602         int ret = 0;
 603         int i = 0;
 604
 605         mutex_lock(&algs_lock);
 606
 607         for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
 608
 609                 uint32_t service = virtio_crypto_algs[i].service;
 610                 uint32_t algonum = virtio_crypto_algs[i].algonum;
 611
 612                 if (!virtcrypto_algo_is_supported(vcrypto, service, algonum))
 613                         continue;
 614
 615                 if (virtio_crypto_algs[i].active_devs == 0) {
 616                         ret = crypto_engine_register_skcipher(&virtio_crypto_algs[i].algo);
 617                         if (ret)
 618                                 goto unlock;
 619                 }
 620
 621                 virtio_crypto_algs[i].active_devs++;
 622                 dev_info(&vcrypto->vdev->dev, "Registered algo %s\n",
 623                          virtio_crypto_algs[i].algo.base.base.cra_name);
 624         }
 625
 626 unlock:
 627         mutex_unlock(&algs_lock);
 628         return ret;
 629 }
 630
 631 void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto)
 632 {
 633         int i = 0;
 634
 635         mutex_lock(&algs_lock);
 636
 637         for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) {
 638
 639                 uint32_t service = virtio_crypto_algs[i].service;
 640                 uint32_t algonum = virtio_crypto_algs[i].algonum;
 641
 642                 if (virtio_crypto_algs[i].active_devs == 0 ||
 643                     !virtcrypto_algo_is_supported(vcrypto, service, algonum))
 644                         continue;
 645
 646                 if (virtio_crypto_algs[i].active_devs == 1)
 647                         crypto_engine_unregister_skcipher(&virtio_crypto_algs[i].algo);
 648
 649                 virtio_crypto_algs[i].active_devs--;
 650         }
 651
 652         mutex_unlock(&algs_lock);
 653 }