backends/cryptodev-builtin.c

   1 /*
   2  * QEMU Cryptodev backend for QEMU cipher APIs
   3  *
   4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   5  *
   6  * Authors:
   7  *    Gonglei <arei.gonglei@huawei.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  21  *
  22  */
  23
  24 #include "qemu/osdep.h"
  25 #include "sysemu/cryptodev.h"
  26 #include "qapi/error.h"
  27 #include "standard-headers/linux/virtio_crypto.h"
  28 #include "crypto/cipher.h"
  29 #include "crypto/akcipher.h"
  30 #include "qom/object.h"
  31
  32
  33 /**
  34  * @TYPE_CRYPTODEV_BACKEND_BUILTIN:
  35  * name of backend that uses QEMU cipher API
  36  */
  37 #define TYPE_CRYPTODEV_BACKEND_BUILTIN "cryptodev-backend-builtin"
  38
  39 OBJECT_DECLARE_SIMPLE_TYPE(CryptoDevBackendBuiltin, CRYPTODEV_BACKEND_BUILTIN)
  40
  41
  42 typedef struct CryptoDevBackendBuiltinSession {
  43     QCryptoCipher *cipher;
  44     uint8_t direction; /* encryption or decryption */
  45     uint8_t type; /* cipher? hash? aead? */
  46     QCryptoAkCipher *akcipher;
  47     QTAILQ_ENTRY(CryptoDevBackendBuiltinSession) next;
  48 } CryptoDevBackendBuiltinSession;
  49
  50 /* Max number of symmetric/asymmetric sessions */
  51 #define MAX_NUM_SESSIONS 256
  52
  53 #define CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN    512
  54 #define CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN  64
  55
  56 struct CryptoDevBackendBuiltin {
  57     CryptoDevBackend parent_obj;
  58
  59     CryptoDevBackendBuiltinSession *sessions[MAX_NUM_SESSIONS];
  60 };
  61
  62 static void cryptodev_builtin_init_akcipher(CryptoDevBackend *backend)
  63 {
  64     QCryptoAkCipherOptions opts;
  65
  66     opts.alg = QCRYPTO_AKCIPHER_ALG_RSA;
  67     opts.u.rsa.padding_alg = QCRYPTO_RSA_PADDING_ALG_RAW;
  68     if (qcrypto_akcipher_supports(&opts)) {
  69         backend->conf.crypto_services |=
  70                      (1u << QCRYPTODEV_BACKEND_SERVICE_AKCIPHER);
  71         backend->conf.akcipher_algo = 1u << VIRTIO_CRYPTO_AKCIPHER_RSA;
  72     }
  73 }
  74
  75 static void cryptodev_builtin_init(
  76              CryptoDevBackend *backend, Error **errp)
  77 {
  78     /* Only support one queue */
  79     int queues = backend->conf.peers.queues;
  80     CryptoDevBackendClient *cc;
  81
  82     if (queues != 1) {
  83         error_setg(errp,
  84                   "Only support one queue in cryptdov-builtin backend");
  85         return;
  86     }
  87
  88     cc = cryptodev_backend_new_client();
  89     cc->info_str = g_strdup_printf("cryptodev-builtin0");
  90     cc->queue_index = 0;
  91     cc->type = QCRYPTODEV_BACKEND_TYPE_BUILTIN;
  92     backend->conf.peers.ccs[0] = cc;
  93
  94     backend->conf.crypto_services =
  95                          1u << QCRYPTODEV_BACKEND_SERVICE_CIPHER |
  96                          1u << QCRYPTODEV_BACKEND_SERVICE_HASH |
  97                          1u << QCRYPTODEV_BACKEND_SERVICE_MAC;
  98     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
  99     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
 100     /*
 101      * Set the Maximum length of crypto request.
 102      * Why this value? Just avoid to overflow when
 103      * memory allocation for each crypto request.
 104      */
 105     backend->conf.max_size = LONG_MAX - sizeof(CryptoDevBackendOpInfo);
 106     backend->conf.max_cipher_key_len = CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN;
 107     backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN;
 108     cryptodev_builtin_init_akcipher(backend);
 109
 110     cryptodev_backend_set_ready(backend, true);
 111 }
 112
 113 static int
 114 cryptodev_builtin_get_unused_session_index(
 115                  CryptoDevBackendBuiltin *builtin)
 116 {
 117     size_t i;
 118
 119     for (i = 0; i < MAX_NUM_SESSIONS; i++) {
 120         if (builtin->sessions[i] == NULL) {
 121             return i;
 122         }
 123     }
 124
 125     return -1;
 126 }
 127
 128 #define AES_KEYSIZE_128 16
 129 #define AES_KEYSIZE_192 24
 130 #define AES_KEYSIZE_256 32
 131 #define AES_KEYSIZE_128_XTS AES_KEYSIZE_256
 132 #define AES_KEYSIZE_256_XTS 64
 133
 134 static int
 135 cryptodev_builtin_get_aes_algo(uint32_t key_len, int mode, Error **errp)
 136 {
 137     int algo;
 138
 139     if (key_len == AES_KEYSIZE_128) {
 140         algo = QCRYPTO_CIPHER_ALG_AES_128;
 141     } else if (key_len == AES_KEYSIZE_192) {
 142         algo = QCRYPTO_CIPHER_ALG_AES_192;
 143     } else if (key_len == AES_KEYSIZE_256) { /* equals AES_KEYSIZE_128_XTS */
 144         if (mode == QCRYPTO_CIPHER_MODE_XTS) {
 145             algo = QCRYPTO_CIPHER_ALG_AES_128;
 146         } else {
 147             algo = QCRYPTO_CIPHER_ALG_AES_256;
 148         }
 149     } else if (key_len == AES_KEYSIZE_256_XTS) {
 150         if (mode == QCRYPTO_CIPHER_MODE_XTS) {
 151             algo = QCRYPTO_CIPHER_ALG_AES_256;
 152         } else {
 153             goto err;
 154         }
 155     } else {
 156         goto err;
 157     }
 158
 159     return algo;
 160
 161 err:
 162    error_setg(errp, "Unsupported key length :%u", key_len);
 163    return -1;
 164 }
 165
 166 static int cryptodev_builtin_get_rsa_hash_algo(
 167     int virtio_rsa_hash, Error **errp)
 168 {
 169     switch (virtio_rsa_hash) {
 170     case VIRTIO_CRYPTO_RSA_MD5:
 171         return QCRYPTO_HASH_ALG_MD5;
 172
 173     case VIRTIO_CRYPTO_RSA_SHA1:
 174         return QCRYPTO_HASH_ALG_SHA1;
 175
 176     case VIRTIO_CRYPTO_RSA_SHA256:
 177         return QCRYPTO_HASH_ALG_SHA256;
 178
 179     case VIRTIO_CRYPTO_RSA_SHA512:
 180         return QCRYPTO_HASH_ALG_SHA512;
 181
 182     default:
 183         error_setg(errp, "Unsupported rsa hash algo: %d", virtio_rsa_hash);
 184         return -1;
 185     }
 186 }
 187
 188 static int cryptodev_builtin_set_rsa_options(
 189                     int virtio_padding_algo,
 190                     int virtio_hash_algo,
 191                     QCryptoAkCipherOptionsRSA *opt,
 192                     Error **errp)
 193 {
 194     if (virtio_padding_algo == VIRTIO_CRYPTO_RSA_PKCS1_PADDING) {
 195         int hash_alg;
 196
 197         hash_alg = cryptodev_builtin_get_rsa_hash_algo(virtio_hash_algo, errp);
 198         if (hash_alg < 0) {
 199             return -1;
 200         }
 201         opt->hash_alg = hash_alg;
 202         opt->padding_alg = QCRYPTO_RSA_PADDING_ALG_PKCS1;
 203         return 0;
 204     }
 205
 206     if (virtio_padding_algo == VIRTIO_CRYPTO_RSA_RAW_PADDING) {
 207         opt->padding_alg = QCRYPTO_RSA_PADDING_ALG_RAW;
 208         return 0;
 209     }
 210
 211     error_setg(errp, "Unsupported rsa padding algo: %d", virtio_padding_algo);
 212     return -1;
 213 }
 214
 215 static int cryptodev_builtin_create_cipher_session(
 216                     CryptoDevBackendBuiltin *builtin,
 217                     CryptoDevBackendSymSessionInfo *sess_info,
 218                     Error **errp)
 219 {
 220     int algo;
 221     int mode;
 222     QCryptoCipher *cipher;
 223     int index;
 224     CryptoDevBackendBuiltinSession *sess;
 225
 226     if (sess_info->op_type != VIRTIO_CRYPTO_SYM_OP_CIPHER) {
 227         error_setg(errp, "Unsupported optype :%u", sess_info->op_type);
 228         return -1;
 229     }
 230
 231     index = cryptodev_builtin_get_unused_session_index(builtin);
 232     if (index < 0) {
 233         error_setg(errp, "Total number of sessions created exceeds %u",
 234                   MAX_NUM_SESSIONS);
 235         return -1;
 236     }
 237
 238     switch (sess_info->cipher_alg) {
 239     case VIRTIO_CRYPTO_CIPHER_AES_ECB:
 240         mode = QCRYPTO_CIPHER_MODE_ECB;
 241         algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
 242                                                     mode, errp);
 243         if (algo < 0)  {
 244             return -1;
 245         }
 246         break;
 247     case VIRTIO_CRYPTO_CIPHER_AES_CBC:
 248         mode = QCRYPTO_CIPHER_MODE_CBC;
 249         algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
 250                                                     mode, errp);
 251         if (algo < 0)  {
 252             return -1;
 253         }
 254         break;
 255     case VIRTIO_CRYPTO_CIPHER_AES_CTR:
 256         mode = QCRYPTO_CIPHER_MODE_CTR;
 257         algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
 258                                                     mode, errp);
 259         if (algo < 0)  {
 260             return -1;
 261         }
 262         break;
 263     case VIRTIO_CRYPTO_CIPHER_AES_XTS:
 264         mode = QCRYPTO_CIPHER_MODE_XTS;
 265         algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
 266                                                     mode, errp);
 267         if (algo < 0)  {
 268             return -1;
 269         }
 270         break;
 271     case VIRTIO_CRYPTO_CIPHER_3DES_ECB:
 272         mode = QCRYPTO_CIPHER_MODE_ECB;
 273         algo = QCRYPTO_CIPHER_ALG_3DES;
 274         break;
 275     case VIRTIO_CRYPTO_CIPHER_3DES_CBC:
 276         mode = QCRYPTO_CIPHER_MODE_CBC;
 277         algo = QCRYPTO_CIPHER_ALG_3DES;
 278         break;
 279     case VIRTIO_CRYPTO_CIPHER_3DES_CTR:
 280         mode = QCRYPTO_CIPHER_MODE_CTR;
 281         algo = QCRYPTO_CIPHER_ALG_3DES;
 282         break;
 283     default:
 284         error_setg(errp, "Unsupported cipher alg :%u",
 285                    sess_info->cipher_alg);
 286         return -1;
 287     }
 288
 289     cipher = qcrypto_cipher_new(algo, mode,
 290                                sess_info->cipher_key,
 291                                sess_info->key_len,
 292                                errp);
 293     if (!cipher) {
 294         return -1;
 295     }
 296
 297     sess = g_new0(CryptoDevBackendBuiltinSession, 1);
 298     sess->cipher = cipher;
 299     sess->direction = sess_info->direction;
 300     sess->type = sess_info->op_type;
 301
 302     builtin->sessions[index] = sess;
 303
 304     return index;
 305 }
 306
 307 static int cryptodev_builtin_create_akcipher_session(
 308                     CryptoDevBackendBuiltin *builtin,
 309                     CryptoDevBackendAsymSessionInfo *sess_info,
 310                     Error **errp)
 311 {
 312     CryptoDevBackendBuiltinSession *sess;
 313     QCryptoAkCipher *akcipher;
 314     int index;
 315     QCryptoAkCipherKeyType type;
 316     QCryptoAkCipherOptions opts;
 317
 318     switch (sess_info->algo) {
 319     case VIRTIO_CRYPTO_AKCIPHER_RSA:
 320         opts.alg = QCRYPTO_AKCIPHER_ALG_RSA;
 321         if (cryptodev_builtin_set_rsa_options(sess_info->u.rsa.padding_algo,
 322             sess_info->u.rsa.hash_algo, &opts.u.rsa, errp) != 0) {
 323             return -1;
 324         }
 325         break;
 326
 327     /* TODO support DSA&ECDSA until qemu crypto framework support these */
 328
 329     default:
 330         error_setg(errp, "Unsupported akcipher alg %u", sess_info->algo);
 331         return -1;
 332     }
 333
 334     switch (sess_info->keytype) {
 335     case VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
 336         type = QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC;
 337         break;
 338
 339     case VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
 340         type = QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE;
 341         break;
 342
 343     default:
 344         error_setg(errp, "Unsupported akcipher keytype %u", sess_info->keytype);
 345         return -1;
 346     }
 347
 348     index = cryptodev_builtin_get_unused_session_index(builtin);
 349     if (index < 0) {
 350         error_setg(errp, "Total number of sessions created exceeds %u",
 351                    MAX_NUM_SESSIONS);
 352         return -1;
 353     }
 354
 355     akcipher = qcrypto_akcipher_new(&opts, type, sess_info->key,
 356                                     sess_info->keylen, errp);
 357     if (!akcipher) {
 358         return -1;
 359     }
 360
 361     sess = g_new0(CryptoDevBackendBuiltinSession, 1);
 362     sess->akcipher = akcipher;
 363
 364     builtin->sessions[index] = sess;
 365
 366     return index;
 367 }
 368
 369 static int cryptodev_builtin_create_session(
 370            CryptoDevBackend *backend,
 371            CryptoDevBackendSessionInfo *sess_info,
 372            uint32_t queue_index,
 373            CryptoDevCompletionFunc cb,
 374            void *opaque)
 375 {
 376     CryptoDevBackendBuiltin *builtin =
 377                       CRYPTODEV_BACKEND_BUILTIN(backend);
 378     CryptoDevBackendSymSessionInfo *sym_sess_info;
 379     CryptoDevBackendAsymSessionInfo *asym_sess_info;
 380     int ret, status;
 381     Error *local_error = NULL;
 382
 383     switch (sess_info->op_code) {
 384     case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
 385         sym_sess_info = &sess_info->u.sym_sess_info;
 386         ret = cryptodev_builtin_create_cipher_session(
 387                     builtin, sym_sess_info, &local_error);
 388         break;
 389
 390     case VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION:
 391         asym_sess_info = &sess_info->u.asym_sess_info;
 392         ret = cryptodev_builtin_create_akcipher_session(
 393                            builtin, asym_sess_info, &local_error);
 394         break;
 395
 396     case VIRTIO_CRYPTO_HASH_CREATE_SESSION:
 397     case VIRTIO_CRYPTO_MAC_CREATE_SESSION:
 398     default:
 399         error_setg(&local_error, "Unsupported opcode :%" PRIu32 "",
 400                    sess_info->op_code);
 401         return -VIRTIO_CRYPTO_NOTSUPP;
 402     }
 403
 404     if (local_error) {
 405         error_report_err(local_error);
 406     }
 407     if (ret < 0) {
 408         status = -VIRTIO_CRYPTO_ERR;
 409     } else {
 410         sess_info->session_id = ret;
 411         status = VIRTIO_CRYPTO_OK;
 412     }
 413     if (cb) {
 414         cb(opaque, status);
 415     }
 416     return 0;
 417 }
 418
 419 static int cryptodev_builtin_close_session(
 420            CryptoDevBackend *backend,
 421            uint64_t session_id,
 422            uint32_t queue_index,
 423            CryptoDevCompletionFunc cb,
 424            void *opaque)
 425 {
 426     CryptoDevBackendBuiltin *builtin =
 427                       CRYPTODEV_BACKEND_BUILTIN(backend);
 428     CryptoDevBackendBuiltinSession *session;
 429
 430     if (session_id >= MAX_NUM_SESSIONS || !builtin->sessions[session_id]) {
 431         return -VIRTIO_CRYPTO_INVSESS;
 432     }
 433
 434     session = builtin->sessions[session_id];
 435     if (session->cipher) {
 436         qcrypto_cipher_free(session->cipher);
 437     } else if (session->akcipher) {
 438         qcrypto_akcipher_free(session->akcipher);
 439     }
 440
 441     g_free(session);
 442     builtin->sessions[session_id] = NULL;
 443     if (cb) {
 444         cb(opaque, VIRTIO_CRYPTO_OK);
 445     }
 446     return 0;
 447 }
 448
 449 static int cryptodev_builtin_sym_operation(
 450                  CryptoDevBackendBuiltinSession *sess,
 451                  CryptoDevBackendSymOpInfo *op_info, Error **errp)
 452 {
 453     int ret;
 454
 455     if (op_info->op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
 456         error_setg(errp,
 457                "Algorithm chain is unsupported for cryptdoev-builtin");
 458         return -VIRTIO_CRYPTO_NOTSUPP;
 459     }
 460
 461     if (op_info->iv_len > 0) {
 462         ret = qcrypto_cipher_setiv(sess->cipher, op_info->iv,
 463                                    op_info->iv_len, errp);
 464         if (ret < 0) {
 465             return -VIRTIO_CRYPTO_ERR;
 466         }
 467     }
 468
 469     if (sess->direction == VIRTIO_CRYPTO_OP_ENCRYPT) {
 470         ret = qcrypto_cipher_encrypt(sess->cipher, op_info->src,
 471                                      op_info->dst, op_info->src_len, errp);
 472         if (ret < 0) {
 473             return -VIRTIO_CRYPTO_ERR;
 474         }
 475     } else {
 476         ret = qcrypto_cipher_decrypt(sess->cipher, op_info->src,
 477                                      op_info->dst, op_info->src_len, errp);
 478         if (ret < 0) {
 479             return -VIRTIO_CRYPTO_ERR;
 480         }
 481     }
 482
 483     return VIRTIO_CRYPTO_OK;
 484 }
 485
 486 static int cryptodev_builtin_asym_operation(
 487                  CryptoDevBackendBuiltinSession *sess, uint32_t op_code,
 488                  CryptoDevBackendAsymOpInfo *op_info, Error **errp)
 489 {
 490     int ret;
 491
 492     switch (op_code) {
 493     case VIRTIO_CRYPTO_AKCIPHER_ENCRYPT:
 494         ret = qcrypto_akcipher_encrypt(sess->akcipher,
 495                                        op_info->src, op_info->src_len,
 496                                        op_info->dst, op_info->dst_len, errp);
 497         break;
 498
 499     case VIRTIO_CRYPTO_AKCIPHER_DECRYPT:
 500         ret = qcrypto_akcipher_decrypt(sess->akcipher,
 501                                        op_info->src, op_info->src_len,
 502                                        op_info->dst, op_info->dst_len, errp);
 503         break;
 504
 505     case VIRTIO_CRYPTO_AKCIPHER_SIGN:
 506         ret = qcrypto_akcipher_sign(sess->akcipher,
 507                                     op_info->src, op_info->src_len,
 508                                     op_info->dst, op_info->dst_len, errp);
 509         break;
 510
 511     case VIRTIO_CRYPTO_AKCIPHER_VERIFY:
 512         ret = qcrypto_akcipher_verify(sess->akcipher,
 513                                       op_info->src, op_info->src_len,
 514                                       op_info->dst, op_info->dst_len, errp);
 515         break;
 516
 517     default:
 518         return -VIRTIO_CRYPTO_ERR;
 519     }
 520
 521     if (ret < 0) {
 522         if (op_code == VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
 523             return -VIRTIO_CRYPTO_KEY_REJECTED;
 524         }
 525         return -VIRTIO_CRYPTO_ERR;
 526     }
 527
 528     /* Buffer is too short, typically the driver should handle this case */
 529     if (unlikely(ret > op_info->dst_len)) {
 530         if (errp && !*errp) {
 531             error_setg(errp, "dst buffer too short");
 532         }
 533
 534         return -VIRTIO_CRYPTO_ERR;
 535     }
 536
 537     op_info->dst_len = ret;
 538
 539     return VIRTIO_CRYPTO_OK;
 540 }
 541
 542 static int cryptodev_builtin_operation(
 543                  CryptoDevBackend *backend,
 544                  CryptoDevBackendOpInfo *op_info)
 545 {
 546     CryptoDevBackendBuiltin *builtin =
 547                       CRYPTODEV_BACKEND_BUILTIN(backend);
 548     CryptoDevBackendBuiltinSession *sess;
 549     CryptoDevBackendSymOpInfo *sym_op_info;
 550     CryptoDevBackendAsymOpInfo *asym_op_info;
 551     QCryptodevBackendAlgType algtype = op_info->algtype;
 552     int status = -VIRTIO_CRYPTO_ERR;
 553     Error *local_error = NULL;
 554
 555     if (op_info->session_id >= MAX_NUM_SESSIONS ||
 556               builtin->sessions[op_info->session_id] == NULL) {
 557         error_setg(&local_error, "Cannot find a valid session id: %" PRIu64 "",
 558                    op_info->session_id);
 559         return -VIRTIO_CRYPTO_INVSESS;
 560     }
 561
 562     sess = builtin->sessions[op_info->session_id];
 563     if (algtype == QCRYPTODEV_BACKEND_ALG_SYM) {
 564         sym_op_info = op_info->u.sym_op_info;
 565         status = cryptodev_builtin_sym_operation(sess, sym_op_info,
 566                                                  &local_error);
 567     } else if (algtype == QCRYPTODEV_BACKEND_ALG_ASYM) {
 568         asym_op_info = op_info->u.asym_op_info;
 569         status = cryptodev_builtin_asym_operation(sess, op_info->op_code,
 570                                                   asym_op_info, &local_error);
 571     }
 572
 573     if (local_error) {
 574         error_report_err(local_error);
 575     }
 576     if (op_info->cb) {
 577         op_info->cb(op_info->opaque, status);
 578     }
 579     return 0;
 580 }
 581
 582 static void cryptodev_builtin_cleanup(
 583              CryptoDevBackend *backend,
 584              Error **errp)
 585 {
 586     CryptoDevBackendBuiltin *builtin =
 587                       CRYPTODEV_BACKEND_BUILTIN(backend);
 588     size_t i;
 589     int queues = backend->conf.peers.queues;
 590     CryptoDevBackendClient *cc;
 591
 592     for (i = 0; i < MAX_NUM_SESSIONS; i++) {
 593         if (builtin->sessions[i] != NULL) {
 594             cryptodev_builtin_close_session(backend, i, 0, NULL, NULL);
 595         }
 596     }
 597
 598     for (i = 0; i < queues; i++) {
 599         cc = backend->conf.peers.ccs[i];
 600         if (cc) {
 601             cryptodev_backend_free_client(cc);
 602             backend->conf.peers.ccs[i] = NULL;
 603         }
 604     }
 605
 606     cryptodev_backend_set_ready(backend, false);
 607 }
 608
 609 static void
 610 cryptodev_builtin_class_init(ObjectClass *oc, void *data)
 611 {
 612     CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
 613
 614     bc->init = cryptodev_builtin_init;
 615     bc->cleanup = cryptodev_builtin_cleanup;
 616     bc->create_session = cryptodev_builtin_create_session;
 617     bc->close_session = cryptodev_builtin_close_session;
 618     bc->do_op = cryptodev_builtin_operation;
 619 }
 620
 621 static const TypeInfo cryptodev_builtin_info = {
 622     .name = TYPE_CRYPTODEV_BACKEND_BUILTIN,
 623     .parent = TYPE_CRYPTODEV_BACKEND,
 624     .class_init = cryptodev_builtin_class_init,
 625     .instance_size = sizeof(CryptoDevBackendBuiltin),
 626 };
 627
 628 static void
 629 cryptodev_builtin_register_types(void)
 630 {
 631     type_register_static(&cryptodev_builtin_info);
 632 }
 633
 634 type_init(cryptodev_builtin_register_types);