| /* |
| * QEMU Cryptodev backend for QEMU cipher APIs |
| * |
| * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. |
| * |
| * Authors: |
| * Gonglei <arei.gonglei@huawei.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "sysemu/cryptodev.h" |
| #include "hw/boards.h" |
| #include "qapi/error.h" |
| #include "standard-headers/linux/virtio_crypto.h" |
| #include "crypto/cipher.h" |
| |
| |
| /** |
| * @TYPE_CRYPTODEV_BACKEND_BUILTIN: |
| * name of backend that uses QEMU cipher API |
| */ |
| #define TYPE_CRYPTODEV_BACKEND_BUILTIN "cryptodev-backend-builtin" |
| |
| #define CRYPTODEV_BACKEND_BUILTIN(obj) \ |
| OBJECT_CHECK(CryptoDevBackendBuiltin, \ |
| (obj), TYPE_CRYPTODEV_BACKEND_BUILTIN) |
| |
| typedef struct CryptoDevBackendBuiltin |
| CryptoDevBackendBuiltin; |
| |
| typedef struct CryptoDevBackendBuiltinSession { |
| QCryptoCipher *cipher; |
| uint8_t direction; /* encryption or decryption */ |
| uint8_t type; /* cipher? hash? aead? */ |
| QTAILQ_ENTRY(CryptoDevBackendBuiltinSession) next; |
| } CryptoDevBackendBuiltinSession; |
| |
| /* Max number of symmetric sessions */ |
| #define MAX_NUM_SESSIONS 256 |
| |
| #define CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN 512 |
| #define CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN 64 |
| |
| struct CryptoDevBackendBuiltin { |
| CryptoDevBackend parent_obj; |
| |
| CryptoDevBackendBuiltinSession *sessions[MAX_NUM_SESSIONS]; |
| }; |
| |
| static void cryptodev_builtin_init( |
| CryptoDevBackend *backend, Error **errp) |
| { |
| /* Only support one queue */ |
| int queues = backend->conf.peers.queues; |
| CryptoDevBackendClient *cc; |
| |
| if (queues != 1) { |
| error_setg(errp, |
| "Only support one queue in cryptdov-builtin backend"); |
| return; |
| } |
| |
| cc = cryptodev_backend_new_client( |
| "cryptodev-builtin", NULL); |
| cc->info_str = g_strdup_printf("cryptodev-builtin0"); |
| cc->queue_index = 0; |
| backend->conf.peers.ccs[0] = cc; |
| |
| backend->conf.crypto_services = |
| 1u << VIRTIO_CRYPTO_SERVICE_CIPHER | |
| 1u << VIRTIO_CRYPTO_SERVICE_HASH | |
| 1u << VIRTIO_CRYPTO_SERVICE_MAC; |
| backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC; |
| backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1; |
| /* |
| * Set the Maximum length of crypto request. |
| * Why this value? Just avoid to overflow when |
| * memory allocation for each crypto request. |
| */ |
| backend->conf.max_size = LONG_MAX - sizeof(CryptoDevBackendSymOpInfo); |
| backend->conf.max_cipher_key_len = CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN; |
| backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN; |
| } |
| |
| static int |
| cryptodev_builtin_get_unused_session_index( |
| CryptoDevBackendBuiltin *builtin) |
| { |
| size_t i; |
| |
| for (i = 0; i < MAX_NUM_SESSIONS; i++) { |
| if (builtin->sessions[i] == NULL) { |
| return i; |
| } |
| } |
| |
| return -1; |
| } |
| |
| static int |
| cryptodev_builtin_get_aes_algo(uint32_t key_len, Error **errp) |
| { |
| int algo; |
| |
| if (key_len == 128 / 8) { |
| algo = QCRYPTO_CIPHER_ALG_AES_128; |
| } else if (key_len == 192 / 8) { |
| algo = QCRYPTO_CIPHER_ALG_AES_192; |
| } else if (key_len == 256 / 8) { |
| algo = QCRYPTO_CIPHER_ALG_AES_256; |
| } else { |
| error_setg(errp, "Unsupported key length :%u", key_len); |
| return -1; |
| } |
| |
| return algo; |
| } |
| |
| static int cryptodev_builtin_create_cipher_session( |
| CryptoDevBackendBuiltin *builtin, |
| CryptoDevBackendSymSessionInfo *sess_info, |
| Error **errp) |
| { |
| int algo; |
| int mode; |
| QCryptoCipher *cipher; |
| int index; |
| CryptoDevBackendBuiltinSession *sess; |
| |
| if (sess_info->op_type != VIRTIO_CRYPTO_SYM_OP_CIPHER) { |
| error_setg(errp, "Unsupported optype :%u", sess_info->op_type); |
| return -1; |
| } |
| |
| index = cryptodev_builtin_get_unused_session_index(builtin); |
| if (index < 0) { |
| error_setg(errp, "Total number of sessions created exceeds %u", |
| MAX_NUM_SESSIONS); |
| return -1; |
| } |
| |
| switch (sess_info->cipher_alg) { |
| case VIRTIO_CRYPTO_CIPHER_AES_ECB: |
| algo = cryptodev_builtin_get_aes_algo(sess_info->key_len, |
| errp); |
| if (algo < 0) { |
| return -1; |
| } |
| mode = QCRYPTO_CIPHER_MODE_ECB; |
| break; |
| case VIRTIO_CRYPTO_CIPHER_AES_CBC: |
| algo = cryptodev_builtin_get_aes_algo(sess_info->key_len, |
| errp); |
| if (algo < 0) { |
| return -1; |
| } |
| mode = QCRYPTO_CIPHER_MODE_CBC; |
| break; |
| case VIRTIO_CRYPTO_CIPHER_AES_CTR: |
| algo = cryptodev_builtin_get_aes_algo(sess_info->key_len, |
| errp); |
| if (algo < 0) { |
| return -1; |
| } |
| mode = QCRYPTO_CIPHER_MODE_CTR; |
| break; |
| case VIRTIO_CRYPTO_CIPHER_DES_ECB: |
| algo = QCRYPTO_CIPHER_ALG_DES_RFB; |
| mode = QCRYPTO_CIPHER_MODE_ECB; |
| break; |
| default: |
| error_setg(errp, "Unsupported cipher alg :%u", |
| sess_info->cipher_alg); |
| return -1; |
| } |
| |
| cipher = qcrypto_cipher_new(algo, mode, |
| sess_info->cipher_key, |
| sess_info->key_len, |
| errp); |
| if (!cipher) { |
| return -1; |
| } |
| |
| sess = g_new0(CryptoDevBackendBuiltinSession, 1); |
| sess->cipher = cipher; |
| sess->direction = sess_info->direction; |
| sess->type = sess_info->op_type; |
| |
| builtin->sessions[index] = sess; |
| |
| return index; |
| } |
| |
| static int64_t cryptodev_builtin_sym_create_session( |
| CryptoDevBackend *backend, |
| CryptoDevBackendSymSessionInfo *sess_info, |
| uint32_t queue_index, Error **errp) |
| { |
| CryptoDevBackendBuiltin *builtin = |
| CRYPTODEV_BACKEND_BUILTIN(backend); |
| int64_t session_id = -1; |
| int ret; |
| |
| switch (sess_info->op_code) { |
| case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION: |
| ret = cryptodev_builtin_create_cipher_session( |
| builtin, sess_info, errp); |
| if (ret < 0) { |
| return ret; |
| } else { |
| session_id = ret; |
| } |
| break; |
| case VIRTIO_CRYPTO_HASH_CREATE_SESSION: |
| case VIRTIO_CRYPTO_MAC_CREATE_SESSION: |
| default: |
| error_setg(errp, "Unsupported opcode :%" PRIu32 "", |
| sess_info->op_code); |
| return -1; |
| } |
| |
| return session_id; |
| } |
| |
| static int cryptodev_builtin_sym_close_session( |
| CryptoDevBackend *backend, |
| uint64_t session_id, |
| uint32_t queue_index, Error **errp) |
| { |
| CryptoDevBackendBuiltin *builtin = |
| CRYPTODEV_BACKEND_BUILTIN(backend); |
| |
| if (session_id >= MAX_NUM_SESSIONS || |
| builtin->sessions[session_id] == NULL) { |
| error_setg(errp, "Cannot find a valid session id: %" PRIu64 "", |
| session_id); |
| return -1; |
| } |
| |
| qcrypto_cipher_free(builtin->sessions[session_id]->cipher); |
| g_free(builtin->sessions[session_id]); |
| builtin->sessions[session_id] = NULL; |
| return 0; |
| } |
| |
| static int cryptodev_builtin_sym_operation( |
| CryptoDevBackend *backend, |
| CryptoDevBackendSymOpInfo *op_info, |
| uint32_t queue_index, Error **errp) |
| { |
| CryptoDevBackendBuiltin *builtin = |
| CRYPTODEV_BACKEND_BUILTIN(backend); |
| CryptoDevBackendBuiltinSession *sess; |
| int ret; |
| |
| if (op_info->session_id >= MAX_NUM_SESSIONS || |
| builtin->sessions[op_info->session_id] == NULL) { |
| error_setg(errp, "Cannot find a valid session id: %" PRIu64 "", |
| op_info->session_id); |
| return -VIRTIO_CRYPTO_INVSESS; |
| } |
| |
| if (op_info->op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) { |
| error_setg(errp, |
| "Algorithm chain is unsupported for cryptdoev-builtin"); |
| return -VIRTIO_CRYPTO_NOTSUPP; |
| } |
| |
| sess = builtin->sessions[op_info->session_id]; |
| |
| ret = qcrypto_cipher_setiv(sess->cipher, op_info->iv, |
| op_info->iv_len, errp); |
| if (ret < 0) { |
| return -VIRTIO_CRYPTO_ERR; |
| } |
| |
| if (sess->direction == VIRTIO_CRYPTO_OP_ENCRYPT) { |
| ret = qcrypto_cipher_encrypt(sess->cipher, op_info->src, |
| op_info->dst, op_info->src_len, errp); |
| if (ret < 0) { |
| return -VIRTIO_CRYPTO_ERR; |
| } |
| } else { |
| ret = qcrypto_cipher_decrypt(sess->cipher, op_info->src, |
| op_info->dst, op_info->src_len, errp); |
| if (ret < 0) { |
| return -VIRTIO_CRYPTO_ERR; |
| } |
| } |
| return VIRTIO_CRYPTO_OK; |
| } |
| |
| static void cryptodev_builtin_cleanup( |
| CryptoDevBackend *backend, |
| Error **errp) |
| { |
| CryptoDevBackendBuiltin *builtin = |
| CRYPTODEV_BACKEND_BUILTIN(backend); |
| size_t i; |
| int queues = backend->conf.peers.queues; |
| CryptoDevBackendClient *cc; |
| |
| for (i = 0; i < MAX_NUM_SESSIONS; i++) { |
| if (builtin->sessions[i] != NULL) { |
| cryptodev_builtin_sym_close_session( |
| backend, i, 0, errp); |
| } |
| } |
| |
| assert(queues == 1); |
| |
| for (i = 0; i < queues; i++) { |
| cc = backend->conf.peers.ccs[i]; |
| if (cc) { |
| cryptodev_backend_free_client(cc); |
| backend->conf.peers.ccs[i] = NULL; |
| } |
| } |
| } |
| |
| static void |
| cryptodev_builtin_class_init(ObjectClass *oc, void *data) |
| { |
| CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc); |
| |
| bc->init = cryptodev_builtin_init; |
| bc->cleanup = cryptodev_builtin_cleanup; |
| bc->create_session = cryptodev_builtin_sym_create_session; |
| bc->close_session = cryptodev_builtin_sym_close_session; |
| bc->do_sym_op = cryptodev_builtin_sym_operation; |
| } |
| |
| static const TypeInfo cryptodev_builtin_info = { |
| .name = TYPE_CRYPTODEV_BACKEND_BUILTIN, |
| .parent = TYPE_CRYPTODEV_BACKEND, |
| .class_init = cryptodev_builtin_class_init, |
| .instance_size = sizeof(CryptoDevBackendBuiltin), |
| }; |
| |
| static void |
| cryptodev_builtin_register_types(void) |
| { |
| type_register_static(&cryptodev_builtin_info); |
| } |
| |
| type_init(cryptodev_builtin_register_types); |