cryptodev: introduce a new cryptodev backend

The new cryptodev backend named cryptodev-builtin,
which realized by QEMU cipher APIs. These APIs can
be backed by either nettle or gcrypt.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 362 insertions, 0 deletions

diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index 55bd43d111..18469980e6 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -11,3 +11,4 @@ common-obj-y += hostmem.o hostmem-ram.o
 common-obj-$(CONFIG_LINUX) += hostmem-file.o
 
 common-obj-y += cryptodev.o
+common-obj-y += cryptodev-builtin.o
diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c
new file mode 100644
index 0000000000..eda954b2a2
--- /dev/null
+++ b/backends/cryptodev-builtin.c
@@ -0,0 +1,361 @@
+/*
+ * 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);