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linux/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
Linus Torvalds c8e7699616 This update includes the following changes:
API:
 
 - Avoid unnecessary copying in scomp for trivial SG lists.
 
 Algorithms:
 
 - Optimise NEON CCM implementation on ARM64.
 
 Drivers:
 
 - Add queue stop/query debugfs support in hisilicon/qm.
 -
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Merge tag 'v6.9-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Pull crypto updates from Herbert Xu:
 "API:

   - Avoid unnecessary copying in scomp for trivial SG lists

  Algorithms:

   - Optimise NEON CCM implementation on ARM64

  Drivers:

   - Add queue stop/query debugfs support in hisilicon/qm

   - Intel qat updates and cleanups"

* tag 'v6.9-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (79 commits)
  Revert "crypto: remove CONFIG_CRYPTO_STATS"
  crypto: scomp - remove memcpy if sg_nents is 1 and pages are lowmem
  crypto: tcrypt - add ffdhe2048(dh) test
  crypto: iaa - fix the missing CRYPTO_ALG_ASYNC in cra_flags
  crypto: hisilicon/zip - fix the missing CRYPTO_ALG_ASYNC in cra_flags
  hwrng: hisi - use dev_err_probe
  MAINTAINERS: Remove T Ambarus from few mchp entries
  crypto: iaa - Fix comp/decomp delay statistics
  crypto: iaa - Fix async_disable descriptor leak
  dt-bindings: rng: atmel,at91-trng: add sam9x7 TRNG
  dt-bindings: crypto: add sam9x7 in Atmel TDES
  dt-bindings: crypto: add sam9x7 in Atmel SHA
  dt-bindings: crypto: add sam9x7 in Atmel AES
  crypto: remove CONFIG_CRYPTO_STATS
  crypto: dh - Make public key test FIPS-only
  crypto: rockchip - fix to check return value
  crypto: jitter - fix CRYPTO_JITTERENTROPY help text
  crypto: qat - make ring to service map common for QAT GEN4
  crypto: qat - fix ring to service map for dcc in 420xx
  crypto: qat - fix ring to service map for dcc in 4xxx
  ...
2024-03-15 14:46:54 -07:00

600 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/* Asymmetric algorithms supported by virtio crypto device
*
* Authors: zhenwei pi <pizhenwei@bytedance.com>
* lei he <helei.sig11@bytedance.com>
*
* Copyright 2022 Bytedance CO., LTD.
*/
#include <crypto/engine.h>
#include <crypto/internal/akcipher.h>
#include <crypto/internal/rsa.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/mpi.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <uapi/linux/virtio_crypto.h>
#include "virtio_crypto_common.h"
struct virtio_crypto_rsa_ctx {
MPI n;
};
struct virtio_crypto_akcipher_ctx {
struct virtio_crypto *vcrypto;
struct crypto_akcipher *tfm;
bool session_valid;
__u64 session_id;
union {
struct virtio_crypto_rsa_ctx rsa_ctx;
};
};
struct virtio_crypto_akcipher_request {
struct virtio_crypto_request base;
struct virtio_crypto_akcipher_ctx *akcipher_ctx;
struct akcipher_request *akcipher_req;
void *src_buf;
void *dst_buf;
uint32_t opcode;
};
struct virtio_crypto_akcipher_algo {
uint32_t algonum;
uint32_t service;
unsigned int active_devs;
struct akcipher_engine_alg algo;
};
static DEFINE_MUTEX(algs_lock);
static void virtio_crypto_akcipher_finalize_req(
struct virtio_crypto_akcipher_request *vc_akcipher_req,
struct akcipher_request *req, int err)
{
kfree(vc_akcipher_req->src_buf);
kfree(vc_akcipher_req->dst_buf);
vc_akcipher_req->src_buf = NULL;
vc_akcipher_req->dst_buf = NULL;
virtcrypto_clear_request(&vc_akcipher_req->base);
crypto_finalize_akcipher_request(vc_akcipher_req->base.dataq->engine, req, err);
}
static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request *vc_req, int len)
{
struct virtio_crypto_akcipher_request *vc_akcipher_req =
container_of(vc_req, struct virtio_crypto_akcipher_request, base);
struct akcipher_request *akcipher_req;
int error;
switch (vc_req->status) {
case VIRTIO_CRYPTO_OK:
error = 0;
break;
case VIRTIO_CRYPTO_INVSESS:
case VIRTIO_CRYPTO_ERR:
error = -EINVAL;
break;
case VIRTIO_CRYPTO_BADMSG:
error = -EBADMSG;
break;
case VIRTIO_CRYPTO_KEY_REJECTED:
error = -EKEYREJECTED;
break;
default:
error = -EIO;
break;
}
akcipher_req = vc_akcipher_req->akcipher_req;
if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
/* actuall length maybe less than dst buffer */
akcipher_req->dst_len = len - sizeof(vc_req->status);
sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst),
vc_akcipher_req->dst_buf, akcipher_req->dst_len);
}
virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error);
}
static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher_ctx *ctx,
struct virtio_crypto_ctrl_header *header,
struct virtio_crypto_akcipher_session_para *para,
const uint8_t *key, unsigned int keylen)
{
struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3];
struct virtio_crypto *vcrypto = ctx->vcrypto;
uint8_t *pkey;
int err;
unsigned int num_out = 0, num_in = 0;
struct virtio_crypto_op_ctrl_req *ctrl;
struct virtio_crypto_session_input *input;
struct virtio_crypto_ctrl_request *vc_ctrl_req;
pkey = kmemdup(key, keylen, GFP_KERNEL);
if (!pkey)
return -ENOMEM;
vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
if (!vc_ctrl_req) {
err = -ENOMEM;
goto out;
}
ctrl = &vc_ctrl_req->ctrl;
memcpy(&ctrl->header, header, sizeof(ctrl->header));
memcpy(&ctrl->u.akcipher_create_session.para, para, sizeof(*para));
input = &vc_ctrl_req->input;
input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
sgs[num_out++] = &outhdr_sg;
sg_init_one(&key_sg, pkey, keylen);
sgs[num_out++] = &key_sg;
sg_init_one(&inhdr_sg, input, sizeof(*input));
sgs[num_out + num_in++] = &inhdr_sg;
err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
if (err < 0)
goto out;
if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Create session failed status: %u\n",
le32_to_cpu(input->status));
err = -EINVAL;
goto out;
}
ctx->session_id = le64_to_cpu(input->session_id);
ctx->session_valid = true;
err = 0;
out:
kfree(vc_ctrl_req);
kfree_sensitive(pkey);
return err;
}
static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akcipher_ctx *ctx)
{
struct scatterlist outhdr_sg, inhdr_sg, *sgs[2];
struct virtio_crypto_destroy_session_req *destroy_session;
struct virtio_crypto *vcrypto = ctx->vcrypto;
unsigned int num_out = 0, num_in = 0;
int err;
struct virtio_crypto_op_ctrl_req *ctrl;
struct virtio_crypto_inhdr *ctrl_status;
struct virtio_crypto_ctrl_request *vc_ctrl_req;
if (!ctx->session_valid)
return 0;
vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
if (!vc_ctrl_req)
return -ENOMEM;
ctrl_status = &vc_ctrl_req->ctrl_status;
ctrl_status->status = VIRTIO_CRYPTO_ERR;
ctrl = &vc_ctrl_req->ctrl;
ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
ctrl->header.queue_id = 0;
destroy_session = &ctrl->u.destroy_session;
destroy_session->session_id = cpu_to_le64(ctx->session_id);
sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
sgs[num_out++] = &outhdr_sg;
sg_init_one(&inhdr_sg, &ctrl_status->status, sizeof(ctrl_status->status));
sgs[num_out + num_in++] = &inhdr_sg;
err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
if (err < 0)
goto out;
if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
ctrl_status->status, destroy_session->session_id);
err = -EINVAL;
goto out;
}
err = 0;
ctx->session_valid = false;
out:
kfree(vc_ctrl_req);
return err;
}
static int __virtio_crypto_akcipher_do_req(struct virtio_crypto_akcipher_request *vc_akcipher_req,
struct akcipher_request *req, struct data_queue *data_vq)
{
struct virtio_crypto_akcipher_ctx *ctx = vc_akcipher_req->akcipher_ctx;
struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
struct virtio_crypto *vcrypto = ctx->vcrypto;
struct virtio_crypto_op_data_req *req_data = vc_req->req_data;
struct scatterlist *sgs[4], outhdr_sg, inhdr_sg, srcdata_sg, dstdata_sg;
void *src_buf, *dst_buf = NULL;
unsigned int num_out = 0, num_in = 0;
int node = dev_to_node(&vcrypto->vdev->dev);
unsigned long flags;
int ret;
bool verify = vc_akcipher_req->opcode == VIRTIO_CRYPTO_AKCIPHER_VERIFY;
unsigned int src_len = verify ? req->src_len + req->dst_len : req->src_len;
/* out header */
sg_init_one(&outhdr_sg, req_data, sizeof(*req_data));
sgs[num_out++] = &outhdr_sg;
/* src data */
src_buf = kcalloc_node(src_len, 1, GFP_KERNEL, node);
if (!src_buf)
return -ENOMEM;
if (verify) {
/* for verify operation, both src and dst data work as OUT direction */
sg_copy_to_buffer(req->src, sg_nents(req->src), src_buf, src_len);
sg_init_one(&srcdata_sg, src_buf, src_len);
sgs[num_out++] = &srcdata_sg;
} else {
sg_copy_to_buffer(req->src, sg_nents(req->src), src_buf, src_len);
sg_init_one(&srcdata_sg, src_buf, src_len);
sgs[num_out++] = &srcdata_sg;
/* dst data */
dst_buf = kcalloc_node(req->dst_len, 1, GFP_KERNEL, node);
if (!dst_buf)
goto free_src;
sg_init_one(&dstdata_sg, dst_buf, req->dst_len);
sgs[num_out + num_in++] = &dstdata_sg;
}
vc_akcipher_req->src_buf = src_buf;
vc_akcipher_req->dst_buf = dst_buf;
/* in header */
sg_init_one(&inhdr_sg, &vc_req->status, sizeof(vc_req->status));
sgs[num_out + num_in++] = &inhdr_sg;
spin_lock_irqsave(&data_vq->lock, flags);
ret = virtqueue_add_sgs(data_vq->vq, sgs, num_out, num_in, vc_req, GFP_ATOMIC);
virtqueue_kick(data_vq->vq);
spin_unlock_irqrestore(&data_vq->lock, flags);
if (ret)
goto err;
return 0;
err:
kfree(dst_buf);
free_src:
kfree(src_buf);
return -ENOMEM;
}
static int virtio_crypto_rsa_do_req(struct crypto_engine *engine, void *vreq)
{
struct akcipher_request *req = container_of(vreq, struct akcipher_request, base);
struct virtio_crypto_akcipher_request *vc_akcipher_req = akcipher_request_ctx(req);
struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
struct virtio_crypto_akcipher_ctx *ctx = vc_akcipher_req->akcipher_ctx;
struct virtio_crypto *vcrypto = ctx->vcrypto;
struct data_queue *data_vq = vc_req->dataq;
struct virtio_crypto_op_header *header;
struct virtio_crypto_akcipher_data_req *akcipher_req;
int ret;
vc_req->sgs = NULL;
vc_req->req_data = kzalloc_node(sizeof(*vc_req->req_data),
GFP_KERNEL, dev_to_node(&vcrypto->vdev->dev));
if (!vc_req->req_data)
return -ENOMEM;
/* build request header */
header = &vc_req->req_data->header;
header->opcode = cpu_to_le32(vc_akcipher_req->opcode);
header->algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
header->session_id = cpu_to_le64(ctx->session_id);
/* build request akcipher data */
akcipher_req = &vc_req->req_data->u.akcipher_req;
akcipher_req->para.src_data_len = cpu_to_le32(req->src_len);
akcipher_req->para.dst_data_len = cpu_to_le32(req->dst_len);
ret = __virtio_crypto_akcipher_do_req(vc_akcipher_req, req, data_vq);
if (ret < 0) {
kfree_sensitive(vc_req->req_data);
vc_req->req_data = NULL;
return ret;
}
return 0;
}
static int virtio_crypto_rsa_req(struct akcipher_request *req, uint32_t opcode)
{
struct crypto_akcipher *atfm = crypto_akcipher_reqtfm(req);
struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(atfm);
struct virtio_crypto_akcipher_request *vc_akcipher_req = akcipher_request_ctx(req);
struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
struct virtio_crypto *vcrypto = ctx->vcrypto;
/* Use the first data virtqueue as default */
struct data_queue *data_vq = &vcrypto->data_vq[0];
vc_req->dataq = data_vq;
vc_req->alg_cb = virtio_crypto_dataq_akcipher_callback;
vc_akcipher_req->akcipher_ctx = ctx;
vc_akcipher_req->akcipher_req = req;
vc_akcipher_req->opcode = opcode;
return crypto_transfer_akcipher_request_to_engine(data_vq->engine, req);
}
static int virtio_crypto_rsa_encrypt(struct akcipher_request *req)
{
return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_ENCRYPT);
}
static int virtio_crypto_rsa_decrypt(struct akcipher_request *req)
{
return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_DECRYPT);
}
static int virtio_crypto_rsa_sign(struct akcipher_request *req)
{
return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_SIGN);
}
static int virtio_crypto_rsa_verify(struct akcipher_request *req)
{
return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_VERIFY);
}
static int virtio_crypto_rsa_set_key(struct crypto_akcipher *tfm,
const void *key,
unsigned int keylen,
bool private,
int padding_algo,
int hash_algo)
{
struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
struct virtio_crypto *vcrypto;
struct virtio_crypto_ctrl_header header;
struct virtio_crypto_akcipher_session_para para;
struct rsa_key rsa_key = {0};
int node = virtio_crypto_get_current_node();
uint32_t keytype;
int ret;
/* mpi_free will test n, just free it. */
mpi_free(rsa_ctx->n);
rsa_ctx->n = NULL;
if (private) {
keytype = VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PRIVATE;
ret = rsa_parse_priv_key(&rsa_key, key, keylen);
} else {
keytype = VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PUBLIC;
ret = rsa_parse_pub_key(&rsa_key, key, keylen);
}
if (ret)
return ret;
rsa_ctx->n = mpi_read_raw_data(rsa_key.n, rsa_key.n_sz);
if (!rsa_ctx->n)
return -ENOMEM;
if (!ctx->vcrypto) {
vcrypto = virtcrypto_get_dev_node(node, VIRTIO_CRYPTO_SERVICE_AKCIPHER,
VIRTIO_CRYPTO_AKCIPHER_RSA);
if (!vcrypto) {
pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
return -ENODEV;
}
ctx->vcrypto = vcrypto;
} else {
virtio_crypto_alg_akcipher_close_session(ctx);
}
/* set ctrl header */
header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION);
header.algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
header.queue_id = 0;
/* set RSA para */
para.algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
para.keytype = cpu_to_le32(keytype);
para.keylen = cpu_to_le32(keylen);
para.u.rsa.padding_algo = cpu_to_le32(padding_algo);
para.u.rsa.hash_algo = cpu_to_le32(hash_algo);
return virtio_crypto_alg_akcipher_init_session(ctx, &header, &para, key, keylen);
}
static int virtio_crypto_rsa_raw_set_priv_key(struct crypto_akcipher *tfm,
const void *key,
unsigned int keylen)
{
return virtio_crypto_rsa_set_key(tfm, key, keylen, 1,
VIRTIO_CRYPTO_RSA_RAW_PADDING,
VIRTIO_CRYPTO_RSA_NO_HASH);
}
static int virtio_crypto_p1pad_rsa_sha1_set_priv_key(struct crypto_akcipher *tfm,
const void *key,
unsigned int keylen)
{
return virtio_crypto_rsa_set_key(tfm, key, keylen, 1,
VIRTIO_CRYPTO_RSA_PKCS1_PADDING,
VIRTIO_CRYPTO_RSA_SHA1);
}
static int virtio_crypto_rsa_raw_set_pub_key(struct crypto_akcipher *tfm,
const void *key,
unsigned int keylen)
{
return virtio_crypto_rsa_set_key(tfm, key, keylen, 0,
VIRTIO_CRYPTO_RSA_RAW_PADDING,
VIRTIO_CRYPTO_RSA_NO_HASH);
}
static int virtio_crypto_p1pad_rsa_sha1_set_pub_key(struct crypto_akcipher *tfm,
const void *key,
unsigned int keylen)
{
return virtio_crypto_rsa_set_key(tfm, key, keylen, 0,
VIRTIO_CRYPTO_RSA_PKCS1_PADDING,
VIRTIO_CRYPTO_RSA_SHA1);
}
static unsigned int virtio_crypto_rsa_max_size(struct crypto_akcipher *tfm)
{
struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
return mpi_get_size(rsa_ctx->n);
}
static int virtio_crypto_rsa_init_tfm(struct crypto_akcipher *tfm)
{
struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
ctx->tfm = tfm;
akcipher_set_reqsize(tfm,
sizeof(struct virtio_crypto_akcipher_request));
return 0;
}
static void virtio_crypto_rsa_exit_tfm(struct crypto_akcipher *tfm)
{
struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
virtio_crypto_alg_akcipher_close_session(ctx);
virtcrypto_dev_put(ctx->vcrypto);
mpi_free(rsa_ctx->n);
rsa_ctx->n = NULL;
}
static struct virtio_crypto_akcipher_algo virtio_crypto_akcipher_algs[] = {
{
.algonum = VIRTIO_CRYPTO_AKCIPHER_RSA,
.service = VIRTIO_CRYPTO_SERVICE_AKCIPHER,
.algo.base = {
.encrypt = virtio_crypto_rsa_encrypt,
.decrypt = virtio_crypto_rsa_decrypt,
.set_pub_key = virtio_crypto_rsa_raw_set_pub_key,
.set_priv_key = virtio_crypto_rsa_raw_set_priv_key,
.max_size = virtio_crypto_rsa_max_size,
.init = virtio_crypto_rsa_init_tfm,
.exit = virtio_crypto_rsa_exit_tfm,
.base = {
.cra_name = "rsa",
.cra_driver_name = "virtio-crypto-rsa",
.cra_priority = 150,
.cra_module = THIS_MODULE,
.cra_ctxsize = sizeof(struct virtio_crypto_akcipher_ctx),
},
},
.algo.op = {
.do_one_request = virtio_crypto_rsa_do_req,
},
},
{
.algonum = VIRTIO_CRYPTO_AKCIPHER_RSA,
.service = VIRTIO_CRYPTO_SERVICE_AKCIPHER,
.algo.base = {
.encrypt = virtio_crypto_rsa_encrypt,
.decrypt = virtio_crypto_rsa_decrypt,
.sign = virtio_crypto_rsa_sign,
.verify = virtio_crypto_rsa_verify,
.set_pub_key = virtio_crypto_p1pad_rsa_sha1_set_pub_key,
.set_priv_key = virtio_crypto_p1pad_rsa_sha1_set_priv_key,
.max_size = virtio_crypto_rsa_max_size,
.init = virtio_crypto_rsa_init_tfm,
.exit = virtio_crypto_rsa_exit_tfm,
.base = {
.cra_name = "pkcs1pad(rsa,sha1)",
.cra_driver_name = "virtio-pkcs1-rsa-with-sha1",
.cra_priority = 150,
.cra_module = THIS_MODULE,
.cra_ctxsize = sizeof(struct virtio_crypto_akcipher_ctx),
},
},
.algo.op = {
.do_one_request = virtio_crypto_rsa_do_req,
},
},
};
int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto)
{
int ret = 0;
int i = 0;
mutex_lock(&algs_lock);
for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
uint32_t service = virtio_crypto_akcipher_algs[i].service;
uint32_t algonum = virtio_crypto_akcipher_algs[i].algonum;
if (!virtcrypto_algo_is_supported(vcrypto, service, algonum))
continue;
if (virtio_crypto_akcipher_algs[i].active_devs == 0) {
ret = crypto_engine_register_akcipher(&virtio_crypto_akcipher_algs[i].algo);
if (ret)
goto unlock;
}
virtio_crypto_akcipher_algs[i].active_devs++;
dev_info(&vcrypto->vdev->dev, "Registered akcipher algo %s\n",
virtio_crypto_akcipher_algs[i].algo.base.base.cra_name);
}
unlock:
mutex_unlock(&algs_lock);
return ret;
}
void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto *vcrypto)
{
int i = 0;
mutex_lock(&algs_lock);
for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
uint32_t service = virtio_crypto_akcipher_algs[i].service;
uint32_t algonum = virtio_crypto_akcipher_algs[i].algonum;
if (virtio_crypto_akcipher_algs[i].active_devs == 0 ||
!virtcrypto_algo_is_supported(vcrypto, service, algonum))
continue;
if (virtio_crypto_akcipher_algs[i].active_devs == 1)
crypto_engine_unregister_akcipher(&virtio_crypto_akcipher_algs[i].algo);
virtio_crypto_akcipher_algs[i].active_devs--;
}
mutex_unlock(&algs_lock);
}