diff options
Diffstat (limited to 'drivers/crypto/virtio/virtio_crypto_akcipher_algs.c')
| -rw-r--r-- | drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 594 |
1 files changed, 594 insertions, 0 deletions
diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c new file mode 100644 index 000000000000..168195672e2e --- /dev/null +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c @@ -0,0 +1,594 @@ +// 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 <linux/mpi.h> +#include <linux/scatterlist.h> +#include <crypto/algapi.h> +#include <crypto/internal/akcipher.h> +#include <crypto/internal/rsa.h> +#include <linux/err.h> +#include <crypto/scatterwalk.h> +#include <linux/atomic.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 crypto_engine_ctx enginectx; + 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_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, void *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_ATOMIC); + 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, para, sizeof(ctrl->u)); + 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 = NULL, *dst_buf = NULL; + unsigned int num_out = 0, num_in = 0; + int node = dev_to_node(&vcrypto->vdev->dev); + unsigned long flags; + int ret = -ENOMEM; + 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) + goto err; + + 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 err; + + 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(src_buf); + kfree(dst_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, ¶, 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; + ctx->enginectx.op.do_one_request = virtio_crypto_rsa_do_req; + ctx->enginectx.op.prepare_request = NULL; + ctx->enginectx.op.unprepare_request = NULL; + + 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 = { + .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, + .reqsize = sizeof(struct virtio_crypto_akcipher_request), + .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), + }, + }, + }, + { + .algonum = VIRTIO_CRYPTO_AKCIPHER_RSA, + .service = VIRTIO_CRYPTO_SERVICE_AKCIPHER, + .algo = { + .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, + .reqsize = sizeof(struct virtio_crypto_akcipher_request), + .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), + }, + }, + }, +}; + +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_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.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_unregister_akcipher(&virtio_crypto_akcipher_algs[i].algo); + + virtio_crypto_akcipher_algs[i].active_devs--; + } + + mutex_unlock(&algs_lock); +} |