[CRYPTO] cryptd: Add software async crypto daemon
This patch adds the cryptd module which is a template that takes a synchronous software crypto algorithm and converts it to an asynchronous one by executing it in a kernel thread. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
Родитель
a73e69965f
Коммит
124b53d020
|
|
@ -175,6 +175,15 @@ config CRYPTO_LRW
|
|||
The first 128, 192 or 256 bits in the key are used for AES and the
|
||||
rest is used to tie each cipher block to its logical position.
|
||||
|
||||
config CRYPTO_CRYPTD
|
||||
tristate "Software async crypto daemon"
|
||||
select CRYPTO_ABLKCIPHER
|
||||
select CRYPTO_MANAGER
|
||||
help
|
||||
This is a generic software asynchronous crypto daemon that
|
||||
converts an arbitrary synchronous software crypto algorithm
|
||||
into an asynchronous algorithm that executes in a kernel thread.
|
||||
|
||||
config CRYPTO_DES
|
||||
tristate "DES and Triple DES EDE cipher algorithms"
|
||||
select CRYPTO_ALGAPI
|
||||
|
|
|
|||
|
|
@ -30,6 +30,7 @@ obj-$(CONFIG_CRYPTO_ECB) += ecb.o
|
|||
obj-$(CONFIG_CRYPTO_CBC) += cbc.o
|
||||
obj-$(CONFIG_CRYPTO_PCBC) += pcbc.o
|
||||
obj-$(CONFIG_CRYPTO_LRW) += lrw.o
|
||||
obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
|
||||
obj-$(CONFIG_CRYPTO_DES) += des.o
|
||||
obj-$(CONFIG_CRYPTO_FCRYPT) += fcrypt.o
|
||||
obj-$(CONFIG_CRYPTO_BLOWFISH) += blowfish.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,375 @@
|
|||
/*
|
||||
* Software async crypto daemon.
|
||||
*
|
||||
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the Free
|
||||
* Software Foundation; either version 2 of the License, or (at your option)
|
||||
* any later version.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <crypto/algapi.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/kthread.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/spinlock.h>
|
||||
|
||||
#define CRYPTD_MAX_QLEN 100
|
||||
|
||||
struct cryptd_state {
|
||||
spinlock_t lock;
|
||||
struct mutex mutex;
|
||||
struct crypto_queue queue;
|
||||
struct task_struct *task;
|
||||
};
|
||||
|
||||
struct cryptd_instance_ctx {
|
||||
struct crypto_spawn spawn;
|
||||
struct cryptd_state *state;
|
||||
};
|
||||
|
||||
struct cryptd_blkcipher_ctx {
|
||||
struct crypto_blkcipher *child;
|
||||
};
|
||||
|
||||
struct cryptd_blkcipher_request_ctx {
|
||||
crypto_completion_t complete;
|
||||
};
|
||||
|
||||
|
||||
static inline struct cryptd_state *cryptd_get_state(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
|
||||
struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
|
||||
return ictx->state;
|
||||
}
|
||||
|
||||
static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
|
||||
const u8 *key, unsigned int keylen)
|
||||
{
|
||||
struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
|
||||
struct crypto_blkcipher *child = ctx->child;
|
||||
int err;
|
||||
|
||||
crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
||||
crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
|
||||
CRYPTO_TFM_REQ_MASK);
|
||||
err = crypto_blkcipher_setkey(child, key, keylen);
|
||||
crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
|
||||
CRYPTO_TFM_RES_MASK);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
|
||||
struct crypto_blkcipher *child,
|
||||
int err,
|
||||
int (*crypt)(struct blkcipher_desc *desc,
|
||||
struct scatterlist *dst,
|
||||
struct scatterlist *src,
|
||||
unsigned int len))
|
||||
{
|
||||
struct cryptd_blkcipher_request_ctx *rctx;
|
||||
struct blkcipher_desc desc;
|
||||
|
||||
rctx = ablkcipher_request_ctx(req);
|
||||
|
||||
if (unlikely(err == -EINPROGRESS)) {
|
||||
rctx->complete(&req->base, err);
|
||||
return;
|
||||
}
|
||||
|
||||
desc.tfm = child;
|
||||
desc.info = req->info;
|
||||
desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
||||
|
||||
err = crypt(&desc, req->dst, req->src, req->nbytes);
|
||||
|
||||
req->base.complete = rctx->complete;
|
||||
|
||||
local_bh_disable();
|
||||
req->base.complete(&req->base, err);
|
||||
local_bh_enable();
|
||||
}
|
||||
|
||||
static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
|
||||
{
|
||||
struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
|
||||
struct crypto_blkcipher *child = ctx->child;
|
||||
|
||||
cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
|
||||
crypto_blkcipher_crt(child)->encrypt);
|
||||
}
|
||||
|
||||
static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
|
||||
{
|
||||
struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
|
||||
struct crypto_blkcipher *child = ctx->child;
|
||||
|
||||
cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
|
||||
crypto_blkcipher_crt(child)->decrypt);
|
||||
}
|
||||
|
||||
static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
|
||||
crypto_completion_t complete)
|
||||
{
|
||||
struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
|
||||
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
|
||||
struct cryptd_state *state =
|
||||
cryptd_get_state(crypto_ablkcipher_tfm(tfm));
|
||||
int err;
|
||||
|
||||
rctx->complete = req->base.complete;
|
||||
req->base.complete = complete;
|
||||
|
||||
spin_lock_bh(&state->lock);
|
||||
err = ablkcipher_enqueue_request(crypto_ablkcipher_alg(tfm), req);
|
||||
spin_unlock_bh(&state->lock);
|
||||
|
||||
wake_up_process(state->task);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
|
||||
{
|
||||
return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
|
||||
}
|
||||
|
||||
static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
|
||||
{
|
||||
return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
|
||||
}
|
||||
|
||||
static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
|
||||
struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
|
||||
struct crypto_spawn *spawn = &ictx->spawn;
|
||||
struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
struct crypto_blkcipher *cipher;
|
||||
|
||||
cipher = crypto_spawn_blkcipher(spawn);
|
||||
if (IS_ERR(cipher))
|
||||
return PTR_ERR(cipher);
|
||||
|
||||
ctx->child = cipher;
|
||||
tfm->crt_ablkcipher.reqsize =
|
||||
sizeof(struct cryptd_blkcipher_request_ctx);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
struct cryptd_state *state = cryptd_get_state(tfm);
|
||||
int active;
|
||||
|
||||
mutex_lock(&state->mutex);
|
||||
active = ablkcipher_tfm_in_queue(__crypto_ablkcipher_cast(tfm));
|
||||
mutex_unlock(&state->mutex);
|
||||
|
||||
BUG_ON(active);
|
||||
|
||||
crypto_free_blkcipher(ctx->child);
|
||||
}
|
||||
|
||||
static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
|
||||
struct cryptd_state *state)
|
||||
{
|
||||
struct crypto_instance *inst;
|
||||
struct cryptd_instance_ctx *ctx;
|
||||
int err;
|
||||
|
||||
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
|
||||
if (IS_ERR(inst))
|
||||
goto out;
|
||||
|
||||
err = -ENAMETOOLONG;
|
||||
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
||||
"cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
||||
goto out_free_inst;
|
||||
|
||||
ctx = crypto_instance_ctx(inst);
|
||||
err = crypto_init_spawn(&ctx->spawn, alg, inst,
|
||||
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
|
||||
if (err)
|
||||
goto out_free_inst;
|
||||
|
||||
ctx->state = state;
|
||||
|
||||
memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
|
||||
|
||||
inst->alg.cra_priority = alg->cra_priority + 50;
|
||||
inst->alg.cra_blocksize = alg->cra_blocksize;
|
||||
inst->alg.cra_alignmask = alg->cra_alignmask;
|
||||
|
||||
out:
|
||||
return inst;
|
||||
|
||||
out_free_inst:
|
||||
kfree(inst);
|
||||
inst = ERR_PTR(err);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static struct crypto_instance *cryptd_alloc_blkcipher(
|
||||
struct rtattr **tb, struct cryptd_state *state)
|
||||
{
|
||||
struct crypto_instance *inst;
|
||||
struct crypto_alg *alg;
|
||||
|
||||
alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
|
||||
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
|
||||
if (IS_ERR(alg))
|
||||
return ERR_PTR(PTR_ERR(alg));
|
||||
|
||||
inst = cryptd_alloc_instance(alg, state);
|
||||
if (IS_ERR(inst))
|
||||
goto out_put_alg;
|
||||
|
||||
inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_ASYNC;
|
||||
inst->alg.cra_type = &crypto_ablkcipher_type;
|
||||
|
||||
inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
|
||||
inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
|
||||
inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
|
||||
|
||||
inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
|
||||
|
||||
inst->alg.cra_init = cryptd_blkcipher_init_tfm;
|
||||
inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
|
||||
|
||||
inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
|
||||
inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
|
||||
inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
|
||||
|
||||
inst->alg.cra_ablkcipher.queue = &state->queue;
|
||||
|
||||
out_put_alg:
|
||||
crypto_mod_put(alg);
|
||||
return inst;
|
||||
}
|
||||
|
||||
static struct cryptd_state state;
|
||||
|
||||
static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
|
||||
{
|
||||
struct crypto_attr_type *algt;
|
||||
|
||||
algt = crypto_get_attr_type(tb);
|
||||
if (IS_ERR(algt))
|
||||
return ERR_PTR(PTR_ERR(algt));
|
||||
|
||||
switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
|
||||
case CRYPTO_ALG_TYPE_BLKCIPHER:
|
||||
return cryptd_alloc_blkcipher(tb, &state);
|
||||
}
|
||||
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
static void cryptd_free(struct crypto_instance *inst)
|
||||
{
|
||||
struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
|
||||
|
||||
crypto_drop_spawn(&ctx->spawn);
|
||||
kfree(inst);
|
||||
}
|
||||
|
||||
static struct crypto_template cryptd_tmpl = {
|
||||
.name = "cryptd",
|
||||
.alloc = cryptd_alloc,
|
||||
.free = cryptd_free,
|
||||
.module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static inline int cryptd_create_thread(struct cryptd_state *state,
|
||||
int (*fn)(void *data), const char *name)
|
||||
{
|
||||
spin_lock_init(&state->lock);
|
||||
mutex_init(&state->mutex);
|
||||
crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);
|
||||
|
||||
state->task = kthread_create(fn, state, name);
|
||||
if (IS_ERR(state->task))
|
||||
return PTR_ERR(state->task);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void cryptd_stop_thread(struct cryptd_state *state)
|
||||
{
|
||||
BUG_ON(state->queue.qlen);
|
||||
kthread_stop(state->task);
|
||||
}
|
||||
|
||||
static int cryptd_thread(void *data)
|
||||
{
|
||||
struct cryptd_state *state = data;
|
||||
int stop;
|
||||
|
||||
do {
|
||||
struct crypto_async_request *req, *backlog;
|
||||
|
||||
mutex_lock(&state->mutex);
|
||||
__set_current_state(TASK_INTERRUPTIBLE);
|
||||
|
||||
spin_lock_bh(&state->lock);
|
||||
backlog = crypto_get_backlog(&state->queue);
|
||||
req = crypto_dequeue_request(&state->queue);
|
||||
spin_unlock_bh(&state->lock);
|
||||
|
||||
stop = kthread_should_stop();
|
||||
|
||||
if (stop || req) {
|
||||
__set_current_state(TASK_RUNNING);
|
||||
if (req) {
|
||||
if (backlog)
|
||||
backlog->complete(backlog,
|
||||
-EINPROGRESS);
|
||||
req->complete(req, 0);
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&state->mutex);
|
||||
|
||||
schedule();
|
||||
} while (!stop);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init cryptd_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = crypto_register_template(&cryptd_tmpl);
|
||||
if (err)
|
||||
kthread_stop(state.task);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit cryptd_exit(void)
|
||||
{
|
||||
cryptd_stop_thread(&state);
|
||||
crypto_unregister_template(&cryptd_tmpl);
|
||||
}
|
||||
|
||||
module_init(cryptd_init);
|
||||
module_exit(cryptd_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("Software async crypto daemon");
|
||||
|
|
@ -138,6 +138,12 @@ static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
|
|||
return (void *)ALIGN(addr, align);
|
||||
}
|
||||
|
||||
static inline struct crypto_instance *crypto_tfm_alg_instance(
|
||||
struct crypto_tfm *tfm)
|
||||
{
|
||||
return container_of(tfm->__crt_alg, struct crypto_instance, alg);
|
||||
}
|
||||
|
||||
static inline void *crypto_instance_ctx(struct crypto_instance *inst)
|
||||
{
|
||||
return inst->__ctx;
|
||||
|
|
@ -154,6 +160,15 @@ static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
|
|||
return crypto_tfm_ctx(&tfm->base);
|
||||
}
|
||||
|
||||
static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
|
||||
struct crypto_spawn *spawn)
|
||||
{
|
||||
u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
|
||||
u32 mask = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC;
|
||||
|
||||
return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
|
||||
}
|
||||
|
||||
static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
|
||||
{
|
||||
return crypto_tfm_ctx(&tfm->base);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче