linux/crypto/cryptd.c
Eric Biggers c79b411eaa crypto: skcipher - remove remnants of internal IV generators
Remove dead code related to internal IV generators, which are no longer
used since they've been replaced with the "seqiv" and "echainiv"
templates.  The removed code includes:

- The "givcipher" (GIVCIPHER) algorithm type.  No algorithms are
  registered with this type anymore, so it's unneeded.

- The "const char *geniv" member of aead_alg, ablkcipher_alg, and
  blkcipher_alg.  A few algorithms still set this, but it isn't used
  anymore except to show via /proc/crypto and CRYPTO_MSG_GETALG.
  Just hardcode "<default>" or "<none>" in those cases.

- The 'skcipher_givcrypt_request' structure, which is never used.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-12-23 11:52:45 +08:00

1401 lines
36 KiB
C

/*
* Software async crypto daemon.
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*
* Added AEAD support to cryptd.
* Authors: Tadeusz Struk (tadeusz.struk@intel.com)
* Adrian Hoban <adrian.hoban@intel.com>
* Gabriele Paoloni <gabriele.paoloni@intel.com>
* Aidan O'Mahony (aidan.o.mahony@intel.com)
* Copyright (c) 2010, Intel Corporation.
*
* 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/internal/hash.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/cryptd.h>
#include <crypto/crypto_wq.h>
#include <linux/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
static unsigned int cryptd_max_cpu_qlen = 1000;
module_param(cryptd_max_cpu_qlen, uint, 0);
MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth");
struct cryptd_cpu_queue {
struct crypto_queue queue;
struct work_struct work;
};
struct cryptd_queue {
struct cryptd_cpu_queue __percpu *cpu_queue;
};
struct cryptd_instance_ctx {
struct crypto_spawn spawn;
struct cryptd_queue *queue;
};
struct skcipherd_instance_ctx {
struct crypto_skcipher_spawn spawn;
struct cryptd_queue *queue;
};
struct hashd_instance_ctx {
struct crypto_shash_spawn spawn;
struct cryptd_queue *queue;
};
struct aead_instance_ctx {
struct crypto_aead_spawn aead_spawn;
struct cryptd_queue *queue;
};
struct cryptd_blkcipher_ctx {
atomic_t refcnt;
struct crypto_blkcipher *child;
};
struct cryptd_blkcipher_request_ctx {
crypto_completion_t complete;
};
struct cryptd_skcipher_ctx {
atomic_t refcnt;
struct crypto_sync_skcipher *child;
};
struct cryptd_skcipher_request_ctx {
crypto_completion_t complete;
};
struct cryptd_hash_ctx {
atomic_t refcnt;
struct crypto_shash *child;
};
struct cryptd_hash_request_ctx {
crypto_completion_t complete;
struct shash_desc desc;
};
struct cryptd_aead_ctx {
atomic_t refcnt;
struct crypto_aead *child;
};
struct cryptd_aead_request_ctx {
crypto_completion_t complete;
};
static void cryptd_queue_worker(struct work_struct *work);
static int cryptd_init_queue(struct cryptd_queue *queue,
unsigned int max_cpu_qlen)
{
int cpu;
struct cryptd_cpu_queue *cpu_queue;
queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
if (!queue->cpu_queue)
return -ENOMEM;
for_each_possible_cpu(cpu) {
cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
}
pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen);
return 0;
}
static void cryptd_fini_queue(struct cryptd_queue *queue)
{
int cpu;
struct cryptd_cpu_queue *cpu_queue;
for_each_possible_cpu(cpu) {
cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
BUG_ON(cpu_queue->queue.qlen);
}
free_percpu(queue->cpu_queue);
}
static int cryptd_enqueue_request(struct cryptd_queue *queue,
struct crypto_async_request *request)
{
int cpu, err;
struct cryptd_cpu_queue *cpu_queue;
atomic_t *refcnt;
cpu = get_cpu();
cpu_queue = this_cpu_ptr(queue->cpu_queue);
err = crypto_enqueue_request(&cpu_queue->queue, request);
refcnt = crypto_tfm_ctx(request->tfm);
if (err == -ENOSPC)
goto out_put_cpu;
queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
if (!atomic_read(refcnt))
goto out_put_cpu;
atomic_inc(refcnt);
out_put_cpu:
put_cpu();
return err;
}
/* Called in workqueue context, do one real cryption work (via
* req->complete) and reschedule itself if there are more work to
* do. */
static void cryptd_queue_worker(struct work_struct *work)
{
struct cryptd_cpu_queue *cpu_queue;
struct crypto_async_request *req, *backlog;
cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
/*
* Only handle one request at a time to avoid hogging crypto workqueue.
* preempt_disable/enable is used to prevent being preempted by
* cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
* cryptd_enqueue_request() being accessed from software interrupts.
*/
local_bh_disable();
preempt_disable();
backlog = crypto_get_backlog(&cpu_queue->queue);
req = crypto_dequeue_request(&cpu_queue->queue);
preempt_enable();
local_bh_enable();
if (!req)
return;
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
req->complete(req, 0);
if (cpu_queue->queue.qlen)
queue_work(kcrypto_wq, &cpu_queue->work);
}
static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
return ictx->queue;
}
static inline void cryptd_check_internal(struct rtattr **tb, u32 *type,
u32 *mask)
{
struct crypto_attr_type *algt;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return;
*type |= algt->type & CRYPTO_ALG_INTERNAL;
*mask |= algt->mask & CRYPTO_ALG_INTERNAL;
}
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 cryptd_blkcipher_ctx *ctx;
struct crypto_ablkcipher *tfm;
struct blkcipher_desc desc;
int refcnt;
rctx = ablkcipher_request_ctx(req);
if (unlikely(err == -EINPROGRESS))
goto out;
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;
out:
tfm = crypto_ablkcipher_reqtfm(req);
ctx = crypto_ablkcipher_ctx(tfm);
refcnt = atomic_read(&ctx->refcnt);
local_bh_disable();
rctx->complete(&req->base, err);
local_bh_enable();
if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
crypto_free_ablkcipher(tfm);
}
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 compl)
{
struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct cryptd_queue *queue;
queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = compl;
return cryptd_enqueue_request(queue, &req->base);
}
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);
crypto_free_blkcipher(ctx->child);
}
static int cryptd_init_instance(struct crypto_instance *inst,
struct crypto_alg *alg)
{
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"cryptd(%s)",
alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
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;
return 0;
}
static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
unsigned int tail)
{
char *p;
struct crypto_instance *inst;
int err;
p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
inst = (void *)(p + head);
err = cryptd_init_instance(inst, alg);
if (err)
goto out_free_inst;
out:
return p;
out_free_inst:
kfree(p);
p = ERR_PTR(err);
goto out;
}
static int cryptd_create_blkcipher(struct crypto_template *tmpl,
struct rtattr **tb,
struct cryptd_queue *queue)
{
struct cryptd_instance_ctx *ctx;
struct crypto_instance *inst;
struct crypto_alg *alg;
u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
u32 mask = CRYPTO_ALG_TYPE_MASK;
int err;
cryptd_check_internal(tb, &type, &mask);
alg = crypto_get_attr_alg(tb, type, mask);
if (IS_ERR(alg))
return PTR_ERR(alg);
inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
err = PTR_ERR(inst);
if (IS_ERR(inst))
goto out_put_alg;
ctx = crypto_instance_ctx(inst);
ctx->queue = queue;
err = crypto_init_spawn(&ctx->spawn, alg, inst,
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
if (err)
goto out_free_inst;
type = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
type |= CRYPTO_ALG_INTERNAL;
inst->alg.cra_flags = type;
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;
err = crypto_register_instance(tmpl, inst);
if (err) {
crypto_drop_spawn(&ctx->spawn);
out_free_inst:
kfree(inst);
}
out_put_alg:
crypto_mod_put(alg);
return err;
}
static int cryptd_skcipher_setkey(struct crypto_skcipher *parent,
const u8 *key, unsigned int keylen)
{
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent);
struct crypto_sync_skcipher *child = ctx->child;
int err;
crypto_sync_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(child,
crypto_skcipher_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_sync_skcipher_setkey(child, key, keylen);
crypto_skcipher_set_flags(parent,
crypto_sync_skcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
static void cryptd_skcipher_complete(struct skcipher_request *req, int err)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
int refcnt = atomic_read(&ctx->refcnt);
local_bh_disable();
rctx->complete(&req->base, err);
local_bh_enable();
if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
crypto_free_skcipher(tfm);
}
static void cryptd_skcipher_encrypt(struct crypto_async_request *base,
int err)
{
struct skcipher_request *req = skcipher_request_cast(base);
struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_sync_skcipher *child = ctx->child;
SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
if (unlikely(err == -EINPROGRESS))
goto out;
skcipher_request_set_sync_tfm(subreq, child);
skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
err = crypto_skcipher_encrypt(subreq);
skcipher_request_zero(subreq);
req->base.complete = rctx->complete;
out:
cryptd_skcipher_complete(req, err);
}
static void cryptd_skcipher_decrypt(struct crypto_async_request *base,
int err)
{
struct skcipher_request *req = skcipher_request_cast(base);
struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_sync_skcipher *child = ctx->child;
SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
if (unlikely(err == -EINPROGRESS))
goto out;
skcipher_request_set_sync_tfm(subreq, child);
skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
err = crypto_skcipher_decrypt(subreq);
skcipher_request_zero(subreq);
req->base.complete = rctx->complete;
out:
cryptd_skcipher_complete(req, err);
}
static int cryptd_skcipher_enqueue(struct skcipher_request *req,
crypto_completion_t compl)
{
struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cryptd_queue *queue;
queue = cryptd_get_queue(crypto_skcipher_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = compl;
return cryptd_enqueue_request(queue, &req->base);
}
static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req)
{
return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt);
}
static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req)
{
return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt);
}
static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm)
{
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst);
struct crypto_skcipher_spawn *spawn = &ictx->spawn;
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_skcipher *cipher;
cipher = crypto_spawn_skcipher(spawn);
if (IS_ERR(cipher))
return PTR_ERR(cipher);
ctx->child = (struct crypto_sync_skcipher *)cipher;
crypto_skcipher_set_reqsize(
tfm, sizeof(struct cryptd_skcipher_request_ctx));
return 0;
}
static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm)
{
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_sync_skcipher(ctx->child);
}
static void cryptd_skcipher_free(struct skcipher_instance *inst)
{
struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst);
crypto_drop_skcipher(&ctx->spawn);
}
static int cryptd_create_skcipher(struct crypto_template *tmpl,
struct rtattr **tb,
struct cryptd_queue *queue)
{
struct skcipherd_instance_ctx *ctx;
struct skcipher_instance *inst;
struct skcipher_alg *alg;
const char *name;
u32 type;
u32 mask;
int err;
type = 0;
mask = CRYPTO_ALG_ASYNC;
cryptd_check_internal(tb, &type, &mask);
name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(name))
return PTR_ERR(name);
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return -ENOMEM;
ctx = skcipher_instance_ctx(inst);
ctx->queue = queue;
crypto_set_skcipher_spawn(&ctx->spawn, skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->spawn, name, type, mask);
if (err)
goto out_free_inst;
alg = crypto_spawn_skcipher_alg(&ctx->spawn);
err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base);
if (err)
goto out_drop_skcipher;
inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
(alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
inst->alg.ivsize = crypto_skcipher_alg_ivsize(alg);
inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx);
inst->alg.init = cryptd_skcipher_init_tfm;
inst->alg.exit = cryptd_skcipher_exit_tfm;
inst->alg.setkey = cryptd_skcipher_setkey;
inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue;
inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue;
inst->free = cryptd_skcipher_free;
err = skcipher_register_instance(tmpl, inst);
if (err) {
out_drop_skcipher:
crypto_drop_skcipher(&ctx->spawn);
out_free_inst:
kfree(inst);
}
return err;
}
static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
struct crypto_shash_spawn *spawn = &ictx->spawn;
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_shash *hash;
hash = crypto_spawn_shash(spawn);
if (IS_ERR(hash))
return PTR_ERR(hash);
ctx->child = hash;
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct cryptd_hash_request_ctx) +
crypto_shash_descsize(hash));
return 0;
}
static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
{
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_shash(ctx->child);
}
static int cryptd_hash_setkey(struct crypto_ahash *parent,
const u8 *key, unsigned int keylen)
{
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent);
struct crypto_shash *child = ctx->child;
int err;
crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
err = crypto_shash_setkey(child, key, keylen);
crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
static int cryptd_hash_enqueue(struct ahash_request *req,
crypto_completion_t compl)
{
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct cryptd_queue *queue =
cryptd_get_queue(crypto_ahash_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = compl;
return cryptd_enqueue_request(queue, &req->base);
}
static void cryptd_hash_complete(struct ahash_request *req, int err)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
int refcnt = atomic_read(&ctx->refcnt);
local_bh_disable();
rctx->complete(&req->base, err);
local_bh_enable();
if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
crypto_free_ahash(tfm);
}
static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
{
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
struct crypto_shash *child = ctx->child;
struct ahash_request *req = ahash_request_cast(req_async);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct shash_desc *desc = &rctx->desc;
if (unlikely(err == -EINPROGRESS))
goto out;
desc->tfm = child;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
err = crypto_shash_init(desc);
req->base.complete = rctx->complete;
out:
cryptd_hash_complete(req, err);
}
static int cryptd_hash_init_enqueue(struct ahash_request *req)
{
return cryptd_hash_enqueue(req, cryptd_hash_init);
}
static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
{
struct ahash_request *req = ahash_request_cast(req_async);
struct cryptd_hash_request_ctx *rctx;
rctx = ahash_request_ctx(req);
if (unlikely(err == -EINPROGRESS))
goto out;
err = shash_ahash_update(req, &rctx->desc);
req->base.complete = rctx->complete;
out:
cryptd_hash_complete(req, err);
}
static int cryptd_hash_update_enqueue(struct ahash_request *req)
{
return cryptd_hash_enqueue(req, cryptd_hash_update);
}
static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
{
struct ahash_request *req = ahash_request_cast(req_async);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
if (unlikely(err == -EINPROGRESS))
goto out;
err = crypto_shash_final(&rctx->desc, req->result);
req->base.complete = rctx->complete;
out:
cryptd_hash_complete(req, err);
}
static int cryptd_hash_final_enqueue(struct ahash_request *req)
{
return cryptd_hash_enqueue(req, cryptd_hash_final);
}
static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
{
struct ahash_request *req = ahash_request_cast(req_async);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
if (unlikely(err == -EINPROGRESS))
goto out;
err = shash_ahash_finup(req, &rctx->desc);
req->base.complete = rctx->complete;
out:
cryptd_hash_complete(req, err);
}
static int cryptd_hash_finup_enqueue(struct ahash_request *req)
{
return cryptd_hash_enqueue(req, cryptd_hash_finup);
}
static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
{
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
struct crypto_shash *child = ctx->child;
struct ahash_request *req = ahash_request_cast(req_async);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct shash_desc *desc = &rctx->desc;
if (unlikely(err == -EINPROGRESS))
goto out;
desc->tfm = child;
desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
err = shash_ahash_digest(req, desc);
req->base.complete = rctx->complete;
out:
cryptd_hash_complete(req, err);
}
static int cryptd_hash_digest_enqueue(struct ahash_request *req)
{
return cryptd_hash_enqueue(req, cryptd_hash_digest);
}
static int cryptd_hash_export(struct ahash_request *req, void *out)
{
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
return crypto_shash_export(&rctx->desc, out);
}
static int cryptd_hash_import(struct ahash_request *req, const void *in)
{
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
struct shash_desc *desc = cryptd_shash_desc(req);
desc->tfm = ctx->child;
desc->flags = req->base.flags;
return crypto_shash_import(desc, in);
}
static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
struct cryptd_queue *queue)
{
struct hashd_instance_ctx *ctx;
struct ahash_instance *inst;
struct shash_alg *salg;
struct crypto_alg *alg;
u32 type = 0;
u32 mask = 0;
int err;
cryptd_check_internal(tb, &type, &mask);
salg = shash_attr_alg(tb[1], type, mask);
if (IS_ERR(salg))
return PTR_ERR(salg);
alg = &salg->base;
inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
sizeof(*ctx));
err = PTR_ERR(inst);
if (IS_ERR(inst))
goto out_put_alg;
ctx = ahash_instance_ctx(inst);
ctx->queue = queue;
err = crypto_init_shash_spawn(&ctx->spawn, salg,
ahash_crypto_instance(inst));
if (err)
goto out_free_inst;
inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
(alg->cra_flags & (CRYPTO_ALG_INTERNAL |
CRYPTO_ALG_OPTIONAL_KEY));
inst->alg.halg.digestsize = salg->digestsize;
inst->alg.halg.statesize = salg->statesize;
inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
inst->alg.init = cryptd_hash_init_enqueue;
inst->alg.update = cryptd_hash_update_enqueue;
inst->alg.final = cryptd_hash_final_enqueue;
inst->alg.finup = cryptd_hash_finup_enqueue;
inst->alg.export = cryptd_hash_export;
inst->alg.import = cryptd_hash_import;
if (crypto_shash_alg_has_setkey(salg))
inst->alg.setkey = cryptd_hash_setkey;
inst->alg.digest = cryptd_hash_digest_enqueue;
err = ahash_register_instance(tmpl, inst);
if (err) {
crypto_drop_shash(&ctx->spawn);
out_free_inst:
kfree(inst);
}
out_put_alg:
crypto_mod_put(alg);
return err;
}
static int cryptd_aead_setkey(struct crypto_aead *parent,
const u8 *key, unsigned int keylen)
{
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
struct crypto_aead *child = ctx->child;
return crypto_aead_setkey(child, key, keylen);
}
static int cryptd_aead_setauthsize(struct crypto_aead *parent,
unsigned int authsize)
{
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
struct crypto_aead *child = ctx->child;
return crypto_aead_setauthsize(child, authsize);
}
static void cryptd_aead_crypt(struct aead_request *req,
struct crypto_aead *child,
int err,
int (*crypt)(struct aead_request *req))
{
struct cryptd_aead_request_ctx *rctx;
struct cryptd_aead_ctx *ctx;
crypto_completion_t compl;
struct crypto_aead *tfm;
int refcnt;
rctx = aead_request_ctx(req);
compl = rctx->complete;
tfm = crypto_aead_reqtfm(req);
if (unlikely(err == -EINPROGRESS))
goto out;
aead_request_set_tfm(req, child);
err = crypt( req );
out:
ctx = crypto_aead_ctx(tfm);
refcnt = atomic_read(&ctx->refcnt);
local_bh_disable();
compl(&req->base, err);
local_bh_enable();
if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
crypto_free_aead(tfm);
}
static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
{
struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
struct crypto_aead *child = ctx->child;
struct aead_request *req;
req = container_of(areq, struct aead_request, base);
cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt);
}
static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
{
struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
struct crypto_aead *child = ctx->child;
struct aead_request *req;
req = container_of(areq, struct aead_request, base);
cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt);
}
static int cryptd_aead_enqueue(struct aead_request *req,
crypto_completion_t compl)
{
struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = compl;
return cryptd_enqueue_request(queue, &req->base);
}
static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
{
return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
}
static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
{
return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
}
static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
{
struct aead_instance *inst = aead_alg_instance(tfm);
struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
struct crypto_aead *cipher;
cipher = crypto_spawn_aead(spawn);
if (IS_ERR(cipher))
return PTR_ERR(cipher);
ctx->child = cipher;
crypto_aead_set_reqsize(
tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx),
crypto_aead_reqsize(cipher)));
return 0;
}
static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
{
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
crypto_free_aead(ctx->child);
}
static int cryptd_create_aead(struct crypto_template *tmpl,
struct rtattr **tb,
struct cryptd_queue *queue)
{
struct aead_instance_ctx *ctx;
struct aead_instance *inst;
struct aead_alg *alg;
const char *name;
u32 type = 0;
u32 mask = CRYPTO_ALG_ASYNC;
int err;
cryptd_check_internal(tb, &type, &mask);
name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(name))
return PTR_ERR(name);
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return -ENOMEM;
ctx = aead_instance_ctx(inst);
ctx->queue = queue;
crypto_set_aead_spawn(&ctx->aead_spawn, aead_crypto_instance(inst));
err = crypto_grab_aead(&ctx->aead_spawn, name, type, mask);
if (err)
goto out_free_inst;
alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
if (err)
goto out_drop_aead;
inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
(alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
inst->alg.init = cryptd_aead_init_tfm;
inst->alg.exit = cryptd_aead_exit_tfm;
inst->alg.setkey = cryptd_aead_setkey;
inst->alg.setauthsize = cryptd_aead_setauthsize;
inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
err = aead_register_instance(tmpl, inst);
if (err) {
out_drop_aead:
crypto_drop_aead(&ctx->aead_spawn);
out_free_inst:
kfree(inst);
}
return err;
}
static struct cryptd_queue queue;
static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_attr_type *algt;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_BLKCIPHER:
if ((algt->type & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_BLKCIPHER)
return cryptd_create_blkcipher(tmpl, tb, &queue);
return cryptd_create_skcipher(tmpl, tb, &queue);
case CRYPTO_ALG_TYPE_DIGEST:
return cryptd_create_hash(tmpl, tb, &queue);
case CRYPTO_ALG_TYPE_AEAD:
return cryptd_create_aead(tmpl, tb, &queue);
}
return -EINVAL;
}
static void cryptd_free(struct crypto_instance *inst)
{
struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_AHASH:
crypto_drop_shash(&hctx->spawn);
kfree(ahash_instance(inst));
return;
case CRYPTO_ALG_TYPE_AEAD:
crypto_drop_aead(&aead_ctx->aead_spawn);
kfree(aead_instance(inst));
return;
default:
crypto_drop_spawn(&ctx->spawn);
kfree(inst);
}
}
static struct crypto_template cryptd_tmpl = {
.name = "cryptd",
.create = cryptd_create,
.free = cryptd_free,
.module = THIS_MODULE,
};
struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
struct cryptd_blkcipher_ctx *ctx;
struct crypto_tfm *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
"cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-EINVAL);
type = crypto_skcipher_type(type);
mask &= ~CRYPTO_ALG_TYPE_MASK;
mask |= CRYPTO_ALG_TYPE_BLKCIPHER_MASK;
tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
if (tfm->__crt_alg->cra_module != THIS_MODULE) {
crypto_free_tfm(tfm);
return ERR_PTR(-EINVAL);
}
ctx = crypto_tfm_ctx(tfm);
atomic_set(&ctx->refcnt, 1);
return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
{
struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
bool cryptd_ablkcipher_queued(struct cryptd_ablkcipher *tfm)
{
struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
return atomic_read(&ctx->refcnt) - 1;
}
EXPORT_SYMBOL_GPL(cryptd_ablkcipher_queued);
void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
{
struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
if (atomic_dec_and_test(&ctx->refcnt))
crypto_free_ablkcipher(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name,
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
struct cryptd_skcipher_ctx *ctx;
struct crypto_skcipher *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
"cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-EINVAL);
tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
crypto_free_skcipher(tfm);
return ERR_PTR(-EINVAL);
}
ctx = crypto_skcipher_ctx(tfm);
atomic_set(&ctx->refcnt, 1);
return container_of(tfm, struct cryptd_skcipher, base);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher);
struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm)
{
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
return &ctx->child->base;
}
EXPORT_SYMBOL_GPL(cryptd_skcipher_child);
bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm)
{
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
return atomic_read(&ctx->refcnt) - 1;
}
EXPORT_SYMBOL_GPL(cryptd_skcipher_queued);
void cryptd_free_skcipher(struct cryptd_skcipher *tfm)
{
struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
if (atomic_dec_and_test(&ctx->refcnt))
crypto_free_skcipher(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_skcipher);
struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
struct cryptd_hash_ctx *ctx;
struct crypto_ahash *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
"cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-EINVAL);
tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
crypto_free_ahash(tfm);
return ERR_PTR(-EINVAL);
}
ctx = crypto_ahash_ctx(tfm);
atomic_set(&ctx->refcnt, 1);
return __cryptd_ahash_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
{
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_ahash_child);
struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
{
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
return &rctx->desc;
}
EXPORT_SYMBOL_GPL(cryptd_shash_desc);
bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
{
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
return atomic_read(&ctx->refcnt) - 1;
}
EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
void cryptd_free_ahash(struct cryptd_ahash *tfm)
{
struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
if (atomic_dec_and_test(&ctx->refcnt))
crypto_free_ahash(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ahash);
struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
struct cryptd_aead_ctx *ctx;
struct crypto_aead *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
"cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
return ERR_PTR(-EINVAL);
tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
if (IS_ERR(tfm))
return ERR_CAST(tfm);
if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
crypto_free_aead(tfm);
return ERR_PTR(-EINVAL);
}
ctx = crypto_aead_ctx(tfm);
atomic_set(&ctx->refcnt, 1);
return __cryptd_aead_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
{
struct cryptd_aead_ctx *ctx;
ctx = crypto_aead_ctx(&tfm->base);
return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_aead_child);
bool cryptd_aead_queued(struct cryptd_aead *tfm)
{
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
return atomic_read(&ctx->refcnt) - 1;
}
EXPORT_SYMBOL_GPL(cryptd_aead_queued);
void cryptd_free_aead(struct cryptd_aead *tfm)
{
struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
if (atomic_dec_and_test(&ctx->refcnt))
crypto_free_aead(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_aead);
static int __init cryptd_init(void)
{
int err;
err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
if (err)
return err;
err = crypto_register_template(&cryptd_tmpl);
if (err)
cryptd_fini_queue(&queue);
return err;
}
static void __exit cryptd_exit(void)
{
cryptd_fini_queue(&queue);
crypto_unregister_template(&cryptd_tmpl);
}
subsys_initcall(cryptd_init);
module_exit(cryptd_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Software async crypto daemon");
MODULE_ALIAS_CRYPTO("cryptd");