Release 4.11 crypto/cryptd.c

Directory: crypto
/*
 * 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>


#define CRYPTD_MAX_CPU_QLEN 1000


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_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);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Huang Ying 84 100.00% 1 100.00%
Total 84 100.00% 1 100.00%



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);
}

Contributors
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Huang Ying 52 100.00% 1 100.00%
Total 52 100.00% 1 100.00%



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;
	bool may_backlog;

	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);
	may_backlog = request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG;

	if (err == -EBUSY && !may_backlog)
		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;
}

Contributors
Person Tokens Prop Commits CommitProp
Huang Ying 69 55.20% 1 33.33%
Herbert Xu 55 44.00% 1 33.33%
Christoph Lameter 1 0.80% 1 33.33%
Total 125 100.00% 3 100.00%

/* 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Huang Ying 109 93.97% 1 50.00%
Jussi Kivilinna 7 6.03% 1 50.00%
Total 116 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 36 92.31% 1 50.00%
Huang Ying 3 7.69% 1 50.00%
Total 39 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Stephan Mueller 54 91.53% 1 50.00%
Herbert Xu 5 8.47% 1 50.00%
Total 59 100.00% 2 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 87 100.00% 1 100.00%
Total 87 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 203 100.00% 3 100.00%
Total 203 100.00% 3 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 65 83.33% 2 50.00%
Huang Ying 11 14.10% 1 25.00%
Mark D Rustad 2 2.56% 1 25.00%
Total 78 100.00% 4 100.00%



static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
{
	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
{
	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 97 100.00% 1 100.00%
Total 97 100.00% 1 100.00%



static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
{
	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_blkcipher(ctx->child);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 91 100.00% 1 100.00%
Total 91 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 104 93.69% 4 80.00%
Julia Lawall 7 6.31% 1 20.00%
Total 111 100.00% 5 100.00%



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_ablkcipher.geniv = alg->cra_blkcipher.geniv;

	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;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 293 85.17% 5 62.50%
Stephan Mueller 42 12.21% 1 12.50%
Steffen Klassert 7 2.03% 1 12.50%
Huang Ying 2 0.58% 1 12.50%
Total 344 100.00% 8 100.00%



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_skcipher *child = ctx->child;
	int err;

	crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
					 CRYPTO_TFM_REQ_MASK);
	err = crypto_skcipher_setkey(child, key, keylen);
	crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
					  CRYPTO_TFM_RES_MASK);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Loc Ho 75 86.21% 1 33.33%
Herbert Xu 12 13.79% 2 66.67%
Total 87 100.00% 3 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 63 66.32% 1 50.00%
Loc Ho 32 33.68% 1 50.00%
Total 95 100.00% 2 100.00%



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_skcipher *child = ctx->child;
	SKCIPHER_REQUEST_ON_STACK(subreq, child);

	if (unlikely(err == -EINPROGRESS))
		goto out;

	skcipher_request_set_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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 153 100.00% 1 100.00%
Total 153 100.00% 1 100.00%



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_skcipher *child = ctx->child;
	SKCIPHER_REQUEST_ON_STACK(subreq, child);

	if (unlikely(err == -EINPROGRESS))
		goto out;

	skcipher_request_set_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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 153 100.00% 1 100.00%
Total 153 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 78 100.00% 1 100.00%
Total 78 100.00% 1 100.00%



static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req)
{
	return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req)
{
	return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



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 = cipher;
	crypto_skcipher_set_reqsize(
		tfm, sizeof(struct cryptd_skcipher_request_ctx));
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 96 100.00% 1 100.00%
Total 96 100.00% 1 100.00%



static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm)
{
	struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);

	crypto_free_skcipher(ctx->child);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



static void cryptd_skcipher_free(struct skcipher_instance *inst)
{
	struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst);

	crypto_drop_skcipher(&ctx->spawn);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%



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
Person	Tokens	Prop	Commits	CommitProp
Huang Ying	84	100.00%	1	100.00%
Total	84	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 crypto/cryptd.c

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