1 // SPDX-License-Identifier: GPL-2.0-only
3 * pcrypt - Parallel crypto wrapper.
5 * Copyright (C) 2009 secunet Security Networks AG
6 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
9 #include <crypto/algapi.h>
10 #include <crypto/internal/aead.h>
11 #include <linux/atomic.h>
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/kobject.h>
17 #include <linux/cpu.h>
18 #include <crypto/pcrypt.h>
20 static struct padata_instance *pencrypt;
21 static struct padata_instance *pdecrypt;
22 static struct kset *pcrypt_kset;
24 struct pcrypt_instance_ctx {
25 struct crypto_aead_spawn spawn;
26 struct padata_shell *psenc;
27 struct padata_shell *psdec;
31 struct pcrypt_aead_ctx {
32 struct crypto_aead *child;
36 static inline struct pcrypt_instance_ctx *pcrypt_tfm_ictx(
37 struct crypto_aead *tfm)
39 return aead_instance_ctx(aead_alg_instance(tfm));
42 static int pcrypt_aead_setkey(struct crypto_aead *parent,
43 const u8 *key, unsigned int keylen)
45 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
47 return crypto_aead_setkey(ctx->child, key, keylen);
50 static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
51 unsigned int authsize)
53 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
55 return crypto_aead_setauthsize(ctx->child, authsize);
58 static void pcrypt_aead_serial(struct padata_priv *padata)
60 struct pcrypt_request *preq = pcrypt_padata_request(padata);
61 struct aead_request *req = pcrypt_request_ctx(preq);
63 aead_request_complete(req->base.data, padata->info);
66 static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
68 struct aead_request *req = areq->data;
69 struct pcrypt_request *preq = aead_request_ctx(req);
70 struct padata_priv *padata = pcrypt_request_padata(preq);
74 padata_do_serial(padata);
77 static void pcrypt_aead_enc(struct padata_priv *padata)
79 struct pcrypt_request *preq = pcrypt_padata_request(padata);
80 struct aead_request *req = pcrypt_request_ctx(preq);
82 padata->info = crypto_aead_encrypt(req);
84 if (padata->info == -EINPROGRESS)
87 padata_do_serial(padata);
90 static int pcrypt_aead_encrypt(struct aead_request *req)
93 struct pcrypt_request *preq = aead_request_ctx(req);
94 struct aead_request *creq = pcrypt_request_ctx(preq);
95 struct padata_priv *padata = pcrypt_request_padata(preq);
96 struct crypto_aead *aead = crypto_aead_reqtfm(req);
97 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
98 u32 flags = aead_request_flags(req);
99 struct pcrypt_instance_ctx *ictx;
101 ictx = pcrypt_tfm_ictx(aead);
103 memset(padata, 0, sizeof(struct padata_priv));
105 padata->parallel = pcrypt_aead_enc;
106 padata->serial = pcrypt_aead_serial;
108 aead_request_set_tfm(creq, ctx->child);
109 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
110 pcrypt_aead_done, req);
111 aead_request_set_crypt(creq, req->src, req->dst,
112 req->cryptlen, req->iv);
113 aead_request_set_ad(creq, req->assoclen);
115 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
122 static void pcrypt_aead_dec(struct padata_priv *padata)
124 struct pcrypt_request *preq = pcrypt_padata_request(padata);
125 struct aead_request *req = pcrypt_request_ctx(preq);
127 padata->info = crypto_aead_decrypt(req);
129 if (padata->info == -EINPROGRESS)
132 padata_do_serial(padata);
135 static int pcrypt_aead_decrypt(struct aead_request *req)
138 struct pcrypt_request *preq = aead_request_ctx(req);
139 struct aead_request *creq = pcrypt_request_ctx(preq);
140 struct padata_priv *padata = pcrypt_request_padata(preq);
141 struct crypto_aead *aead = crypto_aead_reqtfm(req);
142 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
143 u32 flags = aead_request_flags(req);
144 struct pcrypt_instance_ctx *ictx;
146 ictx = pcrypt_tfm_ictx(aead);
148 memset(padata, 0, sizeof(struct padata_priv));
150 padata->parallel = pcrypt_aead_dec;
151 padata->serial = pcrypt_aead_serial;
153 aead_request_set_tfm(creq, ctx->child);
154 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
155 pcrypt_aead_done, req);
156 aead_request_set_crypt(creq, req->src, req->dst,
157 req->cryptlen, req->iv);
158 aead_request_set_ad(creq, req->assoclen);
160 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
167 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
170 struct aead_instance *inst = aead_alg_instance(tfm);
171 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
172 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
173 struct crypto_aead *cipher;
175 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
176 cpumask_weight(cpu_online_mask);
178 ctx->cb_cpu = cpumask_first(cpu_online_mask);
179 for (cpu = 0; cpu < cpu_index; cpu++)
180 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
182 cipher = crypto_spawn_aead(&ictx->spawn);
185 return PTR_ERR(cipher);
188 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
189 sizeof(struct aead_request) +
190 crypto_aead_reqsize(cipher));
195 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
197 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
199 crypto_free_aead(ctx->child);
202 static void pcrypt_free(struct aead_instance *inst)
204 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
206 crypto_drop_aead(&ctx->spawn);
207 padata_free_shell(ctx->psdec);
208 padata_free_shell(ctx->psenc);
212 static int pcrypt_init_instance(struct crypto_instance *inst,
213 struct crypto_alg *alg)
215 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
216 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
217 return -ENAMETOOLONG;
219 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
221 inst->alg.cra_priority = alg->cra_priority + 100;
222 inst->alg.cra_blocksize = alg->cra_blocksize;
223 inst->alg.cra_alignmask = alg->cra_alignmask;
228 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
229 struct crypto_attr_type *algt)
231 struct pcrypt_instance_ctx *ctx;
232 struct aead_instance *inst;
233 struct aead_alg *alg;
234 u32 mask = crypto_algt_inherited_mask(algt);
237 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
243 ctx = aead_instance_ctx(inst);
244 ctx->psenc = padata_alloc_shell(pencrypt);
248 ctx->psdec = padata_alloc_shell(pdecrypt);
252 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
253 crypto_attr_alg_name(tb[1]), 0, mask);
257 alg = crypto_spawn_aead_alg(&ctx->spawn);
258 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
262 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
264 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
265 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
267 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
269 inst->alg.init = pcrypt_aead_init_tfm;
270 inst->alg.exit = pcrypt_aead_exit_tfm;
272 inst->alg.setkey = pcrypt_aead_setkey;
273 inst->alg.setauthsize = pcrypt_aead_setauthsize;
274 inst->alg.encrypt = pcrypt_aead_encrypt;
275 inst->alg.decrypt = pcrypt_aead_decrypt;
277 inst->free = pcrypt_free;
279 err = aead_register_instance(tmpl, inst);
287 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
289 struct crypto_attr_type *algt;
291 algt = crypto_get_attr_type(tb);
293 return PTR_ERR(algt);
295 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
296 case CRYPTO_ALG_TYPE_AEAD:
297 return pcrypt_create_aead(tmpl, tb, algt);
303 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
307 pinst->kobj.kset = pcrypt_kset;
308 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
310 kobject_uevent(&pinst->kobj, KOBJ_ADD);
315 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
319 *pinst = padata_alloc(name);
323 ret = pcrypt_sysfs_add(*pinst, name);
330 static struct crypto_template pcrypt_tmpl = {
332 .create = pcrypt_create,
333 .module = THIS_MODULE,
336 static int __init pcrypt_init(void)
340 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
344 err = pcrypt_init_padata(&pencrypt, "pencrypt");
348 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
350 goto err_deinit_pencrypt;
352 return crypto_register_template(&pcrypt_tmpl);
355 padata_free(pencrypt);
357 kset_unregister(pcrypt_kset);
362 static void __exit pcrypt_exit(void)
364 crypto_unregister_template(&pcrypt_tmpl);
366 padata_free(pencrypt);
367 padata_free(pdecrypt);
369 kset_unregister(pcrypt_kset);
372 subsys_initcall(pcrypt_init);
373 module_exit(pcrypt_exit);
375 MODULE_LICENSE("GPL");
376 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
377 MODULE_DESCRIPTION("Parallel crypto wrapper");
378 MODULE_ALIAS_CRYPTO("pcrypt");