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);
83 ret = crypto_aead_encrypt(req);
85 if (ret == -EINPROGRESS)
89 padata_do_serial(padata);
92 static int pcrypt_aead_encrypt(struct aead_request *req)
95 struct pcrypt_request *preq = aead_request_ctx(req);
96 struct aead_request *creq = pcrypt_request_ctx(preq);
97 struct padata_priv *padata = pcrypt_request_padata(preq);
98 struct crypto_aead *aead = crypto_aead_reqtfm(req);
99 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
100 u32 flags = aead_request_flags(req);
101 struct pcrypt_instance_ctx *ictx;
103 ictx = pcrypt_tfm_ictx(aead);
105 memset(padata, 0, sizeof(struct padata_priv));
107 padata->parallel = pcrypt_aead_enc;
108 padata->serial = pcrypt_aead_serial;
110 aead_request_set_tfm(creq, ctx->child);
111 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
112 pcrypt_aead_done, req);
113 aead_request_set_crypt(creq, req->src, req->dst,
114 req->cryptlen, req->iv);
115 aead_request_set_ad(creq, req->assoclen);
117 err = padata_do_parallel(ictx->psenc, padata, &ctx->cb_cpu);
124 static void pcrypt_aead_dec(struct padata_priv *padata)
126 struct pcrypt_request *preq = pcrypt_padata_request(padata);
127 struct aead_request *req = pcrypt_request_ctx(preq);
130 ret = crypto_aead_decrypt(req);
132 if (ret == -EINPROGRESS)
136 padata_do_serial(padata);
139 static int pcrypt_aead_decrypt(struct aead_request *req)
142 struct pcrypt_request *preq = aead_request_ctx(req);
143 struct aead_request *creq = pcrypt_request_ctx(preq);
144 struct padata_priv *padata = pcrypt_request_padata(preq);
145 struct crypto_aead *aead = crypto_aead_reqtfm(req);
146 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
147 u32 flags = aead_request_flags(req);
148 struct pcrypt_instance_ctx *ictx;
150 ictx = pcrypt_tfm_ictx(aead);
152 memset(padata, 0, sizeof(struct padata_priv));
154 padata->parallel = pcrypt_aead_dec;
155 padata->serial = pcrypt_aead_serial;
157 aead_request_set_tfm(creq, ctx->child);
158 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
159 pcrypt_aead_done, req);
160 aead_request_set_crypt(creq, req->src, req->dst,
161 req->cryptlen, req->iv);
162 aead_request_set_ad(creq, req->assoclen);
164 err = padata_do_parallel(ictx->psdec, padata, &ctx->cb_cpu);
171 static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
174 struct aead_instance *inst = aead_alg_instance(tfm);
175 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
176 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
177 struct crypto_aead *cipher;
179 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
180 cpumask_weight(cpu_online_mask);
182 ctx->cb_cpu = cpumask_first(cpu_online_mask);
183 for (cpu = 0; cpu < cpu_index; cpu++)
184 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
186 cipher = crypto_spawn_aead(&ictx->spawn);
189 return PTR_ERR(cipher);
192 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
193 sizeof(struct aead_request) +
194 crypto_aead_reqsize(cipher));
199 static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
201 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
203 crypto_free_aead(ctx->child);
206 static void pcrypt_free(struct aead_instance *inst)
208 struct pcrypt_instance_ctx *ctx = aead_instance_ctx(inst);
210 crypto_drop_aead(&ctx->spawn);
211 padata_free_shell(ctx->psdec);
212 padata_free_shell(ctx->psenc);
216 static int pcrypt_init_instance(struct crypto_instance *inst,
217 struct crypto_alg *alg)
219 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
220 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
221 return -ENAMETOOLONG;
223 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
225 inst->alg.cra_priority = alg->cra_priority + 100;
226 inst->alg.cra_blocksize = alg->cra_blocksize;
227 inst->alg.cra_alignmask = alg->cra_alignmask;
232 static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
233 struct crypto_attr_type *algt)
235 struct pcrypt_instance_ctx *ctx;
236 struct aead_instance *inst;
237 struct aead_alg *alg;
238 u32 mask = crypto_algt_inherited_mask(algt);
241 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
247 ctx = aead_instance_ctx(inst);
248 ctx->psenc = padata_alloc_shell(pencrypt);
252 ctx->psdec = padata_alloc_shell(pdecrypt);
256 err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
257 crypto_attr_alg_name(tb[1]), 0, mask);
261 alg = crypto_spawn_aead_alg(&ctx->spawn);
262 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
266 inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC;
268 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
269 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
271 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
273 inst->alg.init = pcrypt_aead_init_tfm;
274 inst->alg.exit = pcrypt_aead_exit_tfm;
276 inst->alg.setkey = pcrypt_aead_setkey;
277 inst->alg.setauthsize = pcrypt_aead_setauthsize;
278 inst->alg.encrypt = pcrypt_aead_encrypt;
279 inst->alg.decrypt = pcrypt_aead_decrypt;
281 inst->free = pcrypt_free;
283 err = aead_register_instance(tmpl, inst);
291 static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
293 struct crypto_attr_type *algt;
295 algt = crypto_get_attr_type(tb);
297 return PTR_ERR(algt);
299 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
300 case CRYPTO_ALG_TYPE_AEAD:
301 return pcrypt_create_aead(tmpl, tb, algt);
307 static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
311 pinst->kobj.kset = pcrypt_kset;
312 ret = kobject_add(&pinst->kobj, NULL, "%s", name);
314 kobject_uevent(&pinst->kobj, KOBJ_ADD);
319 static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
323 *pinst = padata_alloc(name);
327 ret = pcrypt_sysfs_add(*pinst, name);
334 static struct crypto_template pcrypt_tmpl = {
336 .create = pcrypt_create,
337 .module = THIS_MODULE,
340 static int __init pcrypt_init(void)
344 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
348 err = pcrypt_init_padata(&pencrypt, "pencrypt");
352 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
354 goto err_deinit_pencrypt;
356 return crypto_register_template(&pcrypt_tmpl);
359 padata_free(pencrypt);
361 kset_unregister(pcrypt_kset);
366 static void __exit pcrypt_exit(void)
368 crypto_unregister_template(&pcrypt_tmpl);
370 padata_free(pencrypt);
371 padata_free(pdecrypt);
373 kset_unregister(pcrypt_kset);
376 subsys_initcall(pcrypt_init);
377 module_exit(pcrypt_exit);
379 MODULE_LICENSE("GPL");
380 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
381 MODULE_DESCRIPTION("Parallel crypto wrapper");
382 MODULE_ALIAS_CRYPTO("pcrypt");