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TOMOYO Linux Cross Reference
Linux/crypto/aead.c

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  1 /*
  2  * AEAD: Authenticated Encryption with Associated Data
  3  *
  4  * This file provides API support for AEAD algorithms.
  5  *
  6  * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the Free
 10  * Software Foundation; either version 2 of the License, or (at your option)
 11  * any later version.
 12  *
 13  */
 14 
 15 #include <crypto/internal/geniv.h>
 16 #include <crypto/internal/rng.h>
 17 #include <crypto/null.h>
 18 #include <crypto/scatterwalk.h>
 19 #include <linux/err.h>
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/rtnetlink.h>
 24 #include <linux/slab.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/cryptouser.h>
 27 #include <linux/compiler.h>
 28 #include <net/netlink.h>
 29 
 30 #include "internal.h"
 31 
 32 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 33                             unsigned int keylen)
 34 {
 35         unsigned long alignmask = crypto_aead_alignmask(tfm);
 36         int ret;
 37         u8 *buffer, *alignbuffer;
 38         unsigned long absize;
 39 
 40         absize = keylen + alignmask;
 41         buffer = kmalloc(absize, GFP_ATOMIC);
 42         if (!buffer)
 43                 return -ENOMEM;
 44 
 45         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 46         memcpy(alignbuffer, key, keylen);
 47         ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
 48         memset(alignbuffer, 0, keylen);
 49         kfree(buffer);
 50         return ret;
 51 }
 52 
 53 int crypto_aead_setkey(struct crypto_aead *tfm,
 54                        const u8 *key, unsigned int keylen)
 55 {
 56         unsigned long alignmask = crypto_aead_alignmask(tfm);
 57         int err;
 58 
 59         if ((unsigned long)key & alignmask)
 60                 err = setkey_unaligned(tfm, key, keylen);
 61         else
 62                 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
 63 
 64         if (err)
 65                 return err;
 66 
 67         crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 68         return 0;
 69 }
 70 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
 71 
 72 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 73 {
 74         int err;
 75 
 76         if (authsize > crypto_aead_maxauthsize(tfm))
 77                 return -EINVAL;
 78 
 79         if (crypto_aead_alg(tfm)->setauthsize) {
 80                 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
 81                 if (err)
 82                         return err;
 83         }
 84 
 85         tfm->authsize = authsize;
 86         return 0;
 87 }
 88 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
 89 
 90 static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
 91 {
 92         struct crypto_aead *aead = __crypto_aead_cast(tfm);
 93         struct aead_alg *alg = crypto_aead_alg(aead);
 94 
 95         alg->exit(aead);
 96 }
 97 
 98 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 99 {
100         struct crypto_aead *aead = __crypto_aead_cast(tfm);
101         struct aead_alg *alg = crypto_aead_alg(aead);
102 
103         crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
104 
105         aead->authsize = alg->maxauthsize;
106 
107         if (alg->exit)
108                 aead->base.exit = crypto_aead_exit_tfm;
109 
110         if (alg->init)
111                 return alg->init(aead);
112 
113         return 0;
114 }
115 
116 #ifdef CONFIG_NET
117 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
118 {
119         struct crypto_report_aead raead;
120         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
121 
122         strncpy(raead.type, "aead", sizeof(raead.type));
123         strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
124 
125         raead.blocksize = alg->cra_blocksize;
126         raead.maxauthsize = aead->maxauthsize;
127         raead.ivsize = aead->ivsize;
128 
129         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
130                     sizeof(struct crypto_report_aead), &raead))
131                 goto nla_put_failure;
132         return 0;
133 
134 nla_put_failure:
135         return -EMSGSIZE;
136 }
137 #else
138 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
139 {
140         return -ENOSYS;
141 }
142 #endif
143 
144 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
145         __maybe_unused;
146 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
147 {
148         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
149 
150         seq_printf(m, "type         : aead\n");
151         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
152                                              "yes" : "no");
153         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
154         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
155         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
156         seq_printf(m, "geniv        : <none>\n");
157 }
158 
159 static void crypto_aead_free_instance(struct crypto_instance *inst)
160 {
161         struct aead_instance *aead = aead_instance(inst);
162 
163         if (!aead->free) {
164                 inst->tmpl->free(inst);
165                 return;
166         }
167 
168         aead->free(aead);
169 }
170 
171 static const struct crypto_type crypto_aead_type = {
172         .extsize = crypto_alg_extsize,
173         .init_tfm = crypto_aead_init_tfm,
174         .free = crypto_aead_free_instance,
175 #ifdef CONFIG_PROC_FS
176         .show = crypto_aead_show,
177 #endif
178         .report = crypto_aead_report,
179         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
180         .maskset = CRYPTO_ALG_TYPE_MASK,
181         .type = CRYPTO_ALG_TYPE_AEAD,
182         .tfmsize = offsetof(struct crypto_aead, base),
183 };
184 
185 static int aead_geniv_setkey(struct crypto_aead *tfm,
186                              const u8 *key, unsigned int keylen)
187 {
188         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
189 
190         return crypto_aead_setkey(ctx->child, key, keylen);
191 }
192 
193 static int aead_geniv_setauthsize(struct crypto_aead *tfm,
194                                   unsigned int authsize)
195 {
196         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
197 
198         return crypto_aead_setauthsize(ctx->child, authsize);
199 }
200 
201 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
202                                        struct rtattr **tb, u32 type, u32 mask)
203 {
204         const char *name;
205         struct crypto_aead_spawn *spawn;
206         struct crypto_attr_type *algt;
207         struct aead_instance *inst;
208         struct aead_alg *alg;
209         unsigned int ivsize;
210         unsigned int maxauthsize;
211         int err;
212 
213         algt = crypto_get_attr_type(tb);
214         if (IS_ERR(algt))
215                 return ERR_CAST(algt);
216 
217         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
218                 return ERR_PTR(-EINVAL);
219 
220         name = crypto_attr_alg_name(tb[1]);
221         if (IS_ERR(name))
222                 return ERR_CAST(name);
223 
224         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
225         if (!inst)
226                 return ERR_PTR(-ENOMEM);
227 
228         spawn = aead_instance_ctx(inst);
229 
230         /* Ignore async algorithms if necessary. */
231         mask |= crypto_requires_sync(algt->type, algt->mask);
232 
233         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
234         err = crypto_grab_aead(spawn, name, type, mask);
235         if (err)
236                 goto err_free_inst;
237 
238         alg = crypto_spawn_aead_alg(spawn);
239 
240         ivsize = crypto_aead_alg_ivsize(alg);
241         maxauthsize = crypto_aead_alg_maxauthsize(alg);
242 
243         err = -EINVAL;
244         if (ivsize < sizeof(u64))
245                 goto err_drop_alg;
246 
247         err = -ENAMETOOLONG;
248         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
249                      "%s(%s)", tmpl->name, alg->base.cra_name) >=
250             CRYPTO_MAX_ALG_NAME)
251                 goto err_drop_alg;
252         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
253                      "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
254             CRYPTO_MAX_ALG_NAME)
255                 goto err_drop_alg;
256 
257         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
258         inst->alg.base.cra_priority = alg->base.cra_priority;
259         inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
260         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
261         inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
262 
263         inst->alg.setkey = aead_geniv_setkey;
264         inst->alg.setauthsize = aead_geniv_setauthsize;
265 
266         inst->alg.ivsize = ivsize;
267         inst->alg.maxauthsize = maxauthsize;
268 
269 out:
270         return inst;
271 
272 err_drop_alg:
273         crypto_drop_aead(spawn);
274 err_free_inst:
275         kfree(inst);
276         inst = ERR_PTR(err);
277         goto out;
278 }
279 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
280 
281 void aead_geniv_free(struct aead_instance *inst)
282 {
283         crypto_drop_aead(aead_instance_ctx(inst));
284         kfree(inst);
285 }
286 EXPORT_SYMBOL_GPL(aead_geniv_free);
287 
288 int aead_init_geniv(struct crypto_aead *aead)
289 {
290         struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
291         struct aead_instance *inst = aead_alg_instance(aead);
292         struct crypto_aead *child;
293         int err;
294 
295         spin_lock_init(&ctx->lock);
296 
297         err = crypto_get_default_rng();
298         if (err)
299                 goto out;
300 
301         err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
302                                    crypto_aead_ivsize(aead));
303         crypto_put_default_rng();
304         if (err)
305                 goto out;
306 
307         ctx->sknull = crypto_get_default_null_skcipher();
308         err = PTR_ERR(ctx->sknull);
309         if (IS_ERR(ctx->sknull))
310                 goto out;
311 
312         child = crypto_spawn_aead(aead_instance_ctx(inst));
313         err = PTR_ERR(child);
314         if (IS_ERR(child))
315                 goto drop_null;
316 
317         ctx->child = child;
318         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
319                                       sizeof(struct aead_request));
320 
321         err = 0;
322 
323 out:
324         return err;
325 
326 drop_null:
327         crypto_put_default_null_skcipher();
328         goto out;
329 }
330 EXPORT_SYMBOL_GPL(aead_init_geniv);
331 
332 void aead_exit_geniv(struct crypto_aead *tfm)
333 {
334         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
335 
336         crypto_free_aead(ctx->child);
337         crypto_put_default_null_skcipher();
338 }
339 EXPORT_SYMBOL_GPL(aead_exit_geniv);
340 
341 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
342                      u32 type, u32 mask)
343 {
344         spawn->base.frontend = &crypto_aead_type;
345         return crypto_grab_spawn(&spawn->base, name, type, mask);
346 }
347 EXPORT_SYMBOL_GPL(crypto_grab_aead);
348 
349 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
350 {
351         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
352 }
353 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
354 
355 static int aead_prepare_alg(struct aead_alg *alg)
356 {
357         struct crypto_alg *base = &alg->base;
358 
359         if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
360             PAGE_SIZE / 8)
361                 return -EINVAL;
362 
363         if (!alg->chunksize)
364                 alg->chunksize = base->cra_blocksize;
365 
366         base->cra_type = &crypto_aead_type;
367         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
368         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
369 
370         return 0;
371 }
372 
373 int crypto_register_aead(struct aead_alg *alg)
374 {
375         struct crypto_alg *base = &alg->base;
376         int err;
377 
378         err = aead_prepare_alg(alg);
379         if (err)
380                 return err;
381 
382         return crypto_register_alg(base);
383 }
384 EXPORT_SYMBOL_GPL(crypto_register_aead);
385 
386 void crypto_unregister_aead(struct aead_alg *alg)
387 {
388         crypto_unregister_alg(&alg->base);
389 }
390 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
391 
392 int crypto_register_aeads(struct aead_alg *algs, int count)
393 {
394         int i, ret;
395 
396         for (i = 0; i < count; i++) {
397                 ret = crypto_register_aead(&algs[i]);
398                 if (ret)
399                         goto err;
400         }
401 
402         return 0;
403 
404 err:
405         for (--i; i >= 0; --i)
406                 crypto_unregister_aead(&algs[i]);
407 
408         return ret;
409 }
410 EXPORT_SYMBOL_GPL(crypto_register_aeads);
411 
412 void crypto_unregister_aeads(struct aead_alg *algs, int count)
413 {
414         int i;
415 
416         for (i = count - 1; i >= 0; --i)
417                 crypto_unregister_aead(&algs[i]);
418 }
419 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
420 
421 int aead_register_instance(struct crypto_template *tmpl,
422                            struct aead_instance *inst)
423 {
424         int err;
425 
426         err = aead_prepare_alg(&inst->alg);
427         if (err)
428                 return err;
429 
430         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
431 }
432 EXPORT_SYMBOL_GPL(aead_register_instance);
433 
434 MODULE_LICENSE("GPL");
435 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
436 

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