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TOMOYO Linux Cross Reference
Linux/crypto/aead.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * AEAD: Authenticated Encryption with Associated Data
  4  *
  5  * This file provides API support for AEAD algorithms.
  6  *
  7  * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
  8  */
  9 
 10 #include <crypto/internal/geniv.h>
 11 #include <crypto/internal/rng.h>
 12 #include <crypto/null.h>
 13 #include <crypto/scatterwalk.h>
 14 #include <linux/err.h>
 15 #include <linux/init.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/rtnetlink.h>
 19 #include <linux/slab.h>
 20 #include <linux/seq_file.h>
 21 #include <linux/cryptouser.h>
 22 #include <linux/compiler.h>
 23 #include <net/netlink.h>
 24 
 25 #include "internal.h"
 26 
 27 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 28                             unsigned int keylen)
 29 {
 30         unsigned long alignmask = crypto_aead_alignmask(tfm);
 31         int ret;
 32         u8 *buffer, *alignbuffer;
 33         unsigned long absize;
 34 
 35         absize = keylen + alignmask;
 36         buffer = kmalloc(absize, GFP_ATOMIC);
 37         if (!buffer)
 38                 return -ENOMEM;
 39 
 40         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 41         memcpy(alignbuffer, key, keylen);
 42         ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
 43         memset(alignbuffer, 0, keylen);
 44         kfree(buffer);
 45         return ret;
 46 }
 47 
 48 int crypto_aead_setkey(struct crypto_aead *tfm,
 49                        const u8 *key, unsigned int keylen)
 50 {
 51         unsigned long alignmask = crypto_aead_alignmask(tfm);
 52         int err;
 53 
 54         if ((unsigned long)key & alignmask)
 55                 err = setkey_unaligned(tfm, key, keylen);
 56         else
 57                 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
 58 
 59         if (unlikely(err)) {
 60                 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
 61                 return err;
 62         }
 63 
 64         crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 65         return 0;
 66 }
 67 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
 68 
 69 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 70 {
 71         int err;
 72 
 73         if (authsize > crypto_aead_maxauthsize(tfm))
 74                 return -EINVAL;
 75 
 76         if (crypto_aead_alg(tfm)->setauthsize) {
 77                 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
 78                 if (err)
 79                         return err;
 80         }
 81 
 82         tfm->authsize = authsize;
 83         return 0;
 84 }
 85 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
 86 
 87 int crypto_aead_encrypt(struct aead_request *req)
 88 {
 89         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 90         struct crypto_alg *alg = aead->base.__crt_alg;
 91         unsigned int cryptlen = req->cryptlen;
 92         int ret;
 93 
 94         crypto_stats_get(alg);
 95         if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
 96                 ret = -ENOKEY;
 97         else
 98                 ret = crypto_aead_alg(aead)->encrypt(req);
 99         crypto_stats_aead_encrypt(cryptlen, alg, ret);
100         return ret;
101 }
102 EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
103 
104 int crypto_aead_decrypt(struct aead_request *req)
105 {
106         struct crypto_aead *aead = crypto_aead_reqtfm(req);
107         struct crypto_alg *alg = aead->base.__crt_alg;
108         unsigned int cryptlen = req->cryptlen;
109         int ret;
110 
111         crypto_stats_get(alg);
112         if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
113                 ret = -ENOKEY;
114         else if (req->cryptlen < crypto_aead_authsize(aead))
115                 ret = -EINVAL;
116         else
117                 ret = crypto_aead_alg(aead)->decrypt(req);
118         crypto_stats_aead_decrypt(cryptlen, alg, ret);
119         return ret;
120 }
121 EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
122 
123 static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
124 {
125         struct crypto_aead *aead = __crypto_aead_cast(tfm);
126         struct aead_alg *alg = crypto_aead_alg(aead);
127 
128         alg->exit(aead);
129 }
130 
131 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
132 {
133         struct crypto_aead *aead = __crypto_aead_cast(tfm);
134         struct aead_alg *alg = crypto_aead_alg(aead);
135 
136         crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
137 
138         aead->authsize = alg->maxauthsize;
139 
140         if (alg->exit)
141                 aead->base.exit = crypto_aead_exit_tfm;
142 
143         if (alg->init)
144                 return alg->init(aead);
145 
146         return 0;
147 }
148 
149 #ifdef CONFIG_NET
150 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
151 {
152         struct crypto_report_aead raead;
153         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
154 
155         memset(&raead, 0, sizeof(raead));
156 
157         strscpy(raead.type, "aead", sizeof(raead.type));
158         strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
159 
160         raead.blocksize = alg->cra_blocksize;
161         raead.maxauthsize = aead->maxauthsize;
162         raead.ivsize = aead->ivsize;
163 
164         return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
165 }
166 #else
167 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
168 {
169         return -ENOSYS;
170 }
171 #endif
172 
173 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
174         __maybe_unused;
175 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
176 {
177         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
178 
179         seq_printf(m, "type         : aead\n");
180         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
181                                              "yes" : "no");
182         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
183         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
184         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
185         seq_printf(m, "geniv        : <none>\n");
186 }
187 
188 static void crypto_aead_free_instance(struct crypto_instance *inst)
189 {
190         struct aead_instance *aead = aead_instance(inst);
191 
192         if (!aead->free) {
193                 inst->tmpl->free(inst);
194                 return;
195         }
196 
197         aead->free(aead);
198 }
199 
200 static const struct crypto_type crypto_aead_type = {
201         .extsize = crypto_alg_extsize,
202         .init_tfm = crypto_aead_init_tfm,
203         .free = crypto_aead_free_instance,
204 #ifdef CONFIG_PROC_FS
205         .show = crypto_aead_show,
206 #endif
207         .report = crypto_aead_report,
208         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
209         .maskset = CRYPTO_ALG_TYPE_MASK,
210         .type = CRYPTO_ALG_TYPE_AEAD,
211         .tfmsize = offsetof(struct crypto_aead, base),
212 };
213 
214 static int aead_geniv_setkey(struct crypto_aead *tfm,
215                              const u8 *key, unsigned int keylen)
216 {
217         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
218 
219         return crypto_aead_setkey(ctx->child, key, keylen);
220 }
221 
222 static int aead_geniv_setauthsize(struct crypto_aead *tfm,
223                                   unsigned int authsize)
224 {
225         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
226 
227         return crypto_aead_setauthsize(ctx->child, authsize);
228 }
229 
230 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
231                                        struct rtattr **tb, u32 type, u32 mask)
232 {
233         const char *name;
234         struct crypto_aead_spawn *spawn;
235         struct crypto_attr_type *algt;
236         struct aead_instance *inst;
237         struct aead_alg *alg;
238         unsigned int ivsize;
239         unsigned int maxauthsize;
240         int err;
241 
242         algt = crypto_get_attr_type(tb);
243         if (IS_ERR(algt))
244                 return ERR_CAST(algt);
245 
246         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
247                 return ERR_PTR(-EINVAL);
248 
249         name = crypto_attr_alg_name(tb[1]);
250         if (IS_ERR(name))
251                 return ERR_CAST(name);
252 
253         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
254         if (!inst)
255                 return ERR_PTR(-ENOMEM);
256 
257         spawn = aead_instance_ctx(inst);
258 
259         /* Ignore async algorithms if necessary. */
260         mask |= crypto_requires_sync(algt->type, algt->mask);
261 
262         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
263         err = crypto_grab_aead(spawn, name, type, mask);
264         if (err)
265                 goto err_free_inst;
266 
267         alg = crypto_spawn_aead_alg(spawn);
268 
269         ivsize = crypto_aead_alg_ivsize(alg);
270         maxauthsize = crypto_aead_alg_maxauthsize(alg);
271 
272         err = -EINVAL;
273         if (ivsize < sizeof(u64))
274                 goto err_drop_alg;
275 
276         err = -ENAMETOOLONG;
277         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
278                      "%s(%s)", tmpl->name, alg->base.cra_name) >=
279             CRYPTO_MAX_ALG_NAME)
280                 goto err_drop_alg;
281         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
282                      "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
283             CRYPTO_MAX_ALG_NAME)
284                 goto err_drop_alg;
285 
286         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
287         inst->alg.base.cra_priority = alg->base.cra_priority;
288         inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
289         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
290         inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
291 
292         inst->alg.setkey = aead_geniv_setkey;
293         inst->alg.setauthsize = aead_geniv_setauthsize;
294 
295         inst->alg.ivsize = ivsize;
296         inst->alg.maxauthsize = maxauthsize;
297 
298 out:
299         return inst;
300 
301 err_drop_alg:
302         crypto_drop_aead(spawn);
303 err_free_inst:
304         kfree(inst);
305         inst = ERR_PTR(err);
306         goto out;
307 }
308 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
309 
310 void aead_geniv_free(struct aead_instance *inst)
311 {
312         crypto_drop_aead(aead_instance_ctx(inst));
313         kfree(inst);
314 }
315 EXPORT_SYMBOL_GPL(aead_geniv_free);
316 
317 int aead_init_geniv(struct crypto_aead *aead)
318 {
319         struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
320         struct aead_instance *inst = aead_alg_instance(aead);
321         struct crypto_aead *child;
322         int err;
323 
324         spin_lock_init(&ctx->lock);
325 
326         err = crypto_get_default_rng();
327         if (err)
328                 goto out;
329 
330         err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
331                                    crypto_aead_ivsize(aead));
332         crypto_put_default_rng();
333         if (err)
334                 goto out;
335 
336         ctx->sknull = crypto_get_default_null_skcipher();
337         err = PTR_ERR(ctx->sknull);
338         if (IS_ERR(ctx->sknull))
339                 goto out;
340 
341         child = crypto_spawn_aead(aead_instance_ctx(inst));
342         err = PTR_ERR(child);
343         if (IS_ERR(child))
344                 goto drop_null;
345 
346         ctx->child = child;
347         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
348                                       sizeof(struct aead_request));
349 
350         err = 0;
351 
352 out:
353         return err;
354 
355 drop_null:
356         crypto_put_default_null_skcipher();
357         goto out;
358 }
359 EXPORT_SYMBOL_GPL(aead_init_geniv);
360 
361 void aead_exit_geniv(struct crypto_aead *tfm)
362 {
363         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
364 
365         crypto_free_aead(ctx->child);
366         crypto_put_default_null_skcipher();
367 }
368 EXPORT_SYMBOL_GPL(aead_exit_geniv);
369 
370 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
371                      u32 type, u32 mask)
372 {
373         spawn->base.frontend = &crypto_aead_type;
374         return crypto_grab_spawn(&spawn->base, name, type, mask);
375 }
376 EXPORT_SYMBOL_GPL(crypto_grab_aead);
377 
378 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
379 {
380         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
381 }
382 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
383 
384 static int aead_prepare_alg(struct aead_alg *alg)
385 {
386         struct crypto_alg *base = &alg->base;
387 
388         if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
389             PAGE_SIZE / 8)
390                 return -EINVAL;
391 
392         if (!alg->chunksize)
393                 alg->chunksize = base->cra_blocksize;
394 
395         base->cra_type = &crypto_aead_type;
396         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
397         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
398 
399         return 0;
400 }
401 
402 int crypto_register_aead(struct aead_alg *alg)
403 {
404         struct crypto_alg *base = &alg->base;
405         int err;
406 
407         err = aead_prepare_alg(alg);
408         if (err)
409                 return err;
410 
411         return crypto_register_alg(base);
412 }
413 EXPORT_SYMBOL_GPL(crypto_register_aead);
414 
415 void crypto_unregister_aead(struct aead_alg *alg)
416 {
417         crypto_unregister_alg(&alg->base);
418 }
419 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
420 
421 int crypto_register_aeads(struct aead_alg *algs, int count)
422 {
423         int i, ret;
424 
425         for (i = 0; i < count; i++) {
426                 ret = crypto_register_aead(&algs[i]);
427                 if (ret)
428                         goto err;
429         }
430 
431         return 0;
432 
433 err:
434         for (--i; i >= 0; --i)
435                 crypto_unregister_aead(&algs[i]);
436 
437         return ret;
438 }
439 EXPORT_SYMBOL_GPL(crypto_register_aeads);
440 
441 void crypto_unregister_aeads(struct aead_alg *algs, int count)
442 {
443         int i;
444 
445         for (i = count - 1; i >= 0; --i)
446                 crypto_unregister_aead(&algs[i]);
447 }
448 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
449 
450 int aead_register_instance(struct crypto_template *tmpl,
451                            struct aead_instance *inst)
452 {
453         int err;
454 
455         err = aead_prepare_alg(&inst->alg);
456         if (err)
457                 return err;
458 
459         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
460 }
461 EXPORT_SYMBOL_GPL(aead_register_instance);
462 
463 MODULE_LICENSE("GPL");
464 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
465 

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