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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 
 58         if ((unsigned long)key & alignmask)
 59                 return setkey_unaligned(tfm, key, keylen);
 60 
 61         return crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
 62 }
 63 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
 64 
 65 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 66 {
 67         int err;
 68 
 69         if (authsize > crypto_aead_maxauthsize(tfm))
 70                 return -EINVAL;
 71 
 72         if (crypto_aead_alg(tfm)->setauthsize) {
 73                 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
 74                 if (err)
 75                         return err;
 76         }
 77 
 78         tfm->authsize = authsize;
 79         return 0;
 80 }
 81 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
 82 
 83 static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
 84 {
 85         struct crypto_aead *aead = __crypto_aead_cast(tfm);
 86         struct aead_alg *alg = crypto_aead_alg(aead);
 87 
 88         alg->exit(aead);
 89 }
 90 
 91 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 92 {
 93         struct crypto_aead *aead = __crypto_aead_cast(tfm);
 94         struct aead_alg *alg = crypto_aead_alg(aead);
 95 
 96         aead->authsize = alg->maxauthsize;
 97 
 98         if (alg->exit)
 99                 aead->base.exit = crypto_aead_exit_tfm;
100 
101         if (alg->init)
102                 return alg->init(aead);
103 
104         return 0;
105 }
106 
107 #ifdef CONFIG_NET
108 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
109 {
110         struct crypto_report_aead raead;
111         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
112 
113         strncpy(raead.type, "aead", sizeof(raead.type));
114         strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
115 
116         raead.blocksize = alg->cra_blocksize;
117         raead.maxauthsize = aead->maxauthsize;
118         raead.ivsize = aead->ivsize;
119 
120         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
121                     sizeof(struct crypto_report_aead), &raead))
122                 goto nla_put_failure;
123         return 0;
124 
125 nla_put_failure:
126         return -EMSGSIZE;
127 }
128 #else
129 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
130 {
131         return -ENOSYS;
132 }
133 #endif
134 
135 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
136         __maybe_unused;
137 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
138 {
139         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
140 
141         seq_printf(m, "type         : aead\n");
142         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
143                                              "yes" : "no");
144         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
145         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
146         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
147         seq_printf(m, "geniv        : <none>\n");
148 }
149 
150 static void crypto_aead_free_instance(struct crypto_instance *inst)
151 {
152         struct aead_instance *aead = aead_instance(inst);
153 
154         if (!aead->free) {
155                 inst->tmpl->free(inst);
156                 return;
157         }
158 
159         aead->free(aead);
160 }
161 
162 static const struct crypto_type crypto_aead_type = {
163         .extsize = crypto_alg_extsize,
164         .init_tfm = crypto_aead_init_tfm,
165         .free = crypto_aead_free_instance,
166 #ifdef CONFIG_PROC_FS
167         .show = crypto_aead_show,
168 #endif
169         .report = crypto_aead_report,
170         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
171         .maskset = CRYPTO_ALG_TYPE_MASK,
172         .type = CRYPTO_ALG_TYPE_AEAD,
173         .tfmsize = offsetof(struct crypto_aead, base),
174 };
175 
176 static int aead_geniv_setkey(struct crypto_aead *tfm,
177                              const u8 *key, unsigned int keylen)
178 {
179         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
180 
181         return crypto_aead_setkey(ctx->child, key, keylen);
182 }
183 
184 static int aead_geniv_setauthsize(struct crypto_aead *tfm,
185                                   unsigned int authsize)
186 {
187         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
188 
189         return crypto_aead_setauthsize(ctx->child, authsize);
190 }
191 
192 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
193                                        struct rtattr **tb, u32 type, u32 mask)
194 {
195         const char *name;
196         struct crypto_aead_spawn *spawn;
197         struct crypto_attr_type *algt;
198         struct aead_instance *inst;
199         struct aead_alg *alg;
200         unsigned int ivsize;
201         unsigned int maxauthsize;
202         int err;
203 
204         algt = crypto_get_attr_type(tb);
205         if (IS_ERR(algt))
206                 return ERR_CAST(algt);
207 
208         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
209                 return ERR_PTR(-EINVAL);
210 
211         name = crypto_attr_alg_name(tb[1]);
212         if (IS_ERR(name))
213                 return ERR_CAST(name);
214 
215         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
216         if (!inst)
217                 return ERR_PTR(-ENOMEM);
218 
219         spawn = aead_instance_ctx(inst);
220 
221         /* Ignore async algorithms if necessary. */
222         mask |= crypto_requires_sync(algt->type, algt->mask);
223 
224         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
225         err = crypto_grab_aead(spawn, name, type, mask);
226         if (err)
227                 goto err_free_inst;
228 
229         alg = crypto_spawn_aead_alg(spawn);
230 
231         ivsize = crypto_aead_alg_ivsize(alg);
232         maxauthsize = crypto_aead_alg_maxauthsize(alg);
233 
234         err = -EINVAL;
235         if (ivsize < sizeof(u64))
236                 goto err_drop_alg;
237 
238         err = -ENAMETOOLONG;
239         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
240                      "%s(%s)", tmpl->name, alg->base.cra_name) >=
241             CRYPTO_MAX_ALG_NAME)
242                 goto err_drop_alg;
243         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
244                      "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
245             CRYPTO_MAX_ALG_NAME)
246                 goto err_drop_alg;
247 
248         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
249         inst->alg.base.cra_priority = alg->base.cra_priority;
250         inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
251         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
252         inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
253 
254         inst->alg.setkey = aead_geniv_setkey;
255         inst->alg.setauthsize = aead_geniv_setauthsize;
256 
257         inst->alg.ivsize = ivsize;
258         inst->alg.maxauthsize = maxauthsize;
259 
260 out:
261         return inst;
262 
263 err_drop_alg:
264         crypto_drop_aead(spawn);
265 err_free_inst:
266         kfree(inst);
267         inst = ERR_PTR(err);
268         goto out;
269 }
270 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
271 
272 void aead_geniv_free(struct aead_instance *inst)
273 {
274         crypto_drop_aead(aead_instance_ctx(inst));
275         kfree(inst);
276 }
277 EXPORT_SYMBOL_GPL(aead_geniv_free);
278 
279 int aead_init_geniv(struct crypto_aead *aead)
280 {
281         struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
282         struct aead_instance *inst = aead_alg_instance(aead);
283         struct crypto_aead *child;
284         int err;
285 
286         spin_lock_init(&ctx->lock);
287 
288         err = crypto_get_default_rng();
289         if (err)
290                 goto out;
291 
292         err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
293                                    crypto_aead_ivsize(aead));
294         crypto_put_default_rng();
295         if (err)
296                 goto out;
297 
298         ctx->sknull = crypto_get_default_null_skcipher2();
299         err = PTR_ERR(ctx->sknull);
300         if (IS_ERR(ctx->sknull))
301                 goto out;
302 
303         child = crypto_spawn_aead(aead_instance_ctx(inst));
304         err = PTR_ERR(child);
305         if (IS_ERR(child))
306                 goto drop_null;
307 
308         ctx->child = child;
309         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
310                                       sizeof(struct aead_request));
311 
312         err = 0;
313 
314 out:
315         return err;
316 
317 drop_null:
318         crypto_put_default_null_skcipher2();
319         goto out;
320 }
321 EXPORT_SYMBOL_GPL(aead_init_geniv);
322 
323 void aead_exit_geniv(struct crypto_aead *tfm)
324 {
325         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
326 
327         crypto_free_aead(ctx->child);
328         crypto_put_default_null_skcipher2();
329 }
330 EXPORT_SYMBOL_GPL(aead_exit_geniv);
331 
332 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
333                      u32 type, u32 mask)
334 {
335         spawn->base.frontend = &crypto_aead_type;
336         return crypto_grab_spawn(&spawn->base, name, type, mask);
337 }
338 EXPORT_SYMBOL_GPL(crypto_grab_aead);
339 
340 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
341 {
342         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
343 }
344 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
345 
346 static int aead_prepare_alg(struct aead_alg *alg)
347 {
348         struct crypto_alg *base = &alg->base;
349 
350         if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
351             PAGE_SIZE / 8)
352                 return -EINVAL;
353 
354         if (!alg->chunksize)
355                 alg->chunksize = base->cra_blocksize;
356 
357         base->cra_type = &crypto_aead_type;
358         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
359         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
360 
361         return 0;
362 }
363 
364 int crypto_register_aead(struct aead_alg *alg)
365 {
366         struct crypto_alg *base = &alg->base;
367         int err;
368 
369         err = aead_prepare_alg(alg);
370         if (err)
371                 return err;
372 
373         return crypto_register_alg(base);
374 }
375 EXPORT_SYMBOL_GPL(crypto_register_aead);
376 
377 void crypto_unregister_aead(struct aead_alg *alg)
378 {
379         crypto_unregister_alg(&alg->base);
380 }
381 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
382 
383 int crypto_register_aeads(struct aead_alg *algs, int count)
384 {
385         int i, ret;
386 
387         for (i = 0; i < count; i++) {
388                 ret = crypto_register_aead(&algs[i]);
389                 if (ret)
390                         goto err;
391         }
392 
393         return 0;
394 
395 err:
396         for (--i; i >= 0; --i)
397                 crypto_unregister_aead(&algs[i]);
398 
399         return ret;
400 }
401 EXPORT_SYMBOL_GPL(crypto_register_aeads);
402 
403 void crypto_unregister_aeads(struct aead_alg *algs, int count)
404 {
405         int i;
406 
407         for (i = count - 1; i >= 0; --i)
408                 crypto_unregister_aead(&algs[i]);
409 }
410 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
411 
412 int aead_register_instance(struct crypto_template *tmpl,
413                            struct aead_instance *inst)
414 {
415         int err;
416 
417         err = aead_prepare_alg(&inst->alg);
418         if (err)
419                 return err;
420 
421         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
422 }
423 EXPORT_SYMBOL_GPL(aead_register_instance);
424 
425 MODULE_LICENSE("GPL");
426 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
427 

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