drm/i915: Set the map-and-fenceable flag for preallocated objects
[firefly-linux-kernel-4.4.55.git] / crypto / aead.c
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 <net/netlink.h>
28
29 #include "internal.h"
30
31 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
32                             unsigned int keylen)
33 {
34         unsigned long alignmask = crypto_aead_alignmask(tfm);
35         int ret;
36         u8 *buffer, *alignbuffer;
37         unsigned long absize;
38
39         absize = keylen + alignmask;
40         buffer = kmalloc(absize, GFP_ATOMIC);
41         if (!buffer)
42                 return -ENOMEM;
43
44         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
45         memcpy(alignbuffer, key, keylen);
46         ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
47         memset(alignbuffer, 0, keylen);
48         kfree(buffer);
49         return ret;
50 }
51
52 int crypto_aead_setkey(struct crypto_aead *tfm,
53                        const u8 *key, unsigned int keylen)
54 {
55         unsigned long alignmask = crypto_aead_alignmask(tfm);
56
57         if ((unsigned long)key & alignmask)
58                 return setkey_unaligned(tfm, key, keylen);
59
60         return crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
61 }
62 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
63
64 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
65 {
66         int err;
67
68         if (authsize > crypto_aead_maxauthsize(tfm))
69                 return -EINVAL;
70
71         if (crypto_aead_alg(tfm)->setauthsize) {
72                 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
73                 if (err)
74                         return err;
75         }
76
77         tfm->authsize = authsize;
78         return 0;
79 }
80 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
81
82 static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
83 {
84         struct crypto_aead *aead = __crypto_aead_cast(tfm);
85         struct aead_alg *alg = crypto_aead_alg(aead);
86
87         alg->exit(aead);
88 }
89
90 static int crypto_aead_init_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         aead->authsize = alg->maxauthsize;
96
97         if (alg->exit)
98                 aead->base.exit = crypto_aead_exit_tfm;
99
100         if (alg->init)
101                 return alg->init(aead);
102
103         return 0;
104 }
105
106 #ifdef CONFIG_NET
107 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
108 {
109         struct crypto_report_aead raead;
110         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
111
112         strncpy(raead.type, "aead", sizeof(raead.type));
113         strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
114
115         raead.blocksize = alg->cra_blocksize;
116         raead.maxauthsize = aead->maxauthsize;
117         raead.ivsize = aead->ivsize;
118
119         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
120                     sizeof(struct crypto_report_aead), &raead))
121                 goto nla_put_failure;
122         return 0;
123
124 nla_put_failure:
125         return -EMSGSIZE;
126 }
127 #else
128 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
129 {
130         return -ENOSYS;
131 }
132 #endif
133
134 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
135         __attribute__ ((unused));
136 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
137 {
138         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
139
140         seq_printf(m, "type         : aead\n");
141         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
142                                              "yes" : "no");
143         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
144         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
145         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
146         seq_printf(m, "geniv        : <none>\n");
147 }
148
149 static void crypto_aead_free_instance(struct crypto_instance *inst)
150 {
151         struct aead_instance *aead = aead_instance(inst);
152
153         if (!aead->free) {
154                 inst->tmpl->free(inst);
155                 return;
156         }
157
158         aead->free(aead);
159 }
160
161 static const struct crypto_type crypto_aead_type = {
162         .extsize = crypto_alg_extsize,
163         .init_tfm = crypto_aead_init_tfm,
164         .free = crypto_aead_free_instance,
165 #ifdef CONFIG_PROC_FS
166         .show = crypto_aead_show,
167 #endif
168         .report = crypto_aead_report,
169         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
170         .maskset = CRYPTO_ALG_TYPE_MASK,
171         .type = CRYPTO_ALG_TYPE_AEAD,
172         .tfmsize = offsetof(struct crypto_aead, base),
173 };
174
175 static int aead_geniv_setkey(struct crypto_aead *tfm,
176                              const u8 *key, unsigned int keylen)
177 {
178         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
179
180         return crypto_aead_setkey(ctx->child, key, keylen);
181 }
182
183 static int aead_geniv_setauthsize(struct crypto_aead *tfm,
184                                   unsigned int authsize)
185 {
186         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
187
188         return crypto_aead_setauthsize(ctx->child, authsize);
189 }
190
191 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
192                                        struct rtattr **tb, u32 type, u32 mask)
193 {
194         const char *name;
195         struct crypto_aead_spawn *spawn;
196         struct crypto_attr_type *algt;
197         struct aead_instance *inst;
198         struct aead_alg *alg;
199         unsigned int ivsize;
200         unsigned int maxauthsize;
201         int err;
202
203         algt = crypto_get_attr_type(tb);
204         if (IS_ERR(algt))
205                 return ERR_CAST(algt);
206
207         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
208                 return ERR_PTR(-EINVAL);
209
210         name = crypto_attr_alg_name(tb[1]);
211         if (IS_ERR(name))
212                 return ERR_CAST(name);
213
214         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
215         if (!inst)
216                 return ERR_PTR(-ENOMEM);
217
218         spawn = aead_instance_ctx(inst);
219
220         /* Ignore async algorithms if necessary. */
221         mask |= crypto_requires_sync(algt->type, algt->mask);
222
223         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
224         err = crypto_grab_aead(spawn, name, type, mask);
225         if (err)
226                 goto err_free_inst;
227
228         alg = crypto_spawn_aead_alg(spawn);
229
230         ivsize = crypto_aead_alg_ivsize(alg);
231         maxauthsize = crypto_aead_alg_maxauthsize(alg);
232
233         err = -EINVAL;
234         if (ivsize < sizeof(u64))
235                 goto err_drop_alg;
236
237         err = -ENAMETOOLONG;
238         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
239                      "%s(%s)", tmpl->name, alg->base.cra_name) >=
240             CRYPTO_MAX_ALG_NAME)
241                 goto err_drop_alg;
242         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
243                      "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
244             CRYPTO_MAX_ALG_NAME)
245                 goto err_drop_alg;
246
247         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
248         inst->alg.base.cra_priority = alg->base.cra_priority;
249         inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
250         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
251         inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
252
253         inst->alg.setkey = aead_geniv_setkey;
254         inst->alg.setauthsize = aead_geniv_setauthsize;
255
256         inst->alg.ivsize = ivsize;
257         inst->alg.maxauthsize = maxauthsize;
258
259 out:
260         return inst;
261
262 err_drop_alg:
263         crypto_drop_aead(spawn);
264 err_free_inst:
265         kfree(inst);
266         inst = ERR_PTR(err);
267         goto out;
268 }
269 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
270
271 void aead_geniv_free(struct aead_instance *inst)
272 {
273         crypto_drop_aead(aead_instance_ctx(inst));
274         kfree(inst);
275 }
276 EXPORT_SYMBOL_GPL(aead_geniv_free);
277
278 int aead_init_geniv(struct crypto_aead *aead)
279 {
280         struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
281         struct aead_instance *inst = aead_alg_instance(aead);
282         struct crypto_aead *child;
283         int err;
284
285         spin_lock_init(&ctx->lock);
286
287         err = crypto_get_default_rng();
288         if (err)
289                 goto out;
290
291         err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
292                                    crypto_aead_ivsize(aead));
293         crypto_put_default_rng();
294         if (err)
295                 goto out;
296
297         ctx->null = crypto_get_default_null_skcipher();
298         err = PTR_ERR(ctx->null);
299         if (IS_ERR(ctx->null))
300                 goto out;
301
302         child = crypto_spawn_aead(aead_instance_ctx(inst));
303         err = PTR_ERR(child);
304         if (IS_ERR(child))
305                 goto drop_null;
306
307         ctx->child = child;
308         crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
309                                       sizeof(struct aead_request));
310
311         err = 0;
312
313 out:
314         return err;
315
316 drop_null:
317         crypto_put_default_null_skcipher();
318         goto out;
319 }
320 EXPORT_SYMBOL_GPL(aead_init_geniv);
321
322 void aead_exit_geniv(struct crypto_aead *tfm)
323 {
324         struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
325
326         crypto_free_aead(ctx->child);
327         crypto_put_default_null_skcipher();
328 }
329 EXPORT_SYMBOL_GPL(aead_exit_geniv);
330
331 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
332                      u32 type, u32 mask)
333 {
334         spawn->base.frontend = &crypto_aead_type;
335         return crypto_grab_spawn(&spawn->base, name, type, mask);
336 }
337 EXPORT_SYMBOL_GPL(crypto_grab_aead);
338
339 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
340 {
341         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
342 }
343 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
344
345 static int aead_prepare_alg(struct aead_alg *alg)
346 {
347         struct crypto_alg *base = &alg->base;
348
349         if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
350                 return -EINVAL;
351
352         base->cra_type = &crypto_aead_type;
353         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
354         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
355
356         return 0;
357 }
358
359 int crypto_register_aead(struct aead_alg *alg)
360 {
361         struct crypto_alg *base = &alg->base;
362         int err;
363
364         err = aead_prepare_alg(alg);
365         if (err)
366                 return err;
367
368         return crypto_register_alg(base);
369 }
370 EXPORT_SYMBOL_GPL(crypto_register_aead);
371
372 void crypto_unregister_aead(struct aead_alg *alg)
373 {
374         crypto_unregister_alg(&alg->base);
375 }
376 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
377
378 int crypto_register_aeads(struct aead_alg *algs, int count)
379 {
380         int i, ret;
381
382         for (i = 0; i < count; i++) {
383                 ret = crypto_register_aead(&algs[i]);
384                 if (ret)
385                         goto err;
386         }
387
388         return 0;
389
390 err:
391         for (--i; i >= 0; --i)
392                 crypto_unregister_aead(&algs[i]);
393
394         return ret;
395 }
396 EXPORT_SYMBOL_GPL(crypto_register_aeads);
397
398 void crypto_unregister_aeads(struct aead_alg *algs, int count)
399 {
400         int i;
401
402         for (i = count - 1; i >= 0; --i)
403                 crypto_unregister_aead(&algs[i]);
404 }
405 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
406
407 int aead_register_instance(struct crypto_template *tmpl,
408                            struct aead_instance *inst)
409 {
410         int err;
411
412         err = aead_prepare_alg(&inst->alg);
413         if (err)
414                 return err;
415
416         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
417 }
418 EXPORT_SYMBOL_GPL(aead_register_instance);
419
420 MODULE_LICENSE("GPL");
421 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");