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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
32static 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
53int 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}
63EXPORT_SYMBOL_GPL(crypto_aead_setkey);
64
65int 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}
81EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
82
83static 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
91static 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
108static 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
125nla_put_failure:
126 return -EMSGSIZE;
127}
128#else
129static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
130{
131 return -ENOSYS;
132}
133#endif
134
135static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
136 __maybe_unused;
137static 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
150static 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
162static 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
176static 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
184static 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
192struct 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
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
260out:
261 return inst;
262
263err_drop_alg:
264 crypto_drop_aead(spawn);
265err_free_inst:
266 kfree(inst);
267 inst = ERR_PTR(err);
268 goto out;
269}
270EXPORT_SYMBOL_GPL(aead_geniv_alloc);
271
272void aead_geniv_free(struct aead_instance *inst)
273{
274 crypto_drop_aead(aead_instance_ctx(inst));
275 kfree(inst);
276}
277EXPORT_SYMBOL_GPL(aead_geniv_free);
278
279int 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
314out:
315 return err;
316
317drop_null:
318 crypto_put_default_null_skcipher2();
319 goto out;
320}
321EXPORT_SYMBOL_GPL(aead_init_geniv);
322
323void 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}
330EXPORT_SYMBOL_GPL(aead_exit_geniv);
331
332int 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}
338EXPORT_SYMBOL_GPL(crypto_grab_aead);
339
340struct 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}
344EXPORT_SYMBOL_GPL(crypto_alloc_aead);
345
346static 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
364int 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}
375EXPORT_SYMBOL_GPL(crypto_register_aead);
376
377void crypto_unregister_aead(struct aead_alg *alg)
378{
379 crypto_unregister_alg(&alg->base);
380}
381EXPORT_SYMBOL_GPL(crypto_unregister_aead);
382
383int 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
395err:
396 for (--i; i >= 0; --i)
397 crypto_unregister_aead(&algs[i]);
398
399 return ret;
400}
401EXPORT_SYMBOL_GPL(crypto_register_aeads);
402
403void 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}
410EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
411
412int 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}
423EXPORT_SYMBOL_GPL(aead_register_instance);
424
425MODULE_LICENSE("GPL");
426MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
427
