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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
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 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}
70EXPORT_SYMBOL_GPL(crypto_aead_setkey);
71
72int 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}
88EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
89
90static 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
98static 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
117static 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
134nla_put_failure:
135 return -EMSGSIZE;
136}
137#else
138static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
139{
140 return -ENOSYS;
141}
142#endif
143
144static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
145 __maybe_unused;
146static 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
159static 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
171static 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
185static 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
193static 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
201struct 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
269out:
270 return inst;
271
272err_drop_alg:
273 crypto_drop_aead(spawn);
274err_free_inst:
275 kfree(inst);
276 inst = ERR_PTR(err);
277 goto out;
278}
279EXPORT_SYMBOL_GPL(aead_geniv_alloc);
280
281void aead_geniv_free(struct aead_instance *inst)
282{
283 crypto_drop_aead(aead_instance_ctx(inst));
284 kfree(inst);
285}
286EXPORT_SYMBOL_GPL(aead_geniv_free);
287
288int 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
323out:
324 return err;
325
326drop_null:
327 crypto_put_default_null_skcipher();
328 goto out;
329}
330EXPORT_SYMBOL_GPL(aead_init_geniv);
331
332void 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}
339EXPORT_SYMBOL_GPL(aead_exit_geniv);
340
341int 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}
347EXPORT_SYMBOL_GPL(crypto_grab_aead);
348
349struct 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}
353EXPORT_SYMBOL_GPL(crypto_alloc_aead);
354
355static 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
373int 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}
384EXPORT_SYMBOL_GPL(crypto_register_aead);
385
386void crypto_unregister_aead(struct aead_alg *alg)
387{
388 crypto_unregister_alg(&alg->base);
389}
390EXPORT_SYMBOL_GPL(crypto_unregister_aead);
391
392int 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
404err:
405 for (--i; i >= 0; --i)
406 crypto_unregister_aead(&algs[i]);
407
408 return ret;
409}
410EXPORT_SYMBOL_GPL(crypto_register_aeads);
411
412void 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}
419EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
420
421int 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}
432EXPORT_SYMBOL_GPL(aead_register_instance);
433
434MODULE_LICENSE("GPL");
435MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
1/*
2 * AEAD: Authenticated Encryption with Associated Data
3 *
4 * This file provides API support for AEAD algorithms.
5 *
6 * Copyright (c) 2007 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/aead.h>
16#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/rtnetlink.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/seq_file.h>
24
25#include "internal.h"
26
27static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 struct aead_alg *aead = crypto_aead_alg(tfm);
31 unsigned long alignmask = crypto_aead_alignmask(tfm);
32 int ret;
33 u8 *buffer, *alignbuffer;
34 unsigned long absize;
35
36 absize = keylen + alignmask;
37 buffer = kmalloc(absize, GFP_ATOMIC);
38 if (!buffer)
39 return -ENOMEM;
40
41 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
42 memcpy(alignbuffer, key, keylen);
43 ret = aead->setkey(tfm, alignbuffer, keylen);
44 memset(alignbuffer, 0, keylen);
45 kfree(buffer);
46 return ret;
47}
48
49static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
50{
51 struct aead_alg *aead = crypto_aead_alg(tfm);
52 unsigned long alignmask = crypto_aead_alignmask(tfm);
53
54 if ((unsigned long)key & alignmask)
55 return setkey_unaligned(tfm, key, keylen);
56
57 return aead->setkey(tfm, key, keylen);
58}
59
60int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
61{
62 struct aead_tfm *crt = crypto_aead_crt(tfm);
63 int err;
64
65 if (authsize > crypto_aead_alg(tfm)->maxauthsize)
66 return -EINVAL;
67
68 if (crypto_aead_alg(tfm)->setauthsize) {
69 err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
70 if (err)
71 return err;
72 }
73
74 crypto_aead_crt(crt->base)->authsize = authsize;
75 crt->authsize = authsize;
76 return 0;
77}
78EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
79
80static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
81 u32 mask)
82{
83 return alg->cra_ctxsize;
84}
85
86static int no_givcrypt(struct aead_givcrypt_request *req)
87{
88 return -ENOSYS;
89}
90
91static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
92{
93 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
94 struct aead_tfm *crt = &tfm->crt_aead;
95
96 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
97 return -EINVAL;
98
99 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
100 alg->setkey : setkey;
101 crt->encrypt = alg->encrypt;
102 crt->decrypt = alg->decrypt;
103 crt->givencrypt = alg->givencrypt ?: no_givcrypt;
104 crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
105 crt->base = __crypto_aead_cast(tfm);
106 crt->ivsize = alg->ivsize;
107 crt->authsize = alg->maxauthsize;
108
109 return 0;
110}
111
112static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
113 __attribute__ ((unused));
114static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
115{
116 struct aead_alg *aead = &alg->cra_aead;
117
118 seq_printf(m, "type : aead\n");
119 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
120 "yes" : "no");
121 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
122 seq_printf(m, "ivsize : %u\n", aead->ivsize);
123 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
124 seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
125}
126
127const struct crypto_type crypto_aead_type = {
128 .ctxsize = crypto_aead_ctxsize,
129 .init = crypto_init_aead_ops,
130#ifdef CONFIG_PROC_FS
131 .show = crypto_aead_show,
132#endif
133};
134EXPORT_SYMBOL_GPL(crypto_aead_type);
135
136static int aead_null_givencrypt(struct aead_givcrypt_request *req)
137{
138 return crypto_aead_encrypt(&req->areq);
139}
140
141static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
142{
143 return crypto_aead_decrypt(&req->areq);
144}
145
146static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
147{
148 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
149 struct aead_tfm *crt = &tfm->crt_aead;
150
151 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
152 return -EINVAL;
153
154 crt->setkey = setkey;
155 crt->encrypt = alg->encrypt;
156 crt->decrypt = alg->decrypt;
157 if (!alg->ivsize) {
158 crt->givencrypt = aead_null_givencrypt;
159 crt->givdecrypt = aead_null_givdecrypt;
160 }
161 crt->base = __crypto_aead_cast(tfm);
162 crt->ivsize = alg->ivsize;
163 crt->authsize = alg->maxauthsize;
164
165 return 0;
166}
167
168static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
169 __attribute__ ((unused));
170static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
171{
172 struct aead_alg *aead = &alg->cra_aead;
173
174 seq_printf(m, "type : nivaead\n");
175 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
176 "yes" : "no");
177 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
178 seq_printf(m, "ivsize : %u\n", aead->ivsize);
179 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
180 seq_printf(m, "geniv : %s\n", aead->geniv);
181}
182
183const struct crypto_type crypto_nivaead_type = {
184 .ctxsize = crypto_aead_ctxsize,
185 .init = crypto_init_nivaead_ops,
186#ifdef CONFIG_PROC_FS
187 .show = crypto_nivaead_show,
188#endif
189};
190EXPORT_SYMBOL_GPL(crypto_nivaead_type);
191
192static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
193 const char *name, u32 type, u32 mask)
194{
195 struct crypto_alg *alg;
196 int err;
197
198 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
199 type |= CRYPTO_ALG_TYPE_AEAD;
200 mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;
201
202 alg = crypto_alg_mod_lookup(name, type, mask);
203 if (IS_ERR(alg))
204 return PTR_ERR(alg);
205
206 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
207 crypto_mod_put(alg);
208 return err;
209}
210
211struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
212 struct rtattr **tb, u32 type,
213 u32 mask)
214{
215 const char *name;
216 struct crypto_aead_spawn *spawn;
217 struct crypto_attr_type *algt;
218 struct crypto_instance *inst;
219 struct crypto_alg *alg;
220 int err;
221
222 algt = crypto_get_attr_type(tb);
223 err = PTR_ERR(algt);
224 if (IS_ERR(algt))
225 return ERR_PTR(err);
226
227 if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
228 algt->mask)
229 return ERR_PTR(-EINVAL);
230
231 name = crypto_attr_alg_name(tb[1]);
232 err = PTR_ERR(name);
233 if (IS_ERR(name))
234 return ERR_PTR(err);
235
236 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
237 if (!inst)
238 return ERR_PTR(-ENOMEM);
239
240 spawn = crypto_instance_ctx(inst);
241
242 /* Ignore async algorithms if necessary. */
243 mask |= crypto_requires_sync(algt->type, algt->mask);
244
245 crypto_set_aead_spawn(spawn, inst);
246 err = crypto_grab_nivaead(spawn, name, type, mask);
247 if (err)
248 goto err_free_inst;
249
250 alg = crypto_aead_spawn_alg(spawn);
251
252 err = -EINVAL;
253 if (!alg->cra_aead.ivsize)
254 goto err_drop_alg;
255
256 /*
257 * This is only true if we're constructing an algorithm with its
258 * default IV generator. For the default generator we elide the
259 * template name and double-check the IV generator.
260 */
261 if (algt->mask & CRYPTO_ALG_GENIV) {
262 if (strcmp(tmpl->name, alg->cra_aead.geniv))
263 goto err_drop_alg;
264
265 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
266 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
267 CRYPTO_MAX_ALG_NAME);
268 } else {
269 err = -ENAMETOOLONG;
270 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
271 "%s(%s)", tmpl->name, alg->cra_name) >=
272 CRYPTO_MAX_ALG_NAME)
273 goto err_drop_alg;
274 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
275 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
276 CRYPTO_MAX_ALG_NAME)
277 goto err_drop_alg;
278 }
279
280 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
281 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
282 inst->alg.cra_priority = alg->cra_priority;
283 inst->alg.cra_blocksize = alg->cra_blocksize;
284 inst->alg.cra_alignmask = alg->cra_alignmask;
285 inst->alg.cra_type = &crypto_aead_type;
286
287 inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
288 inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
289 inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
290
291 inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
292 inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
293 inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
294 inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
295
296out:
297 return inst;
298
299err_drop_alg:
300 crypto_drop_aead(spawn);
301err_free_inst:
302 kfree(inst);
303 inst = ERR_PTR(err);
304 goto out;
305}
306EXPORT_SYMBOL_GPL(aead_geniv_alloc);
307
308void aead_geniv_free(struct crypto_instance *inst)
309{
310 crypto_drop_aead(crypto_instance_ctx(inst));
311 kfree(inst);
312}
313EXPORT_SYMBOL_GPL(aead_geniv_free);
314
315int aead_geniv_init(struct crypto_tfm *tfm)
316{
317 struct crypto_instance *inst = (void *)tfm->__crt_alg;
318 struct crypto_aead *aead;
319
320 aead = crypto_spawn_aead(crypto_instance_ctx(inst));
321 if (IS_ERR(aead))
322 return PTR_ERR(aead);
323
324 tfm->crt_aead.base = aead;
325 tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
326
327 return 0;
328}
329EXPORT_SYMBOL_GPL(aead_geniv_init);
330
331void aead_geniv_exit(struct crypto_tfm *tfm)
332{
333 crypto_free_aead(tfm->crt_aead.base);
334}
335EXPORT_SYMBOL_GPL(aead_geniv_exit);
336
337static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
338{
339 struct rtattr *tb[3];
340 struct {
341 struct rtattr attr;
342 struct crypto_attr_type data;
343 } ptype;
344 struct {
345 struct rtattr attr;
346 struct crypto_attr_alg data;
347 } palg;
348 struct crypto_template *tmpl;
349 struct crypto_instance *inst;
350 struct crypto_alg *larval;
351 const char *geniv;
352 int err;
353
354 larval = crypto_larval_lookup(alg->cra_driver_name,
355 CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
356 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
357 err = PTR_ERR(larval);
358 if (IS_ERR(larval))
359 goto out;
360
361 err = -EAGAIN;
362 if (!crypto_is_larval(larval))
363 goto drop_larval;
364
365 ptype.attr.rta_len = sizeof(ptype);
366 ptype.attr.rta_type = CRYPTOA_TYPE;
367 ptype.data.type = type | CRYPTO_ALG_GENIV;
368 /* GENIV tells the template that we're making a default geniv. */
369 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
370 tb[0] = &ptype.attr;
371
372 palg.attr.rta_len = sizeof(palg);
373 palg.attr.rta_type = CRYPTOA_ALG;
374 /* Must use the exact name to locate ourselves. */
375 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
376 tb[1] = &palg.attr;
377
378 tb[2] = NULL;
379
380 geniv = alg->cra_aead.geniv;
381
382 tmpl = crypto_lookup_template(geniv);
383 err = -ENOENT;
384 if (!tmpl)
385 goto kill_larval;
386
387 inst = tmpl->alloc(tb);
388 err = PTR_ERR(inst);
389 if (IS_ERR(inst))
390 goto put_tmpl;
391
392 if ((err = crypto_register_instance(tmpl, inst))) {
393 tmpl->free(inst);
394 goto put_tmpl;
395 }
396
397 /* Redo the lookup to use the instance we just registered. */
398 err = -EAGAIN;
399
400put_tmpl:
401 crypto_tmpl_put(tmpl);
402kill_larval:
403 crypto_larval_kill(larval);
404drop_larval:
405 crypto_mod_put(larval);
406out:
407 crypto_mod_put(alg);
408 return err;
409}
410
411static struct crypto_alg *crypto_lookup_aead(const char *name, u32 type,
412 u32 mask)
413{
414 struct crypto_alg *alg;
415
416 alg = crypto_alg_mod_lookup(name, type, mask);
417 if (IS_ERR(alg))
418 return alg;
419
420 if (alg->cra_type == &crypto_aead_type)
421 return alg;
422
423 if (!alg->cra_aead.ivsize)
424 return alg;
425
426 crypto_mod_put(alg);
427 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
428 mask & ~CRYPTO_ALG_TESTED);
429 if (IS_ERR(alg))
430 return alg;
431
432 if (alg->cra_type == &crypto_aead_type) {
433 if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
434 crypto_mod_put(alg);
435 alg = ERR_PTR(-ENOENT);
436 }
437 return alg;
438 }
439
440 BUG_ON(!alg->cra_aead.ivsize);
441
442 return ERR_PTR(crypto_nivaead_default(alg, type, mask));
443}
444
445int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
446 u32 type, u32 mask)
447{
448 struct crypto_alg *alg;
449 int err;
450
451 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
452 type |= CRYPTO_ALG_TYPE_AEAD;
453 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
454 mask |= CRYPTO_ALG_TYPE_MASK;
455
456 alg = crypto_lookup_aead(name, type, mask);
457 if (IS_ERR(alg))
458 return PTR_ERR(alg);
459
460 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
461 crypto_mod_put(alg);
462 return err;
463}
464EXPORT_SYMBOL_GPL(crypto_grab_aead);
465
466struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
467{
468 struct crypto_tfm *tfm;
469 int err;
470
471 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
472 type |= CRYPTO_ALG_TYPE_AEAD;
473 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
474 mask |= CRYPTO_ALG_TYPE_MASK;
475
476 for (;;) {
477 struct crypto_alg *alg;
478
479 alg = crypto_lookup_aead(alg_name, type, mask);
480 if (IS_ERR(alg)) {
481 err = PTR_ERR(alg);
482 goto err;
483 }
484
485 tfm = __crypto_alloc_tfm(alg, type, mask);
486 if (!IS_ERR(tfm))
487 return __crypto_aead_cast(tfm);
488
489 crypto_mod_put(alg);
490 err = PTR_ERR(tfm);
491
492err:
493 if (err != -EAGAIN)
494 break;
495 if (signal_pending(current)) {
496 err = -EINTR;
497 break;
498 }
499 }
500
501 return ERR_PTR(err);
502}
503EXPORT_SYMBOL_GPL(crypto_alloc_aead);
504
505MODULE_LICENSE("GPL");
506MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");