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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#include <linux/cryptouser.h>
25#include <net/netlink.h>
26
27#include "internal.h"
28
29static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
30 unsigned int keylen)
31{
32 struct aead_alg *aead = crypto_aead_alg(tfm);
33 unsigned long alignmask = crypto_aead_alignmask(tfm);
34 int ret;
35 u8 *buffer, *alignbuffer;
36 unsigned long absize;
37
38 absize = keylen + alignmask;
39 buffer = kmalloc(absize, GFP_ATOMIC);
40 if (!buffer)
41 return -ENOMEM;
42
43 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
44 memcpy(alignbuffer, key, keylen);
45 ret = aead->setkey(tfm, alignbuffer, keylen);
46 memset(alignbuffer, 0, keylen);
47 kfree(buffer);
48 return ret;
49}
50
51static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
52{
53 struct aead_alg *aead = crypto_aead_alg(tfm);
54 unsigned long alignmask = crypto_aead_alignmask(tfm);
55
56 if ((unsigned long)key & alignmask)
57 return setkey_unaligned(tfm, key, keylen);
58
59 return aead->setkey(tfm, key, keylen);
60}
61
62int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
63{
64 struct aead_tfm *crt = crypto_aead_crt(tfm);
65 int err;
66
67 if (authsize > crypto_aead_alg(tfm)->maxauthsize)
68 return -EINVAL;
69
70 if (crypto_aead_alg(tfm)->setauthsize) {
71 err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
72 if (err)
73 return err;
74 }
75
76 crypto_aead_crt(crt->base)->authsize = authsize;
77 crt->authsize = authsize;
78 return 0;
79}
80EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
81
82static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
83 u32 mask)
84{
85 return alg->cra_ctxsize;
86}
87
88static int no_givcrypt(struct aead_givcrypt_request *req)
89{
90 return -ENOSYS;
91}
92
93static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
94{
95 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
96 struct aead_tfm *crt = &tfm->crt_aead;
97
98 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
99 return -EINVAL;
100
101 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
102 alg->setkey : setkey;
103 crt->encrypt = alg->encrypt;
104 crt->decrypt = alg->decrypt;
105 crt->givencrypt = alg->givencrypt ?: no_givcrypt;
106 crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
107 crt->base = __crypto_aead_cast(tfm);
108 crt->ivsize = alg->ivsize;
109 crt->authsize = alg->maxauthsize;
110
111 return 0;
112}
113
114#ifdef CONFIG_NET
115static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
116{
117 struct crypto_report_aead raead;
118 struct aead_alg *aead = &alg->cra_aead;
119
120 strncpy(raead.type, "aead", sizeof(raead.type));
121 strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));
122
123 raead.blocksize = alg->cra_blocksize;
124 raead.maxauthsize = aead->maxauthsize;
125 raead.ivsize = aead->ivsize;
126
127 if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
128 sizeof(struct crypto_report_aead), &raead))
129 goto nla_put_failure;
130 return 0;
131
132nla_put_failure:
133 return -EMSGSIZE;
134}
135#else
136static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
137{
138 return -ENOSYS;
139}
140#endif
141
142static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
143 __attribute__ ((unused));
144static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
145{
146 struct aead_alg *aead = &alg->cra_aead;
147
148 seq_printf(m, "type : aead\n");
149 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
150 "yes" : "no");
151 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
152 seq_printf(m, "ivsize : %u\n", aead->ivsize);
153 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
154 seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
155}
156
157const struct crypto_type crypto_aead_type = {
158 .ctxsize = crypto_aead_ctxsize,
159 .init = crypto_init_aead_ops,
160#ifdef CONFIG_PROC_FS
161 .show = crypto_aead_show,
162#endif
163 .report = crypto_aead_report,
164};
165EXPORT_SYMBOL_GPL(crypto_aead_type);
166
167static int aead_null_givencrypt(struct aead_givcrypt_request *req)
168{
169 return crypto_aead_encrypt(&req->areq);
170}
171
172static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
173{
174 return crypto_aead_decrypt(&req->areq);
175}
176
177static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
178{
179 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
180 struct aead_tfm *crt = &tfm->crt_aead;
181
182 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
183 return -EINVAL;
184
185 crt->setkey = setkey;
186 crt->encrypt = alg->encrypt;
187 crt->decrypt = alg->decrypt;
188 if (!alg->ivsize) {
189 crt->givencrypt = aead_null_givencrypt;
190 crt->givdecrypt = aead_null_givdecrypt;
191 }
192 crt->base = __crypto_aead_cast(tfm);
193 crt->ivsize = alg->ivsize;
194 crt->authsize = alg->maxauthsize;
195
196 return 0;
197}
198
199#ifdef CONFIG_NET
200static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
201{
202 struct crypto_report_aead raead;
203 struct aead_alg *aead = &alg->cra_aead;
204
205 strncpy(raead.type, "nivaead", sizeof(raead.type));
206 strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));
207
208 raead.blocksize = alg->cra_blocksize;
209 raead.maxauthsize = aead->maxauthsize;
210 raead.ivsize = aead->ivsize;
211
212 if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
213 sizeof(struct crypto_report_aead), &raead))
214 goto nla_put_failure;
215 return 0;
216
217nla_put_failure:
218 return -EMSGSIZE;
219}
220#else
221static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
222{
223 return -ENOSYS;
224}
225#endif
226
227
228static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
229 __attribute__ ((unused));
230static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
231{
232 struct aead_alg *aead = &alg->cra_aead;
233
234 seq_printf(m, "type : nivaead\n");
235 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
236 "yes" : "no");
237 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
238 seq_printf(m, "ivsize : %u\n", aead->ivsize);
239 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
240 seq_printf(m, "geniv : %s\n", aead->geniv);
241}
242
243const struct crypto_type crypto_nivaead_type = {
244 .ctxsize = crypto_aead_ctxsize,
245 .init = crypto_init_nivaead_ops,
246#ifdef CONFIG_PROC_FS
247 .show = crypto_nivaead_show,
248#endif
249 .report = crypto_nivaead_report,
250};
251EXPORT_SYMBOL_GPL(crypto_nivaead_type);
252
253static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
254 const char *name, u32 type, u32 mask)
255{
256 struct crypto_alg *alg;
257 int err;
258
259 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
260 type |= CRYPTO_ALG_TYPE_AEAD;
261 mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;
262
263 alg = crypto_alg_mod_lookup(name, type, mask);
264 if (IS_ERR(alg))
265 return PTR_ERR(alg);
266
267 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
268 crypto_mod_put(alg);
269 return err;
270}
271
272struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
273 struct rtattr **tb, u32 type,
274 u32 mask)
275{
276 const char *name;
277 struct crypto_aead_spawn *spawn;
278 struct crypto_attr_type *algt;
279 struct crypto_instance *inst;
280 struct crypto_alg *alg;
281 int err;
282
283 algt = crypto_get_attr_type(tb);
284 if (IS_ERR(algt))
285 return ERR_CAST(algt);
286
287 if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
288 algt->mask)
289 return ERR_PTR(-EINVAL);
290
291 name = crypto_attr_alg_name(tb[1]);
292 if (IS_ERR(name))
293 return ERR_CAST(name);
294
295 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
296 if (!inst)
297 return ERR_PTR(-ENOMEM);
298
299 spawn = crypto_instance_ctx(inst);
300
301 /* Ignore async algorithms if necessary. */
302 mask |= crypto_requires_sync(algt->type, algt->mask);
303
304 crypto_set_aead_spawn(spawn, inst);
305 err = crypto_grab_nivaead(spawn, name, type, mask);
306 if (err)
307 goto err_free_inst;
308
309 alg = crypto_aead_spawn_alg(spawn);
310
311 err = -EINVAL;
312 if (!alg->cra_aead.ivsize)
313 goto err_drop_alg;
314
315 /*
316 * This is only true if we're constructing an algorithm with its
317 * default IV generator. For the default generator we elide the
318 * template name and double-check the IV generator.
319 */
320 if (algt->mask & CRYPTO_ALG_GENIV) {
321 if (strcmp(tmpl->name, alg->cra_aead.geniv))
322 goto err_drop_alg;
323
324 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
325 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
326 CRYPTO_MAX_ALG_NAME);
327 } else {
328 err = -ENAMETOOLONG;
329 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
330 "%s(%s)", tmpl->name, alg->cra_name) >=
331 CRYPTO_MAX_ALG_NAME)
332 goto err_drop_alg;
333 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
334 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
335 CRYPTO_MAX_ALG_NAME)
336 goto err_drop_alg;
337 }
338
339 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
340 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
341 inst->alg.cra_priority = alg->cra_priority;
342 inst->alg.cra_blocksize = alg->cra_blocksize;
343 inst->alg.cra_alignmask = alg->cra_alignmask;
344 inst->alg.cra_type = &crypto_aead_type;
345
346 inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
347 inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
348 inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
349
350 inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
351 inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
352 inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
353 inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
354
355out:
356 return inst;
357
358err_drop_alg:
359 crypto_drop_aead(spawn);
360err_free_inst:
361 kfree(inst);
362 inst = ERR_PTR(err);
363 goto out;
364}
365EXPORT_SYMBOL_GPL(aead_geniv_alloc);
366
367void aead_geniv_free(struct crypto_instance *inst)
368{
369 crypto_drop_aead(crypto_instance_ctx(inst));
370 kfree(inst);
371}
372EXPORT_SYMBOL_GPL(aead_geniv_free);
373
374int aead_geniv_init(struct crypto_tfm *tfm)
375{
376 struct crypto_instance *inst = (void *)tfm->__crt_alg;
377 struct crypto_aead *aead;
378
379 aead = crypto_spawn_aead(crypto_instance_ctx(inst));
380 if (IS_ERR(aead))
381 return PTR_ERR(aead);
382
383 tfm->crt_aead.base = aead;
384 tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
385
386 return 0;
387}
388EXPORT_SYMBOL_GPL(aead_geniv_init);
389
390void aead_geniv_exit(struct crypto_tfm *tfm)
391{
392 crypto_free_aead(tfm->crt_aead.base);
393}
394EXPORT_SYMBOL_GPL(aead_geniv_exit);
395
396static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
397{
398 struct rtattr *tb[3];
399 struct {
400 struct rtattr attr;
401 struct crypto_attr_type data;
402 } ptype;
403 struct {
404 struct rtattr attr;
405 struct crypto_attr_alg data;
406 } palg;
407 struct crypto_template *tmpl;
408 struct crypto_instance *inst;
409 struct crypto_alg *larval;
410 const char *geniv;
411 int err;
412
413 larval = crypto_larval_lookup(alg->cra_driver_name,
414 CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
415 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
416 err = PTR_ERR(larval);
417 if (IS_ERR(larval))
418 goto out;
419
420 err = -EAGAIN;
421 if (!crypto_is_larval(larval))
422 goto drop_larval;
423
424 ptype.attr.rta_len = sizeof(ptype);
425 ptype.attr.rta_type = CRYPTOA_TYPE;
426 ptype.data.type = type | CRYPTO_ALG_GENIV;
427 /* GENIV tells the template that we're making a default geniv. */
428 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
429 tb[0] = &ptype.attr;
430
431 palg.attr.rta_len = sizeof(palg);
432 palg.attr.rta_type = CRYPTOA_ALG;
433 /* Must use the exact name to locate ourselves. */
434 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
435 tb[1] = &palg.attr;
436
437 tb[2] = NULL;
438
439 geniv = alg->cra_aead.geniv;
440
441 tmpl = crypto_lookup_template(geniv);
442 err = -ENOENT;
443 if (!tmpl)
444 goto kill_larval;
445
446 inst = tmpl->alloc(tb);
447 err = PTR_ERR(inst);
448 if (IS_ERR(inst))
449 goto put_tmpl;
450
451 if ((err = crypto_register_instance(tmpl, inst))) {
452 tmpl->free(inst);
453 goto put_tmpl;
454 }
455
456 /* Redo the lookup to use the instance we just registered. */
457 err = -EAGAIN;
458
459put_tmpl:
460 crypto_tmpl_put(tmpl);
461kill_larval:
462 crypto_larval_kill(larval);
463drop_larval:
464 crypto_mod_put(larval);
465out:
466 crypto_mod_put(alg);
467 return err;
468}
469
470struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask)
471{
472 struct crypto_alg *alg;
473
474 alg = crypto_alg_mod_lookup(name, type, mask);
475 if (IS_ERR(alg))
476 return alg;
477
478 if (alg->cra_type == &crypto_aead_type)
479 return alg;
480
481 if (!alg->cra_aead.ivsize)
482 return alg;
483
484 crypto_mod_put(alg);
485 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
486 mask & ~CRYPTO_ALG_TESTED);
487 if (IS_ERR(alg))
488 return alg;
489
490 if (alg->cra_type == &crypto_aead_type) {
491 if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
492 crypto_mod_put(alg);
493 alg = ERR_PTR(-ENOENT);
494 }
495 return alg;
496 }
497
498 BUG_ON(!alg->cra_aead.ivsize);
499
500 return ERR_PTR(crypto_nivaead_default(alg, type, mask));
501}
502EXPORT_SYMBOL_GPL(crypto_lookup_aead);
503
504int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
505 u32 type, u32 mask)
506{
507 struct crypto_alg *alg;
508 int err;
509
510 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
511 type |= CRYPTO_ALG_TYPE_AEAD;
512 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
513 mask |= CRYPTO_ALG_TYPE_MASK;
514
515 alg = crypto_lookup_aead(name, type, mask);
516 if (IS_ERR(alg))
517 return PTR_ERR(alg);
518
519 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
520 crypto_mod_put(alg);
521 return err;
522}
523EXPORT_SYMBOL_GPL(crypto_grab_aead);
524
525struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
526{
527 struct crypto_tfm *tfm;
528 int err;
529
530 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
531 type |= CRYPTO_ALG_TYPE_AEAD;
532 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
533 mask |= CRYPTO_ALG_TYPE_MASK;
534
535 for (;;) {
536 struct crypto_alg *alg;
537
538 alg = crypto_lookup_aead(alg_name, type, mask);
539 if (IS_ERR(alg)) {
540 err = PTR_ERR(alg);
541 goto err;
542 }
543
544 tfm = __crypto_alloc_tfm(alg, type, mask);
545 if (!IS_ERR(tfm))
546 return __crypto_aead_cast(tfm);
547
548 crypto_mod_put(alg);
549 err = PTR_ERR(tfm);
550
551err:
552 if (err != -EAGAIN)
553 break;
554 if (signal_pending(current)) {
555 err = -EINTR;
556 break;
557 }
558 }
559
560 return ERR_PTR(err);
561}
562EXPORT_SYMBOL_GPL(crypto_alloc_aead);
563
564MODULE_LICENSE("GPL");
565MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");