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10#include <crypto/internal/aead.h>
11#include <linux/errno.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/seq_file.h>
17#include <linux/cryptouser.h>
18#include <net/netlink.h>
19
20#include "internal.h"
21
22static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
23 unsigned int keylen)
24{
25 unsigned long alignmask = crypto_aead_alignmask(tfm);
26 int ret;
27 u8 *buffer, *alignbuffer;
28 unsigned long absize;
29
30 absize = keylen + alignmask;
31 buffer = kmalloc(absize, GFP_ATOMIC);
32 if (!buffer)
33 return -ENOMEM;
34
35 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
36 memcpy(alignbuffer, key, keylen);
37 ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
38 memset(alignbuffer, 0, keylen);
39 kfree(buffer);
40 return ret;
41}
42
43int crypto_aead_setkey(struct crypto_aead *tfm,
44 const u8 *key, unsigned int keylen)
45{
46 unsigned long alignmask = crypto_aead_alignmask(tfm);
47 int err;
48
49 if ((unsigned long)key & alignmask)
50 err = setkey_unaligned(tfm, key, keylen);
51 else
52 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
53
54 if (unlikely(err)) {
55 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
56 return err;
57 }
58
59 crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
60 return 0;
61}
62EXPORT_SYMBOL_GPL(crypto_aead_setkey);
63
64int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
65{
66 int err;
67
68 if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
69 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
83int crypto_aead_encrypt(struct aead_request *req)
84{
85 struct crypto_aead *aead = crypto_aead_reqtfm(req);
86 struct crypto_alg *alg = aead->base.__crt_alg;
87 unsigned int cryptlen = req->cryptlen;
88 int ret;
89
90 crypto_stats_get(alg);
91 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
92 ret = -ENOKEY;
93 else
94 ret = crypto_aead_alg(aead)->encrypt(req);
95 crypto_stats_aead_encrypt(cryptlen, alg, ret);
96 return ret;
97}
98EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
99
100int crypto_aead_decrypt(struct aead_request *req)
101{
102 struct crypto_aead *aead = crypto_aead_reqtfm(req);
103 struct crypto_alg *alg = aead->base.__crt_alg;
104 unsigned int cryptlen = req->cryptlen;
105 int ret;
106
107 crypto_stats_get(alg);
108 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
109 ret = -ENOKEY;
110 else if (req->cryptlen < crypto_aead_authsize(aead))
111 ret = -EINVAL;
112 else
113 ret = crypto_aead_alg(aead)->decrypt(req);
114 crypto_stats_aead_decrypt(cryptlen, alg, ret);
115 return ret;
116}
117EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
118
119static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
120{
121 struct crypto_aead *aead = __crypto_aead_cast(tfm);
122 struct aead_alg *alg = crypto_aead_alg(aead);
123
124 alg->exit(aead);
125}
126
127static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
128{
129 struct crypto_aead *aead = __crypto_aead_cast(tfm);
130 struct aead_alg *alg = crypto_aead_alg(aead);
131
132 crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
133
134 aead->authsize = alg->maxauthsize;
135
136 if (alg->exit)
137 aead->base.exit = crypto_aead_exit_tfm;
138
139 if (alg->init)
140 return alg->init(aead);
141
142 return 0;
143}
144
145#ifdef CONFIG_NET
146static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
147{
148 struct crypto_report_aead raead;
149 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
150
151 memset(&raead, 0, sizeof(raead));
152
153 strscpy(raead.type, "aead", sizeof(raead.type));
154 strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
155
156 raead.blocksize = alg->cra_blocksize;
157 raead.maxauthsize = aead->maxauthsize;
158 raead.ivsize = aead->ivsize;
159
160 return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
161}
162#else
163static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
164{
165 return -ENOSYS;
166}
167#endif
168
169static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
170 __maybe_unused;
171static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
172{
173 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
174
175 seq_printf(m, "type : aead\n");
176 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
177 "yes" : "no");
178 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
179 seq_printf(m, "ivsize : %u\n", aead->ivsize);
180 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
181 seq_printf(m, "geniv : <none>\n");
182}
183
184static void crypto_aead_free_instance(struct crypto_instance *inst)
185{
186 struct aead_instance *aead = aead_instance(inst);
187
188 aead->free(aead);
189}
190
191static const struct crypto_type crypto_aead_type = {
192 .extsize = crypto_alg_extsize,
193 .init_tfm = crypto_aead_init_tfm,
194 .free = crypto_aead_free_instance,
195#ifdef CONFIG_PROC_FS
196 .show = crypto_aead_show,
197#endif
198 .report = crypto_aead_report,
199 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
200 .maskset = CRYPTO_ALG_TYPE_MASK,
201 .type = CRYPTO_ALG_TYPE_AEAD,
202 .tfmsize = offsetof(struct crypto_aead, base),
203};
204
205int crypto_grab_aead(struct crypto_aead_spawn *spawn,
206 struct crypto_instance *inst,
207 const char *name, u32 type, u32 mask)
208{
209 spawn->base.frontend = &crypto_aead_type;
210 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
211}
212EXPORT_SYMBOL_GPL(crypto_grab_aead);
213
214struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
215{
216 return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
217}
218EXPORT_SYMBOL_GPL(crypto_alloc_aead);
219
220static int aead_prepare_alg(struct aead_alg *alg)
221{
222 struct crypto_alg *base = &alg->base;
223
224 if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
225 PAGE_SIZE / 8)
226 return -EINVAL;
227
228 if (!alg->chunksize)
229 alg->chunksize = base->cra_blocksize;
230
231 base->cra_type = &crypto_aead_type;
232 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
233 base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
234
235 return 0;
236}
237
238int crypto_register_aead(struct aead_alg *alg)
239{
240 struct crypto_alg *base = &alg->base;
241 int err;
242
243 err = aead_prepare_alg(alg);
244 if (err)
245 return err;
246
247 return crypto_register_alg(base);
248}
249EXPORT_SYMBOL_GPL(crypto_register_aead);
250
251void crypto_unregister_aead(struct aead_alg *alg)
252{
253 crypto_unregister_alg(&alg->base);
254}
255EXPORT_SYMBOL_GPL(crypto_unregister_aead);
256
257int crypto_register_aeads(struct aead_alg *algs, int count)
258{
259 int i, ret;
260
261 for (i = 0; i < count; i++) {
262 ret = crypto_register_aead(&algs[i]);
263 if (ret)
264 goto err;
265 }
266
267 return 0;
268
269err:
270 for (--i; i >= 0; --i)
271 crypto_unregister_aead(&algs[i]);
272
273 return ret;
274}
275EXPORT_SYMBOL_GPL(crypto_register_aeads);
276
277void crypto_unregister_aeads(struct aead_alg *algs, int count)
278{
279 int i;
280
281 for (i = count - 1; i >= 0; --i)
282 crypto_unregister_aead(&algs[i]);
283}
284EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
285
286int aead_register_instance(struct crypto_template *tmpl,
287 struct aead_instance *inst)
288{
289 int err;
290
291 if (WARN_ON(!inst->free))
292 return -EINVAL;
293
294 err = aead_prepare_alg(&inst->alg);
295 if (err)
296 return err;
297
298 return crypto_register_instance(tmpl, aead_crypto_instance(inst));
299}
300EXPORT_SYMBOL_GPL(aead_register_instance);
301
302MODULE_LICENSE("GPL");
303MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
304
