1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * AEAD: Authenticated Encryption with Associated Data
4 *
5 * This file provides API support for AEAD algorithms.
6 *
7 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
8 */
9
10 #include <crypto/internal/aead.h>
11 #include <linux/cryptouser.h>
12 #include <linux/errno.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/seq_file.h>
18 #include <linux/string.h>
19 #include <linux/string_choices.h>
20 #include <net/netlink.h>
21
22 #include "internal.h"
23
setkey_unaligned(struct crypto_aead * tfm,const u8 * key,unsigned int keylen)24 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
25 unsigned int keylen)
26 {
27 unsigned long alignmask = crypto_aead_alignmask(tfm);
28 int ret;
29 u8 *buffer, *alignbuffer;
30 unsigned long absize;
31
32 absize = keylen + alignmask;
33 buffer = kmalloc(absize, GFP_ATOMIC);
34 if (!buffer)
35 return -ENOMEM;
36
37 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
38 memcpy(alignbuffer, key, keylen);
39 ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
40 kfree_sensitive(buffer);
41 return ret;
42 }
43
crypto_aead_setkey(struct crypto_aead * tfm,const u8 * key,unsigned int keylen)44 int crypto_aead_setkey(struct crypto_aead *tfm,
45 const u8 *key, unsigned int keylen)
46 {
47 unsigned long alignmask = crypto_aead_alignmask(tfm);
48 int err;
49
50 if ((unsigned long)key & alignmask)
51 err = setkey_unaligned(tfm, key, keylen);
52 else
53 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
54
55 if (unlikely(err)) {
56 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
57 return err;
58 }
59
60 crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
61 return 0;
62 }
63 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
64
crypto_aead_setauthsize(struct crypto_aead * tfm,unsigned int authsize)65 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
66 {
67 int err;
68
69 if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
70 authsize > crypto_aead_maxauthsize(tfm))
71 return -EINVAL;
72
73 if (crypto_aead_alg(tfm)->setauthsize) {
74 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
75 if (err)
76 return err;
77 }
78
79 tfm->authsize = authsize;
80 return 0;
81 }
82 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
83
crypto_aead_encrypt(struct aead_request * req)84 int crypto_aead_encrypt(struct aead_request *req)
85 {
86 struct crypto_aead *aead = crypto_aead_reqtfm(req);
87
88 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
89 return -ENOKEY;
90
91 return crypto_aead_alg(aead)->encrypt(req);
92 }
93 EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
94
crypto_aead_decrypt(struct aead_request * req)95 int crypto_aead_decrypt(struct aead_request *req)
96 {
97 struct crypto_aead *aead = crypto_aead_reqtfm(req);
98
99 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
100 return -ENOKEY;
101
102 if (req->cryptlen < crypto_aead_authsize(aead))
103 return -EINVAL;
104
105 return crypto_aead_alg(aead)->decrypt(req);
106 }
107 EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
108
crypto_aead_exit_tfm(struct crypto_tfm * tfm)109 static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
110 {
111 struct crypto_aead *aead = __crypto_aead_cast(tfm);
112 struct aead_alg *alg = crypto_aead_alg(aead);
113
114 alg->exit(aead);
115 }
116
crypto_aead_init_tfm(struct crypto_tfm * tfm)117 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
118 {
119 struct crypto_aead *aead = __crypto_aead_cast(tfm);
120 struct aead_alg *alg = crypto_aead_alg(aead);
121
122 crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
123
124 aead->authsize = alg->maxauthsize;
125
126 if (alg->exit)
127 aead->base.exit = crypto_aead_exit_tfm;
128
129 if (alg->init)
130 return alg->init(aead);
131
132 return 0;
133 }
134
crypto_aead_report(struct sk_buff * skb,struct crypto_alg * alg)135 static int __maybe_unused crypto_aead_report(
136 struct sk_buff *skb, struct crypto_alg *alg)
137 {
138 struct crypto_report_aead raead;
139 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
140
141 memset(&raead, 0, sizeof(raead));
142
143 strscpy(raead.type, "aead", sizeof(raead.type));
144 strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
145
146 raead.blocksize = alg->cra_blocksize;
147 raead.maxauthsize = aead->maxauthsize;
148 raead.ivsize = aead->ivsize;
149
150 return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
151 }
152
153 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
154 __maybe_unused;
crypto_aead_show(struct seq_file * m,struct crypto_alg * alg)155 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
156 {
157 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
158
159 seq_printf(m, "type : aead\n");
160 seq_printf(m, "async : %s\n",
161 str_yes_no(alg->cra_flags & CRYPTO_ALG_ASYNC));
162 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
163 seq_printf(m, "ivsize : %u\n", aead->ivsize);
164 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
165 seq_printf(m, "geniv : <none>\n");
166 }
167
crypto_aead_free_instance(struct crypto_instance * inst)168 static void crypto_aead_free_instance(struct crypto_instance *inst)
169 {
170 struct aead_instance *aead = aead_instance(inst);
171
172 aead->free(aead);
173 }
174
175 static const struct crypto_type crypto_aead_type = {
176 .extsize = crypto_alg_extsize,
177 .init_tfm = crypto_aead_init_tfm,
178 .free = crypto_aead_free_instance,
179 #ifdef CONFIG_PROC_FS
180 .show = crypto_aead_show,
181 #endif
182 #if IS_ENABLED(CONFIG_CRYPTO_USER)
183 .report = crypto_aead_report,
184 #endif
185 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
186 .maskset = CRYPTO_ALG_TYPE_MASK,
187 .type = CRYPTO_ALG_TYPE_AEAD,
188 .tfmsize = offsetof(struct crypto_aead, base),
189 };
190
crypto_grab_aead(struct crypto_aead_spawn * spawn,struct crypto_instance * inst,const char * name,u32 type,u32 mask)191 int crypto_grab_aead(struct crypto_aead_spawn *spawn,
192 struct crypto_instance *inst,
193 const char *name, u32 type, u32 mask)
194 {
195 spawn->base.frontend = &crypto_aead_type;
196 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
197 }
198 EXPORT_SYMBOL_GPL(crypto_grab_aead);
199
crypto_alloc_aead(const char * alg_name,u32 type,u32 mask)200 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
201 {
202 return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
203 }
204 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
205
crypto_has_aead(const char * alg_name,u32 type,u32 mask)206 int crypto_has_aead(const char *alg_name, u32 type, u32 mask)
207 {
208 return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask);
209 }
210 EXPORT_SYMBOL_GPL(crypto_has_aead);
211
aead_prepare_alg(struct aead_alg * alg)212 static int aead_prepare_alg(struct aead_alg *alg)
213 {
214 struct crypto_alg *base = &alg->base;
215
216 if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
217 PAGE_SIZE / 8)
218 return -EINVAL;
219
220 if (!alg->chunksize)
221 alg->chunksize = base->cra_blocksize;
222
223 base->cra_type = &crypto_aead_type;
224 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
225 base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
226
227 return 0;
228 }
229
crypto_register_aead(struct aead_alg * alg)230 int crypto_register_aead(struct aead_alg *alg)
231 {
232 struct crypto_alg *base = &alg->base;
233 int err;
234
235 err = aead_prepare_alg(alg);
236 if (err)
237 return err;
238
239 return crypto_register_alg(base);
240 }
241 EXPORT_SYMBOL_GPL(crypto_register_aead);
242
crypto_unregister_aead(struct aead_alg * alg)243 void crypto_unregister_aead(struct aead_alg *alg)
244 {
245 crypto_unregister_alg(&alg->base);
246 }
247 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
248
crypto_register_aeads(struct aead_alg * algs,int count)249 int crypto_register_aeads(struct aead_alg *algs, int count)
250 {
251 int i, ret;
252
253 for (i = 0; i < count; i++) {
254 ret = crypto_register_aead(&algs[i]);
255 if (ret)
256 goto err;
257 }
258
259 return 0;
260
261 err:
262 for (--i; i >= 0; --i)
263 crypto_unregister_aead(&algs[i]);
264
265 return ret;
266 }
267 EXPORT_SYMBOL_GPL(crypto_register_aeads);
268
crypto_unregister_aeads(struct aead_alg * algs,int count)269 void crypto_unregister_aeads(struct aead_alg *algs, int count)
270 {
271 int i;
272
273 for (i = count - 1; i >= 0; --i)
274 crypto_unregister_aead(&algs[i]);
275 }
276 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
277
aead_register_instance(struct crypto_template * tmpl,struct aead_instance * inst)278 int aead_register_instance(struct crypto_template *tmpl,
279 struct aead_instance *inst)
280 {
281 int err;
282
283 if (WARN_ON(!inst->free))
284 return -EINVAL;
285
286 err = aead_prepare_alg(&inst->alg);
287 if (err)
288 return err;
289
290 return crypto_register_instance(tmpl, aead_crypto_instance(inst));
291 }
292 EXPORT_SYMBOL_GPL(aead_register_instance);
293
294 MODULE_LICENSE("GPL");
295 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
296