Merge tag 'irqchip-fixes-5.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-starfive.git] / crypto / aead.c
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/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
22 static 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
43 int 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 }
62 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
63
64 int 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 }
81 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
82
83 int 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 }
98 EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
99
100 int 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 }
117 EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
118
119 static 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
127 static 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
146 static 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
163 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
164 {
165         return -ENOSYS;
166 }
167 #endif
168
169 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
170         __maybe_unused;
171 static 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
184 static 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
191 static 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
205 int 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 }
212 EXPORT_SYMBOL_GPL(crypto_grab_aead);
213
214 struct 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 }
218 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
219
220 static 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
238 int 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 }
249 EXPORT_SYMBOL_GPL(crypto_register_aead);
250
251 void crypto_unregister_aead(struct aead_alg *alg)
252 {
253         crypto_unregister_alg(&alg->base);
254 }
255 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
256
257 int 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
269 err:
270         for (--i; i >= 0; --i)
271                 crypto_unregister_aead(&algs[i]);
272
273         return ret;
274 }
275 EXPORT_SYMBOL_GPL(crypto_register_aeads);
276
277 void 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 }
284 EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
285
286 int 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 }
300 EXPORT_SYMBOL_GPL(aead_register_instance);
301
302 MODULE_LICENSE("GPL");
303 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");