Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
3c339ab8 TS |
2 | /* |
3 | * Public Key Encryption | |
4 | * | |
5 | * Copyright (c) 2015, Intel Corporation | |
6 | * Authors: Tadeusz Struk <tadeusz.struk@intel.com> | |
3c339ab8 | 7 | */ |
035d78a1 HX |
8 | #include <crypto/internal/akcipher.h> |
9 | #include <linux/cryptouser.h> | |
3c339ab8 TS |
10 | #include <linux/errno.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
addde1f2 | 13 | #include <linux/scatterlist.h> |
3c339ab8 TS |
14 | #include <linux/seq_file.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/string.h> | |
3c339ab8 | 17 | #include <net/netlink.h> |
035d78a1 | 18 | |
3c339ab8 TS |
19 | #include "internal.h" |
20 | ||
6cb8815f | 21 | #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e |
addde1f2 | 22 | |
c0f9e01d HX |
23 | static int __maybe_unused crypto_akcipher_report( |
24 | struct sk_buff *skb, struct crypto_alg *alg) | |
3c339ab8 TS |
25 | { |
26 | struct crypto_report_akcipher rakcipher; | |
27 | ||
37db69e0 | 28 | memset(&rakcipher, 0, sizeof(rakcipher)); |
3c339ab8 | 29 | |
37db69e0 | 30 | strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); |
3c339ab8 | 31 | |
37db69e0 EB |
32 | return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, |
33 | sizeof(rakcipher), &rakcipher); | |
3c339ab8 | 34 | } |
3c339ab8 TS |
35 | |
36 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 37 | __maybe_unused; |
3c339ab8 TS |
38 | |
39 | static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
40 | { | |
41 | seq_puts(m, "type : akcipher\n"); | |
42 | } | |
43 | ||
44 | static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) | |
45 | { | |
46 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); | |
47 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); | |
48 | ||
49 | alg->exit(akcipher); | |
50 | } | |
51 | ||
52 | static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) | |
53 | { | |
54 | struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); | |
55 | struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); | |
56 | ||
57 | if (alg->exit) | |
58 | akcipher->base.exit = crypto_akcipher_exit_tfm; | |
59 | ||
60 | if (alg->init) | |
61 | return alg->init(akcipher); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
28a4618a AZ |
66 | static void crypto_akcipher_free_instance(struct crypto_instance *inst) |
67 | { | |
68 | struct akcipher_instance *akcipher = akcipher_instance(inst); | |
69 | ||
70 | akcipher->free(akcipher); | |
71 | } | |
72 | ||
3c339ab8 TS |
73 | static const struct crypto_type crypto_akcipher_type = { |
74 | .extsize = crypto_alg_extsize, | |
75 | .init_tfm = crypto_akcipher_init_tfm, | |
28a4618a | 76 | .free = crypto_akcipher_free_instance, |
3c339ab8 TS |
77 | #ifdef CONFIG_PROC_FS |
78 | .show = crypto_akcipher_show, | |
79 | #endif | |
b8969a1b | 80 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
3c339ab8 | 81 | .report = crypto_akcipher_report, |
035d78a1 | 82 | #endif |
3c339ab8 | 83 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
6cb8815f | 84 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, |
3c339ab8 TS |
85 | .type = CRYPTO_ALG_TYPE_AKCIPHER, |
86 | .tfmsize = offsetof(struct crypto_akcipher, base), | |
87 | }; | |
88 | ||
73bed26f EB |
89 | int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, |
90 | struct crypto_instance *inst, | |
91 | const char *name, u32 type, u32 mask) | |
28a4618a AZ |
92 | { |
93 | spawn->base.frontend = &crypto_akcipher_type; | |
de95c957 | 94 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
28a4618a AZ |
95 | } |
96 | EXPORT_SYMBOL_GPL(crypto_grab_akcipher); | |
97 | ||
3c339ab8 TS |
98 | struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, |
99 | u32 mask) | |
100 | { | |
101 | return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); | |
104 | ||
28a4618a | 105 | static void akcipher_prepare_alg(struct akcipher_alg *alg) |
3c339ab8 TS |
106 | { |
107 | struct crypto_alg *base = &alg->base; | |
108 | ||
109 | base->cra_type = &crypto_akcipher_type; | |
110 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
111 | base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; | |
28a4618a AZ |
112 | } |
113 | ||
78a0324f VC |
114 | static int akcipher_default_op(struct akcipher_request *req) |
115 | { | |
116 | return -ENOSYS; | |
117 | } | |
118 | ||
bc155c6c IK |
119 | static int akcipher_default_set_key(struct crypto_akcipher *tfm, |
120 | const void *key, unsigned int keylen) | |
121 | { | |
122 | return -ENOSYS; | |
123 | } | |
124 | ||
28a4618a AZ |
125 | int crypto_register_akcipher(struct akcipher_alg *alg) |
126 | { | |
127 | struct crypto_alg *base = &alg->base; | |
128 | ||
78a0324f VC |
129 | if (!alg->sign) |
130 | alg->sign = akcipher_default_op; | |
131 | if (!alg->verify) | |
132 | alg->verify = akcipher_default_op; | |
133 | if (!alg->encrypt) | |
134 | alg->encrypt = akcipher_default_op; | |
135 | if (!alg->decrypt) | |
136 | alg->decrypt = akcipher_default_op; | |
bc155c6c IK |
137 | if (!alg->set_priv_key) |
138 | alg->set_priv_key = akcipher_default_set_key; | |
78a0324f | 139 | |
28a4618a | 140 | akcipher_prepare_alg(alg); |
3c339ab8 TS |
141 | return crypto_register_alg(base); |
142 | } | |
143 | EXPORT_SYMBOL_GPL(crypto_register_akcipher); | |
144 | ||
145 | void crypto_unregister_akcipher(struct akcipher_alg *alg) | |
146 | { | |
147 | crypto_unregister_alg(&alg->base); | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); | |
150 | ||
28a4618a AZ |
151 | int akcipher_register_instance(struct crypto_template *tmpl, |
152 | struct akcipher_instance *inst) | |
153 | { | |
d4fdc2df EB |
154 | if (WARN_ON(!inst->free)) |
155 | return -EINVAL; | |
28a4618a AZ |
156 | akcipher_prepare_alg(&inst->alg); |
157 | return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(akcipher_register_instance); | |
160 | ||
6cb8815f | 161 | int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data) |
addde1f2 HX |
162 | { |
163 | unsigned int reqsize = crypto_akcipher_reqsize(data->tfm); | |
addde1f2 HX |
164 | struct akcipher_request *req; |
165 | struct scatterlist *sg; | |
891ebfdf | 166 | unsigned int mlen; |
addde1f2 HX |
167 | unsigned int len; |
168 | u8 *buf; | |
169 | ||
891ebfdf HX |
170 | if (data->dst) |
171 | mlen = max(data->slen, data->dlen); | |
172 | else | |
173 | mlen = data->slen + data->dlen; | |
174 | ||
addde1f2 HX |
175 | len = sizeof(*req) + reqsize + mlen; |
176 | if (len < mlen) | |
177 | return -EOVERFLOW; | |
178 | ||
179 | req = kzalloc(len, GFP_KERNEL); | |
180 | if (!req) | |
181 | return -ENOMEM; | |
182 | ||
183 | data->req = req; | |
767cfee8 | 184 | akcipher_request_set_tfm(req, data->tfm); |
addde1f2 HX |
185 | |
186 | buf = (u8 *)(req + 1) + reqsize; | |
187 | data->buf = buf; | |
188 | memcpy(buf, data->src, data->slen); | |
189 | ||
891ebfdf | 190 | sg = &data->sg; |
addde1f2 | 191 | sg_init_one(sg, buf, mlen); |
891ebfdf HX |
192 | akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL, |
193 | data->slen, data->dlen); | |
addde1f2 HX |
194 | |
195 | crypto_init_wait(&data->cwait); | |
196 | akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, | |
197 | crypto_req_done, &data->cwait); | |
198 | ||
199 | return 0; | |
200 | } | |
6cb8815f | 201 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep); |
addde1f2 | 202 | |
6cb8815f | 203 | int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err) |
addde1f2 HX |
204 | { |
205 | err = crypto_wait_req(err, &data->cwait); | |
486bfb05 HX |
206 | if (data->dst) |
207 | memcpy(data->dst, data->buf, data->dlen); | |
addde1f2 HX |
208 | data->dlen = data->req->dst_len; |
209 | kfree_sensitive(data->req); | |
210 | return err; | |
211 | } | |
6cb8815f | 212 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post); |
addde1f2 HX |
213 | |
214 | int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm, | |
215 | const void *src, unsigned int slen, | |
216 | void *dst, unsigned int dlen) | |
217 | { | |
218 | struct crypto_akcipher_sync_data data = { | |
219 | .tfm = tfm, | |
220 | .src = src, | |
221 | .dst = dst, | |
222 | .slen = slen, | |
223 | .dlen = dlen, | |
224 | }; | |
225 | ||
226 | return crypto_akcipher_sync_prep(&data) ?: | |
227 | crypto_akcipher_sync_post(&data, | |
228 | crypto_akcipher_encrypt(data.req)); | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt); | |
231 | ||
232 | int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm, | |
233 | const void *src, unsigned int slen, | |
234 | void *dst, unsigned int dlen) | |
235 | { | |
236 | struct crypto_akcipher_sync_data data = { | |
237 | .tfm = tfm, | |
238 | .src = src, | |
239 | .dst = dst, | |
240 | .slen = slen, | |
241 | .dlen = dlen, | |
242 | }; | |
243 | ||
244 | return crypto_akcipher_sync_prep(&data) ?: | |
245 | crypto_akcipher_sync_post(&data, | |
246 | crypto_akcipher_decrypt(data.req)) ?: | |
247 | data.dlen; | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt); | |
250 | ||
6cb8815f HX |
251 | static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm) |
252 | { | |
253 | struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); | |
254 | ||
255 | crypto_free_akcipher(*ctx); | |
256 | } | |
257 | ||
258 | int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm) | |
259 | { | |
260 | struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm); | |
261 | struct crypto_alg *calg = tfm->__crt_alg; | |
262 | struct crypto_akcipher *akcipher; | |
263 | ||
264 | if (!crypto_mod_get(calg)) | |
265 | return -EAGAIN; | |
266 | ||
267 | akcipher = crypto_create_tfm(calg, &crypto_akcipher_type); | |
268 | if (IS_ERR(akcipher)) { | |
269 | crypto_mod_put(calg); | |
270 | return PTR_ERR(akcipher); | |
271 | } | |
272 | ||
273 | *ctx = akcipher; | |
274 | tfm->exit = crypto_exit_akcipher_ops_sig; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig); | |
279 | ||
3c339ab8 | 280 | MODULE_LICENSE("GPL"); |
338a9de0 | 281 | MODULE_DESCRIPTION("Generic public key cipher type"); |