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