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
crypto_akcipher_report(struct sk_buff * skb,struct crypto_alg * alg)23 static int __maybe_unused crypto_akcipher_report(
24 struct sk_buff *skb, struct crypto_alg *alg)
25 {
26 struct crypto_report_akcipher rakcipher;
27
28 memset(&rakcipher, 0, sizeof(rakcipher));
29
30 strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
31
32 return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
33 sizeof(rakcipher), &rakcipher);
34 }
35
36 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
37 __maybe_unused;
38
crypto_akcipher_show(struct seq_file * m,struct crypto_alg * alg)39 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
40 {
41 seq_puts(m, "type : akcipher\n");
42 }
43
crypto_akcipher_exit_tfm(struct crypto_tfm * tfm)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
crypto_akcipher_init_tfm(struct crypto_tfm * tfm)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
crypto_akcipher_free_instance(struct crypto_instance * inst)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
crypto_akcipher_report_stat(struct sk_buff * skb,struct crypto_alg * alg)73 static int __maybe_unused crypto_akcipher_report_stat(
74 struct sk_buff *skb, struct crypto_alg *alg)
75 {
76 struct akcipher_alg *akcipher = __crypto_akcipher_alg(alg);
77 struct crypto_istat_akcipher *istat;
78 struct crypto_stat_akcipher rakcipher;
79
80 istat = akcipher_get_stat(akcipher);
81
82 memset(&rakcipher, 0, sizeof(rakcipher));
83
84 strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
85 rakcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
86 rakcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
87 rakcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt);
88 rakcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
89 rakcipher.stat_sign_cnt = atomic64_read(&istat->sign_cnt);
90 rakcipher.stat_verify_cnt = atomic64_read(&istat->verify_cnt);
91 rakcipher.stat_err_cnt = atomic64_read(&istat->err_cnt);
92
93 return nla_put(skb, CRYPTOCFGA_STAT_AKCIPHER,
94 sizeof(rakcipher), &rakcipher);
95 }
96
97 static const struct crypto_type crypto_akcipher_type = {
98 .extsize = crypto_alg_extsize,
99 .init_tfm = crypto_akcipher_init_tfm,
100 .free = crypto_akcipher_free_instance,
101 #ifdef CONFIG_PROC_FS
102 .show = crypto_akcipher_show,
103 #endif
104 #if IS_ENABLED(CONFIG_CRYPTO_USER)
105 .report = crypto_akcipher_report,
106 #endif
107 #ifdef CONFIG_CRYPTO_STATS
108 .report_stat = crypto_akcipher_report_stat,
109 #endif
110 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
111 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
112 .type = CRYPTO_ALG_TYPE_AKCIPHER,
113 .tfmsize = offsetof(struct crypto_akcipher, base),
114 };
115
crypto_grab_akcipher(struct crypto_akcipher_spawn * spawn,struct crypto_instance * inst,const char * name,u32 type,u32 mask)116 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
117 struct crypto_instance *inst,
118 const char *name, u32 type, u32 mask)
119 {
120 spawn->base.frontend = &crypto_akcipher_type;
121 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
122 }
123 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
124
crypto_alloc_akcipher(const char * alg_name,u32 type,u32 mask)125 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
126 u32 mask)
127 {
128 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
129 }
130 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
131
akcipher_prepare_alg(struct akcipher_alg * alg)132 static void akcipher_prepare_alg(struct akcipher_alg *alg)
133 {
134 struct crypto_istat_akcipher *istat = akcipher_get_stat(alg);
135 struct crypto_alg *base = &alg->base;
136
137 base->cra_type = &crypto_akcipher_type;
138 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
139 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
140
141 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
142 memset(istat, 0, sizeof(*istat));
143 }
144
akcipher_default_op(struct akcipher_request * req)145 static int akcipher_default_op(struct akcipher_request *req)
146 {
147 return -ENOSYS;
148 }
149
akcipher_default_set_key(struct crypto_akcipher * tfm,const void * key,unsigned int keylen)150 static int akcipher_default_set_key(struct crypto_akcipher *tfm,
151 const void *key, unsigned int keylen)
152 {
153 return -ENOSYS;
154 }
155
crypto_register_akcipher(struct akcipher_alg * alg)156 int crypto_register_akcipher(struct akcipher_alg *alg)
157 {
158 struct crypto_alg *base = &alg->base;
159
160 if (!alg->sign)
161 alg->sign = akcipher_default_op;
162 if (!alg->verify)
163 alg->verify = akcipher_default_op;
164 if (!alg->encrypt)
165 alg->encrypt = akcipher_default_op;
166 if (!alg->decrypt)
167 alg->decrypt = akcipher_default_op;
168 if (!alg->set_priv_key)
169 alg->set_priv_key = akcipher_default_set_key;
170
171 akcipher_prepare_alg(alg);
172 return crypto_register_alg(base);
173 }
174 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
175
crypto_unregister_akcipher(struct akcipher_alg * alg)176 void crypto_unregister_akcipher(struct akcipher_alg *alg)
177 {
178 crypto_unregister_alg(&alg->base);
179 }
180 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
181
akcipher_register_instance(struct crypto_template * tmpl,struct akcipher_instance * inst)182 int akcipher_register_instance(struct crypto_template *tmpl,
183 struct akcipher_instance *inst)
184 {
185 if (WARN_ON(!inst->free))
186 return -EINVAL;
187 akcipher_prepare_alg(&inst->alg);
188 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
189 }
190 EXPORT_SYMBOL_GPL(akcipher_register_instance);
191
crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data * data)192 int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data)
193 {
194 unsigned int reqsize = crypto_akcipher_reqsize(data->tfm);
195 struct akcipher_request *req;
196 struct scatterlist *sg;
197 unsigned int mlen;
198 unsigned int len;
199 u8 *buf;
200
201 if (data->dst)
202 mlen = max(data->slen, data->dlen);
203 else
204 mlen = data->slen + data->dlen;
205
206 len = sizeof(*req) + reqsize + mlen;
207 if (len < mlen)
208 return -EOVERFLOW;
209
210 req = kzalloc(len, GFP_KERNEL);
211 if (!req)
212 return -ENOMEM;
213
214 data->req = req;
215 akcipher_request_set_tfm(req, data->tfm);
216
217 buf = (u8 *)(req + 1) + reqsize;
218 data->buf = buf;
219 memcpy(buf, data->src, data->slen);
220
221 sg = &data->sg;
222 sg_init_one(sg, buf, mlen);
223 akcipher_request_set_crypt(req, sg, data->dst ? sg : NULL,
224 data->slen, data->dlen);
225
226 crypto_init_wait(&data->cwait);
227 akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
228 crypto_req_done, &data->cwait);
229
230 return 0;
231 }
232 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_prep);
233
crypto_akcipher_sync_post(struct crypto_akcipher_sync_data * data,int err)234 int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err)
235 {
236 err = crypto_wait_req(err, &data->cwait);
237 if (data->dst)
238 memcpy(data->dst, data->buf, data->dlen);
239 data->dlen = data->req->dst_len;
240 kfree_sensitive(data->req);
241 return err;
242 }
243 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_post);
244
crypto_akcipher_sync_encrypt(struct crypto_akcipher * tfm,const void * src,unsigned int slen,void * dst,unsigned int dlen)245 int crypto_akcipher_sync_encrypt(struct crypto_akcipher *tfm,
246 const void *src, unsigned int slen,
247 void *dst, unsigned int dlen)
248 {
249 struct crypto_akcipher_sync_data data = {
250 .tfm = tfm,
251 .src = src,
252 .dst = dst,
253 .slen = slen,
254 .dlen = dlen,
255 };
256
257 return crypto_akcipher_sync_prep(&data) ?:
258 crypto_akcipher_sync_post(&data,
259 crypto_akcipher_encrypt(data.req));
260 }
261 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_encrypt);
262
crypto_akcipher_sync_decrypt(struct crypto_akcipher * tfm,const void * src,unsigned int slen,void * dst,unsigned int dlen)263 int crypto_akcipher_sync_decrypt(struct crypto_akcipher *tfm,
264 const void *src, unsigned int slen,
265 void *dst, unsigned int dlen)
266 {
267 struct crypto_akcipher_sync_data data = {
268 .tfm = tfm,
269 .src = src,
270 .dst = dst,
271 .slen = slen,
272 .dlen = dlen,
273 };
274
275 return crypto_akcipher_sync_prep(&data) ?:
276 crypto_akcipher_sync_post(&data,
277 crypto_akcipher_decrypt(data.req)) ?:
278 data.dlen;
279 }
280 EXPORT_SYMBOL_GPL(crypto_akcipher_sync_decrypt);
281
crypto_exit_akcipher_ops_sig(struct crypto_tfm * tfm)282 static void crypto_exit_akcipher_ops_sig(struct crypto_tfm *tfm)
283 {
284 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
285
286 crypto_free_akcipher(*ctx);
287 }
288
crypto_init_akcipher_ops_sig(struct crypto_tfm * tfm)289 int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm)
290 {
291 struct crypto_akcipher **ctx = crypto_tfm_ctx(tfm);
292 struct crypto_alg *calg = tfm->__crt_alg;
293 struct crypto_akcipher *akcipher;
294
295 if (!crypto_mod_get(calg))
296 return -EAGAIN;
297
298 akcipher = crypto_create_tfm(calg, &crypto_akcipher_type);
299 if (IS_ERR(akcipher)) {
300 crypto_mod_put(calg);
301 return PTR_ERR(akcipher);
302 }
303
304 *ctx = akcipher;
305 tfm->exit = crypto_exit_akcipher_ops_sig;
306
307 return 0;
308 }
309 EXPORT_SYMBOL_GPL(crypto_init_akcipher_ops_sig);
310
311 MODULE_LICENSE("GPL");
312 MODULE_DESCRIPTION("Generic public key cipher type");
313