1 /*-
2 * Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/param.h>
28 #include <sys/bus.h>
29 #include <sys/kernel.h>
30 #include <sys/kobj.h>
31 #include <sys/malloc.h>
32 #include <sys/module.h>
33 #include <sys/mutex.h>
34 #include <sys/smp.h>
35
36 #include <blake2.h>
37
38 #include <opencrypto/cryptodev.h>
39 #include <cryptodev_if.h>
40
41 #include <machine/fpu.h>
42
43 struct blake2_session {
44 size_t mlen;
45 };
46 CTASSERT((size_t)BLAKE2B_KEYBYTES > (size_t)BLAKE2S_KEYBYTES);
47
48 struct blake2_softc {
49 int32_t cid;
50 };
51
52 static int blake2_cipher_setup(struct blake2_session *ses,
53 const struct crypto_session_params *csp);
54 static int blake2_cipher_process(struct blake2_session *ses,
55 struct cryptop *crp);
56
57 MALLOC_DEFINE(M_BLAKE2, "blake2_data", "Blake2 Data");
58
59 static void
blake2_identify(driver_t * drv,device_t parent)60 blake2_identify(driver_t *drv, device_t parent)
61 {
62
63 /* NB: order 10 is so we get attached after h/w devices */
64 if (device_find_child(parent, "blaketwo", -1) == NULL &&
65 BUS_ADD_CHILD(parent, 10, "blaketwo", -1) == 0)
66 panic("blaketwo: could not attach");
67 }
68
69 static int
blake2_probe(device_t dev)70 blake2_probe(device_t dev)
71 {
72 device_set_desc(dev, "Blake2");
73 return (0);
74 }
75
76 static int
blake2_attach(device_t dev)77 blake2_attach(device_t dev)
78 {
79 struct blake2_softc *sc;
80
81 sc = device_get_softc(dev);
82
83 sc->cid = crypto_get_driverid(dev, sizeof(struct blake2_session),
84 CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC |
85 CRYPTOCAP_F_ACCEL_SOFTWARE);
86 if (sc->cid < 0) {
87 device_printf(dev, "Could not get crypto driver id.\n");
88 return (ENOMEM);
89 }
90
91 return (0);
92 }
93
94 static int
blake2_detach(device_t dev)95 blake2_detach(device_t dev)
96 {
97 struct blake2_softc *sc;
98
99 sc = device_get_softc(dev);
100
101 crypto_unregister_all(sc->cid);
102
103 return (0);
104 }
105
106 static int
blake2_probesession(device_t dev,const struct crypto_session_params * csp)107 blake2_probesession(device_t dev, const struct crypto_session_params *csp)
108 {
109
110 if (csp->csp_flags != 0)
111 return (EINVAL);
112 switch (csp->csp_mode) {
113 case CSP_MODE_DIGEST:
114 switch (csp->csp_auth_alg) {
115 case CRYPTO_BLAKE2B:
116 case CRYPTO_BLAKE2S:
117 break;
118 default:
119 return (EINVAL);
120 }
121 break;
122 default:
123 return (EINVAL);
124 }
125 return (CRYPTODEV_PROBE_ACCEL_SOFTWARE);
126 }
127
128 static int
blake2_newsession(device_t dev,crypto_session_t cses,const struct crypto_session_params * csp)129 blake2_newsession(device_t dev, crypto_session_t cses,
130 const struct crypto_session_params *csp)
131 {
132 struct blake2_session *ses;
133 int error;
134
135 ses = crypto_get_driver_session(cses);
136
137 error = blake2_cipher_setup(ses, csp);
138 if (error != 0) {
139 CRYPTDEB("setup failed");
140 return (error);
141 }
142
143 return (0);
144 }
145
146 static int
blake2_process(device_t dev,struct cryptop * crp,int hint __unused)147 blake2_process(device_t dev, struct cryptop *crp, int hint __unused)
148 {
149 struct blake2_session *ses;
150 int error;
151
152 ses = crypto_get_driver_session(crp->crp_session);
153 error = blake2_cipher_process(ses, crp);
154
155 crp->crp_etype = error;
156 crypto_done(crp);
157 return (0);
158 }
159
160 static device_method_t blake2_methods[] = {
161 DEVMETHOD(device_identify, blake2_identify),
162 DEVMETHOD(device_probe, blake2_probe),
163 DEVMETHOD(device_attach, blake2_attach),
164 DEVMETHOD(device_detach, blake2_detach),
165
166 DEVMETHOD(cryptodev_probesession, blake2_probesession),
167 DEVMETHOD(cryptodev_newsession, blake2_newsession),
168 DEVMETHOD(cryptodev_process, blake2_process),
169
170 DEVMETHOD_END
171 };
172
173 static driver_t blake2_driver = {
174 "blaketwo",
175 blake2_methods,
176 sizeof(struct blake2_softc),
177 };
178
179 DRIVER_MODULE(blake2, nexus, blake2_driver, 0, 0);
180 MODULE_VERSION(blake2, 1);
181 MODULE_DEPEND(blake2, crypto, 1, 1, 1);
182
183 static bool
blake2_check_klen(const struct crypto_session_params * csp,unsigned klen)184 blake2_check_klen(const struct crypto_session_params *csp, unsigned klen)
185 {
186
187 if (csp->csp_auth_alg == CRYPTO_BLAKE2S)
188 return (klen <= BLAKE2S_KEYBYTES);
189 else
190 return (klen <= BLAKE2B_KEYBYTES);
191 }
192
193 static int
blake2_cipher_setup(struct blake2_session * ses,const struct crypto_session_params * csp)194 blake2_cipher_setup(struct blake2_session *ses,
195 const struct crypto_session_params *csp)
196 {
197 int hashlen;
198
199 CTASSERT((size_t)BLAKE2S_OUTBYTES <= (size_t)BLAKE2B_OUTBYTES);
200
201 if (!blake2_check_klen(csp, csp->csp_auth_klen))
202 return (EINVAL);
203
204 if (csp->csp_auth_mlen < 0)
205 return (EINVAL);
206
207 switch (csp->csp_auth_alg) {
208 case CRYPTO_BLAKE2S:
209 hashlen = BLAKE2S_OUTBYTES;
210 break;
211 case CRYPTO_BLAKE2B:
212 hashlen = BLAKE2B_OUTBYTES;
213 break;
214 default:
215 return (EINVAL);
216 }
217
218 if (csp->csp_auth_mlen > hashlen)
219 return (EINVAL);
220
221 if (csp->csp_auth_mlen == 0)
222 ses->mlen = hashlen;
223 else
224 ses->mlen = csp->csp_auth_mlen;
225 return (0);
226 }
227
228 static int
blake2b_applicator(void * state,const void * buf,u_int len)229 blake2b_applicator(void *state, const void *buf, u_int len)
230 {
231 int rc;
232
233 rc = blake2b_update(state, buf, len);
234 if (rc != 0)
235 return (EINVAL);
236 return (0);
237 }
238
239 static int
blake2s_applicator(void * state,const void * buf,u_int len)240 blake2s_applicator(void *state, const void *buf, u_int len)
241 {
242 int rc;
243
244 rc = blake2s_update(state, buf, len);
245 if (rc != 0)
246 return (EINVAL);
247 return (0);
248 }
249
250 static int
blake2_cipher_process(struct blake2_session * ses,struct cryptop * crp)251 blake2_cipher_process(struct blake2_session *ses, struct cryptop *crp)
252 {
253 union {
254 blake2b_state sb;
255 blake2s_state ss;
256 } bctx;
257 char res[BLAKE2B_OUTBYTES], res2[BLAKE2B_OUTBYTES];
258 const struct crypto_session_params *csp;
259 const void *key;
260 int error, rc;
261 unsigned klen;
262
263 csp = crypto_get_params(crp->crp_session);
264 if (crp->crp_auth_key != NULL)
265 key = crp->crp_auth_key;
266 else
267 key = csp->csp_auth_key;
268 klen = csp->csp_auth_klen;
269
270 fpu_kern_enter(curthread, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX);
271
272 switch (csp->csp_auth_alg) {
273 case CRYPTO_BLAKE2B:
274 if (klen > 0)
275 rc = blake2b_init_key(&bctx.sb, ses->mlen, key, klen);
276 else
277 rc = blake2b_init(&bctx.sb, ses->mlen);
278 if (rc != 0) {
279 error = EINVAL;
280 break;
281 }
282 error = crypto_apply(crp, crp->crp_payload_start,
283 crp->crp_payload_length, blake2b_applicator, &bctx.sb);
284 if (error != 0)
285 break;
286 rc = blake2b_final(&bctx.sb, res, ses->mlen);
287 if (rc != 0)
288 error = EINVAL;
289 break;
290 case CRYPTO_BLAKE2S:
291 if (klen > 0)
292 rc = blake2s_init_key(&bctx.ss, ses->mlen, key, klen);
293 else
294 rc = blake2s_init(&bctx.ss, ses->mlen);
295 if (rc != 0) {
296 error = EINVAL;
297 break;
298 }
299 error = crypto_apply(crp, crp->crp_payload_start,
300 crp->crp_payload_length, blake2s_applicator, &bctx.ss);
301 if (error != 0)
302 break;
303 rc = blake2s_final(&bctx.ss, res, ses->mlen);
304 if (rc != 0)
305 error = EINVAL;
306 break;
307 default:
308 __assert_unreachable();
309 }
310
311 fpu_kern_leave(curthread, NULL);
312
313 if (error != 0)
314 return (error);
315
316 if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
317 crypto_copydata(crp, crp->crp_digest_start, ses->mlen, res2);
318 if (timingsafe_bcmp(res, res2, ses->mlen) != 0)
319 error = EBADMSG;
320 } else
321 crypto_copyback(crp, crp->crp_digest_start, ses->mlen, res);
322
323 return (error);
324 }
325