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1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://opensource.org/licenses/CDDL-1.0. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Copyright 2013 Saso Kiselkov. All rights reserved. | |
24 | */ | |
25 | ||
26 | #include <sys/modctl.h> | |
27 | #include <sys/crypto/common.h> | |
28 | #include <sys/crypto/spi.h> | |
29 | #include <sys/sysmacros.h> | |
30 | #include <sys/systm.h> | |
31 | #define SKEIN_MODULE_IMPL | |
32 | #include <sys/skein.h> | |
33 | ||
34 | /* | |
35 | * Like the sha2 module, we create the skein module with two modlinkages: | |
36 | * - modlmisc to allow direct calls to Skein_* API functions. | |
37 | * - modlcrypto to integrate well into the Kernel Crypto Framework (KCF). | |
38 | */ | |
39 | static struct modlmisc modlmisc = { | |
40 | &mod_cryptoops, | |
41 | "Skein Message-Digest Algorithm" | |
42 | }; | |
43 | ||
44 | static struct modlcrypto modlcrypto = { | |
45 | &mod_cryptoops, | |
46 | "Skein Kernel SW Provider" | |
47 | }; | |
48 | ||
49 | static struct modlinkage modlinkage = { | |
50 | MODREV_1, {&modlmisc, &modlcrypto, NULL} | |
51 | }; | |
52 | ||
53 | static crypto_mech_info_t skein_mech_info_tab[] = { | |
54 | {CKM_SKEIN_256, SKEIN_256_MECH_INFO_TYPE, | |
55 | CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC, | |
56 | 0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS}, | |
57 | {CKM_SKEIN_256_MAC, SKEIN_256_MAC_MECH_INFO_TYPE, | |
58 | CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX, | |
59 | CRYPTO_KEYSIZE_UNIT_IN_BYTES}, | |
60 | {CKM_SKEIN_512, SKEIN_512_MECH_INFO_TYPE, | |
61 | CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC, | |
62 | 0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS}, | |
63 | {CKM_SKEIN_512_MAC, SKEIN_512_MAC_MECH_INFO_TYPE, | |
64 | CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX, | |
65 | CRYPTO_KEYSIZE_UNIT_IN_BYTES}, | |
66 | {CKM_SKEIN1024, SKEIN1024_MECH_INFO_TYPE, | |
67 | CRYPTO_FG_DIGEST | CRYPTO_FG_DIGEST_ATOMIC, | |
68 | 0, 0, CRYPTO_KEYSIZE_UNIT_IN_BITS}, | |
69 | {CKM_SKEIN1024_MAC, SKEIN1024_MAC_MECH_INFO_TYPE, | |
70 | CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC, 1, INT_MAX, | |
71 | CRYPTO_KEYSIZE_UNIT_IN_BYTES} | |
72 | }; | |
73 | ||
74 | static void skein_provider_status(crypto_provider_handle_t, uint_t *); | |
75 | ||
76 | static crypto_control_ops_t skein_control_ops = { | |
77 | skein_provider_status | |
78 | }; | |
79 | ||
80 | static int skein_digest_init(crypto_ctx_t *, crypto_mechanism_t *, | |
81 | crypto_req_handle_t); | |
82 | static int skein_digest(crypto_ctx_t *, crypto_data_t *, crypto_data_t *, | |
83 | crypto_req_handle_t); | |
84 | static int skein_update(crypto_ctx_t *, crypto_data_t *, crypto_req_handle_t); | |
85 | static int skein_final(crypto_ctx_t *, crypto_data_t *, crypto_req_handle_t); | |
86 | static int skein_digest_atomic(crypto_provider_handle_t, crypto_session_id_t, | |
87 | crypto_mechanism_t *, crypto_data_t *, crypto_data_t *, | |
88 | crypto_req_handle_t); | |
89 | ||
90 | static crypto_digest_ops_t skein_digest_ops = { | |
91 | skein_digest_init, | |
92 | skein_digest, | |
93 | skein_update, | |
94 | NULL, | |
95 | skein_final, | |
96 | skein_digest_atomic | |
97 | }; | |
98 | ||
99 | static int skein_mac_init(crypto_ctx_t *, crypto_mechanism_t *, crypto_key_t *, | |
100 | crypto_spi_ctx_template_t, crypto_req_handle_t); | |
101 | static int skein_mac_atomic(crypto_provider_handle_t, crypto_session_id_t, | |
102 | crypto_mechanism_t *, crypto_key_t *, crypto_data_t *, crypto_data_t *, | |
103 | crypto_spi_ctx_template_t, crypto_req_handle_t); | |
104 | ||
105 | static crypto_mac_ops_t skein_mac_ops = { | |
106 | skein_mac_init, | |
107 | NULL, | |
108 | skein_update, /* using regular digest update is OK here */ | |
109 | skein_final, /* using regular digest final is OK here */ | |
110 | skein_mac_atomic, | |
111 | NULL | |
112 | }; | |
113 | ||
114 | static int skein_create_ctx_template(crypto_provider_handle_t, | |
115 | crypto_mechanism_t *, crypto_key_t *, crypto_spi_ctx_template_t *, | |
116 | size_t *, crypto_req_handle_t); | |
117 | static int skein_free_context(crypto_ctx_t *); | |
118 | ||
119 | static crypto_ctx_ops_t skein_ctx_ops = { | |
120 | skein_create_ctx_template, | |
121 | skein_free_context | |
122 | }; | |
123 | ||
124 | static crypto_ops_t skein_crypto_ops = {{{{{ | |
125 | &skein_control_ops, | |
126 | &skein_digest_ops, | |
127 | NULL, | |
128 | &skein_mac_ops, | |
129 | NULL, | |
130 | NULL, | |
131 | NULL, | |
132 | NULL, | |
133 | NULL, | |
134 | NULL, | |
135 | NULL, | |
136 | NULL, | |
137 | NULL, | |
138 | &skein_ctx_ops, | |
139 | }}}}}; | |
140 | ||
141 | static crypto_provider_info_t skein_prov_info = {{{{ | |
142 | CRYPTO_SPI_VERSION_1, | |
143 | "Skein Software Provider", | |
144 | CRYPTO_SW_PROVIDER, | |
145 | NULL, | |
146 | &skein_crypto_ops, | |
147 | sizeof (skein_mech_info_tab) / sizeof (crypto_mech_info_t), | |
148 | skein_mech_info_tab | |
149 | }}}}; | |
150 | ||
151 | static crypto_kcf_provider_handle_t skein_prov_handle = 0; | |
152 | ||
153 | typedef struct skein_ctx { | |
154 | skein_mech_type_t sc_mech_type; | |
155 | size_t sc_digest_bitlen; | |
156 | /*LINTED(E_ANONYMOUS_UNION_DECL)*/ | |
157 | union { | |
158 | Skein_256_Ctxt_t sc_256; | |
159 | Skein_512_Ctxt_t sc_512; | |
160 | Skein1024_Ctxt_t sc_1024; | |
161 | }; | |
162 | } skein_ctx_t; | |
163 | #define SKEIN_CTX(_ctx_) ((skein_ctx_t *)((_ctx_)->cc_provider_private)) | |
164 | #define SKEIN_CTX_LVALUE(_ctx_) (_ctx_)->cc_provider_private | |
165 | #define SKEIN_OP(_skein_ctx, _op, ...) \ | |
166 | do { \ | |
167 | skein_ctx_t *sc = (_skein_ctx); \ | |
168 | switch (sc->sc_mech_type) { \ | |
169 | case SKEIN_256_MECH_INFO_TYPE: \ | |
170 | case SKEIN_256_MAC_MECH_INFO_TYPE: \ | |
171 | (void) Skein_256_ ## _op(&sc->sc_256, __VA_ARGS__);\ | |
172 | break; \ | |
173 | case SKEIN_512_MECH_INFO_TYPE: \ | |
174 | case SKEIN_512_MAC_MECH_INFO_TYPE: \ | |
175 | (void) Skein_512_ ## _op(&sc->sc_512, __VA_ARGS__);\ | |
176 | break; \ | |
177 | case SKEIN1024_MECH_INFO_TYPE: \ | |
178 | case SKEIN1024_MAC_MECH_INFO_TYPE: \ | |
179 | (void) Skein1024_ ## _op(&sc->sc_1024, __VA_ARGS__);\ | |
180 | break; \ | |
181 | } \ | |
182 | _NOTE(CONSTCOND) \ | |
183 | } while (0) | |
184 | ||
185 | static int | |
186 | skein_get_digest_bitlen(const crypto_mechanism_t *mechanism, size_t *result) | |
187 | { | |
188 | if (mechanism->cm_param != NULL) { | |
189 | /*LINTED(E_BAD_PTR_CAST_ALIGN)*/ | |
190 | skein_param_t *param = (skein_param_t *)mechanism->cm_param; | |
191 | ||
192 | if (mechanism->cm_param_len != sizeof (*param) || | |
193 | param->sp_digest_bitlen == 0) { | |
194 | return (CRYPTO_MECHANISM_PARAM_INVALID); | |
195 | } | |
196 | *result = param->sp_digest_bitlen; | |
197 | } else { | |
198 | switch (mechanism->cm_type) { | |
199 | case SKEIN_256_MECH_INFO_TYPE: | |
200 | *result = 256; | |
201 | break; | |
202 | case SKEIN_512_MECH_INFO_TYPE: | |
203 | *result = 512; | |
204 | break; | |
205 | case SKEIN1024_MECH_INFO_TYPE: | |
206 | *result = 1024; | |
207 | break; | |
208 | default: | |
209 | return (CRYPTO_MECHANISM_INVALID); | |
210 | } | |
211 | } | |
212 | return (CRYPTO_SUCCESS); | |
213 | } | |
214 | ||
215 | int | |
216 | skein_mod_init(void) | |
217 | { | |
218 | int error; | |
219 | ||
220 | if ((error = mod_install(&modlinkage)) != 0) | |
221 | return (error); | |
222 | ||
223 | /* | |
224 | * Try to register with KCF - failure shouldn't unload us, since we | |
225 | * still may want to continue providing misc/skein functionality. | |
226 | */ | |
227 | (void) crypto_register_provider(&skein_prov_info, &skein_prov_handle); | |
228 | ||
229 | return (0); | |
230 | } | |
231 | ||
232 | int | |
233 | skein_mod_fini(void) { | |
234 | return (mod_remove(&modlinkage)); | |
235 | } | |
236 | ||
237 | /* | |
238 | * KCF software provider control entry points. | |
239 | */ | |
240 | /* ARGSUSED */ | |
241 | static void | |
242 | skein_provider_status(crypto_provider_handle_t provider, uint_t *status) | |
243 | { | |
244 | *status = CRYPTO_PROVIDER_READY; | |
245 | } | |
246 | ||
247 | /* | |
248 | * General Skein hashing helper functions. | |
249 | */ | |
250 | ||
251 | /* | |
252 | * Performs an Update on a context with uio input data. | |
253 | */ | |
254 | static int | |
255 | skein_digest_update_uio(skein_ctx_t *ctx, const crypto_data_t *data) | |
256 | { | |
257 | off_t offset = data->cd_offset; | |
258 | size_t length = data->cd_length; | |
259 | uint_t vec_idx; | |
260 | size_t cur_len; | |
261 | const uio_t *uio = data->cd_uio; | |
262 | ||
263 | /* we support only kernel buffer */ | |
264 | if (uio->uio_segflg != UIO_SYSSPACE) | |
265 | return (CRYPTO_ARGUMENTS_BAD); | |
266 | ||
267 | /* | |
268 | * Jump to the first iovec containing data to be | |
269 | * digested. | |
270 | */ | |
271 | for (vec_idx = 0; vec_idx < uio->uio_iovcnt && | |
272 | offset >= uio->uio_iov[vec_idx].iov_len; | |
273 | offset -= uio->uio_iov[vec_idx++].iov_len) | |
274 | ; | |
275 | if (vec_idx == uio->uio_iovcnt) { | |
276 | /* | |
277 | * The caller specified an offset that is larger than the | |
278 | * total size of the buffers it provided. | |
279 | */ | |
280 | return (CRYPTO_DATA_LEN_RANGE); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Now do the digesting on the iovecs. | |
285 | */ | |
286 | while (vec_idx < uio->uio_iovcnt && length > 0) { | |
287 | cur_len = MIN(uio->uio_iov[vec_idx].iov_len - offset, length); | |
288 | SKEIN_OP(ctx, Update, (uint8_t *)uio->uio_iov[vec_idx].iov_base | |
289 | + offset, cur_len); | |
290 | length -= cur_len; | |
291 | vec_idx++; | |
292 | offset = 0; | |
293 | } | |
294 | ||
295 | if (vec_idx == uio->uio_iovcnt && length > 0) { | |
296 | /* | |
297 | * The end of the specified iovec's was reached but | |
298 | * the length requested could not be processed, i.e. | |
299 | * The caller requested to digest more data than it provided. | |
300 | */ | |
301 | return (CRYPTO_DATA_LEN_RANGE); | |
302 | } | |
303 | ||
304 | return (CRYPTO_SUCCESS); | |
305 | } | |
306 | ||
307 | /* | |
308 | * Performs a Final on a context and writes to a uio digest output. | |
309 | */ | |
310 | static int | |
311 | skein_digest_final_uio(skein_ctx_t *ctx, crypto_data_t *digest, | |
312 | crypto_req_handle_t req) | |
313 | { | |
314 | off_t offset = digest->cd_offset; | |
315 | uint_t vec_idx; | |
316 | uio_t *uio = digest->cd_uio; | |
317 | ||
318 | /* we support only kernel buffer */ | |
319 | if (uio->uio_segflg != UIO_SYSSPACE) | |
320 | return (CRYPTO_ARGUMENTS_BAD); | |
321 | ||
322 | /* | |
323 | * Jump to the first iovec containing ptr to the digest to be returned. | |
324 | */ | |
325 | for (vec_idx = 0; offset >= uio->uio_iov[vec_idx].iov_len && | |
326 | vec_idx < uio->uio_iovcnt; | |
327 | offset -= uio->uio_iov[vec_idx++].iov_len) | |
328 | ; | |
329 | if (vec_idx == uio->uio_iovcnt) { | |
330 | /* | |
331 | * The caller specified an offset that is larger than the | |
332 | * total size of the buffers it provided. | |
333 | */ | |
334 | return (CRYPTO_DATA_LEN_RANGE); | |
335 | } | |
336 | if (offset + CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen) <= | |
337 | uio->uio_iov[vec_idx].iov_len) { | |
338 | /* The computed digest will fit in the current iovec. */ | |
339 | SKEIN_OP(ctx, Final, | |
340 | (uchar_t *)uio->uio_iov[vec_idx].iov_base + offset); | |
341 | } else { | |
342 | uint8_t *digest_tmp; | |
343 | off_t scratch_offset = 0; | |
344 | size_t length = CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen); | |
345 | size_t cur_len; | |
346 | ||
347 | digest_tmp = kmem_alloc(CRYPTO_BITS2BYTES( | |
348 | ctx->sc_digest_bitlen), crypto_kmflag(req)); | |
349 | if (digest_tmp == NULL) | |
350 | return (CRYPTO_HOST_MEMORY); | |
351 | SKEIN_OP(ctx, Final, digest_tmp); | |
352 | while (vec_idx < uio->uio_iovcnt && length > 0) { | |
353 | cur_len = MIN(uio->uio_iov[vec_idx].iov_len - offset, | |
354 | length); | |
355 | bcopy(digest_tmp + scratch_offset, | |
356 | uio->uio_iov[vec_idx].iov_base + offset, cur_len); | |
357 | ||
358 | length -= cur_len; | |
359 | vec_idx++; | |
360 | scratch_offset += cur_len; | |
361 | offset = 0; | |
362 | } | |
363 | kmem_free(digest_tmp, CRYPTO_BITS2BYTES(ctx->sc_digest_bitlen)); | |
364 | ||
365 | if (vec_idx == uio->uio_iovcnt && length > 0) { | |
366 | /* | |
367 | * The end of the specified iovec's was reached but | |
368 | * the length requested could not be processed, i.e. | |
369 | * The caller requested to digest more data than it | |
370 | * provided. | |
371 | */ | |
372 | return (CRYPTO_DATA_LEN_RANGE); | |
373 | } | |
374 | } | |
375 | ||
376 | return (CRYPTO_SUCCESS); | |
377 | } | |
378 | ||
379 | /* | |
380 | * KCF software provider digest entry points. | |
381 | */ | |
382 | ||
383 | /* | |
384 | * Initializes a skein digest context to the configuration in `mechanism'. | |
385 | * The mechanism cm_type must be one of SKEIN_*_MECH_INFO_TYPE. The cm_param | |
386 | * field may contain a skein_param_t structure indicating the length of the | |
387 | * digest the algorithm should produce. Otherwise the default output lengths | |
388 | * are applied (32 bytes for Skein-256, 64 bytes for Skein-512 and 128 bytes | |
389 | * for Skein-1024). | |
390 | */ | |
391 | static int | |
392 | skein_digest_init(crypto_ctx_t *ctx, crypto_mechanism_t *mechanism, | |
393 | crypto_req_handle_t req) | |
394 | { | |
395 | int error = CRYPTO_SUCCESS; | |
396 | ||
397 | if (!VALID_SKEIN_DIGEST_MECH(mechanism->cm_type)) | |
398 | return (CRYPTO_MECHANISM_INVALID); | |
399 | ||
400 | SKEIN_CTX_LVALUE(ctx) = kmem_alloc(sizeof (*SKEIN_CTX(ctx)), | |
401 | crypto_kmflag(req)); | |
402 | if (SKEIN_CTX(ctx) == NULL) | |
403 | return (CRYPTO_HOST_MEMORY); | |
404 | ||
405 | SKEIN_CTX(ctx)->sc_mech_type = mechanism->cm_type; | |
406 | error = skein_get_digest_bitlen(mechanism, | |
407 | &SKEIN_CTX(ctx)->sc_digest_bitlen); | |
408 | if (error != CRYPTO_SUCCESS) | |
409 | goto errout; | |
410 | SKEIN_OP(SKEIN_CTX(ctx), Init, SKEIN_CTX(ctx)->sc_digest_bitlen); | |
411 | ||
412 | return (CRYPTO_SUCCESS); | |
413 | errout: | |
414 | bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
415 | kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
416 | SKEIN_CTX_LVALUE(ctx) = NULL; | |
417 | return (error); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Executes a skein_update and skein_digest on a pre-initialized crypto | |
422 | * context in a single step. See the documentation to these functions to | |
423 | * see what to pass here. | |
424 | */ | |
425 | static int | |
426 | skein_digest(crypto_ctx_t *ctx, crypto_data_t *data, crypto_data_t *digest, | |
427 | crypto_req_handle_t req) | |
428 | { | |
429 | int error = CRYPTO_SUCCESS; | |
430 | ||
431 | ASSERT(SKEIN_CTX(ctx) != NULL); | |
432 | ||
433 | if (digest->cd_length < | |
434 | CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen)) { | |
435 | digest->cd_length = | |
436 | CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen); | |
437 | return (CRYPTO_BUFFER_TOO_SMALL); | |
438 | } | |
439 | ||
440 | error = skein_update(ctx, data, req); | |
441 | if (error != CRYPTO_SUCCESS) { | |
442 | bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
443 | kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
444 | SKEIN_CTX_LVALUE(ctx) = NULL; | |
445 | digest->cd_length = 0; | |
446 | return (error); | |
447 | } | |
448 | error = skein_final(ctx, digest, req); | |
449 | ||
450 | return (error); | |
451 | } | |
452 | ||
453 | /* | |
454 | * Performs a skein Update with the input message in `data' (successive calls | |
455 | * can push more data). This is used both for digest and MAC operation. | |
456 | * Supported input data formats are raw, uio and mblk. | |
457 | */ | |
458 | /*ARGSUSED*/ | |
459 | static int | |
460 | skein_update(crypto_ctx_t *ctx, crypto_data_t *data, crypto_req_handle_t req) | |
461 | { | |
462 | int error = CRYPTO_SUCCESS; | |
463 | ||
464 | ASSERT(SKEIN_CTX(ctx) != NULL); | |
465 | ||
466 | switch (data->cd_format) { | |
467 | case CRYPTO_DATA_RAW: | |
468 | SKEIN_OP(SKEIN_CTX(ctx), Update, | |
469 | (uint8_t *)data->cd_raw.iov_base + data->cd_offset, | |
470 | data->cd_length); | |
471 | break; | |
472 | case CRYPTO_DATA_UIO: | |
473 | error = skein_digest_update_uio(SKEIN_CTX(ctx), data); | |
474 | break; | |
475 | default: | |
476 | error = CRYPTO_ARGUMENTS_BAD; | |
477 | } | |
478 | ||
479 | return (error); | |
480 | } | |
481 | ||
482 | /* | |
483 | * Performs a skein Final, writing the output to `digest'. This is used both | |
484 | * for digest and MAC operation. | |
485 | * Supported output digest formats are raw, uio and mblk. | |
486 | */ | |
487 | /*ARGSUSED*/ | |
488 | static int | |
489 | skein_final(crypto_ctx_t *ctx, crypto_data_t *digest, crypto_req_handle_t req) | |
490 | { | |
491 | int error = CRYPTO_SUCCESS; | |
492 | ||
493 | ASSERT(SKEIN_CTX(ctx) != NULL); | |
494 | ||
495 | if (digest->cd_length < | |
496 | CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen)) { | |
497 | digest->cd_length = | |
498 | CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen); | |
499 | return (CRYPTO_BUFFER_TOO_SMALL); | |
500 | } | |
501 | ||
502 | switch (digest->cd_format) { | |
503 | case CRYPTO_DATA_RAW: | |
504 | SKEIN_OP(SKEIN_CTX(ctx), Final, | |
505 | (uint8_t *)digest->cd_raw.iov_base + digest->cd_offset); | |
506 | break; | |
507 | case CRYPTO_DATA_UIO: | |
508 | error = skein_digest_final_uio(SKEIN_CTX(ctx), digest, req); | |
509 | break; | |
510 | default: | |
511 | error = CRYPTO_ARGUMENTS_BAD; | |
512 | } | |
513 | ||
514 | if (error == CRYPTO_SUCCESS) | |
515 | digest->cd_length = | |
516 | CRYPTO_BITS2BYTES(SKEIN_CTX(ctx)->sc_digest_bitlen); | |
517 | else | |
518 | digest->cd_length = 0; | |
519 | ||
520 | bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
521 | kmem_free(SKEIN_CTX(ctx), sizeof (*(SKEIN_CTX(ctx)))); | |
522 | SKEIN_CTX_LVALUE(ctx) = NULL; | |
523 | ||
524 | return (error); | |
525 | } | |
526 | ||
527 | /* | |
528 | * Performs a full skein digest computation in a single call, configuring the | |
529 | * algorithm according to `mechanism', reading the input to be digested from | |
530 | * `data' and writing the output to `digest'. | |
531 | * Supported input/output formats are raw, uio and mblk. | |
532 | */ | |
533 | /*ARGSUSED*/ | |
534 | static int | |
535 | skein_digest_atomic(crypto_provider_handle_t provider, | |
536 | crypto_session_id_t session_id, crypto_mechanism_t *mechanism, | |
537 | crypto_data_t *data, crypto_data_t *digest, crypto_req_handle_t req) | |
538 | { | |
539 | int error; | |
540 | skein_ctx_t skein_ctx; | |
541 | crypto_ctx_t ctx; | |
542 | SKEIN_CTX_LVALUE(&ctx) = &skein_ctx; | |
543 | ||
544 | /* Init */ | |
545 | if (!VALID_SKEIN_DIGEST_MECH(mechanism->cm_type)) | |
546 | return (CRYPTO_MECHANISM_INVALID); | |
547 | skein_ctx.sc_mech_type = mechanism->cm_type; | |
548 | error = skein_get_digest_bitlen(mechanism, &skein_ctx.sc_digest_bitlen); | |
549 | if (error != CRYPTO_SUCCESS) | |
550 | goto out; | |
551 | SKEIN_OP(&skein_ctx, Init, skein_ctx.sc_digest_bitlen); | |
552 | ||
553 | if ((error = skein_update(&ctx, data, digest)) != CRYPTO_SUCCESS) | |
554 | goto out; | |
555 | if ((error = skein_final(&ctx, data, digest)) != CRYPTO_SUCCESS) | |
556 | goto out; | |
557 | ||
558 | out: | |
559 | if (error == CRYPTO_SUCCESS) | |
560 | digest->cd_length = | |
561 | CRYPTO_BITS2BYTES(skein_ctx.sc_digest_bitlen); | |
562 | else | |
563 | digest->cd_length = 0; | |
564 | bzero(&skein_ctx, sizeof (skein_ctx)); | |
565 | ||
566 | return (error); | |
567 | } | |
568 | ||
569 | /* | |
570 | * Helper function that builds a Skein MAC context from the provided | |
571 | * mechanism and key. | |
572 | */ | |
573 | static int | |
574 | skein_mac_ctx_build(skein_ctx_t *ctx, crypto_mechanism_t *mechanism, | |
575 | crypto_key_t *key) | |
576 | { | |
577 | int error; | |
578 | ||
579 | if (!VALID_SKEIN_MAC_MECH(mechanism->cm_type)) | |
580 | return (CRYPTO_MECHANISM_INVALID); | |
581 | if (key->ck_format != CRYPTO_KEY_RAW) | |
582 | return (CRYPTO_ARGUMENTS_BAD); | |
583 | ctx->sc_mech_type = mechanism->cm_type; | |
584 | error = skein_get_digest_bitlen(mechanism, &ctx->sc_digest_bitlen); | |
585 | if (error != CRYPTO_SUCCESS) | |
586 | return (error); | |
587 | SKEIN_OP(ctx, InitExt, ctx->sc_digest_bitlen, 0, key->ck_data, | |
588 | CRYPTO_BITS2BYTES(key->ck_length)); | |
589 | ||
590 | return (CRYPTO_SUCCESS); | |
591 | } | |
592 | ||
593 | /* | |
594 | * KCF software provide mac entry points. | |
595 | */ | |
596 | /* | |
597 | * Initializes a skein MAC context. You may pass a ctx_template, in which | |
598 | * case the template will be reused to make initialization more efficient. | |
599 | * Otherwise a new context will be constructed. The mechanism cm_type must | |
600 | * be one of SKEIN_*_MAC_MECH_INFO_TYPE. Same as in skein_digest_init, you | |
601 | * may pass a skein_param_t in cm_param to configure the length of the | |
602 | * digest. The key must be in raw format. | |
603 | */ | |
604 | static int | |
605 | skein_mac_init(crypto_ctx_t *ctx, crypto_mechanism_t *mechanism, | |
606 | crypto_key_t *key, crypto_spi_ctx_template_t ctx_template, | |
607 | crypto_req_handle_t req) | |
608 | { | |
609 | int error; | |
610 | ||
611 | SKEIN_CTX_LVALUE(ctx) = kmem_alloc(sizeof (*SKEIN_CTX(ctx)), | |
612 | crypto_kmflag(req)); | |
613 | if (SKEIN_CTX(ctx) == NULL) | |
614 | return (CRYPTO_HOST_MEMORY); | |
615 | ||
616 | if (ctx_template != NULL) { | |
617 | bcopy(ctx_template, SKEIN_CTX(ctx), | |
618 | sizeof (*SKEIN_CTX(ctx))); | |
619 | } else { | |
620 | error = skein_mac_ctx_build(SKEIN_CTX(ctx), mechanism, key); | |
621 | if (error != CRYPTO_SUCCESS) | |
622 | goto errout; | |
623 | } | |
624 | ||
625 | return (CRYPTO_SUCCESS); | |
626 | errout: | |
627 | bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
628 | kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
629 | return (error); | |
630 | } | |
631 | ||
632 | /* | |
633 | * The MAC update and final calls are reused from the regular digest code. | |
634 | */ | |
635 | ||
636 | /*ARGSUSED*/ | |
637 | /* | |
638 | * Same as skein_digest_atomic, performs an atomic Skein MAC operation in | |
639 | * one step. All the same properties apply to the arguments of this | |
640 | * function as to those of the partial operations above. | |
641 | */ | |
642 | static int | |
643 | skein_mac_atomic(crypto_provider_handle_t provider, | |
644 | crypto_session_id_t session_id, crypto_mechanism_t *mechanism, | |
645 | crypto_key_t *key, crypto_data_t *data, crypto_data_t *mac, | |
646 | crypto_spi_ctx_template_t ctx_template, crypto_req_handle_t req) | |
647 | { | |
648 | /* faux crypto context just for skein_digest_{update,final} */ | |
649 | int error; | |
650 | crypto_ctx_t ctx; | |
651 | skein_ctx_t skein_ctx; | |
652 | SKEIN_CTX_LVALUE(&ctx) = &skein_ctx; | |
653 | ||
654 | if (ctx_template != NULL) { | |
655 | bcopy(ctx_template, &skein_ctx, sizeof (skein_ctx)); | |
656 | } else { | |
657 | error = skein_mac_ctx_build(&skein_ctx, mechanism, key); | |
658 | if (error != CRYPTO_SUCCESS) | |
659 | goto errout; | |
660 | } | |
661 | ||
662 | if ((error = skein_update(&ctx, data, req)) != CRYPTO_SUCCESS) | |
663 | goto errout; | |
664 | if ((error = skein_final(&ctx, mac, req)) != CRYPTO_SUCCESS) | |
665 | goto errout; | |
666 | ||
667 | return (CRYPTO_SUCCESS); | |
668 | errout: | |
669 | bzero(&skein_ctx, sizeof (skein_ctx)); | |
670 | return (error); | |
671 | } | |
672 | ||
673 | /* | |
674 | * KCF software provider context management entry points. | |
675 | */ | |
676 | ||
677 | /* | |
678 | * Constructs a context template for the Skein MAC algorithm. The same | |
679 | * properties apply to the arguments of this function as to those of | |
680 | * skein_mac_init. | |
681 | */ | |
682 | /*ARGSUSED*/ | |
683 | static int | |
684 | skein_create_ctx_template(crypto_provider_handle_t provider, | |
685 | crypto_mechanism_t *mechanism, crypto_key_t *key, | |
686 | crypto_spi_ctx_template_t *ctx_template, size_t *ctx_template_size, | |
687 | crypto_req_handle_t req) | |
688 | { | |
689 | int error; | |
690 | skein_ctx_t *ctx_tmpl; | |
691 | ||
692 | ctx_tmpl = kmem_alloc(sizeof (*ctx_tmpl), crypto_kmflag(req)); | |
693 | if (ctx_tmpl == NULL) | |
694 | return (CRYPTO_HOST_MEMORY); | |
695 | error = skein_mac_ctx_build(ctx_tmpl, mechanism, key); | |
696 | if (error != CRYPTO_SUCCESS) | |
697 | goto errout; | |
698 | *ctx_template = ctx_tmpl; | |
699 | *ctx_template_size = sizeof (*ctx_tmpl); | |
700 | ||
701 | return (CRYPTO_SUCCESS); | |
702 | errout: | |
703 | bzero(ctx_tmpl, sizeof (*ctx_tmpl)); | |
704 | kmem_free(ctx_tmpl, sizeof (*ctx_tmpl)); | |
705 | return (error); | |
706 | } | |
707 | ||
708 | /* | |
709 | * Frees a skein context in a parent crypto context. | |
710 | */ | |
711 | static int | |
712 | skein_free_context(crypto_ctx_t *ctx) | |
713 | { | |
714 | if (SKEIN_CTX(ctx) != NULL) { | |
715 | bzero(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
716 | kmem_free(SKEIN_CTX(ctx), sizeof (*SKEIN_CTX(ctx))); | |
717 | SKEIN_CTX_LVALUE(ctx) = NULL; | |
718 | } | |
719 | ||
720 | return (CRYPTO_SUCCESS); | |
721 | } |