e_devcrypto.c@ 106165

最後變更在這個檔案從106165是 104078,由 vboxsync 提交於 8 月前
openssl-3.1.5: Applied and adjusted our OpenSSL changes to 3.1.4. bugref:10638
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1	/*
2	* Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved.
3	*
4	* Licensed under the Apache License 2.0 (the "License"). You may not use
5	* this file except in compliance with the License. You can obtain a copy
6	* in the file LICENSE in the source distribution or at
7	* https://www.openssl.org/source/license.html
8	*/
9
10	/* We need to use some deprecated APIs */
11	#define OPENSSL_SUPPRESS_DEPRECATED
12
13	#include "internal/e_os.h"
14	#include <string.h>
15	#include <sys/types.h>
16	#include <sys/stat.h>
17	#include <fcntl.h>
18	#include <sys/ioctl.h>
19	#include <unistd.h>
20	#include <assert.h>
21
22	#include <openssl/conf.h>
23	#include <openssl/evp.h>
24	#include <openssl/err.h>
25	#include <openssl/engine.h>
26	#include <openssl/objects.h>
27	#include "crypto/cryptodev.h"
28	#include "internal/nelem.h"
29
30	/* #define ENGINE_DEVCRYPTO_DEBUG */
31
32	#if CRYPTO_ALGORITHM_MIN < CRYPTO_ALGORITHM_MAX
33	# define CHECK_BSD_STYLE_MACROS
34	#endif
35
36	#define engine_devcrypto_id "devcrypto"
37
38	/*
39	* Use session2_op on FreeBSD which permits requesting specific
40	* drivers or classes of drivers at session creation time.
41	*/
42	#ifdef CIOCGSESSION2
43	typedef struct session2_op session_op_t;
44	#else
45	typedef struct session_op session_op_t;
46	#endif
47
48	/*
49	* ONE global file descriptor for all sessions. This allows operations
50	* such as digest session data copying (see digest_copy()), but is also
51	* saner... why re-open /dev/crypto for every session?
52	*/
53	static int cfd = -1;
54	#define DEVCRYPTO_REQUIRE_ACCELERATED 0 /* require confirmation of acceleration */
55	#define DEVCRYPTO_USE_SOFTWARE 1 /* allow software drivers */
56	#define DEVCRYPTO_REJECT_SOFTWARE 2 /* only disallow confirmed software drivers */
57
58	#define DEVCRYPTO_DEFAULT_USE_SOFTDRIVERS DEVCRYPTO_REJECT_SOFTWARE
59	static int use_softdrivers = DEVCRYPTO_DEFAULT_USE_SOFTDRIVERS;
60
61	/*
62	* cipher/digest status & acceleration definitions
63	* Make sure the defaults are set to 0
64	*/
65	struct driver_info_st {
66	enum devcrypto_status_t {
67	DEVCRYPTO_STATUS_FAILURE = -3, /* unusable for other reason */
68	DEVCRYPTO_STATUS_NO_CIOCCPHASH = -2, /* hash state copy not supported */
69	DEVCRYPTO_STATUS_NO_CIOCGSESSION = -1, /* session open failed */
70	DEVCRYPTO_STATUS_UNKNOWN = 0, /* not tested yet */
71	DEVCRYPTO_STATUS_USABLE = 1 /* algo can be used */
72	} status;
73
74	enum devcrypto_accelerated_t {
75	DEVCRYPTO_NOT_ACCELERATED = -1, /* software implemented */
76	DEVCRYPTO_ACCELERATION_UNKNOWN = 0, /* acceleration support unknown */
77	DEVCRYPTO_ACCELERATED = 1 /* hardware accelerated */
78	} accelerated;
79
80	char *driver_name;
81	};
82
83	#ifdef OPENSSL_NO_DYNAMIC_ENGINE
84	void engine_load_devcrypto_int(void);
85	#endif
86
87	static int clean_devcrypto_session(session_op_t *sess) {
88	if (ioctl(cfd, CIOCFSESSION, &sess->ses) < 0) {
89	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
90	return 0;
91	}
92	memset(sess, 0, sizeof(*sess));
93	return 1;
94	}
95
96	/******************************************************************************
97	*
98	* Ciphers
99	*
100	* Because they all do the same basic operation, we have only one set of
101	* method functions for them all to share, and a mapping table between
102	* NIDs and cryptodev IDs, with all the necessary size data.
103	*
104	*****/
105
106	struct cipher_ctx {
107	session_op_t sess;
108	int op; /* COP_ENCRYPT or COP_DECRYPT */
109	unsigned long mode; /* EVP_CIPH__MODE /
110
111	/* to handle ctr mode being a stream cipher */
112	unsigned char partial[EVP_MAX_BLOCK_LENGTH];
113	unsigned int blocksize, num;
114	};
115
116	static const struct cipher_data_st {
117	int nid;
118	int blocksize;
119	int keylen;
120	int ivlen;
121	int flags;
122	int devcryptoid;
123	} cipher_data[] = {
124	#ifndef OPENSSL_NO_DES
125	{ NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC },
126	{ NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC },
127	#endif
128	#ifndef OPENSSL_NO_BF
129	{ NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC },
130	#endif
131	#ifndef OPENSSL_NO_CAST
132	{ NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC },
133	#endif
134	{ NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
135	{ NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
136	{ NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
137	#ifndef OPENSSL_NO_RC4
138	{ NID_rc4, 1, 16, 0, EVP_CIPH_STREAM_CIPHER, CRYPTO_ARC4 },
139	#endif
140	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_AES_CTR)
141	{ NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
142	{ NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
143	{ NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
144	#endif
145	#if 0 /* Not yet supported */
146	{ NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
147	{ NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
148	#endif
149	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_AES_ECB)
150	{ NID_aes_128_ecb, 16, 128 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
151	{ NID_aes_192_ecb, 16, 192 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
152	{ NID_aes_256_ecb, 16, 256 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
153	#endif
154	#if 0 /* Not yet supported */
155	{ NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
156	{ NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
157	{ NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
158	#endif
159	#ifndef OPENSSL_NO_CAMELLIA
160	{ NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE,
161	CRYPTO_CAMELLIA_CBC },
162	{ NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE,
163	CRYPTO_CAMELLIA_CBC },
164	{ NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE,
165	CRYPTO_CAMELLIA_CBC },
166	#endif
167	};
168
169	static size_t find_cipher_data_index(int nid)
170	{
171	size_t i;
172
173	for (i = 0; i < OSSL_NELEM(cipher_data); i++)
174	if (nid == cipher_data[i].nid)
175	return i;
176	return (size_t)-1;
177	}
178
179	static size_t get_cipher_data_index(int nid)
180	{
181	size_t i = find_cipher_data_index(nid);
182
183	if (i != (size_t)-1)
184	return i;
185
186	/*
187	* Code further down must make sure that only NIDs in the table above
188	* are used. If any other NID reaches this function, there's a grave
189	* coding error further down.
190	*/
191	assert("Code that never should be reached" == NULL);
192	return -1;
193	}
194
195	static const struct cipher_data_st *get_cipher_data(int nid)
196	{
197	return &cipher_data[get_cipher_data_index(nid)];
198	}
199
200	/*
201	* Following are the three necessary functions to map OpenSSL functionality
202	* with cryptodev.
203	*/
204
205	static int cipher_init(EVP_CIPHER_CTX ctx, const unsigned char key,
206	const unsigned char *iv, int enc)
207	{
208	struct cipher_ctx *cipher_ctx =
209	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
210	const struct cipher_data_st *cipher_d =
211	get_cipher_data(EVP_CIPHER_CTX_get_nid(ctx));
212	int ret;
213
214	/* cleanup a previous session */
215	if (cipher_ctx->sess.ses != 0 &&
216	clean_devcrypto_session(&cipher_ctx->sess) == 0)
217	return 0;
218
219	cipher_ctx->sess.cipher = cipher_d->devcryptoid;
220	cipher_ctx->sess.keylen = cipher_d->keylen;
221	cipher_ctx->sess.key = (void *)key;
222	cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT;
223	cipher_ctx->mode = cipher_d->flags & EVP_CIPH_MODE;
224	cipher_ctx->blocksize = cipher_d->blocksize;
225	#ifdef CIOCGSESSION2
226	cipher_ctx->sess.crid = (use_softdrivers == DEVCRYPTO_USE_SOFTWARE) ?
227	CRYPTO_FLAG_SOFTWARE \| CRYPTO_FLAG_HARDWARE :
228	CRYPTO_FLAG_HARDWARE;
229	ret = ioctl(cfd, CIOCGSESSION2, &cipher_ctx->sess);
230	#else
231	ret = ioctl(cfd, CIOCGSESSION, &cipher_ctx->sess);
232	#endif
233	if (ret < 0) {
234	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
235	return 0;
236	}
237
238	return 1;
239	}
240
241	static int cipher_do_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
242	const unsigned char *in, size_t inl)
243	{
244	struct cipher_ctx *cipher_ctx =
245	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
246	struct crypt_op cryp;
247	unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
248	#if !defined(COP_FLAG_WRITE_IV)
249	unsigned char saved_iv[EVP_MAX_IV_LENGTH];
250	const unsigned char *ivptr;
251	size_t nblocks, ivlen;
252	#endif
253
254	memset(&cryp, 0, sizeof(cryp));
255	cryp.ses = cipher_ctx->sess.ses;
256	cryp.len = inl;
257	cryp.src = (void *)in;
258	cryp.dst = (void *)out;
259	cryp.iv = (void *)iv;
260	cryp.op = cipher_ctx->op;
261	#if !defined(COP_FLAG_WRITE_IV)
262	cryp.flags = 0;
263
264	ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
265	if (ivlen > 0)
266	switch (cipher_ctx->mode) {
267	case EVP_CIPH_CBC_MODE:
268	assert(inl >= ivlen);
269	if (!EVP_CIPHER_CTX_is_encrypting(ctx)) {
270	ivptr = in + inl - ivlen;
271	memcpy(saved_iv, ivptr, ivlen);
272	}
273	break;
274
275	case EVP_CIPH_CTR_MODE:
276	break;
277
278	default: /* should not happen */
279	return 0;
280	}
281	#else
282	cryp.flags = COP_FLAG_WRITE_IV;
283	#endif
284
285	if (ioctl(cfd, CIOCCRYPT, &cryp) < 0) {
286	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
287	return 0;
288	}
289
290	#if !defined(COP_FLAG_WRITE_IV)
291	if (ivlen > 0)
292	switch (cipher_ctx->mode) {
293	case EVP_CIPH_CBC_MODE:
294	assert(inl >= ivlen);
295	if (EVP_CIPHER_CTX_is_encrypting(ctx))
296	ivptr = out + inl - ivlen;
297	else
298	ivptr = saved_iv;
299
300	memcpy(iv, ivptr, ivlen);
301	break;
302
303	case EVP_CIPH_CTR_MODE:
304	nblocks = (inl + cipher_ctx->blocksize - 1)
305	/ cipher_ctx->blocksize;
306	do {
307	ivlen--;
308	nblocks += iv[ivlen];
309	iv[ivlen] = (uint8_t) nblocks;
310	nblocks >>= 8;
311	} while (ivlen);
312	break;
313
314	default: /* should not happen */
315	return 0;
316	}
317	#endif
318
319	return 1;
320	}
321
322	static int ctr_do_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
323	const unsigned char *in, size_t inl)
324	{
325	struct cipher_ctx *cipher_ctx =
326	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
327	size_t nblocks, len;
328
329	/* initial partial block */
330	while (cipher_ctx->num && inl) {
331	(out++) = (in++) ^ cipher_ctx->partial[cipher_ctx->num];
332	--inl;
333	cipher_ctx->num = (cipher_ctx->num + 1) % cipher_ctx->blocksize;
334	}
335
336	/* full blocks */
337	if (inl > (unsigned int) cipher_ctx->blocksize) {
338	nblocks = inl/cipher_ctx->blocksize;
339	len = nblocks * cipher_ctx->blocksize;
340	if (cipher_do_cipher(ctx, out, in, len) < 1)
341	return 0;
342	inl -= len;
343	out += len;
344	in += len;
345	}
346
347	/* final partial block */
348	if (inl) {
349	memset(cipher_ctx->partial, 0, cipher_ctx->blocksize);
350	if (cipher_do_cipher(ctx, cipher_ctx->partial, cipher_ctx->partial,
351	cipher_ctx->blocksize) < 1)
352	return 0;
353	while (inl--) {
354	out[cipher_ctx->num] = in[cipher_ctx->num]
355	^ cipher_ctx->partial[cipher_ctx->num];
356	cipher_ctx->num++;
357	}
358	}
359
360	return 1;
361	}
362
363	static int cipher_ctrl(EVP_CIPHER_CTX ctx, int type, int p1, void p2)
364	{
365	struct cipher_ctx *cipher_ctx =
366	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
367	EVP_CIPHER_CTX to_ctx = (EVP_CIPHER_CTX )p2;
368	struct cipher_ctx *to_cipher_ctx;
369
370	switch (type) {
371
372	case EVP_CTRL_COPY:
373	if (cipher_ctx == NULL)
374	return 1;
375	/* when copying the context, a new session needs to be initialized */
376	to_cipher_ctx =
377	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(to_ctx);
378	memset(&to_cipher_ctx->sess, 0, sizeof(to_cipher_ctx->sess));
379	return cipher_init(to_ctx, (void *)cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
380	(cipher_ctx->op == COP_ENCRYPT));
381
382	case EVP_CTRL_INIT:
383	memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
384	return 1;
385
386	default:
387	break;
388	}
389
390	return -1;
391	}
392
393	static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
394	{
395	struct cipher_ctx *cipher_ctx =
396	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
397
398	return clean_devcrypto_session(&cipher_ctx->sess);
399	}
400
401	/*
402	* Keep tables of known nids, associated methods, selected ciphers, and driver
403	* info.
404	* Note that known_cipher_nids[] isn't necessarily indexed the same way as
405	* cipher_data[] above, which the other tables are.
406	*/
407	static int known_cipher_nids[OSSL_NELEM(cipher_data)];
408	static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
409	static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };
410	static int selected_ciphers[OSSL_NELEM(cipher_data)];
411	static struct driver_info_st cipher_driver_info[OSSL_NELEM(cipher_data)];
412
413
414	static int devcrypto_test_cipher(size_t cipher_data_index)
415	{
416	return (cipher_driver_info[cipher_data_index].status == DEVCRYPTO_STATUS_USABLE
417	&& selected_ciphers[cipher_data_index] == 1
418	&& (cipher_driver_info[cipher_data_index].accelerated
419	== DEVCRYPTO_ACCELERATED
420	\|\| use_softdrivers == DEVCRYPTO_USE_SOFTWARE
421	\|\| (cipher_driver_info[cipher_data_index].accelerated
422	!= DEVCRYPTO_NOT_ACCELERATED
423	&& use_softdrivers == DEVCRYPTO_REJECT_SOFTWARE)));
424	}
425
426	static void prepare_cipher_methods(void)
427	{
428	size_t i;
429	session_op_t sess;
430	unsigned long cipher_mode;
431	#ifdef CIOCGSESSION2
432	struct crypt_find_op fop;
433	enum devcrypto_accelerated_t accelerated;
434	#elif defined(CIOCGSESSINFO)
435	struct session_info_op siop;
436	#endif
437
438	memset(&cipher_driver_info, 0, sizeof(cipher_driver_info));
439
440	memset(&sess, 0, sizeof(sess));
441	sess.key = (void *)"01234567890123456789012345678901234567890123456789";
442
443	for (i = 0, known_cipher_nids_amount = 0;
444	i < OSSL_NELEM(cipher_data); i++) {
445
446	selected_ciphers[i] = 1;
447	/*
448	* Check that the cipher is usable
449	*/
450	sess.cipher = cipher_data[i].devcryptoid;
451	sess.keylen = cipher_data[i].keylen;
452	#ifdef CIOCGSESSION2
453	/*
454	* When using CIOCGSESSION2, first try to allocate a hardware
455	* ("accelerated") session. If that fails, fall back to
456	* allocating a software session.
457	*/
458	sess.crid = CRYPTO_FLAG_HARDWARE;
459	if (ioctl(cfd, CIOCGSESSION2, &sess) == 0) {
460	accelerated = DEVCRYPTO_ACCELERATED;
461	} else {
462	sess.crid = CRYPTO_FLAG_SOFTWARE;
463	if (ioctl(cfd, CIOCGSESSION2, &sess) < 0) {
464	cipher_driver_info[i].status = DEVCRYPTO_STATUS_NO_CIOCGSESSION;
465	continue;
466	}
467	accelerated = DEVCRYPTO_NOT_ACCELERATED;
468	}
469	#else
470	if (ioctl(cfd, CIOCGSESSION, &sess) < 0) {
471	cipher_driver_info[i].status = DEVCRYPTO_STATUS_NO_CIOCGSESSION;
472	continue;
473	}
474	#endif
475
476	cipher_mode = cipher_data[i].flags & EVP_CIPH_MODE;
477
478	if ((known_cipher_methods[i] =
479	EVP_CIPHER_meth_new(cipher_data[i].nid,
480	cipher_mode == EVP_CIPH_CTR_MODE ? 1 :
481	cipher_data[i].blocksize,
482	cipher_data[i].keylen)) == NULL
483	\|\| !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
484	cipher_data[i].ivlen)
485	\|\| !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
486	cipher_data[i].flags
487	\| EVP_CIPH_CUSTOM_COPY
488	\| EVP_CIPH_CTRL_INIT
489	\| EVP_CIPH_FLAG_DEFAULT_ASN1)
490	\|\| !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
491	\|\| !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
492	cipher_mode == EVP_CIPH_CTR_MODE ?
493	ctr_do_cipher :
494	cipher_do_cipher)
495	\|\| !EVP_CIPHER_meth_set_ctrl(known_cipher_methods[i], cipher_ctrl)
496	\|\| !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i],
497	cipher_cleanup)
498	\|\| !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i],
499	sizeof(struct cipher_ctx))) {
500	cipher_driver_info[i].status = DEVCRYPTO_STATUS_FAILURE;
501	EVP_CIPHER_meth_free(known_cipher_methods[i]);
502	known_cipher_methods[i] = NULL;
503	} else {
504	cipher_driver_info[i].status = DEVCRYPTO_STATUS_USABLE;
505	#ifdef CIOCGSESSION2
506	cipher_driver_info[i].accelerated = accelerated;
507	fop.crid = sess.crid;
508	if (ioctl(cfd, CIOCFINDDEV, &fop) == 0) {
509	cipher_driver_info[i].driver_name =
510	OPENSSL_strndup(fop.name, sizeof(fop.name));
511	}
512	#elif defined(CIOCGSESSINFO)
513	siop.ses = sess.ses;
514	if (ioctl(cfd, CIOCGSESSINFO, &siop) < 0) {
515	cipher_driver_info[i].accelerated = DEVCRYPTO_ACCELERATION_UNKNOWN;
516	} else {
517	cipher_driver_info[i].driver_name =
518	OPENSSL_strndup(siop.cipher_info.cra_driver_name,
519	CRYPTODEV_MAX_ALG_NAME);
520	if (!(siop.flags & SIOP_FLAG_KERNEL_DRIVER_ONLY))
521	cipher_driver_info[i].accelerated = DEVCRYPTO_NOT_ACCELERATED;
522	else
523	cipher_driver_info[i].accelerated = DEVCRYPTO_ACCELERATED;
524	}
525	#endif /* CIOCGSESSINFO */
526	}
527	ioctl(cfd, CIOCFSESSION, &sess.ses);
528	if (devcrypto_test_cipher(i)) {
529	known_cipher_nids[known_cipher_nids_amount++] =
530	cipher_data[i].nid;
531	}
532	}
533	}
534
535	static void rebuild_known_cipher_nids(ENGINE *e)
536	{
537	size_t i;
538
539	for (i = 0, known_cipher_nids_amount = 0; i < OSSL_NELEM(cipher_data); i++) {
540	if (devcrypto_test_cipher(i))
541	known_cipher_nids[known_cipher_nids_amount++] = cipher_data[i].nid;
542	}
543	ENGINE_unregister_ciphers(e);
544	ENGINE_register_ciphers(e);
545	}
546
547	static const EVP_CIPHER *get_cipher_method(int nid)
548	{
549	size_t i = get_cipher_data_index(nid);
550
551	if (i == (size_t)-1)
552	return NULL;
553	return known_cipher_methods[i];
554	}
555
556	static int get_cipher_nids(const int **nids)
557	{
558	*nids = known_cipher_nids;
559	return known_cipher_nids_amount;
560	}
561
562	static void destroy_cipher_method(int nid)
563	{
564	size_t i = get_cipher_data_index(nid);
565
566	EVP_CIPHER_meth_free(known_cipher_methods[i]);
567	known_cipher_methods[i] = NULL;
568	}
569
570	static void destroy_all_cipher_methods(void)
571	{
572	size_t i;
573
574	for (i = 0; i < OSSL_NELEM(cipher_data); i++) {
575	destroy_cipher_method(cipher_data[i].nid);
576	OPENSSL_free(cipher_driver_info[i].driver_name);
577	cipher_driver_info[i].driver_name = NULL;
578	}
579	}
580
581	static int devcrypto_ciphers(ENGINE e, const EVP_CIPHER *cipher,
582	const int **nids, int nid)
583	{
584	if (cipher == NULL)
585	return get_cipher_nids(nids);
586
587	*cipher = get_cipher_method(nid);
588
589	return *cipher != NULL;
590	}
591
592	static void devcrypto_select_all_ciphers(int *cipher_list)
593	{
594	size_t i;
595
596	for (i = 0; i < OSSL_NELEM(cipher_data); i++)
597	cipher_list[i] = 1;
598	}
599
600	static int cryptodev_select_cipher_cb(const char str, int len, void usr)
601	{
602	int cipher_list = (int )usr;
603	char *name;
604	const EVP_CIPHER *EVP;
605	size_t i;
606
607	if (len == 0)
608	return 1;
609	if (usr == NULL \|\| (name = OPENSSL_strndup(str, len)) == NULL)
610	return 0;
611	EVP = EVP_get_cipherbyname(name);
612	if (EVP == NULL)
613	fprintf(stderr, "devcrypto: unknown cipher %s\n", name);
614	else if ((i = find_cipher_data_index(EVP_CIPHER_get_nid(EVP))) != (size_t)-1)
615	cipher_list[i] = 1;
616	else
617	fprintf(stderr, "devcrypto: cipher %s not available\n", name);
618	OPENSSL_free(name);
619	return 1;
620	}
621
622	static void dump_cipher_info(void)
623	{
624	size_t i;
625	const char *name;
626
627	fprintf (stderr, "Information about ciphers supported by the /dev/crypto"
628	" engine:\n");
629	#ifndef CIOCGSESSINFO
630	fprintf(stderr, "CIOCGSESSINFO (session info call) unavailable\n");
631	#endif
632	for (i = 0; i < OSSL_NELEM(cipher_data); i++) {
633	name = OBJ_nid2sn(cipher_data[i].nid);
634	fprintf (stderr, "Cipher %s, NID=%d, /dev/crypto info: id=%d, ",
635	name ? name : "unknown", cipher_data[i].nid,
636	cipher_data[i].devcryptoid);
637	if (cipher_driver_info[i].status == DEVCRYPTO_STATUS_NO_CIOCGSESSION ) {
638	fprintf (stderr, "CIOCGSESSION (session open call) failed\n");
639	continue;
640	}
641	fprintf (stderr, "driver=%s ", cipher_driver_info[i].driver_name ?
642	cipher_driver_info[i].driver_name : "unknown");
643	if (cipher_driver_info[i].accelerated == DEVCRYPTO_ACCELERATED)
644	fprintf(stderr, "(hw accelerated)");
645	else if (cipher_driver_info[i].accelerated == DEVCRYPTO_NOT_ACCELERATED)
646	fprintf(stderr, "(software)");
647	else
648	fprintf(stderr, "(acceleration status unknown)");
649	if (cipher_driver_info[i].status == DEVCRYPTO_STATUS_FAILURE)
650	fprintf (stderr, ". Cipher setup failed");
651	fprintf(stderr, "\n");
652	}
653	fprintf(stderr, "\n");
654	}
655
656	/*
657	* We only support digests if the cryptodev implementation supports multiple
658	* data updates and session copying. Otherwise, we would be forced to maintain
659	* a cache, which is perilous if there's a lot of data coming in (if someone
660	* wants to checksum an OpenSSL tarball, for example).
661	*/
662	#if defined(CIOCCPHASH) && defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
663	#define IMPLEMENT_DIGEST
664
665	/******************************************************************************
666	*
667	* Digests
668	*
669	* Because they all do the same basic operation, we have only one set of
670	* method functions for them all to share, and a mapping table between
671	* NIDs and cryptodev IDs, with all the necessary size data.
672	*
673	*****/
674
675	struct digest_ctx {
676	session_op_t sess;
677	/* This signals that the init function was called, not that it succeeded. */
678	int init_called;
679	unsigned char digest_res[HASH_MAX_LEN];
680	};
681
682	static const struct digest_data_st {
683	int nid;
684	int blocksize;
685	int digestlen;
686	int devcryptoid;
687	} digest_data[] = {
688	#ifndef OPENSSL_NO_MD5
689	{ NID_md5, /* MD5_CBLOCK */ 64, 16, CRYPTO_MD5 },
690	#endif
691	{ NID_sha1, SHA_CBLOCK, 20, CRYPTO_SHA1 },
692	#ifndef OPENSSL_NO_RMD160
693	# if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_RIPEMD160)
694	{ NID_ripemd160, /* RIPEMD160_CBLOCK */ 64, 20, CRYPTO_RIPEMD160 },
695	# endif
696	#endif
697	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_SHA2_224)
698	{ NID_sha224, SHA256_CBLOCK, 224 / 8, CRYPTO_SHA2_224 },
699	#endif
700	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_SHA2_256)
701	{ NID_sha256, SHA256_CBLOCK, 256 / 8, CRYPTO_SHA2_256 },
702	#endif
703	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_SHA2_384)
704	{ NID_sha384, SHA512_CBLOCK, 384 / 8, CRYPTO_SHA2_384 },
705	#endif
706	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_SHA2_512)
707	{ NID_sha512, SHA512_CBLOCK, 512 / 8, CRYPTO_SHA2_512 },
708	#endif
709	};
710
711	static size_t find_digest_data_index(int nid)
712	{
713	size_t i;
714
715	for (i = 0; i < OSSL_NELEM(digest_data); i++)
716	if (nid == digest_data[i].nid)
717	return i;
718	return (size_t)-1;
719	}
720
721	static size_t get_digest_data_index(int nid)
722	{
723	size_t i = find_digest_data_index(nid);
724
725	if (i != (size_t)-1)
726	return i;
727
728	/*
729	* Code further down must make sure that only NIDs in the table above
730	* are used. If any other NID reaches this function, there's a grave
731	* coding error further down.
732	*/
733	assert("Code that never should be reached" == NULL);
734	return -1;
735	}
736
737	static const struct digest_data_st *get_digest_data(int nid)
738	{
739	return &digest_data[get_digest_data_index(nid)];
740	}
741
742	/*
743	* Following are the five necessary functions to map OpenSSL functionality
744	* with cryptodev: init, update, final, cleanup, and copy.
745	*/
746
747	static int digest_init(EVP_MD_CTX *ctx)
748	{
749	struct digest_ctx *digest_ctx =
750	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(ctx);
751	const struct digest_data_st *digest_d =
752	get_digest_data(EVP_MD_CTX_get_type(ctx));
753
754	digest_ctx->init_called = 1;
755
756	memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess));
757	digest_ctx->sess.mac = digest_d->devcryptoid;
758	if (ioctl(cfd, CIOCGSESSION, &digest_ctx->sess) < 0) {
759	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
760	return 0;
761	}
762	return 1;
763	}
764
765	static int digest_op(struct digest_ctx ctx, const void src, size_t srclen,
766	void *res, unsigned int flags)
767	{
768	struct crypt_op cryp;
769
770	memset(&cryp, 0, sizeof(cryp));
771	cryp.ses = ctx->sess.ses;
772	cryp.len = srclen;
773	cryp.src = (void *)src;
774	cryp.dst = NULL;
775	cryp.mac = res;
776	cryp.flags = flags;
777	return ioctl(cfd, CIOCCRYPT, &cryp);
778	}
779
780	static int digest_update(EVP_MD_CTX ctx, const void data, size_t count)
781	{
782	struct digest_ctx *digest_ctx =
783	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(ctx);
784
785	if (count == 0)
786	return 1;
787
788	if (digest_ctx == NULL)
789	return 0;
790
791	if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT)) {
792	if (digest_op(digest_ctx, data, count, digest_ctx->digest_res, 0) >= 0)
793	return 1;
794	} else if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) >= 0) {
795	return 1;
796	}
797
798	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
799	return 0;
800	}
801
802	static int digest_final(EVP_MD_CTX ctx, unsigned char md)
803	{
804	struct digest_ctx *digest_ctx =
805	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(ctx);
806
807	if (md == NULL \|\| digest_ctx == NULL)
808	return 0;
809
810	if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT)) {
811	memcpy(md, digest_ctx->digest_res, EVP_MD_CTX_get_size(ctx));
812	} else if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) {
813	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
814	return 0;
815	}
816
817	return 1;
818	}
819
820	static int digest_copy(EVP_MD_CTX to, const EVP_MD_CTX from)
821	{
822	struct digest_ctx *digest_from =
823	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(from);
824	struct digest_ctx *digest_to =
825	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(to);
826	struct cphash_op cphash;
827
828	if (digest_from == NULL \|\| digest_from->init_called != 1)
829	return 1;
830
831	if (!digest_init(to)) {
832	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
833	return 0;
834	}
835
836	cphash.src_ses = digest_from->sess.ses;
837	cphash.dst_ses = digest_to->sess.ses;
838	if (ioctl(cfd, CIOCCPHASH, &cphash) < 0) {
839	ERR_raise_data(ERR_LIB_SYS, errno, "calling ioctl()");
840	return 0;
841	}
842	return 1;
843	}
844
845	static int digest_cleanup(EVP_MD_CTX *ctx)
846	{
847	struct digest_ctx *digest_ctx =
848	(struct digest_ctx *)EVP_MD_CTX_get0_md_data(ctx);
849
850	if (digest_ctx == NULL)
851	return 1;
852
853	return clean_devcrypto_session(&digest_ctx->sess);
854	}
855
856	/*
857	* Keep tables of known nids, associated methods, selected digests, and
858	* driver info.
859	* Note that known_digest_nids[] isn't necessarily indexed the same way as
860	* digest_data[] above, which the other tables are.
861	*/
862	static int known_digest_nids[OSSL_NELEM(digest_data)];
863	static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */
864	static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, };
865	static int selected_digests[OSSL_NELEM(digest_data)];
866	static struct driver_info_st digest_driver_info[OSSL_NELEM(digest_data)];
867
868	static int devcrypto_test_digest(size_t digest_data_index)
869	{
870	return (digest_driver_info[digest_data_index].status == DEVCRYPTO_STATUS_USABLE
871	&& selected_digests[digest_data_index] == 1
872	&& (digest_driver_info[digest_data_index].accelerated
873	== DEVCRYPTO_ACCELERATED
874	\|\| use_softdrivers == DEVCRYPTO_USE_SOFTWARE
875	\|\| (digest_driver_info[digest_data_index].accelerated
876	!= DEVCRYPTO_NOT_ACCELERATED
877	&& use_softdrivers == DEVCRYPTO_REJECT_SOFTWARE)));
878	}
879
880	static void rebuild_known_digest_nids(ENGINE *e)
881	{
882	size_t i;
883
884	for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data); i++) {
885	if (devcrypto_test_digest(i))
886	known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
887	}
888	ENGINE_unregister_digests(e);
889	ENGINE_register_digests(e);
890	}
891
892	static void prepare_digest_methods(void)
893	{
894	size_t i;
895	session_op_t sess1, sess2;
896	#ifdef CIOCGSESSINFO
897	struct session_info_op siop;
898	#endif
899	struct cphash_op cphash;
900
901	memset(&digest_driver_info, 0, sizeof(digest_driver_info));
902
903	memset(&sess1, 0, sizeof(sess1));
904	memset(&sess2, 0, sizeof(sess2));
905
906	for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data);
907	i++) {
908
909	selected_digests[i] = 1;
910
911	/*
912	* Check that the digest is usable
913	*/
914	sess1.mac = digest_data[i].devcryptoid;
915	sess2.ses = 0;
916	if (ioctl(cfd, CIOCGSESSION, &sess1) < 0) {
917	digest_driver_info[i].status = DEVCRYPTO_STATUS_NO_CIOCGSESSION;
918	goto finish;
919	}
920
921	#ifdef CIOCGSESSINFO
922	/* gather hardware acceleration info from the driver */
923	siop.ses = sess1.ses;
924	if (ioctl(cfd, CIOCGSESSINFO, &siop) < 0) {
925	digest_driver_info[i].accelerated = DEVCRYPTO_ACCELERATION_UNKNOWN;
926	} else {
927	digest_driver_info[i].driver_name =
928	OPENSSL_strndup(siop.hash_info.cra_driver_name,
929	CRYPTODEV_MAX_ALG_NAME);
930	if (siop.flags & SIOP_FLAG_KERNEL_DRIVER_ONLY)
931	digest_driver_info[i].accelerated = DEVCRYPTO_ACCELERATED;
932	else
933	digest_driver_info[i].accelerated = DEVCRYPTO_NOT_ACCELERATED;
934	}
935	#endif
936
937	/* digest must be capable of hash state copy */
938	sess2.mac = sess1.mac;
939	if (ioctl(cfd, CIOCGSESSION, &sess2) < 0) {
940	digest_driver_info[i].status = DEVCRYPTO_STATUS_FAILURE;
941	goto finish;
942	}
943	cphash.src_ses = sess1.ses;
944	cphash.dst_ses = sess2.ses;
945	if (ioctl(cfd, CIOCCPHASH, &cphash) < 0) {
946	digest_driver_info[i].status = DEVCRYPTO_STATUS_NO_CIOCCPHASH;
947	goto finish;
948	}
949	if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid,
950	NID_undef)) == NULL
951	\|\| !EVP_MD_meth_set_input_blocksize(known_digest_methods[i],
952	digest_data[i].blocksize)
953	\|\| !EVP_MD_meth_set_result_size(known_digest_methods[i],
954	digest_data[i].digestlen)
955	\|\| !EVP_MD_meth_set_init(known_digest_methods[i], digest_init)
956	\|\| !EVP_MD_meth_set_update(known_digest_methods[i], digest_update)
957	\|\| !EVP_MD_meth_set_final(known_digest_methods[i], digest_final)
958	\|\| !EVP_MD_meth_set_copy(known_digest_methods[i], digest_copy)
959	\|\| !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup)
960	\|\| !EVP_MD_meth_set_app_datasize(known_digest_methods[i],
961	sizeof(struct digest_ctx))) {
962	digest_driver_info[i].status = DEVCRYPTO_STATUS_FAILURE;
963	EVP_MD_meth_free(known_digest_methods[i]);
964	known_digest_methods[i] = NULL;
965	goto finish;
966	}
967	digest_driver_info[i].status = DEVCRYPTO_STATUS_USABLE;
968	finish:
969	ioctl(cfd, CIOCFSESSION, &sess1.ses);
970	if (sess2.ses != 0)
971	ioctl(cfd, CIOCFSESSION, &sess2.ses);
972	if (devcrypto_test_digest(i))
973	known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
974	}
975	}
976
977	static const EVP_MD *get_digest_method(int nid)
978	{
979	size_t i = get_digest_data_index(nid);
980
981	if (i == (size_t)-1)
982	return NULL;
983	return known_digest_methods[i];
984	}
985
986	static int get_digest_nids(const int **nids)
987	{
988	*nids = known_digest_nids;
989	return known_digest_nids_amount;
990	}
991
992	static void destroy_digest_method(int nid)
993	{
994	size_t i = get_digest_data_index(nid);
995
996	EVP_MD_meth_free(known_digest_methods[i]);
997	known_digest_methods[i] = NULL;
998	}
999
1000	static void destroy_all_digest_methods(void)
1001	{
1002	size_t i;
1003
1004	for (i = 0; i < OSSL_NELEM(digest_data); i++) {
1005	destroy_digest_method(digest_data[i].nid);
1006	OPENSSL_free(digest_driver_info[i].driver_name);
1007	digest_driver_info[i].driver_name = NULL;
1008	}
1009	}
1010
1011	static int devcrypto_digests(ENGINE e, const EVP_MD *digest,
1012	const int **nids, int nid)
1013	{
1014	if (digest == NULL)
1015	return get_digest_nids(nids);
1016
1017	*digest = get_digest_method(nid);
1018
1019	return *digest != NULL;
1020	}
1021
1022	static void devcrypto_select_all_digests(int *digest_list)
1023	{
1024	size_t i;
1025
1026	for (i = 0; i < OSSL_NELEM(digest_data); i++)
1027	digest_list[i] = 1;
1028	}
1029
1030	static int cryptodev_select_digest_cb(const char str, int len, void usr)
1031	{
1032	int digest_list = (int )usr;
1033	char *name;
1034	const EVP_MD *EVP;
1035	size_t i;
1036
1037	if (len == 0)
1038	return 1;
1039	if (usr == NULL \|\| (name = OPENSSL_strndup(str, len)) == NULL)
1040	return 0;
1041	EVP = EVP_get_digestbyname(name);
1042	if (EVP == NULL)
1043	fprintf(stderr, "devcrypto: unknown digest %s\n", name);
1044	else if ((i = find_digest_data_index(EVP_MD_get_type(EVP))) != (size_t)-1)
1045	digest_list[i] = 1;
1046	else
1047	fprintf(stderr, "devcrypto: digest %s not available\n", name);
1048	OPENSSL_free(name);
1049	return 1;
1050	}
1051
1052	static void dump_digest_info(void)
1053	{
1054	size_t i;
1055	const char *name;
1056
1057	fprintf (stderr, "Information about digests supported by the /dev/crypto"
1058	" engine:\n");
1059	#ifndef CIOCGSESSINFO
1060	fprintf(stderr, "CIOCGSESSINFO (session info call) unavailable\n");
1061	#endif
1062
1063	for (i = 0; i < OSSL_NELEM(digest_data); i++) {
1064	name = OBJ_nid2sn(digest_data[i].nid);
1065	fprintf (stderr, "Digest %s, NID=%d, /dev/crypto info: id=%d, driver=%s",
1066	name ? name : "unknown", digest_data[i].nid,
1067	digest_data[i].devcryptoid,
1068	digest_driver_info[i].driver_name ? digest_driver_info[i].driver_name : "unknown");
1069	if (digest_driver_info[i].status == DEVCRYPTO_STATUS_NO_CIOCGSESSION) {
1070	fprintf (stderr, ". CIOCGSESSION (session open) failed\n");
1071	continue;
1072	}
1073	if (digest_driver_info[i].accelerated == DEVCRYPTO_ACCELERATED)
1074	fprintf(stderr, " (hw accelerated)");
1075	else if (digest_driver_info[i].accelerated == DEVCRYPTO_NOT_ACCELERATED)
1076	fprintf(stderr, " (software)");
1077	else
1078	fprintf(stderr, " (acceleration status unknown)");
1079	if (cipher_driver_info[i].status == DEVCRYPTO_STATUS_FAILURE)
1080	fprintf (stderr, ". Cipher setup failed\n");
1081	else if (digest_driver_info[i].status == DEVCRYPTO_STATUS_NO_CIOCCPHASH)
1082	fprintf(stderr, ", CIOCCPHASH failed\n");
1083	else
1084	fprintf(stderr, ", CIOCCPHASH capable\n");
1085	}
1086	fprintf(stderr, "\n");
1087	}
1088
1089	#endif
1090
1091	/******************************************************************************
1092	*
1093	* CONTROL COMMANDS
1094	*
1095	*****/
1096
1097	#define DEVCRYPTO_CMD_USE_SOFTDRIVERS ENGINE_CMD_BASE
1098	#define DEVCRYPTO_CMD_CIPHERS (ENGINE_CMD_BASE + 1)
1099	#define DEVCRYPTO_CMD_DIGESTS (ENGINE_CMD_BASE + 2)
1100	#define DEVCRYPTO_CMD_DUMP_INFO (ENGINE_CMD_BASE + 3)
1101
1102	static const ENGINE_CMD_DEFN devcrypto_cmds[] = {
1103	#if defined(CIOCGSESSINFO) \|\| defined(CIOCGSESSION2)
1104	{DEVCRYPTO_CMD_USE_SOFTDRIVERS,
1105	"USE_SOFTDRIVERS",
1106	"specifies whether to use software (not accelerated) drivers ("
1107	OPENSSL_MSTR(DEVCRYPTO_REQUIRE_ACCELERATED) "=use only accelerated drivers, "
1108	OPENSSL_MSTR(DEVCRYPTO_USE_SOFTWARE) "=allow all drivers, "
1109	OPENSSL_MSTR(DEVCRYPTO_REJECT_SOFTWARE)
1110	"=use if acceleration can't be determined) [default="
1111	OPENSSL_MSTR(DEVCRYPTO_DEFAULT_USE_SOFTDRIVERS) "]",
1112	ENGINE_CMD_FLAG_NUMERIC},
1113	#endif
1114
1115	{DEVCRYPTO_CMD_CIPHERS,
1116	"CIPHERS",
1117	"either ALL, NONE, or a comma-separated list of ciphers to enable [default=ALL]",
1118	ENGINE_CMD_FLAG_STRING},
1119
1120	#ifdef IMPLEMENT_DIGEST
1121	{DEVCRYPTO_CMD_DIGESTS,
1122	"DIGESTS",
1123	"either ALL, NONE, or a comma-separated list of digests to enable [default=ALL]",
1124	ENGINE_CMD_FLAG_STRING},
1125	#endif
1126
1127	{DEVCRYPTO_CMD_DUMP_INFO,
1128	"DUMP_INFO",
1129	"dump info about each algorithm to stderr; use 'openssl engine -pre DUMP_INFO devcrypto'",
1130	ENGINE_CMD_FLAG_NO_INPUT},
1131
1132	{0, NULL, NULL, 0}
1133	};
1134
1135	static int devcrypto_ctrl(ENGINE e, int cmd, long i, void p, void (*f) (void))
1136	{
1137	int *new_list;
1138	switch (cmd) {
1139	#if defined(CIOCGSESSINFO) \|\| defined(CIOCGSESSION2)
1140	case DEVCRYPTO_CMD_USE_SOFTDRIVERS:
1141	switch (i) {
1142	case DEVCRYPTO_REQUIRE_ACCELERATED:
1143	case DEVCRYPTO_USE_SOFTWARE:
1144	case DEVCRYPTO_REJECT_SOFTWARE:
1145	break;
1146	default:
1147	fprintf(stderr, "devcrypto: invalid value (%ld) for USE_SOFTDRIVERS\n", i);
1148	return 0;
1149	}
1150	if (use_softdrivers == i)
1151	return 1;
1152	use_softdrivers = i;
1153	#ifdef IMPLEMENT_DIGEST
1154	rebuild_known_digest_nids(e);
1155	#endif
1156	rebuild_known_cipher_nids(e);
1157	return 1;
1158	#endif /* CIOCGSESSINFO \|\| CIOCGSESSION2 */
1159
1160	case DEVCRYPTO_CMD_CIPHERS:
1161	if (p == NULL)
1162	return 1;
1163	if (OPENSSL_strcasecmp((const char *)p, "ALL") == 0) {
1164	devcrypto_select_all_ciphers(selected_ciphers);
1165	} else if (OPENSSL_strcasecmp((const char*)p, "NONE") == 0) {
1166	memset(selected_ciphers, 0, sizeof(selected_ciphers));
1167	} else {
1168	new_list=OPENSSL_zalloc(sizeof(selected_ciphers));
1169	if (!CONF_parse_list(p, ',', 1, cryptodev_select_cipher_cb, new_list)) {
1170	OPENSSL_free(new_list);
1171	return 0;
1172	}
1173	memcpy(selected_ciphers, new_list, sizeof(selected_ciphers));
1174	OPENSSL_free(new_list);
1175	}
1176	rebuild_known_cipher_nids(e);
1177	return 1;
1178
1179	#ifdef IMPLEMENT_DIGEST
1180	case DEVCRYPTO_CMD_DIGESTS:
1181	if (p == NULL)
1182	return 1;
1183	if (OPENSSL_strcasecmp((const char *)p, "ALL") == 0) {
1184	devcrypto_select_all_digests(selected_digests);
1185	} else if (OPENSSL_strcasecmp((const char*)p, "NONE") == 0) {
1186	memset(selected_digests, 0, sizeof(selected_digests));
1187	} else {
1188	new_list=OPENSSL_zalloc(sizeof(selected_digests));
1189	if (!CONF_parse_list(p, ',', 1, cryptodev_select_digest_cb, new_list)) {
1190	OPENSSL_free(new_list);
1191	return 0;
1192	}
1193	memcpy(selected_digests, new_list, sizeof(selected_digests));
1194	OPENSSL_free(new_list);
1195	}
1196	rebuild_known_digest_nids(e);
1197	return 1;
1198	#endif /* IMPLEMENT_DIGEST */
1199
1200	case DEVCRYPTO_CMD_DUMP_INFO:
1201	dump_cipher_info();
1202	#ifdef IMPLEMENT_DIGEST
1203	dump_digest_info();
1204	#endif
1205	return 1;
1206
1207	default:
1208	break;
1209	}
1210	return 0;
1211	}
1212
1213	/******************************************************************************
1214	*
1215	* LOAD / UNLOAD
1216	*
1217	*****/
1218
1219	/*
1220	* Opens /dev/crypto
1221	*/
1222	static int open_devcrypto(void)
1223	{
1224	int fd;
1225
1226	if (cfd >= 0)
1227	return 1;
1228
1229	if ((fd = open("/dev/crypto", O_RDWR, 0)) < 0) {
1230	#ifndef ENGINE_DEVCRYPTO_DEBUG
1231	if (errno != ENOENT)
1232	#endif
1233	fprintf(stderr, "Could not open /dev/crypto: %s\n", strerror(errno));
1234	return 0;
1235	}
1236
1237	#ifdef CRIOGET
1238	if (ioctl(fd, CRIOGET, &cfd) < 0) {
1239	fprintf(stderr, "Could not create crypto fd: %s\n", strerror(errno));
1240	close(fd);
1241	cfd = -1;
1242	return 0;
1243	}
1244	close(fd);
1245	#else
1246	cfd = fd;
1247	#endif
1248
1249	return 1;
1250	}
1251
1252	static int close_devcrypto(void)
1253	{
1254	int ret;
1255
1256	if (cfd < 0)
1257	return 1;
1258	ret = close(cfd);
1259	cfd = -1;
1260	if (ret != 0) {
1261	fprintf(stderr, "Error closing /dev/crypto: %s\n", strerror(errno));
1262	return 0;
1263	}
1264	return 1;
1265	}
1266
1267	static int devcrypto_unload(ENGINE *e)
1268	{
1269	destroy_all_cipher_methods();
1270	#ifdef IMPLEMENT_DIGEST
1271	destroy_all_digest_methods();
1272	#endif
1273
1274	close_devcrypto();
1275
1276	return 1;
1277	}
1278
1279	static int bind_devcrypto(ENGINE *e) {
1280
1281	if (!ENGINE_set_id(e, engine_devcrypto_id)
1282	\|\| !ENGINE_set_name(e, "/dev/crypto engine")
1283	\|\| !ENGINE_set_destroy_function(e, devcrypto_unload)
1284	\|\| !ENGINE_set_cmd_defns(e, devcrypto_cmds)
1285	\|\| !ENGINE_set_ctrl_function(e, devcrypto_ctrl))
1286	return 0;
1287
1288	prepare_cipher_methods();
1289	#ifdef IMPLEMENT_DIGEST
1290	prepare_digest_methods();
1291	#endif
1292
1293	return (ENGINE_set_ciphers(e, devcrypto_ciphers)
1294	#ifdef IMPLEMENT_DIGEST
1295	&& ENGINE_set_digests(e, devcrypto_digests)
1296	#endif
1297	/*
1298	* Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD
1299	* implementations, it seems to only exist in FreeBSD, and regarding the
1300	* parameters in its crypt_kop, the manual crypto(4) has this to say:
1301	*
1302	* The semantics of these arguments are currently undocumented.
1303	*
1304	* Reading through the FreeBSD source code doesn't give much more than
1305	* their CRK_MOD_EXP implementation for ubsec.
1306	*
1307	* It doesn't look much better with cryptodev-linux. They have the crypt_kop
1308	* structure as well as the command (CRK_*) in cryptodev.h, but no support
1309	* seems to be implemented at all for the moment.
1310	*
1311	* At the time of writing, it seems impossible to write proper support for
1312	* FreeBSD's asym features without some very deep knowledge and access to
1313	* specific kernel modules.
1314	*
1315	* /Richard Levitte, 2017-05-11
1316	*/
1317	#if 0
1318	&& ENGINE_set_RSA(e, devcrypto_rsa)
1319	# ifndef OPENSSL_NO_DSA
1320	&& ENGINE_set_DSA(e, devcrypto_dsa)
1321	# endif
1322	# ifndef OPENSSL_NO_DH
1323	&& ENGINE_set_DH(e, devcrypto_dh)
1324	# endif
1325	# ifndef OPENSSL_NO_EC
1326	&& ENGINE_set_EC(e, devcrypto_ec)
1327	# endif
1328	#endif
1329	);
1330	}
1331
1332	#ifdef OPENSSL_NO_DYNAMIC_ENGINE
1333	/*
1334	* In case this engine is built into libcrypto, then it doesn't offer any
1335	* ability to be dynamically loadable.
1336	*/
1337	void engine_load_devcrypto_int(void)
1338	{
1339	ENGINE *e = NULL;
1340
1341	if (!open_devcrypto())
1342	return;
1343
1344	if ((e = ENGINE_new()) == NULL
1345	\|\| !bind_devcrypto(e)) {
1346	close_devcrypto();
1347	ENGINE_free(e);
1348	return;
1349	}
1350
1351	ERR_set_mark();
1352	ENGINE_add(e);
1353	/*
1354	* If the "add" worked, it gets a structural reference. So either way, we
1355	* release our just-created reference.
1356	*/
1357	ENGINE_free(e); /* Loose our local reference */
1358	/*
1359	* If the "add" didn't work, it was probably a conflict because it was
1360	* already added (eg. someone calling ENGINE_load_blah then calling
1361	* ENGINE_load_builtin_engines() perhaps).
1362	*/
1363	ERR_pop_to_mark();
1364	}
1365
1366	#else
1367
1368	static int bind_helper(ENGINE e, const char id)
1369	{
1370	if ((id && (strcmp(id, engine_devcrypto_id) != 0))
1371	\|\| !open_devcrypto())
1372	return 0;
1373	if (!bind_devcrypto(e)) {
1374	close_devcrypto();
1375	return 0;
1376	}
1377	return 1;
1378	}
1379
1380	IMPLEMENT_DYNAMIC_CHECK_FN()
1381	IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
1382
1383	#endif

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source: vbox/trunk/src/libs/openssl-3.1.7/engines/e_devcrypto.c@ 106165

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