2 * Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
12 #include <sys/types.h>
15 #include <sys/ioctl.h>
19 #include <openssl/evp.h>
20 #include <openssl/err.h>
21 #include <openssl/engine.h>
22 #include <openssl/objects.h>
23 #include <crypto/cryptodev.h>
25 #include "internal/engine.h"
27 /* #define ENGINE_DEVCRYPTO_DEBUG */
29 #ifdef CRYPTO_ALGORITHM_MIN
30 # define CHECK_BSD_STYLE_MACROS
34 * ONE global file descriptor for all sessions. This allows operations
35 * such as digest session data copying (see digest_copy()), but is also
36 * saner... why re-open /dev/crypto for every session?
40 static int clean_devcrypto_session(struct session_op *sess) {
41 if (ioctl(cfd, CIOCFSESSION, &sess->ses) < 0) {
42 SYSerr(SYS_F_IOCTL, errno);
45 memset(sess, 0, sizeof(struct session_op));
49 /******************************************************************************
53 * Because they all do the same basic operation, we have only one set of
54 * method functions for them all to share, and a mapping table between
55 * NIDs and cryptodev IDs, with all the necessary size data.
60 struct session_op sess;
61 int op; /* COP_ENCRYPT or COP_DECRYPT */
62 unsigned long mode; /* EVP_CIPH_*_MODE */
64 /* to handle ctr mode being a stream cipher */
65 unsigned char partial[EVP_MAX_BLOCK_LENGTH];
66 unsigned int blocksize, num;
69 static const struct cipher_data_st {
77 #ifndef OPENSSL_NO_DES
78 { NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC },
79 { NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC },
82 { NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC },
84 #ifndef OPENSSL_NO_CAST
85 { NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC },
87 { NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
88 { NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
89 { NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
90 #ifndef OPENSSL_NO_RC4
91 { NID_rc4, 1, 16, 0, EVP_CIPH_STREAM_CIPHER, CRYPTO_ARC4 },
93 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_CTR)
94 { NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
95 { NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
96 { NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
98 #if 0 /* Not yet supported */
99 { NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
100 { NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
102 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_ECB)
103 { NID_aes_128_ecb, 16, 128 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
104 { NID_aes_192_ecb, 16, 192 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
105 { NID_aes_256_ecb, 16, 256 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
107 #if 0 /* Not yet supported */
108 { NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
109 { NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
110 { NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
112 #ifndef OPENSSL_NO_CAMELLIA
113 { NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE,
114 CRYPTO_CAMELLIA_CBC },
115 { NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE,
116 CRYPTO_CAMELLIA_CBC },
117 { NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE,
118 CRYPTO_CAMELLIA_CBC },
122 static size_t get_cipher_data_index(int nid)
126 for (i = 0; i < OSSL_NELEM(cipher_data); i++)
127 if (nid == cipher_data[i].nid)
131 * Code further down must make sure that only NIDs in the table above
132 * are used. If any other NID reaches this function, there's a grave
133 * coding error further down.
135 assert("Code that never should be reached" == NULL);
139 static const struct cipher_data_st *get_cipher_data(int nid)
141 return &cipher_data[get_cipher_data_index(nid)];
145 * Following are the three necessary functions to map OpenSSL functionality
149 static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
150 const unsigned char *iv, int enc)
152 struct cipher_ctx *cipher_ctx =
153 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
154 const struct cipher_data_st *cipher_d =
155 get_cipher_data(EVP_CIPHER_CTX_nid(ctx));
157 /* cleanup a previous session */
158 if (cipher_ctx->sess.ses != 0 &&
159 clean_devcrypto_session(&cipher_ctx->sess) == 0)
162 cipher_ctx->sess.cipher = cipher_d->devcryptoid;
163 cipher_ctx->sess.keylen = cipher_d->keylen;
164 cipher_ctx->sess.key = (void *)key;
165 cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT;
166 cipher_ctx->mode = cipher_d->flags & EVP_CIPH_MODE;
167 cipher_ctx->blocksize = cipher_d->blocksize;
168 if (ioctl(cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) {
169 SYSerr(SYS_F_IOCTL, errno);
176 static int cipher_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
177 const unsigned char *in, size_t inl)
179 struct cipher_ctx *cipher_ctx =
180 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
181 struct crypt_op cryp;
182 unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
183 #if !defined(COP_FLAG_WRITE_IV)
184 unsigned char saved_iv[EVP_MAX_IV_LENGTH];
185 const unsigned char *ivptr;
186 size_t nblocks, ivlen;
189 memset(&cryp, 0, sizeof(cryp));
190 cryp.ses = cipher_ctx->sess.ses;
192 cryp.src = (void *)in;
193 cryp.dst = (void *)out;
194 cryp.iv = (void *)iv;
195 cryp.op = cipher_ctx->op;
196 #if !defined(COP_FLAG_WRITE_IV)
199 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
201 switch (cipher_ctx->mode) {
202 case EVP_CIPH_CBC_MODE:
203 assert(inl >= ivlen);
204 if (!EVP_CIPHER_CTX_encrypting(ctx)) {
205 ivptr = in + inl - ivlen;
206 memcpy(saved_iv, ivptr, ivlen);
210 case EVP_CIPH_CTR_MODE:
213 default: /* should not happen */
217 cryp.flags = COP_FLAG_WRITE_IV;
220 if (ioctl(cfd, CIOCCRYPT, &cryp) < 0) {
221 SYSerr(SYS_F_IOCTL, errno);
225 #if !defined(COP_FLAG_WRITE_IV)
227 switch (cipher_ctx->mode) {
228 case EVP_CIPH_CBC_MODE:
229 assert(inl >= ivlen);
230 if (EVP_CIPHER_CTX_encrypting(ctx))
231 ivptr = out + inl - ivlen;
235 memcpy(iv, ivptr, ivlen);
238 case EVP_CIPH_CTR_MODE:
239 nblocks = (inl + cipher_ctx->blocksize - 1)
240 / cipher_ctx->blocksize;
243 nblocks += iv[ivlen];
244 iv[ivlen] = (uint8_t) nblocks;
249 default: /* should not happen */
257 static int ctr_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
258 const unsigned char *in, size_t inl)
260 struct cipher_ctx *cipher_ctx =
261 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
264 /* initial partial block */
265 while (cipher_ctx->num && inl) {
266 (*out++) = *(in++) ^ cipher_ctx->partial[cipher_ctx->num];
268 cipher_ctx->num = (cipher_ctx->num + 1) % cipher_ctx->blocksize;
272 if (inl > (unsigned int) cipher_ctx->blocksize) {
273 nblocks = inl/cipher_ctx->blocksize;
274 len = nblocks * cipher_ctx->blocksize;
275 if (cipher_do_cipher(ctx, out, in, len) < 1)
282 /* final partial block */
284 memset(cipher_ctx->partial, 0, cipher_ctx->blocksize);
285 if (cipher_do_cipher(ctx, cipher_ctx->partial, cipher_ctx->partial,
286 cipher_ctx->blocksize) < 1)
289 out[cipher_ctx->num] = in[cipher_ctx->num]
290 ^ cipher_ctx->partial[cipher_ctx->num];
298 static int cipher_ctrl(EVP_CIPHER_CTX *ctx, int type, int p1, void* p2)
300 struct cipher_ctx *cipher_ctx =
301 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
302 EVP_CIPHER_CTX *to_ctx = (EVP_CIPHER_CTX *)p2;
303 struct cipher_ctx *to_cipher_ctx;
307 if (cipher_ctx == NULL)
309 /* when copying the context, a new session needs to be initialized */
311 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(to_ctx);
312 memset(&to_cipher_ctx->sess, 0, sizeof(to_cipher_ctx->sess));
313 return cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
314 (cipher_ctx->op == COP_ENCRYPT));
317 memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
327 static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
329 struct cipher_ctx *cipher_ctx =
330 (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
332 return clean_devcrypto_session(&cipher_ctx->sess);
336 * Keep a table of known nids and associated methods.
337 * Note that known_cipher_nids[] isn't necessarily indexed the same way as
338 * cipher_data[] above, which known_cipher_methods[] is.
340 static int known_cipher_nids[OSSL_NELEM(cipher_data)];
341 static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
342 static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };
344 static void prepare_cipher_methods(void)
347 struct session_op sess;
348 unsigned long cipher_mode;
350 memset(&sess, 0, sizeof(sess));
351 sess.key = (void *)"01234567890123456789012345678901234567890123456789";
353 for (i = 0, known_cipher_nids_amount = 0;
354 i < OSSL_NELEM(cipher_data); i++) {
357 * Check that the algo is really availably by trying to open and close
360 sess.cipher = cipher_data[i].devcryptoid;
361 sess.keylen = cipher_data[i].keylen;
362 if (ioctl(cfd, CIOCGSESSION, &sess) < 0
363 || ioctl(cfd, CIOCFSESSION, &sess.ses) < 0)
366 cipher_mode = cipher_data[i].flags & EVP_CIPH_MODE;
368 if ((known_cipher_methods[i] =
369 EVP_CIPHER_meth_new(cipher_data[i].nid,
370 cipher_mode == EVP_CIPH_CTR_MODE ? 1 :
371 cipher_data[i].blocksize,
372 cipher_data[i].keylen)) == NULL
373 || !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
374 cipher_data[i].ivlen)
375 || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
377 | EVP_CIPH_CUSTOM_COPY
379 | EVP_CIPH_FLAG_DEFAULT_ASN1)
380 || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
381 || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
382 cipher_mode == EVP_CIPH_CTR_MODE ?
385 || !EVP_CIPHER_meth_set_ctrl(known_cipher_methods[i], cipher_ctrl)
386 || !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i],
388 || !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i],
389 sizeof(struct cipher_ctx))) {
390 EVP_CIPHER_meth_free(known_cipher_methods[i]);
391 known_cipher_methods[i] = NULL;
393 known_cipher_nids[known_cipher_nids_amount++] =
399 static const EVP_CIPHER *get_cipher_method(int nid)
401 size_t i = get_cipher_data_index(nid);
405 return known_cipher_methods[i];
408 static int get_cipher_nids(const int **nids)
410 *nids = known_cipher_nids;
411 return known_cipher_nids_amount;
414 static void destroy_cipher_method(int nid)
416 size_t i = get_cipher_data_index(nid);
418 EVP_CIPHER_meth_free(known_cipher_methods[i]);
419 known_cipher_methods[i] = NULL;
422 static void destroy_all_cipher_methods(void)
426 for (i = 0; i < OSSL_NELEM(cipher_data); i++)
427 destroy_cipher_method(cipher_data[i].nid);
430 static int devcrypto_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
431 const int **nids, int nid)
434 return get_cipher_nids(nids);
436 *cipher = get_cipher_method(nid);
438 return *cipher != NULL;
442 * We only support digests if the cryptodev implementation supports multiple
443 * data updates and session copying. Otherwise, we would be forced to maintain
444 * a cache, which is perilous if there's a lot of data coming in (if someone
445 * wants to checksum an OpenSSL tarball, for example).
447 #if defined(CIOCCPHASH) && defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
448 #define IMPLEMENT_DIGEST
450 /******************************************************************************
454 * Because they all do the same basic operation, we have only one set of
455 * method functions for them all to share, and a mapping table between
456 * NIDs and cryptodev IDs, with all the necessary size data.
461 struct session_op sess;
462 /* This signals that the init function was called, not that it succeeded. */
466 static const struct digest_data_st {
472 #ifndef OPENSSL_NO_MD5
473 { NID_md5, /* MD5_CBLOCK */ 64, 16, CRYPTO_MD5 },
475 { NID_sha1, SHA_CBLOCK, 20, CRYPTO_SHA1 },
476 #ifndef OPENSSL_NO_RMD160
477 # if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_RIPEMD160)
478 { NID_ripemd160, /* RIPEMD160_CBLOCK */ 64, 20, CRYPTO_RIPEMD160 },
481 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_224)
482 { NID_sha224, SHA256_CBLOCK, 224 / 8, CRYPTO_SHA2_224 },
484 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_256)
485 { NID_sha256, SHA256_CBLOCK, 256 / 8, CRYPTO_SHA2_256 },
487 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_384)
488 { NID_sha384, SHA512_CBLOCK, 384 / 8, CRYPTO_SHA2_384 },
490 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_512)
491 { NID_sha512, SHA512_CBLOCK, 512 / 8, CRYPTO_SHA2_512 },
495 static size_t get_digest_data_index(int nid)
499 for (i = 0; i < OSSL_NELEM(digest_data); i++)
500 if (nid == digest_data[i].nid)
504 * Code further down must make sure that only NIDs in the table above
505 * are used. If any other NID reaches this function, there's a grave
506 * coding error further down.
508 assert("Code that never should be reached" == NULL);
512 static const struct digest_data_st *get_digest_data(int nid)
514 return &digest_data[get_digest_data_index(nid)];
518 * Following are the four necessary functions to map OpenSSL functionality
522 static int digest_init(EVP_MD_CTX *ctx)
524 struct digest_ctx *digest_ctx =
525 (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
526 const struct digest_data_st *digest_d =
527 get_digest_data(EVP_MD_CTX_type(ctx));
529 digest_ctx->init_called = 1;
531 memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess));
532 digest_ctx->sess.mac = digest_d->devcryptoid;
533 if (ioctl(cfd, CIOCGSESSION, &digest_ctx->sess) < 0) {
534 SYSerr(SYS_F_IOCTL, errno);
541 static int digest_op(struct digest_ctx *ctx, const void *src, size_t srclen,
542 void *res, unsigned int flags)
544 struct crypt_op cryp;
546 memset(&cryp, 0, sizeof(cryp));
547 cryp.ses = ctx->sess.ses;
549 cryp.src = (void *)src;
553 return ioctl(cfd, CIOCCRYPT, &cryp);
556 static int digest_update(EVP_MD_CTX *ctx, const void *data, size_t count)
558 struct digest_ctx *digest_ctx =
559 (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
564 if (digest_ctx == NULL)
567 if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) {
568 SYSerr(SYS_F_IOCTL, errno);
575 static int digest_final(EVP_MD_CTX *ctx, unsigned char *md)
577 struct digest_ctx *digest_ctx =
578 (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
580 if (md == NULL || digest_ctx == NULL)
582 if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) {
583 SYSerr(SYS_F_IOCTL, errno);
590 static int digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
592 struct digest_ctx *digest_from =
593 (struct digest_ctx *)EVP_MD_CTX_md_data(from);
594 struct digest_ctx *digest_to =
595 (struct digest_ctx *)EVP_MD_CTX_md_data(to);
596 struct cphash_op cphash;
598 if (digest_from == NULL || digest_from->init_called != 1)
601 if (!digest_init(to)) {
602 SYSerr(SYS_F_IOCTL, errno);
606 cphash.src_ses = digest_from->sess.ses;
607 cphash.dst_ses = digest_to->sess.ses;
608 if (ioctl(cfd, CIOCCPHASH, &cphash) < 0) {
609 SYSerr(SYS_F_IOCTL, errno);
615 static int digest_cleanup(EVP_MD_CTX *ctx)
617 struct digest_ctx *digest_ctx =
618 (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
620 if (digest_ctx == NULL)
623 return clean_devcrypto_session(&digest_ctx->sess);
626 static int devcrypto_test_digest(size_t digest_data_index)
628 struct session_op sess1, sess2;
629 struct cphash_op cphash;
632 memset(&sess1, 0, sizeof(sess1));
633 memset(&sess2, 0, sizeof(sess2));
634 sess1.mac = digest_data[digest_data_index].devcryptoid;
635 if (ioctl(cfd, CIOCGSESSION, &sess1) < 0)
637 /* Make sure the driver is capable of hash state copy */
638 sess2.mac = sess1.mac;
639 if (ioctl(cfd, CIOCGSESSION, &sess2) >= 0) {
640 cphash.src_ses = sess1.ses;
641 cphash.dst_ses = sess2.ses;
642 if (ioctl(cfd, CIOCCPHASH, &cphash) >= 0)
644 ioctl(cfd, CIOCFSESSION, &sess2.ses);
646 ioctl(cfd, CIOCFSESSION, &sess1.ses);
651 * Keep a table of known nids and associated methods.
652 * Note that known_digest_nids[] isn't necessarily indexed the same way as
653 * digest_data[] above, which known_digest_methods[] is.
655 static int known_digest_nids[OSSL_NELEM(digest_data)];
656 static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */
657 static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, };
659 static void prepare_digest_methods(void)
663 for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data);
667 * Check that the algo is usable
669 if (!devcrypto_test_digest(i))
672 if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid,
674 || !EVP_MD_meth_set_input_blocksize(known_digest_methods[i],
675 digest_data[i].blocksize)
676 || !EVP_MD_meth_set_result_size(known_digest_methods[i],
677 digest_data[i].digestlen)
678 || !EVP_MD_meth_set_init(known_digest_methods[i], digest_init)
679 || !EVP_MD_meth_set_update(known_digest_methods[i], digest_update)
680 || !EVP_MD_meth_set_final(known_digest_methods[i], digest_final)
681 || !EVP_MD_meth_set_copy(known_digest_methods[i], digest_copy)
682 || !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup)
683 || !EVP_MD_meth_set_app_datasize(known_digest_methods[i],
684 sizeof(struct digest_ctx))) {
685 EVP_MD_meth_free(known_digest_methods[i]);
686 known_digest_methods[i] = NULL;
688 known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
693 static const EVP_MD *get_digest_method(int nid)
695 size_t i = get_digest_data_index(nid);
699 return known_digest_methods[i];
702 static int get_digest_nids(const int **nids)
704 *nids = known_digest_nids;
705 return known_digest_nids_amount;
708 static void destroy_digest_method(int nid)
710 size_t i = get_digest_data_index(nid);
712 EVP_MD_meth_free(known_digest_methods[i]);
713 known_digest_methods[i] = NULL;
716 static void destroy_all_digest_methods(void)
720 for (i = 0; i < OSSL_NELEM(digest_data); i++)
721 destroy_digest_method(digest_data[i].nid);
724 static int devcrypto_digests(ENGINE *e, const EVP_MD **digest,
725 const int **nids, int nid)
728 return get_digest_nids(nids);
730 *digest = get_digest_method(nid);
732 return *digest != NULL;
737 /******************************************************************************
743 static int devcrypto_unload(ENGINE *e)
745 destroy_all_cipher_methods();
746 #ifdef IMPLEMENT_DIGEST
747 destroy_all_digest_methods();
755 * This engine is always built into libcrypto, so it doesn't offer any
756 * ability to be dynamically loadable.
758 void engine_load_devcrypto_int()
762 if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
763 #ifndef ENGINE_DEVCRYPTO_DEBUG
766 fprintf(stderr, "Could not open /dev/crypto: %s\n", strerror(errno));
770 if ((e = ENGINE_new()) == NULL
771 || !ENGINE_set_destroy_function(e, devcrypto_unload)) {
774 * We know that devcrypto_unload() won't be called when one of the
775 * above two calls have failed, so we close cfd explicitly here to
776 * avoid leaking resources.
782 prepare_cipher_methods();
783 #ifdef IMPLEMENT_DIGEST
784 prepare_digest_methods();
787 if (!ENGINE_set_id(e, "devcrypto")
788 || !ENGINE_set_name(e, "/dev/crypto engine")
791 * Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD
792 * implementations, it seems to only exist in FreeBSD, and regarding the
793 * parameters in its crypt_kop, the manual crypto(4) has this to say:
795 * The semantics of these arguments are currently undocumented.
797 * Reading through the FreeBSD source code doesn't give much more than
798 * their CRK_MOD_EXP implementation for ubsec.
800 * It doesn't look much better with cryptodev-linux. They have the crypt_kop
801 * structure as well as the command (CRK_*) in cryptodev.h, but no support
802 * seems to be implemented at all for the moment.
804 * At the time of writing, it seems impossible to write proper support for
805 * FreeBSD's asym features without some very deep knowledge and access to
806 * specific kernel modules.
808 * /Richard Levitte, 2017-05-11
811 # ifndef OPENSSL_NO_RSA
812 || !ENGINE_set_RSA(e, devcrypto_rsa)
814 # ifndef OPENSSL_NO_DSA
815 || !ENGINE_set_DSA(e, devcrypto_dsa)
817 # ifndef OPENSSL_NO_DH
818 || !ENGINE_set_DH(e, devcrypto_dh)
820 # ifndef OPENSSL_NO_EC
821 || !ENGINE_set_EC(e, devcrypto_ec)
824 || !ENGINE_set_ciphers(e, devcrypto_ciphers)
825 #ifdef IMPLEMENT_DIGEST
826 || !ENGINE_set_digests(e, devcrypto_digests)
834 ENGINE_free(e); /* Loose our local reference */