2 * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* We need to use some deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
13 /* Required for vmsplice */
21 #include <openssl/engine.h>
22 #include <openssl/async.h>
23 #include <openssl/err.h>
24 #include "internal/nelem.h"
26 #include <sys/socket.h>
27 #include <linux/version.h>
31 #if LINUX_VERSION_CODE < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \
34 # warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
35 # warning "Skipping Compilation of AFALG engine"
37 void engine_load_afalg_int(void);
38 void engine_load_afalg_int(void)
43 # include <linux/if_alg.h>
45 # include <sys/utsname.h>
47 # include <linux/aio_abi.h>
48 # include <sys/syscall.h>
52 # include "e_afalg_err.c"
59 # ifndef SPLICE_F_GIFT
60 # define SPLICE_F_GIFT (0x08)
64 # define ALG_AES_IV_LEN 16
65 # define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len))
66 # define ALG_OP_TYPE unsigned int
67 # define ALG_OP_LEN (sizeof(ALG_OP_TYPE))
69 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
70 void engine_load_afalg_int(void);
73 /* Local Linkage Functions */
74 static int afalg_init_aio(afalg_aio *aio);
75 static int afalg_fin_cipher_aio(afalg_aio *ptr, int sfd,
76 unsigned char *buf, size_t len);
77 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
78 const char *ciphername);
79 static int afalg_destroy(ENGINE *e);
80 static int afalg_init(ENGINE *e);
81 static int afalg_finish(ENGINE *e);
82 static const EVP_CIPHER *afalg_aes_cbc(int nid);
83 static cbc_handles *get_cipher_handle(int nid);
84 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
85 const int **nids, int nid);
86 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
87 const unsigned char *iv, int enc);
88 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
89 const unsigned char *in, size_t inl);
90 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx);
91 static int afalg_chk_platform(void);
93 /* Engine Id and Name */
94 static const char *engine_afalg_id = "afalg";
95 static const char *engine_afalg_name = "AFALG engine support";
97 static int afalg_cipher_nids[] = {
103 static cbc_handles cbc_handle[] = {{AES_KEY_SIZE_128, NULL},
104 {AES_KEY_SIZE_192, NULL},
105 {AES_KEY_SIZE_256, NULL}};
107 static ossl_inline int io_setup(unsigned n, aio_context_t *ctx)
109 return syscall(__NR_io_setup, n, ctx);
112 static ossl_inline int eventfd(int n)
114 return syscall(__NR_eventfd2, n, 0);
117 static ossl_inline int io_destroy(aio_context_t ctx)
119 return syscall(__NR_io_destroy, ctx);
122 static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb)
124 return syscall(__NR_io_submit, ctx, n, iocb);
127 /* A version of 'struct timespec' with 32-bit time_t and nanoseconds. */
130 __kernel_long_t tv_sec;
131 __kernel_long_t tv_nsec;
134 static ossl_inline int io_getevents(aio_context_t ctx, long min, long max,
135 struct io_event *events,
136 struct timespec *timeout)
138 #if defined(__NR_io_pgetevents_time64)
139 /* Check if we are a 32-bit architecture with a 64-bit time_t */
140 if (sizeof(*timeout) != sizeof(struct __timespec32)) {
141 int ret = syscall(__NR_io_pgetevents_time64, ctx, min, max, events,
143 if (ret == 0 || errno != ENOSYS)
148 #if defined(__NR_io_getevents)
149 if (sizeof(*timeout) == sizeof(struct __timespec32))
151 * time_t matches our architecture length, we can just use
154 return syscall(__NR_io_getevents, ctx, min, max, events, timeout);
157 * We don't have __NR_io_pgetevents_time64, but we are using a
158 * 64-bit time_t on a 32-bit architecture. If we can fit the
159 * timeout value in a 32-bit time_t, then let's do that
160 * and then use the __NR_io_getevents syscall.
162 if (timeout && timeout->tv_sec == (long)timeout->tv_sec) {
163 struct __timespec32 ts32;
165 ts32.tv_sec = (__kernel_long_t) timeout->tv_sec;
166 ts32.tv_nsec = (__kernel_long_t) timeout->tv_nsec;
168 return syscall(__NR_io_getevents, ctx, min, max, events, ts32);
170 return syscall(__NR_io_getevents, ctx, min, max, events, NULL);
179 static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
180 OSSL_ASYNC_FD waitfd, void *custom)
185 static int afalg_setup_async_event_notification(afalg_aio *aio)
188 ASYNC_WAIT_CTX *waitctx;
192 if ((job = ASYNC_get_current_job()) != NULL) {
194 waitctx = ASYNC_get_wait_ctx(job);
195 if (waitctx == NULL) {
196 ALG_WARN("%s(%d): ASYNC_get_wait_ctx error", __FILE__, __LINE__);
199 /* Get waitfd from ASYNC_WAIT_CTX if it is already set */
200 ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id,
204 * waitfd is not set in ASYNC_WAIT_CTX, create a new one
205 * and set it. efd will be signaled when AIO operation completes
207 aio->efd = eventfd(0);
208 if (aio->efd == -1) {
209 ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__,
211 AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
212 AFALG_R_EVENTFD_FAILED);
215 ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
217 afalg_waitfd_cleanup);
219 ALG_WARN("%s(%d): Failed to set wait fd", __FILE__, __LINE__);
223 /* make fd non-blocking in async mode */
224 if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
225 ALG_WARN("%s(%d): Failed to set event fd as NONBLOCKING",
229 aio->mode = MODE_ASYNC;
232 aio->efd = eventfd(0);
233 if (aio->efd == -1) {
234 ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__, __LINE__);
235 AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
236 AFALG_R_EVENTFD_FAILED);
239 aio->mode = MODE_SYNC;
244 static int afalg_init_aio(afalg_aio *aio)
248 /* Initialise for AIO */
250 r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx);
252 ALG_PERR("%s(%d): io_setup error : ", __FILE__, __LINE__);
253 AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED);
257 memset(aio->cbt, 0, sizeof(aio->cbt));
259 aio->mode = MODE_UNINIT;
264 static int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
269 unsigned int done = 0;
271 struct timespec timeout;
272 struct io_event events[MAX_INFLIGHTS];
278 /* if efd has not been initialised yet do it here */
279 if (aio->mode == MODE_UNINIT) {
280 r = afalg_setup_async_event_notification(aio);
285 cb = &(aio->cbt[0 % MAX_INFLIGHTS]);
286 memset(cb, '\0', sizeof(*cb));
287 cb->aio_fildes = sfd;
288 cb->aio_lio_opcode = IOCB_CMD_PREAD;
290 * The pointer has to be converted to unsigned value first to avoid
291 * sign extension on cast to 64 bit value in 32-bit builds
293 cb->aio_buf = (size_t)buf;
296 cb->aio_nbytes = len;
297 cb->aio_flags = IOCB_FLAG_RESFD;
298 cb->aio_resfd = aio->efd;
301 * Perform AIO read on AFALG socket, this in turn performs an async
302 * crypto operation in kernel space
304 r = io_read(aio->aio_ctx, 1, &cb);
306 ALG_PWARN("%s(%d): io_read failed : ", __FILE__, __LINE__);
311 /* While AIO read is being performed pause job */
314 /* Check for completion of AIO read */
315 r = read(aio->efd, &eval, sizeof(eval));
317 if (errno == EAGAIN || errno == EWOULDBLOCK)
319 ALG_PERR("%s(%d): read failed for event fd : ", __FILE__, __LINE__);
321 } else if (r == 0 || eval <= 0) {
322 ALG_WARN("%s(%d): eventfd read %d bytes, eval = %lu\n", __FILE__,
327 #ifdef OSSL_SANITIZE_MEMORY
329 * In a memory sanitiser build, the changes to memory made by the
330 * system call aren't reliably detected. By initialising the
331 * memory here, the sanitiser is told that they are okay.
333 memset(events, 0, sizeof(events));
336 /* Get results of AIO read */
337 r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS,
341 * events.res indicates the actual status of the operation.
342 * Handle the error condition first.
344 if (events[0].res < 0) {
346 * Underlying operation cannot be completed at the time
347 * of previous submission. Resubmit for the operation.
349 if (events[0].res == -EBUSY && retry++ < 3) {
350 r = io_read(aio->aio_ctx, 1, &cb);
352 ALG_PERR("%s(%d): retry %d for io_read failed : ",
353 __FILE__, __LINE__, retry);
359 * Retries exceed for -EBUSY or unrecoverable error
360 * condition for this instance of operation.
363 ("%s(%d): Crypto Operation failed with code %lld\n",
364 __FILE__, __LINE__, events[0].res);
368 /* Operation successful. */
371 ALG_PERR("%s(%d): io_getevents failed : ", __FILE__, __LINE__);
374 ALG_WARN("%s(%d): io_geteventd read 0 bytes\n", __FILE__,
383 static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg,
384 const ALG_OP_TYPE op)
386 cmsg->cmsg_level = SOL_ALG;
387 cmsg->cmsg_type = ALG_SET_OP;
388 cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN);
389 memcpy(CMSG_DATA(cmsg), &op, ALG_OP_LEN);
392 static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv,
393 const unsigned int len)
395 struct af_alg_iv *aiv;
397 cmsg->cmsg_level = SOL_ALG;
398 cmsg->cmsg_type = ALG_SET_IV;
399 cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len));
400 aiv = (struct af_alg_iv *)CMSG_DATA(cmsg);
402 memcpy(aiv->iv, iv, len);
405 static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key,
409 ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen);
411 ALG_PERR("%s(%d): Failed to set socket option : ", __FILE__, __LINE__);
412 AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED);
418 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
419 const char *ciphername)
421 struct sockaddr_alg sa;
424 actx->bfd = actx->sfd = -1;
426 memset(&sa, 0, sizeof(sa));
427 sa.salg_family = AF_ALG;
428 OPENSSL_strlcpy((char *) sa.salg_type, ciphertype, sizeof(sa.salg_type));
429 OPENSSL_strlcpy((char *) sa.salg_name, ciphername, sizeof(sa.salg_name));
431 actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
432 if (actx->bfd == -1) {
433 ALG_PERR("%s(%d): Failed to open socket : ", __FILE__, __LINE__);
434 AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED);
438 r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa));
440 ALG_PERR("%s(%d): Failed to bind socket : ", __FILE__, __LINE__);
441 AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED);
445 actx->sfd = accept(actx->bfd, NULL, 0);
447 ALG_PERR("%s(%d): Socket Accept Failed : ", __FILE__, __LINE__);
448 AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED);
459 actx->bfd = actx->sfd = -1;
463 static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in,
464 size_t inl, const unsigned char *iv,
468 struct cmsghdr *cmsg;
471 # ifdef ALG_ZERO_COPY
474 char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)];
476 memset(&msg, 0, sizeof(msg));
477 memset(cbuf, 0, sizeof(cbuf));
478 msg.msg_control = cbuf;
479 msg.msg_controllen = sizeof(cbuf);
482 * cipher direction (i.e. encrypt or decrypt) and iv are sent to the
483 * kernel as part of sendmsg()'s ancillary data
485 cmsg = CMSG_FIRSTHDR(&msg);
486 afalg_set_op_sk(cmsg, enc);
487 cmsg = CMSG_NXTHDR(&msg, cmsg);
488 afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN);
490 /* iov that describes input data */
491 iov.iov_base = (unsigned char *)in;
494 msg.msg_flags = MSG_MORE;
496 # ifdef ALG_ZERO_COPY
499 * Works best when buffer is 4k aligned
500 * OPENS: out of place processing (i.e. out != in)
503 /* Input data is not sent as part of call to sendmsg() */
507 /* Sendmsg() sends iv and cipher direction to the kernel */
508 sbytes = sendmsg(actx->sfd, &msg, 0);
510 ALG_PERR("%s(%d): sendmsg failed for zero copy cipher operation : ",
516 * vmsplice and splice are used to pin the user space input buffer for
517 * kernel space processing avoiding copies from user to kernel space
519 ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
521 ALG_PERR("%s(%d): vmsplice failed : ", __FILE__, __LINE__);
525 ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
527 ALG_PERR("%s(%d): splice failed : ", __FILE__, __LINE__);
534 /* Sendmsg() sends iv, cipher direction and input data to the kernel */
535 sbytes = sendmsg(actx->sfd, &msg, 0);
537 ALG_PERR("%s(%d): sendmsg failed for cipher operation : ", __FILE__,
542 if (sbytes != (ssize_t) inl) {
543 ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes,
552 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
553 const unsigned char *iv, int enc)
558 const char *ciphername;
560 if (ctx == NULL || key == NULL) {
561 ALG_WARN("%s(%d): Null Parameter\n", __FILE__, __LINE__);
565 if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
566 ALG_WARN("%s(%d): Cipher object NULL\n", __FILE__, __LINE__);
570 actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
572 ALG_WARN("%s(%d): Cipher data NULL\n", __FILE__, __LINE__);
576 ciphertype = EVP_CIPHER_CTX_get_nid(ctx);
577 switch (ciphertype) {
578 case NID_aes_128_cbc:
579 case NID_aes_192_cbc:
580 case NID_aes_256_cbc:
581 ciphername = "cbc(aes)";
584 ALG_WARN("%s(%d): Unsupported Cipher type %d\n", __FILE__, __LINE__,
589 if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_get_iv_length(ctx)) {
590 ALG_WARN("%s(%d): Unsupported IV length :%d\n", __FILE__, __LINE__,
591 EVP_CIPHER_CTX_get_iv_length(ctx));
595 /* Setup AFALG socket for crypto processing */
596 ret = afalg_create_sk(actx, "skcipher", ciphername);
600 if ((len = EVP_CIPHER_CTX_get_key_length(ctx)) <= 0)
602 ret = afalg_set_key(actx, key, len);
606 /* Setup AIO ctx to allow async AFALG crypto processing */
607 if (afalg_init_aio(&actx->aio) == 0)
610 # ifdef ALG_ZERO_COPY
614 actx->init_done = MAGIC_INIT_NUM;
624 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
625 const unsigned char *in, size_t inl)
629 char nxtiv[ALG_AES_IV_LEN] = { 0 };
631 if (ctx == NULL || out == NULL || in == NULL) {
632 ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
637 actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
638 if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
639 ALG_WARN("%s afalg ctx passed\n",
640 ctx == NULL ? "NULL" : "Uninitialised");
645 * set iv now for decrypt operation as the input buffer can be
646 * overwritten for inplace operation where in = out.
648 if (EVP_CIPHER_CTX_is_encrypting(ctx) == 0) {
649 memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN);
652 /* Send input data to kernel space */
653 ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl,
654 EVP_CIPHER_CTX_iv(ctx),
655 EVP_CIPHER_CTX_is_encrypting(ctx));
660 /* Perform async crypto operation in kernel space */
661 ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl);
665 if (EVP_CIPHER_CTX_is_encrypting(ctx)) {
666 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN),
669 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN);
675 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx)
680 ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
685 actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
686 if (actx == NULL || actx->init_done != MAGIC_INIT_NUM)
691 # ifdef ALG_ZERO_COPY
692 close(actx->zc_pipe[0]);
693 close(actx->zc_pipe[1]);
695 /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */
696 if (actx->aio.mode == MODE_SYNC)
697 close(actx->aio.efd);
698 io_destroy(actx->aio.aio_ctx);
703 static cbc_handles *get_cipher_handle(int nid)
706 case NID_aes_128_cbc:
707 return &cbc_handle[AES_CBC_128];
708 case NID_aes_192_cbc:
709 return &cbc_handle[AES_CBC_192];
710 case NID_aes_256_cbc:
711 return &cbc_handle[AES_CBC_256];
717 static const EVP_CIPHER *afalg_aes_cbc(int nid)
719 cbc_handles *cipher_handle = get_cipher_handle(nid);
721 if (cipher_handle == NULL)
723 if (cipher_handle->_hidden == NULL
724 && ((cipher_handle->_hidden =
725 EVP_CIPHER_meth_new(nid,
727 cipher_handle->key_size)) == NULL
728 || !EVP_CIPHER_meth_set_iv_length(cipher_handle->_hidden,
730 || !EVP_CIPHER_meth_set_flags(cipher_handle->_hidden,
732 EVP_CIPH_FLAG_DEFAULT_ASN1)
733 || !EVP_CIPHER_meth_set_init(cipher_handle->_hidden,
735 || !EVP_CIPHER_meth_set_do_cipher(cipher_handle->_hidden,
737 || !EVP_CIPHER_meth_set_cleanup(cipher_handle->_hidden,
738 afalg_cipher_cleanup)
739 || !EVP_CIPHER_meth_set_impl_ctx_size(cipher_handle->_hidden,
740 sizeof(afalg_ctx)))) {
741 EVP_CIPHER_meth_free(cipher_handle->_hidden);
742 cipher_handle->_hidden= NULL;
744 return cipher_handle->_hidden;
747 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
748 const int **nids, int nid)
752 if (cipher == NULL) {
753 *nids = afalg_cipher_nids;
754 return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0]));
758 case NID_aes_128_cbc:
759 case NID_aes_192_cbc:
760 case NID_aes_256_cbc:
761 *cipher = afalg_aes_cbc(nid);
770 static int bind_afalg(ENGINE *e)
772 /* Ensure the afalg error handling is set up */
774 ERR_load_AFALG_strings();
776 if (!ENGINE_set_id(e, engine_afalg_id)
777 || !ENGINE_set_name(e, engine_afalg_name)
778 || !ENGINE_set_destroy_function(e, afalg_destroy)
779 || !ENGINE_set_init_function(e, afalg_init)
780 || !ENGINE_set_finish_function(e, afalg_finish)) {
781 AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
786 * Create _hidden_aes_xxx_cbc by calling afalg_aes_xxx_cbc
787 * now, as bind_aflag can only be called by one thread at a
790 for (i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
791 if (afalg_aes_cbc(afalg_cipher_nids[i]) == NULL) {
792 AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
797 if (!ENGINE_set_ciphers(e, afalg_ciphers)) {
798 AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
805 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
806 static int bind_helper(ENGINE *e, const char *id)
808 if (id && (strcmp(id, engine_afalg_id) != 0))
811 if (!afalg_chk_platform())
819 IMPLEMENT_DYNAMIC_CHECK_FN()
820 IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
823 static int afalg_chk_platform(void)
827 int kver[3] = { -1, -1, -1 };
834 AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
835 AFALG_R_FAILED_TO_GET_PLATFORM_INFO);
839 str = strtok(ut.release, ".");
840 for (i = 0; i < 3 && str != NULL; i++) {
842 str = strtok(NULL, ".");
845 if (KERNEL_VERSION(kver[0], kver[1], kver[2])
846 < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) {
847 ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n",
848 kver[0], kver[1], kver[2]);
849 ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n",
850 K_MAJ, K_MIN1, K_MIN2);
851 AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
852 AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG);
856 /* Test if we can actually create an AF_ALG socket */
857 sock = socket(AF_ALG, SOCK_SEQPACKET, 0);
859 AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, AFALG_R_SOCKET_CREATE_FAILED);
867 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
868 static ENGINE *engine_afalg(void)
870 ENGINE *ret = ENGINE_new();
873 if (!bind_afalg(ret)) {
880 void engine_load_afalg_int(void)
884 if (!afalg_chk_platform())
887 toadd = engine_afalg();
893 * If the "add" worked, it gets a structural reference. So either way, we
894 * release our just-created reference.
898 * If the "add" didn't work, it was probably a conflict because it was
899 * already added (eg. someone calling ENGINE_load_blah then calling
900 * ENGINE_load_builtin_engines() perhaps).
906 static int afalg_init(ENGINE *e)
911 static int afalg_finish(ENGINE *e)
916 static int free_cbc(void)
918 short unsigned int i;
919 for (i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
920 EVP_CIPHER_meth_free(cbc_handle[i]._hidden);
921 cbc_handle[i]._hidden = NULL;
926 static int afalg_destroy(ENGINE *e)
928 ERR_unload_AFALG_strings();
933 #endif /* KERNEL VERSION */