--- /dev/null
+/*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* Required for vmsplice */
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <openssl/engine.h>
+#include <openssl/async.h>
+#include <openssl/err.h>
+
+#include <sys/socket.h>
+#include <linux/version.h>
+#define K_MAJ 4
+#define K_MIN1 1
+#define K_MIN2 0
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \
+ !defined(AF_ALG)
+# warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
+# warning "Skipping Compilation of AFALG engine"
+void engine_load_afalg_int(void)
+{
+}
+#else
+
+# include <linux/if_alg.h>
+# include <fcntl.h>
+# include <sys/utsname.h>
+
+# include <linux/aio_abi.h>
+# include <sys/syscall.h>
+# include <errno.h>
+
+# include "e_afalg.h"
+
+# define AFALG_LIB_NAME "AFALG"
+# include "e_afalg_err.h"
+
+# ifndef SOL_ALG
+# define SOL_ALG 279
+# endif
+
+# ifdef ALG_ZERO_COPY
+# ifndef SPLICE_F_GIFT
+# define SPLICE_F_GIFT (0x08)
+# endif
+# endif
+
+# define ALG_AES_IV_LEN 16
+# define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len))
+# define ALG_OP_TYPE unsigned int
+# define ALG_OP_LEN (sizeof(ALG_OP_TYPE))
+
+#define ALG_MAX_SALG_NAME 64
+#define ALG_MAX_SALG_TYPE 14
+
+# ifdef OPENSSL_NO_DYNAMIC_ENGINE
+void engine_load_afalg_int(void);
+# endif
+
+/* Local Linkage Functions */
+static int afalg_init_aio(afalg_aio *aio);
+static int afalg_fin_cipher_aio(afalg_aio *ptr, int sfd,
+ unsigned char *buf, size_t len);
+static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
+ const char *ciphername);
+static int afalg_destroy(ENGINE *e);
+static int afalg_init(ENGINE *e);
+static int afalg_finish(ENGINE *e);
+const EVP_CIPHER *afalg_aes_128_cbc(void);
+static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+ const int **nids, int nid);
+static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc);
+static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t inl);
+static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx);
+static int afalg_chk_platform(void);
+
+/* Engine Id and Name */
+static const char *engine_afalg_id = "afalg";
+static const char *engine_afalg_name = "AFALG engine support";
+
+static int afalg_cipher_nids[] = {
+ NID_aes_128_cbc
+};
+
+static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
+
+static ossl_inline int io_setup(unsigned n, aio_context_t *ctx)
+{
+ return syscall(__NR_io_setup, n, ctx);
+}
+
+static ossl_inline int eventfd(int n)
+{
+ return syscall(__NR_eventfd, n);
+}
+
+static ossl_inline int io_destroy(aio_context_t ctx)
+{
+ return syscall(__NR_io_destroy, ctx);
+}
+
+static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb)
+{
+ return syscall(__NR_io_submit, ctx, n, iocb);
+}
+
+static ossl_inline int io_getevents(aio_context_t ctx, long min, long max,
+ struct io_event *events,
+ struct timespec *timeout)
+{
+ return syscall(__NR_io_getevents, ctx, min, max, events, timeout);
+}
+
+static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
+ OSSL_ASYNC_FD waitfd, void *custom)
+{
+ close(waitfd);
+}
+
+static int afalg_setup_async_event_notification(afalg_aio *aio)
+{
+ ASYNC_JOB *job;
+ ASYNC_WAIT_CTX *waitctx;
+ void *custom = NULL;
+ int ret;
+
+ if ((job = ASYNC_get_current_job()) != NULL) {
+ /* Async mode */
+ waitctx = ASYNC_get_wait_ctx(job);
+ if (waitctx == NULL) {
+ ALG_WARN("%s: ASYNC_get_wait_ctx error", __func__);
+ return 0;
+ }
+ /* Get waitfd from ASYNC_WAIT_CTX if it is alreday set */
+ ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id,
+ &aio->efd, &custom);
+ if (ret == 0) {
+ /*
+ * waitfd is not set in ASYNC_WAIT_CTX, create a new one
+ * and set it. efd will be signaled when AIO operation completes
+ */
+ aio->efd = eventfd(0);
+ if (aio->efd == -1) {
+ ALG_PERR("%s: Failed to get eventfd : ", __func__);
+ AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
+ AFALG_R_EVENTFD_FAILED);
+ return 0;
+ }
+ ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
+ aio->efd, custom,
+ afalg_waitfd_cleanup);
+ if (ret == 0) {
+ ALG_WARN("%s: Failed to set wait fd", __func__);
+ close(aio->efd);
+ return 0;
+ }
+ /* make fd non-blocking in async mode */
+ if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
+ ALG_WARN("%s: Failed to set event fd as NONBLOCKING",
+ __func__);
+ }
+ }
+ aio->mode = MODE_ASYNC;
+ } else {
+ /* Sync mode */
+ aio->efd = eventfd(0);
+ if (aio->efd == -1) {
+ ALG_PERR("%s: Failed to get eventfd : ", __func__);
+ AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
+ AFALG_R_EVENTFD_FAILED);
+ return 0;
+ }
+ aio->mode = MODE_SYNC;
+ }
+ return 1;
+}
+
+int afalg_init_aio(afalg_aio *aio)
+{
+ int r = -1;
+
+ /* Initialise for AIO */
+ aio->aio_ctx = 0;
+ r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx);
+ if (r < 0) {
+ ALG_PERR("%s: io_setup error : ", __func__);
+ AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED);
+ return 0;
+ }
+
+ memset(aio->cbt, 0, sizeof(aio->cbt));
+ aio->efd = -1;
+ aio->mode = MODE_UNINIT;
+
+ return 1;
+}
+
+int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
+ size_t len)
+{
+ int r;
+ int retry = 0;
+ unsigned int done = 0;
+ struct iocb *cb;
+ struct timespec timeout;
+ struct io_event events[MAX_INFLIGHTS];
+ u_int64_t eval = 0;
+
+ timeout.tv_sec = 0;
+ timeout.tv_nsec = 0;
+
+ /* if efd has not been initialised yet do it here */
+ if (aio->mode == MODE_UNINIT) {
+ r = afalg_setup_async_event_notification(aio);
+ if (r == 0)
+ return 0;
+ }
+
+ cb = &(aio->cbt[0 % MAX_INFLIGHTS]);
+ memset(cb, '\0', sizeof(*cb));
+ cb->aio_fildes = sfd;
+ cb->aio_lio_opcode = IOCB_CMD_PREAD;
+ if (sizeof(buf) != sizeof(cb->aio_buf)) {
+ /*
+ * The pointer has to be converted to 32 bit unsigned value first
+ * to avoid sign extension on cast to 64 bit value
+ */
+ cb->aio_buf = (uint64_t)(unsigned long)buf;
+ } else {
+ cb->aio_buf = (uint64_t)buf;
+ }
+ cb->aio_offset = 0;
+ cb->aio_data = 0;
+ cb->aio_nbytes = len;
+ cb->aio_flags = IOCB_FLAG_RESFD;
+ cb->aio_resfd = aio->efd;
+
+ /*
+ * Perform AIO read on AFALG socket, this in turn performs an async
+ * crypto operation in kernel space
+ */
+ r = io_read(aio->aio_ctx, 1, &cb);
+ if (r < 0) {
+ ALG_PWARN("%s: io_read failed : ", __func__);
+ return 0;
+ }
+
+ do {
+ /* While AIO read is being performed pause job */
+ ASYNC_pause_job();
+
+ /* Check for completion of AIO read */
+ r = read(aio->efd, &eval, sizeof(eval));
+ if (r < 0) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ continue;
+ ALG_PERR("%s: read failed for event fd : ", __func__);
+ return 0;
+ } else if (r == 0 || eval <= 0) {
+ ALG_WARN("%s: eventfd read %d bytes, eval = %lu\n", __func__, r,
+ eval);
+ }
+ if (eval > 0) {
+
+ /* Get results of AIO read */
+ r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS,
+ events, &timeout);
+ if (r > 0) {
+ /*
+ * events.res indicates the actual status of the operation.
+ * Handle the error condition first.
+ */
+ if (events[0].res < 0) {
+ /*
+ * Underlying operation cannot be completed at the time
+ * of previous submission. Resubmit for the operation.
+ */
+ if (events[0].res == -EBUSY && retry++ < 3) {
+ r = io_read(aio->aio_ctx, 1, &cb);
+ if (r < 0) {
+ ALG_PERR("%s: retry %d for io_read failed : ",
+ __func__, retry);
+ return 0;
+ }
+ continue;
+ } else {
+ /*
+ * Retries exceed for -EBUSY or unrecoverable error
+ * condition for this instance of operation.
+ */
+ ALG_WARN
+ ("%s: Crypto Operation failed with code %lld\n",
+ __func__, events[0].res);
+ return 0;
+ }
+ }
+ /* Operation successful. */
+ done = 1;
+ } else if (r < 0) {
+ ALG_PERR("%s: io_getevents failed : ", __func__);
+ return 0;
+ } else {
+ ALG_WARN("%s: io_geteventd read 0 bytes\n", __func__);
+ }
+ }
+ } while (!done);
+
+ return 1;
+}
+
+static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg,
+ const ALG_OP_TYPE op)
+{
+ cmsg->cmsg_level = SOL_ALG;
+ cmsg->cmsg_type = ALG_SET_OP;
+ cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN);
+ memcpy(CMSG_DATA(cmsg), &op, ALG_OP_LEN);
+}
+
+static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv,
+ const unsigned int len)
+{
+ struct af_alg_iv *aiv;
+
+ cmsg->cmsg_level = SOL_ALG;
+ cmsg->cmsg_type = ALG_SET_IV;
+ cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len));
+ aiv = (struct af_alg_iv *)CMSG_DATA(cmsg);
+ aiv->ivlen = len;
+ memcpy(aiv->iv, iv, len);
+}
+
+static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key,
+ const int klen)
+{
+ int ret;
+ ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen);
+ if (ret < 0) {
+ ALG_PERR("%s: Failed to set socket option : ", __func__);
+ AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
+ const char *ciphername)
+{
+ struct sockaddr_alg sa;
+
+ actx->bfd = actx->sfd = -1;
+ int r = -1;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.salg_family = AF_ALG;
+ strncpy((char *) sa.salg_type, ciphertype, ALG_MAX_SALG_TYPE);
+ sa.salg_type[ALG_MAX_SALG_TYPE-1] = '\0';
+ strncpy((char *) sa.salg_name, ciphername, ALG_MAX_SALG_NAME);
+ sa.salg_name[ALG_MAX_SALG_NAME-1] = '\0';
+
+ actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
+ if (actx->bfd == -1) {
+ ALG_PERR("%s: Failed to open socket : ", __func__);
+ AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED);
+ goto err;
+ }
+
+ r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa));
+ if (r < 0) {
+ ALG_PERR("%s: Failed to bind socket : ", __func__);
+ AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED);
+ goto err;
+ }
+
+ actx->sfd = accept(actx->bfd, NULL, 0);
+ if (actx->sfd < 0) {
+ ALG_PERR("%s: Socket Accept Failed : ", __func__);
+ AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED);
+ goto err;
+ }
+
+ return 1;
+
+ err:
+ if (actx->bfd >= 0)
+ close(actx->bfd);
+ if (actx->sfd >= 0)
+ close(actx->sfd);
+ actx->bfd = actx->sfd = -1;
+ return 0;
+}
+
+static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in,
+ size_t inl, const unsigned char *iv,
+ unsigned int enc)
+{
+ struct msghdr msg = { 0 };
+ struct cmsghdr *cmsg;
+ struct iovec iov;
+ ssize_t sbytes;
+# ifdef ALG_ZERO_COPY
+ int ret;
+# endif
+ char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)];
+
+ memset(cbuf, 0, sizeof(cbuf));
+ msg.msg_control = cbuf;
+ msg.msg_controllen = sizeof(cbuf);
+
+ /*
+ * cipher direction (i.e. encrypt or decrypt) and iv are sent to the
+ * kernel as part of sendmsg()'s ancillary data
+ */
+ cmsg = CMSG_FIRSTHDR(&msg);
+ afalg_set_op_sk(cmsg, enc);
+ cmsg = CMSG_NXTHDR(&msg, cmsg);
+ afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN);
+
+ /* iov that describes input data */
+ iov.iov_base = (unsigned char *)in;
+ iov.iov_len = inl;
+
+ msg.msg_flags = MSG_MORE;
+
+# ifdef ALG_ZERO_COPY
+ /*
+ * ZERO_COPY mode
+ * Works best when buffer is 4k aligned
+ * OPENS: out of place processing (i.e. out != in)
+ */
+
+ /* Input data is not sent as part of call to sendmsg() */
+ msg.msg_iovlen = 0;
+ msg.msg_iov = NULL;
+
+ /* Sendmsg() sends iv and cipher direction to the kernel */
+ sbytes = sendmsg(actx->sfd, &msg, 0);
+ if (sbytes < 0) {
+ ALG_PERR("%s: sendmsg failed for zero copy cipher operation : ",
+ __func__);
+ return 0;
+ }
+
+ /*
+ * vmsplice and splice are used to pin the user space input buffer for
+ * kernel space processing avoiding copys from user to kernel space
+ */
+ ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
+ if (ret < 0) {
+ ALG_PERR("%s: vmsplice failed : ", __func__);
+ return 0;
+ }
+
+ ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
+ if (ret < 0) {
+ ALG_PERR("%s: splice failed : ", __func__);
+ return 0;
+ }
+# else
+ msg.msg_iovlen = 1;
+ msg.msg_iov = &iov;
+
+ /* Sendmsg() sends iv, cipher direction and input data to the kernel */
+ sbytes = sendmsg(actx->sfd, &msg, 0);
+ if (sbytes < 0) {
+ ALG_PERR("%s: sendmsg failed for cipher operation : ", __func__);
+ return 0;
+ }
+
+ if (sbytes != (ssize_t) inl) {
+ ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes,
+ inl);
+ return 0;
+ }
+# endif
+
+ return 1;
+}
+
+static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ int ciphertype;
+ int ret;
+ afalg_ctx *actx;
+ char ciphername[ALG_MAX_SALG_NAME];
+
+ if (ctx == NULL || key == NULL) {
+ ALG_WARN("%s: Null Parameter\n", __func__);
+ return 0;
+ }
+
+ if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
+ ALG_WARN("%s: Cipher object NULL\n", __func__);
+ return 0;
+ }
+
+ actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
+ if (actx == NULL) {
+ ALG_WARN("%s: Cipher data NULL\n", __func__);
+ return 0;
+ }
+
+ ciphertype = EVP_CIPHER_CTX_nid(ctx);
+ switch (ciphertype) {
+ case NID_aes_128_cbc:
+ strncpy(ciphername, "cbc(aes)", ALG_MAX_SALG_NAME);
+ break;
+ default:
+ ALG_WARN("%s: Unsupported Cipher type %d\n", __func__, ciphertype);
+ return 0;
+ }
+ ciphername[ALG_MAX_SALG_NAME-1]='\0';
+
+ if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) {
+ ALG_WARN("%s: Unsupported IV length :%d\n", __func__,
+ EVP_CIPHER_CTX_iv_length(ctx));
+ return 0;
+ }
+
+ /* Setup AFALG socket for crypto processing */
+ ret = afalg_create_sk(actx, "skcipher", ciphername);
+ if (ret < 1)
+ return 0;
+
+
+ ret = afalg_set_key(actx, key, EVP_CIPHER_CTX_key_length(ctx));
+ if (ret < 1)
+ goto err;
+
+ /* Setup AIO ctx to allow async AFALG crypto processing */
+ if (afalg_init_aio(&actx->aio) == 0)
+ goto err;
+
+# ifdef ALG_ZERO_COPY
+ pipe(actx->zc_pipe);
+# endif
+
+ actx->init_done = MAGIC_INIT_NUM;
+
+ return 1;
+
+err:
+ close(actx->sfd);
+ close(actx->bfd);
+ return 0;
+}
+
+static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t inl)
+{
+ afalg_ctx *actx;
+ int ret;
+ char nxtiv[ALG_AES_IV_LEN] = { 0 };
+
+ if (ctx == NULL || out == NULL || in == NULL) {
+ ALG_WARN("NULL parameter passed to function %s\n", __func__);
+ return 0;
+ }
+
+ actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
+ if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
+ ALG_WARN("%s afalg ctx passed\n",
+ ctx == NULL ? "NULL" : "Uninitialised");
+ return 0;
+ }
+
+ /*
+ * set iv now for decrypt operation as the input buffer can be
+ * overwritten for inplace operation where in = out.
+ */
+ if (EVP_CIPHER_CTX_encrypting(ctx) == 0) {
+ memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN);
+ }
+
+ /* Send input data to kernel space */
+ ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl,
+ EVP_CIPHER_CTX_iv(ctx),
+ EVP_CIPHER_CTX_encrypting(ctx));
+ if (ret < 1) {
+ return 0;
+ }
+
+ /* Perform async crypto operation in kernel space */
+ ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl);
+ if (ret < 1)
+ return 0;
+
+ if (EVP_CIPHER_CTX_encrypting(ctx)) {
+ memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN),
+ ALG_AES_IV_LEN);
+ } else {
+ memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN);
+ }
+
+ return 1;
+}
+
+static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx)
+{
+ afalg_ctx *actx;
+
+ if (ctx == NULL) {
+ ALG_WARN("NULL parameter passed to function %s\n", __func__);
+ return 0;
+ }
+
+ actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
+ if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
+ ALG_WARN("%s afalg ctx passed\n",
+ ctx == NULL ? "NULL" : "Uninitialised");
+ return 0;
+ }
+
+ close(actx->sfd);
+ close(actx->bfd);
+# ifdef ALG_ZERO_COPY
+ close(actx->zc_pipe[0]);
+ close(actx->zc_pipe[1]);
+# endif
+ /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */
+ if (actx->aio.mode == MODE_SYNC)
+ close(actx->aio.efd);
+ io_destroy(actx->aio.aio_ctx);
+
+ return 1;
+}
+
+const EVP_CIPHER *afalg_aes_128_cbc(void)
+{
+ if (_hidden_aes_128_cbc == NULL
+ && ((_hidden_aes_128_cbc =
+ EVP_CIPHER_meth_new(NID_aes_128_cbc,
+ AES_BLOCK_SIZE,
+ AES_KEY_SIZE_128)) == NULL
+ || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc, AES_IV_LEN)
+ || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
+ EVP_CIPH_CBC_MODE |
+ EVP_CIPH_FLAG_DEFAULT_ASN1)
+ || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
+ afalg_cipher_init)
+ || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
+ afalg_do_cipher)
+ || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
+ afalg_cipher_cleanup)
+ || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
+ sizeof(afalg_ctx)))) {
+ EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
+ _hidden_aes_128_cbc = NULL;
+ }
+ return _hidden_aes_128_cbc;
+}
+
+static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+ const int **nids, int nid)
+{
+ int r = 1;
+
+ if (cipher == NULL) {
+ *nids = afalg_cipher_nids;
+ return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0]));
+ }
+
+ switch (nid) {
+ case NID_aes_128_cbc:
+ *cipher = afalg_aes_128_cbc();
+ break;
+ default:
+ *cipher = NULL;
+ r = 0;
+ }
+
+ return r;
+}
+
+static int bind_afalg(ENGINE *e)
+{
+ /* Ensure the afalg error handling is set up */
+ ERR_load_AFALG_strings();
+
+ if (!ENGINE_set_id(e, engine_afalg_id)
+ || !ENGINE_set_name(e, engine_afalg_name)
+ || !ENGINE_set_destroy_function(e, afalg_destroy)
+ || !ENGINE_set_init_function(e, afalg_init)
+ || !ENGINE_set_finish_function(e, afalg_finish)) {
+ AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
+ return 0;
+ }
+
+ /*
+ * Create _hidden_aes_128_cbc by calling afalg_aes_128_cbc
+ * now, as bind_aflag can only be called by one thread at a
+ * time.
+ */
+ if (afalg_aes_128_cbc() == NULL) {
+ AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
+ return 0;
+ }
+
+ if (!ENGINE_set_ciphers(e, afalg_ciphers)) {
+ AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
+ return 0;
+ }
+
+ return 1;
+}
+
+# ifndef OPENSSL_NO_DYNAMIC_ENGINE
+static int bind_helper(ENGINE *e, const char *id)
+{
+ if (id && (strcmp(id, engine_afalg_id) != 0))
+ return 0;
+
+ if (!afalg_chk_platform())
+ return 0;
+
+ if (!bind_afalg(e))
+ return 0;
+ return 1;
+}
+
+IMPLEMENT_DYNAMIC_CHECK_FN()
+ IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
+# endif
+
+static int afalg_chk_platform(void)
+{
+ int ret;
+ int i;
+ int kver[3] = { -1, -1, -1 };
+ int sock;
+ char *str;
+ struct utsname ut;
+
+ ret = uname(&ut);
+ if (ret != 0) {
+ AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
+ AFALG_R_FAILED_TO_GET_PLATFORM_INFO);
+ return 0;
+ }
+
+ str = strtok(ut.release, ".");
+ for (i = 0; i < 3 && str != NULL; i++) {
+ kver[i] = atoi(str);
+ str = strtok(NULL, ".");
+ }
+
+ if (KERNEL_VERSION(kver[0], kver[1], kver[2])
+ < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) {
+ ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n",
+ kver[0], kver[1], kver[2]);
+ ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n",
+ K_MAJ, K_MIN1, K_MIN2);
+ AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
+ AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG);
+ return 0;
+ }
+
+ /* Test if we can actually create an AF_ALG socket */
+ sock = socket(AF_ALG, SOCK_SEQPACKET, 0);
+ if (sock == -1) {
+ AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, AFALG_R_SOCKET_CREATE_FAILED);
+ return 0;
+ }
+ close(sock);
+
+ return 1;
+}
+
+# ifdef OPENSSL_NO_DYNAMIC_ENGINE
+static ENGINE *engine_afalg(void)
+{
+ ENGINE *ret = ENGINE_new();
+ if (ret == NULL)
+ return NULL;
+ if (!bind_afalg(ret)) {
+ ENGINE_free(ret);
+ return NULL;
+ }
+ return ret;
+}
+
+void engine_load_afalg_int(void)
+{
+ ENGINE *toadd;
+
+ if (!afalg_chk_platform())
+ return;
+
+ toadd = engine_afalg();
+ if (toadd == NULL)
+ return;
+ ENGINE_add(toadd);
+ ENGINE_free(toadd);
+ ERR_clear_error();
+}
+# endif
+
+static int afalg_init(ENGINE *e)
+{
+ return 1;
+}
+
+static int afalg_finish(ENGINE *e)
+{
+ return 1;
+}
+
+static int afalg_destroy(ENGINE *e)
+{
+ ERR_unload_AFALG_strings();
+ EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
+ _hidden_aes_128_cbc = NULL;
+ return 1;
+}
+
+#endif /* KERNEL VERSION */
projects / cassiopeia.git / blobdiff