Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 864 insertions, 0 deletions

diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/engines/e_afalg.c b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/engines/e_afalg.c
new file mode 100644
index 000000000..4b1722846
--- /dev/null
+++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/engines/e_afalg.c
@@ -0,0 +1,864 @@
+/*
+ * Copyright 2016-2020 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 "internal/nelem.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)
+# ifndef PEDANTIC
+#  warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
+#  warning "Skipping Compilation of AFALG engine"
+# endif
+void engine_load_afalg_int(void);
+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"
+# include "e_afalg_err.c"
+
+# 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))
+
+# 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);
+static const EVP_CIPHER *afalg_aes_cbc(int nid);
+static cbc_handles *get_cipher_handle(int nid);
+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,
+    NID_aes_192_cbc,
+    NID_aes_256_cbc,
+};
+
+static cbc_handles cbc_handle[] = {{AES_KEY_SIZE_128, NULL},
+                                    {AES_KEY_SIZE_192, NULL},
+                                    {AES_KEY_SIZE_256, 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_eventfd2, n, 0);
+}
+
+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(%d): ASYNC_get_wait_ctx error", __FILE__, __LINE__);
+            return 0;
+        }
+        /* Get waitfd from ASYNC_WAIT_CTX if it is already 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(%d): Failed to get eventfd : ", __FILE__,
+                         __LINE__);
+                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(%d): Failed to set wait fd", __FILE__, __LINE__);
+                close(aio->efd);
+                return 0;
+            }
+            /* make fd non-blocking in async mode */
+            if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
+                ALG_WARN("%s(%d): Failed to set event fd as NONBLOCKING",
+                         __FILE__, __LINE__);
+            }
+        }
+        aio->mode = MODE_ASYNC;
+    } else {
+        /* Sync mode */
+        aio->efd = eventfd(0);
+        if (aio->efd == -1) {
+            ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__, __LINE__);
+            AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
+                     AFALG_R_EVENTFD_FAILED);
+            return 0;
+        }
+        aio->mode = MODE_SYNC;
+    }
+    return 1;
+}
+
+static 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(%d): io_setup error : ", __FILE__, __LINE__);
+        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;
+}
+
+static 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;
+    /*
+     * The pointer has to be converted to unsigned value first to avoid
+     * sign extension on cast to 64 bit value in 32-bit builds
+     */
+    cb->aio_buf = (size_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(%d): io_read failed : ", __FILE__, __LINE__);
+        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(%d): read failed for event fd : ", __FILE__, __LINE__);
+            return 0;
+        } else if (r == 0 || eval <= 0) {
+            ALG_WARN("%s(%d): eventfd read %d bytes, eval = %lu\n", __FILE__,
+                     __LINE__, 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(%d): retry %d for io_read failed : ",
+                                     __FILE__, __LINE__, retry);
+                            return 0;
+                        }
+                        continue;
+                    } else {
+                        /*
+                         * Retries exceed for -EBUSY or unrecoverable error
+                         * condition for this instance of operation.
+                         */
+                        ALG_WARN
+                            ("%s(%d): Crypto Operation failed with code %lld\n",
+                             __FILE__, __LINE__, events[0].res);
+                        return 0;
+                    }
+                }
+                /* Operation successful. */
+                done = 1;
+            } else if (r < 0) {
+                ALG_PERR("%s(%d): io_getevents failed : ", __FILE__, __LINE__);
+                return 0;
+            } else {
+                ALG_WARN("%s(%d): io_geteventd read 0 bytes\n", __FILE__,
+                         __LINE__);
+            }
+        }
+    } 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(%d): Failed to set socket option : ", __FILE__, __LINE__);
+        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;
+    int r = -1;
+
+    actx->bfd = actx->sfd = -1;
+
+    memset(&sa, 0, sizeof(sa));
+    sa.salg_family = AF_ALG;
+    OPENSSL_strlcpy((char *) sa.salg_type, ciphertype, sizeof(sa.salg_type));
+    OPENSSL_strlcpy((char *) sa.salg_name, ciphername, sizeof(sa.salg_name));
+
+    actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
+    if (actx->bfd == -1) {
+        ALG_PERR("%s(%d): Failed to open socket : ", __FILE__, __LINE__);
+        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(%d): Failed to bind socket : ", __FILE__, __LINE__);
+        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(%d): Socket Accept Failed : ", __FILE__, __LINE__);
+        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(%d): sendmsg failed for zero copy cipher operation : ",
+                 __FILE__, __LINE__);
+        return 0;
+    }
+
+    /*
+     * vmsplice and splice are used to pin the user space input buffer for
+     * kernel space processing avoiding copies from user to kernel space
+     */
+    ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
+    if (ret < 0) {
+        ALG_PERR("%s(%d): vmsplice failed : ", __FILE__, __LINE__);
+        return 0;
+    }
+
+    ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
+    if (ret < 0) {
+        ALG_PERR("%s(%d): splice failed : ", __FILE__, __LINE__);
+        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(%d): sendmsg failed for cipher operation : ", __FILE__,
+                 __LINE__);
+        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;
+    const char *ciphername;
+
+    if (ctx == NULL || key == NULL) {
+        ALG_WARN("%s(%d): Null Parameter\n", __FILE__, __LINE__);
+        return 0;
+    }
+
+    if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
+        ALG_WARN("%s(%d): Cipher object NULL\n", __FILE__, __LINE__);
+        return 0;
+    }
+
+    actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
+    if (actx == NULL) {
+        ALG_WARN("%s(%d): Cipher data NULL\n", __FILE__, __LINE__);
+        return 0;
+    }
+
+    ciphertype = EVP_CIPHER_CTX_nid(ctx);
+    switch (ciphertype) {
+    case NID_aes_128_cbc:
+    case NID_aes_192_cbc:
+    case NID_aes_256_cbc:
+        ciphername = "cbc(aes)";
+        break;
+    default:
+        ALG_WARN("%s(%d): Unsupported Cipher type %d\n", __FILE__, __LINE__,
+                 ciphertype);
+        return 0;
+    }
+
+    if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) {
+        ALG_WARN("%s(%d): Unsupported IV length :%d\n", __FILE__, __LINE__,
+                 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(%d)\n", __FILE__,
+                 __LINE__);
+        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(%d)\n", __FILE__,
+                 __LINE__);
+        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;
+}
+
+static cbc_handles *get_cipher_handle(int nid)
+{
+    switch (nid) {
+    case NID_aes_128_cbc:
+        return &cbc_handle[AES_CBC_128];
+    case NID_aes_192_cbc:
+        return &cbc_handle[AES_CBC_192];
+    case NID_aes_256_cbc:
+        return &cbc_handle[AES_CBC_256];
+    default:
+        return NULL;
+    }
+}
+
+static const EVP_CIPHER *afalg_aes_cbc(int nid)
+{
+    cbc_handles *cipher_handle = get_cipher_handle(nid);
+    if (cipher_handle->_hidden == NULL
+        && ((cipher_handle->_hidden =
+         EVP_CIPHER_meth_new(nid,
+                             AES_BLOCK_SIZE,
+                             cipher_handle->key_size)) == NULL
+        || !EVP_CIPHER_meth_set_iv_length(cipher_handle->_hidden,
+                                          AES_IV_LEN)
+        || !EVP_CIPHER_meth_set_flags(cipher_handle->_hidden,
+                                      EVP_CIPH_CBC_MODE |
+                                      EVP_CIPH_FLAG_DEFAULT_ASN1)
+        || !EVP_CIPHER_meth_set_init(cipher_handle->_hidden,
+                                     afalg_cipher_init)
+        || !EVP_CIPHER_meth_set_do_cipher(cipher_handle->_hidden,
+                                          afalg_do_cipher)
+        || !EVP_CIPHER_meth_set_cleanup(cipher_handle->_hidden,
+                                        afalg_cipher_cleanup)
+        || !EVP_CIPHER_meth_set_impl_ctx_size(cipher_handle->_hidden,
+                                              sizeof(afalg_ctx)))) {
+        EVP_CIPHER_meth_free(cipher_handle->_hidden);
+        cipher_handle->_hidden= NULL;
+    }
+    return cipher_handle->_hidden;
+}
+
+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:
+    case NID_aes_192_cbc:
+    case NID_aes_256_cbc:
+        *cipher = afalg_aes_cbc(nid);
+        break;
+    default:
+        *cipher = NULL;
+        r = 0;
+    }
+    return r;
+}
+
+static int bind_afalg(ENGINE *e)
+{
+    /* Ensure the afalg error handling is set up */
+    unsigned short i;
+    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_xxx_cbc by calling afalg_aes_xxx_cbc
+     * now, as bind_aflag can only be called by one thread at a
+     * time.
+     */
+    for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
+        if (afalg_aes_cbc(afalg_cipher_nids[i]) == 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 free_cbc(void)
+{
+    short unsigned int i;
+    for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
+        EVP_CIPHER_meth_free(cbc_handle[i]._hidden);
+        cbc_handle[i]._hidden = NULL;
+    }
+    return 1;
+}
+
+static int afalg_destroy(ENGINE *e)
+{
+    ERR_unload_AFALG_strings();
+    free_cbc();
+    return 1;
+}
+
+#endif                          /* KERNEL VERSION */