crypto/engine/eng_devcrypto.c - third_party/openssl - Git at Google

 /*
  * Copyright 2017 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
  */

 #include "e_os.h"
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <assert.h>

 #include <openssl/evp.h>
 #include <openssl/err.h>
 #include <openssl/engine.h>
 #include <openssl/objects.h>
 #include <crypto/cryptodev.h>

 #include "internal/engine.h"

 #ifdef CRYPTO_ALGORITHM_MIN
 # define CHECK_BSD_STYLE_MACROS
 #endif

 /******************************************************************************
  *
  * Ciphers
  *
  * Because they all do the same basic operation, we have only one set of
  * method functions for them all to share, and a mapping table between
  * NIDs and cryptodev IDs, with all the necessary size data.
  *
  *****/

 struct cipher_ctx {
     int cfd;
     struct session_op sess;

     /* to pass from init to do_cipher */
     const unsigned char *iv;
     int op;                      /* COP_ENCRYPT or COP_DECRYPT */
 };

 static const struct cipher_data_st {
     int nid;
     int blocksize;
     int keylen;
     int ivlen;
     int flags;
     int devcryptoid;
 } cipher_data[] = {
 #ifndef OPENSSL_NO_DES
     { NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC },
     { NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC },
 #endif
 #ifndef OPENSSL_NO_BF
     { NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC },
 #endif
 #ifndef OPENSSL_NO_CAST
     { NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC },
 #endif
     { NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
     { NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
     { NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
 #ifndef OPENSSL_NO_RC4
     { NID_rc4, 1, 16, 0, CRYPTO_ARC4 },
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_CTR)
     { NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
     { NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
     { NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
 #endif
 #if 0                            /* Not yet supported */
     { NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
     { NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_ECB)
     { NID_aes_128_ecb, 16, 128 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
     { NID_aes_192_ecb, 16, 192 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
     { NID_aes_256_ecb, 16, 256 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
 #endif
 #if 0                            /* Not yet supported */
     { NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
     { NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
     { NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
 #endif
 #ifndef OPENSSL_NO_CAMELLIA
     { NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE,
       CRYPTO_CAMELLIA_CBC },
     { NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE,
       CRYPTO_CAMELLIA_CBC },
     { NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE,
       CRYPTO_CAMELLIA_CBC },
 #endif
 };

 static size_t get_cipher_data_index(int nid)
 {
     size_t i;

     for (i = 0; i < OSSL_NELEM(cipher_data); i++)
         if (nid == cipher_data[i].nid)
             return i;

     /*
      * Code further down must make sure that only NIDs in the table above
      * are used.  If any other NID reaches this function, there's a grave
      * coding error further down.
      */
     assert("Code that never should be reached" == NULL);
     return -1;
 }

 static const struct cipher_data_st *get_cipher_data(int nid)
 {
     return &cipher_data[get_cipher_data_index(nid)];
 }

 /*
  * Following are the three necessary functions to map OpenSSL functionality
  * with cryptodev.
  */

 static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
 {
     struct cipher_ctx *cipher_ctx =
         (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
     const struct cipher_data_st *cipher_d =
         get_cipher_data(EVP_CIPHER_CTX_nid(ctx));

     if ((cipher_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
         SYSerr(SYS_F_OPEN, errno);
         return 0;
     }

     memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
     cipher_ctx->sess.cipher = cipher_d->devcryptoid;
     cipher_ctx->sess.keylen = cipher_d->keylen;
     cipher_ctx->sess.key = (void *)key;
     cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT;
     if (ioctl(cipher_ctx->cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         close(cipher_ctx->cfd);
         return 0;
     }

     return 1;
 }

 static int cipher_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                             const unsigned char *in, size_t inl)
 {
     struct cipher_ctx *cipher_ctx =
         (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
     struct crypt_op cryp;
 #if !defined(COP_FLAG_WRITE_IV)
     unsigned char saved_iv[EVP_MAX_IV_LENGTH];
 #endif

     memset(&cryp, 0, sizeof(cryp));
     cryp.ses = cipher_ctx->sess.ses;
     cryp.len = inl;
     cryp.src = (void *)in;
     cryp.dst = (void *)out;
     cryp.iv = (void *)EVP_CIPHER_CTX_iv_noconst(ctx);
     cryp.op = cipher_ctx->op;
 #if !defined(COP_FLAG_WRITE_IV)
     cryp.flags = 0;

     if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
         assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
         if (!EVP_CIPHER_CTX_encrypting(ctx)) {
             unsigned char *ivptr = in + inl - EVP_CIPHER_CTX_iv_length(ctx);

             memcpy(saved_iv, ivptr, EVP_CIPHER_CTX_iv_length(ctx));
         }
     }
 #else
     cryp.flags = COP_FLAG_WRITE_IV;
 #endif

     if (ioctl(cipher_ctx->cfd, CIOCCRYPT, &cryp) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         return 0;
     }

 #if !defined(COP_FLAG_WRITE_IV)
     if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
         unsigned char *ivptr = saved_iv;

         assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
         if (!EVP_CIPHER_CTX_encrypting(ctx))
             ivptr = out + inl - EVP_CIPHER_CTX_iv_length(ctx);

         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), ivptr,
                EVP_CIPHER_CTX_iv_length(ctx));
     }
 #endif

     return 1;
 }

 static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
 {
     struct cipher_ctx *cipher_ctx =
         (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);

     if (ioctl(cipher_ctx->cfd, CIOCFSESSION, &cipher_ctx->sess) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         return 0;
     }
     if (close(cipher_ctx->cfd) < 0) {
         SYSerr(SYS_F_CLOSE, errno);
         return 0;
     }

     return 1;
 }

 /*
  * Keep a table of known nids and associated methods.
  * Note that known_cipher_nids[] isn't necessarily indexed the same way as
  * cipher_data[] above, which known_cipher_methods[] is.
  */
 static int known_cipher_nids[OSSL_NELEM(cipher_data)];
 static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
 static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };

 static void prepare_cipher_methods()
 {
     size_t i;
     struct session_op sess;
     int cfd;

     if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
         return;

     memset(&sess, 0, sizeof(sess));
     sess.key = (void *)"01234567890123456789012345678901234567890123456789";

     for (i = 0, known_cipher_nids_amount = 0;
          i < OSSL_NELEM(cipher_data); i++) {

         /*
          * Check that the algo is really availably by trying to open and close
          * a session.
          */
         sess.cipher = cipher_data[i].devcryptoid;
         sess.keylen = cipher_data[i].keylen;
         if (ioctl(cfd, CIOCGSESSION, &sess) < 0
             || ioctl(cfd, CIOCFSESSION, &sess) < 0)
             continue;

         if ((known_cipher_methods[i] =
                  EVP_CIPHER_meth_new(cipher_data[i].nid,
                                      cipher_data[i].blocksize,
                                      cipher_data[i].keylen)) == NULL
             || !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
                                               cipher_data[i].ivlen)
             || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
                                           cipher_data[i].flags
                                           | EVP_CIPH_FLAG_DEFAULT_ASN1)
             || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
             || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
                                               cipher_do_cipher)
             || !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i],
                                             cipher_cleanup)
             || !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i],
                                                   sizeof(struct cipher_ctx))) {
             EVP_CIPHER_meth_free(known_cipher_methods[i]);
             known_cipher_methods[i] = NULL;
         } else {
             known_cipher_nids[known_cipher_nids_amount++] =
                 cipher_data[i].nid;
         }
     }

     close(cfd);
 }

 static const EVP_CIPHER *get_cipher_method(int nid)
 {
     size_t i = get_cipher_data_index(nid);

     if (i == (size_t)-1)
         return NULL;
     return known_cipher_methods[i];
 }

 static int get_cipher_nids(const int **nids)
 {
     *nids = known_cipher_nids;
     return known_cipher_nids_amount;
 }

 static void destroy_cipher_method(int nid)
 {
     size_t i = get_cipher_data_index(nid);

     EVP_CIPHER_meth_free(known_cipher_methods[i]);
     known_cipher_methods[i] = NULL;
 }

 static void destroy_all_cipher_methods()
 {
     size_t i;

     for (i = 0; i < OSSL_NELEM(cipher_data); i++)
         destroy_cipher_method(cipher_data[i].nid);
 }

 static int devcrypto_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
                              const int **nids, int nid)
 {
     if (cipher == NULL)
         return get_cipher_nids(nids);

     *cipher = get_cipher_method(nid);

     return *cipher != NULL;
 }

 /*
  * We only support digests if the cryptodev implementation supports multiple
  * data updates.  Otherwise, we would be forced to maintain a cache, which is
  * perilous if there's a lot of data coming in (if someone wants to checksum
  * an OpenSSL tarball, for example).
  */
 #if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)

 /******************************************************************************
  *
  * Digests
  *
  * Because they all do the same basic operation, we have only one set of
  * method functions for them all to share, and a mapping table between
  * NIDs and cryptodev IDs, with all the necessary size data.
  *
  *****/

 struct digest_ctx {
     int cfd;
     struct session_op sess;
     int init;
 };

 static const struct digest_data_st {
     int nid;
     int digestlen;
     int devcryptoid;
 } digest_data[] = {
 #ifndef OPENSSL_NO_MD5
     { NID_md5, 16, CRYPTO_MD5 },
 #endif
     { NID_sha1, 20, CRYPTO_SHA1 },
 #ifndef OPENSSL_NO_RMD160
 # if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_RIPEMD160)
     { NID_ripemd160, 20, CRYPTO_RIPEMD160 },
 # endif
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_224)
     { NID_sha224, 224 / 8, CRYPTO_SHA2_224 },
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_256)
     { NID_sha256, 256 / 8, CRYPTO_SHA2_256 },
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_384)
     { NID_sha384, 384 / 8, CRYPTO_SHA2_384 },
 #endif
 #if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_512)
     { NID_sha512, 512 / 8, CRYPTO_SHA2_512 },
 #endif
 };

 static size_t get_digest_data_index(int nid)
 {
     size_t i;

     for (i = 0; i < OSSL_NELEM(digest_data); i++)
         if (nid == digest_data[i].nid)
             return i;

     /*
      * Code further down must make sure that only NIDs in the table above
      * are used.  If any other NID reaches this function, there's a grave
      * coding error further down.
      */
     assert("Code that never should be reached" == NULL);
     return -1;
 }

 static const struct digest_data_st *get_digest_data(int nid)
 {
     return &digest_data[get_digest_data_index(nid)];
 }

 /*
  * Following are the four necessary functions to map OpenSSL functionality
  * with cryptodev.
  */

 static int digest_init(EVP_MD_CTX *ctx)
 {
     struct digest_ctx *digest_ctx =
         (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
     const struct digest_data_st *digest_d =
         get_digest_data(EVP_MD_CTX_type(ctx));

     if (digest_ctx->init == 0
         && (digest_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
         SYSerr(SYS_F_OPEN, errno);
         return 0;
     }

     digest_ctx->init = 1;

     memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess));
     digest_ctx->sess.mac = digest_d->devcryptoid;
     if (ioctl(digest_ctx->cfd, CIOCGSESSION, &digest_ctx->sess) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         close(digest_ctx->cfd);
         return 0;
     }

     return 1;
 }

 static int digest_op(struct digest_ctx *ctx, const void *src, size_t srclen,
                      void *res, unsigned int flags)
 {
     struct crypt_op cryp;

     memset(&cryp, 0, sizeof(cryp));
     cryp.ses = ctx->sess.ses;
     cryp.len = srclen;
     cryp.src = (void *)src;
     cryp.dst = NULL;
     cryp.mac = res;
     cryp.flags = flags;
     return ioctl(ctx->cfd, CIOCCRYPT, &cryp);
 }

 static int digest_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 {
     struct digest_ctx *digest_ctx =
         (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

     if (count == 0)
         return 1;

     if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         return 0;
     }

     return 1;
 }

 static int digest_final(EVP_MD_CTX *ctx, unsigned char *md)
 {
     struct digest_ctx *digest_ctx =
         (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

     if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         return 0;
     }
     if (ioctl(digest_ctx->cfd, CIOCFSESSION, &digest_ctx->sess) < 0) {
         SYSerr(SYS_F_IOCTL, errno);
         return 0;
     }

     return 1;
 }

 static int digest_cleanup(EVP_MD_CTX *ctx)
 {
     struct digest_ctx *digest_ctx =
         (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

     if (close(digest_ctx->cfd) < 0) {
         SYSerr(SYS_F_CLOSE, errno);
         return 0;
     }

     return 1;
 }

 /*
  * Keep a table of known nids and associated methods.
  * Note that known_digest_nids[] isn't necessarily indexed the same way as
  * digest_data[] above, which known_digest_methods[] is.
  */
 static int known_digest_nids[OSSL_NELEM(digest_data)];
 static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */
 static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, };

 static void prepare_digest_methods()
 {
     size_t i;
     struct session_op sess;
     int cfd;

     if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
         return;

     memset(&sess, 0, sizeof(sess));

     for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data);
          i++) {

         /*
          * Check that the algo is really availably by trying to open and close
          * a session.
          */
         sess.mac = digest_data[i].devcryptoid;
         if (ioctl(cfd, CIOCGSESSION, &sess) < 0
             || ioctl(cfd, CIOCFSESSION, &sess) < 0)
             continue;

         if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid,
                                                        NID_undef)) == NULL
             || !EVP_MD_meth_set_result_size(known_digest_methods[i],
                                             digest_data[i].digestlen)
             || !EVP_MD_meth_set_init(known_digest_methods[i], digest_init)
             || !EVP_MD_meth_set_update(known_digest_methods[i], digest_update)
             || !EVP_MD_meth_set_final(known_digest_methods[i], digest_final)
             || !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup)
             || !EVP_MD_meth_set_app_datasize(known_digest_methods[i],
                                              sizeof(struct digest_ctx))) {
             EVP_MD_meth_free(known_digest_methods[i]);
             known_digest_methods[i] = NULL;
         } else {
             known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
         }
     }

     close(cfd);
 }

 static const EVP_MD *get_digest_method(int nid)
 {
     size_t i = get_digest_data_index(nid);

     if (i == (size_t)-1)
         return NULL;
     return known_digest_methods[i];
 }

 static int get_digest_nids(const int **nids)
 {
     *nids = known_digest_nids;
     return known_digest_nids_amount;
 }

 static void destroy_digest_method(int nid)
 {
     size_t i = get_digest_data_index(nid);

     EVP_MD_meth_free(known_digest_methods[i]);
     known_digest_methods[i] = NULL;
 }

 static void destroy_all_digest_methods()
 {
     size_t i;

     for (i = 0; i < OSSL_NELEM(digest_data); i++)
         destroy_digest_method(digest_data[i].nid);
 }

 static int devcrypto_digests(ENGINE *e, const EVP_MD **digest,
                              const int **nids, int nid)
 {
     if (digest == NULL)
         return get_digest_nids(nids);

     *digest = get_digest_method(nid);

     return *digest != NULL;
 }

 #endif

 /******************************************************************************
  *
  * LOAD / UNLOAD
  *
  *****/

 static int devcrypto_unload(ENGINE *e)
 {
     destroy_all_cipher_methods();
 #if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
     destroy_all_digest_methods();
 #endif
     return 1;
 }
 /*
  * This engine is always built into libcrypto, so it doesn't offer any
  * ability to be dynamically loadable.
  */
 void engine_load_devcrypto_int()
 {
     ENGINE *e = NULL;

     if (access("/dev/crypto", R_OK | W_OK) < 0) {
         fprintf(stderr,
                 "/dev/crypto not present, not enabling devcrypto engine\n");
         return;
     }

     prepare_cipher_methods();
 #if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
     prepare_digest_methods();
 #endif

     if ((e = ENGINE_new()) == NULL)
         return;

     if (!ENGINE_set_id(e, "devcrypto")
         || !ENGINE_set_name(e, "/dev/crypto engine")
         || !ENGINE_set_destroy_function(e, devcrypto_unload)

 /*
  * Asymmetric ciphers aren't well supported with /dev/crypto.  Among the BSD
  * implementations, it seems to only exist in FreeBSD, and regarding the
  * parameters in its crypt_kop, the manual crypto(4) has this to say:
  *
  *    The semantics of these arguments are currently undocumented.
  *
  * Reading through the FreeBSD source code doesn't give much more than
  * their CRK_MOD_EXP implementation for ubsec.
  *
  * It doesn't look much better with cryptodev-linux.  They have the crypt_kop
  * structure as well as the command (CRK_*) in cryptodev.h, but no support
  * seems to be implemented at all for the moment.
  *
  * At the time of writing, it seems impossible to write proper support for
  * FreeBSD's asym features without some very deep knowledge and access to
  * specific kernel modules.
  *
  * /Richard Levitte, 2017-05-11
  */
 #if 0
 # ifndef OPENSSL_NO_RSA
         || !ENGINE_set_RSA(e, devcrypto_rsa)
 # endif
 # ifndef OPENSSL_NO_DSA
         || !ENGINE_set_DSA(e, devcrypto_dsa)
 # endif
 # ifndef OPENSSL_NO_DH
         || !ENGINE_set_DH(e, devcrypto_dh)
 # endif
 # ifndef OPENSSL_NO_EC
         || !ENGINE_set_EC(e, devcrypto_ec)
 # endif
 #endif
         || !ENGINE_set_ciphers(e, devcrypto_ciphers)
 #if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
         || !ENGINE_set_digests(e, devcrypto_digests)
 #endif
         ) {
         ENGINE_free(e);
         return;
     }

     ENGINE_add(e);
     ENGINE_free(e);          /* Loose our local reference */
     ERR_clear_error();
 }
	/*
	* Copyright 2017 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
	*/

	#include "e_os.h"
	#include <string.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <sys/ioctl.h>
	#include <unistd.h>
	#include <assert.h>

	#include <openssl/evp.h>
	#include <openssl/err.h>
	#include <openssl/engine.h>
	#include <openssl/objects.h>
	#include <crypto/cryptodev.h>

	#include "internal/engine.h"

	#ifdef CRYPTO_ALGORITHM_MIN
	# define CHECK_BSD_STYLE_MACROS
	#endif

	/******************************************************************************
	*
	* Ciphers
	*
	* Because they all do the same basic operation, we have only one set of
	* method functions for them all to share, and a mapping table between
	* NIDs and cryptodev IDs, with all the necessary size data.
	*
	*****/

	struct cipher_ctx {
	int cfd;
	struct session_op sess;

	/* to pass from init to do_cipher */
	const unsigned char *iv;
	int op; /* COP_ENCRYPT or COP_DECRYPT */
	};

	static const struct cipher_data_st {
	int nid;
	int blocksize;
	int keylen;
	int ivlen;
	int flags;
	int devcryptoid;
	} cipher_data[] = {
	#ifndef OPENSSL_NO_DES
	{ NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC },
	{ NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC },
	#endif
	#ifndef OPENSSL_NO_BF
	{ NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC },
	#endif
	#ifndef OPENSSL_NO_CAST
	{ NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC },
	#endif
	{ NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
	{ NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
	{ NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
	#ifndef OPENSSL_NO_RC4
	{ NID_rc4, 1, 16, 0, CRYPTO_ARC4 },
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_AES_CTR)
	{ NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
	{ NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
	{ NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
	#endif
	#if 0 /* Not yet supported */
	{ NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
	{ NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) \|\| defined(CRYPTO_AES_ECB)
	{ NID_aes_128_ecb, 16, 128 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
	{ NID_aes_192_ecb, 16, 192 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
	{ NID_aes_256_ecb, 16, 256 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
	#endif
	#if 0 /* Not yet supported */
	{ NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
	{ NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
	{ NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
	#endif
	#ifndef OPENSSL_NO_CAMELLIA
	{ NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE,
	CRYPTO_CAMELLIA_CBC },
	{ NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE,
	CRYPTO_CAMELLIA_CBC },
	{ NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE,
	CRYPTO_CAMELLIA_CBC },
	#endif
	};

	static size_t get_cipher_data_index(int nid)
	{
	size_t i;

	for (i = 0; i < OSSL_NELEM(cipher_data); i++)
	if (nid == cipher_data[i].nid)
	return i;

	/*
	* Code further down must make sure that only NIDs in the table above
	* are used. If any other NID reaches this function, there's a grave
	* coding error further down.
	*/
	assert("Code that never should be reached" == NULL);
	return -1;
	}

	static const struct cipher_data_st *get_cipher_data(int nid)
	{
	return &cipher_data[get_cipher_data_index(nid)];
	}

	/*
	* Following are the three necessary functions to map OpenSSL functionality
	* with cryptodev.
	*/

	static int cipher_init(EVP_CIPHER_CTX ctx, const unsigned char key,
	const unsigned char *iv, int enc)
	{
	struct cipher_ctx *cipher_ctx =
	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
	const struct cipher_data_st *cipher_d =
	get_cipher_data(EVP_CIPHER_CTX_nid(ctx));

	if ((cipher_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
	SYSerr(SYS_F_OPEN, errno);
	return 0;
	}

	memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
	cipher_ctx->sess.cipher = cipher_d->devcryptoid;
	cipher_ctx->sess.keylen = cipher_d->keylen;
	cipher_ctx->sess.key = (void *)key;
	cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT;
	if (ioctl(cipher_ctx->cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	close(cipher_ctx->cfd);
	return 0;
	}

	return 1;
	}

	static int cipher_do_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
	const unsigned char *in, size_t inl)
	{
	struct cipher_ctx *cipher_ctx =
	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
	struct crypt_op cryp;
	#if !defined(COP_FLAG_WRITE_IV)
	unsigned char saved_iv[EVP_MAX_IV_LENGTH];
	#endif

	memset(&cryp, 0, sizeof(cryp));
	cryp.ses = cipher_ctx->sess.ses;
	cryp.len = inl;
	cryp.src = (void *)in;
	cryp.dst = (void *)out;
	cryp.iv = (void *)EVP_CIPHER_CTX_iv_noconst(ctx);
	cryp.op = cipher_ctx->op;
	#if !defined(COP_FLAG_WRITE_IV)
	cryp.flags = 0;

	if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
	assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
	if (!EVP_CIPHER_CTX_encrypting(ctx)) {
	unsigned char *ivptr = in + inl - EVP_CIPHER_CTX_iv_length(ctx);

	memcpy(saved_iv, ivptr, EVP_CIPHER_CTX_iv_length(ctx));
	}
	}
	#else
	cryp.flags = COP_FLAG_WRITE_IV;
	#endif

	if (ioctl(cipher_ctx->cfd, CIOCCRYPT, &cryp) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	return 0;
	}

	#if !defined(COP_FLAG_WRITE_IV)
	if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
	unsigned char *ivptr = saved_iv;

	assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
	if (!EVP_CIPHER_CTX_encrypting(ctx))
	ivptr = out + inl - EVP_CIPHER_CTX_iv_length(ctx);

	memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), ivptr,
	EVP_CIPHER_CTX_iv_length(ctx));
	}
	#endif

	return 1;
	}

	static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
	{
	struct cipher_ctx *cipher_ctx =
	(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);

	if (ioctl(cipher_ctx->cfd, CIOCFSESSION, &cipher_ctx->sess) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	return 0;
	}
	if (close(cipher_ctx->cfd) < 0) {
	SYSerr(SYS_F_CLOSE, errno);
	return 0;
	}

	return 1;
	}

	/*
	* Keep a table of known nids and associated methods.
	* Note that known_cipher_nids[] isn't necessarily indexed the same way as
	* cipher_data[] above, which known_cipher_methods[] is.
	*/
	static int known_cipher_nids[OSSL_NELEM(cipher_data)];
	static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
	static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };

	static void prepare_cipher_methods()
	{
	size_t i;
	struct session_op sess;
	int cfd;

	if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
	return;

	memset(&sess, 0, sizeof(sess));
	sess.key = (void *)"01234567890123456789012345678901234567890123456789";

	for (i = 0, known_cipher_nids_amount = 0;
	i < OSSL_NELEM(cipher_data); i++) {

	/*
	* Check that the algo is really availably by trying to open and close
	* a session.
	*/
	sess.cipher = cipher_data[i].devcryptoid;
	sess.keylen = cipher_data[i].keylen;
	if (ioctl(cfd, CIOCGSESSION, &sess) < 0
	\|\| ioctl(cfd, CIOCFSESSION, &sess) < 0)
	continue;

	if ((known_cipher_methods[i] =
	EVP_CIPHER_meth_new(cipher_data[i].nid,
	cipher_data[i].blocksize,
	cipher_data[i].keylen)) == NULL
	\|\| !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
	cipher_data[i].ivlen)
	\|\| !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
	cipher_data[i].flags
	\| EVP_CIPH_FLAG_DEFAULT_ASN1)
	\|\| !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
	\|\| !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
	cipher_do_cipher)
	\|\| !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i],
	cipher_cleanup)
	\|\| !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i],
	sizeof(struct cipher_ctx))) {
	EVP_CIPHER_meth_free(known_cipher_methods[i]);
	known_cipher_methods[i] = NULL;
	} else {
	known_cipher_nids[known_cipher_nids_amount++] =
	cipher_data[i].nid;
	}
	}

	close(cfd);
	}

	static const EVP_CIPHER *get_cipher_method(int nid)
	{
	size_t i = get_cipher_data_index(nid);

	if (i == (size_t)-1)
	return NULL;
	return known_cipher_methods[i];
	}

	static int get_cipher_nids(const int **nids)
	{
	*nids = known_cipher_nids;
	return known_cipher_nids_amount;
	}

	static void destroy_cipher_method(int nid)
	{
	size_t i = get_cipher_data_index(nid);

	EVP_CIPHER_meth_free(known_cipher_methods[i]);
	known_cipher_methods[i] = NULL;
	}

	static void destroy_all_cipher_methods()
	{
	size_t i;

	for (i = 0; i < OSSL_NELEM(cipher_data); i++)
	destroy_cipher_method(cipher_data[i].nid);
	}

	static int devcrypto_ciphers(ENGINE e, const EVP_CIPHER *cipher,
	const int **nids, int nid)
	{
	if (cipher == NULL)
	return get_cipher_nids(nids);

	*cipher = get_cipher_method(nid);

	return *cipher != NULL;
	}

	/*
	* We only support digests if the cryptodev implementation supports multiple
	* data updates. Otherwise, we would be forced to maintain a cache, which is
	* perilous if there's a lot of data coming in (if someone wants to checksum
	* an OpenSSL tarball, for example).
	*/
	#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)

	/******************************************************************************
	*
	* Digests
	*
	* Because they all do the same basic operation, we have only one set of
	* method functions for them all to share, and a mapping table between
	* NIDs and cryptodev IDs, with all the necessary size data.
	*
	*****/

	struct digest_ctx {
	int cfd;
	struct session_op sess;
	int init;
	};

	static const struct digest_data_st {
	int nid;
	int digestlen;
	int devcryptoid;
	} digest_data[] = {
	#ifndef OPENSSL_NO_MD5
	{ NID_md5, 16, CRYPTO_MD5 },
	#endif
	{ NID_sha1, 20, CRYPTO_SHA1 },
	#ifndef OPENSSL_NO_RMD160
	# if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_RIPEMD160)
	{ NID_ripemd160, 20, CRYPTO_RIPEMD160 },
	# endif
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_224)
	{ NID_sha224, 224 / 8, CRYPTO_SHA2_224 },
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_256)
	{ NID_sha256, 256 / 8, CRYPTO_SHA2_256 },
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_384)
	{ NID_sha384, 384 / 8, CRYPTO_SHA2_384 },
	#endif
	#if !defined(CHECK_BSD_STYLE_MACROS) && defined(CRYPTO_SHA2_512)
	{ NID_sha512, 512 / 8, CRYPTO_SHA2_512 },
	#endif
	};

	static size_t get_digest_data_index(int nid)
	{
	size_t i;

	for (i = 0; i < OSSL_NELEM(digest_data); i++)
	if (nid == digest_data[i].nid)
	return i;

	/*
	* Code further down must make sure that only NIDs in the table above
	* are used. If any other NID reaches this function, there's a grave
	* coding error further down.
	*/
	assert("Code that never should be reached" == NULL);
	return -1;
	}

	static const struct digest_data_st *get_digest_data(int nid)
	{
	return &digest_data[get_digest_data_index(nid)];
	}

	/*
	* Following are the four necessary functions to map OpenSSL functionality
	* with cryptodev.
	*/

	static int digest_init(EVP_MD_CTX *ctx)
	{
	struct digest_ctx *digest_ctx =
	(struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
	const struct digest_data_st *digest_d =
	get_digest_data(EVP_MD_CTX_type(ctx));

	if (digest_ctx->init == 0
	&& (digest_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
	SYSerr(SYS_F_OPEN, errno);
	return 0;
	}

	digest_ctx->init = 1;

	memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess));
	digest_ctx->sess.mac = digest_d->devcryptoid;
	if (ioctl(digest_ctx->cfd, CIOCGSESSION, &digest_ctx->sess) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	close(digest_ctx->cfd);
	return 0;
	}

	return 1;
	}

	static int digest_op(struct digest_ctx ctx, const void src, size_t srclen,
	void *res, unsigned int flags)
	{
	struct crypt_op cryp;

	memset(&cryp, 0, sizeof(cryp));
	cryp.ses = ctx->sess.ses;
	cryp.len = srclen;
	cryp.src = (void *)src;
	cryp.dst = NULL;
	cryp.mac = res;
	cryp.flags = flags;
	return ioctl(ctx->cfd, CIOCCRYPT, &cryp);
	}

	static int digest_update(EVP_MD_CTX ctx, const void data, size_t count)
	{
	struct digest_ctx *digest_ctx =
	(struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

	if (count == 0)
	return 1;

	if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	return 0;
	}

	return 1;
	}

	static int digest_final(EVP_MD_CTX ctx, unsigned char md)
	{
	struct digest_ctx *digest_ctx =
	(struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

	if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	return 0;
	}
	if (ioctl(digest_ctx->cfd, CIOCFSESSION, &digest_ctx->sess) < 0) {
	SYSerr(SYS_F_IOCTL, errno);
	return 0;
	}

	return 1;
	}

	static int digest_cleanup(EVP_MD_CTX *ctx)
	{
	struct digest_ctx *digest_ctx =
	(struct digest_ctx *)EVP_MD_CTX_md_data(ctx);

	if (close(digest_ctx->cfd) < 0) {
	SYSerr(SYS_F_CLOSE, errno);
	return 0;
	}

	return 1;
	}

	/*
	* Keep a table of known nids and associated methods.
	* Note that known_digest_nids[] isn't necessarily indexed the same way as
	* digest_data[] above, which known_digest_methods[] is.
	*/
	static int known_digest_nids[OSSL_NELEM(digest_data)];
	static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */
	static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, };

	static void prepare_digest_methods()
	{
	size_t i;
	struct session_op sess;
	int cfd;

	if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
	return;

	memset(&sess, 0, sizeof(sess));

	for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data);
	i++) {

	/*
	* Check that the algo is really availably by trying to open and close
	* a session.
	*/
	sess.mac = digest_data[i].devcryptoid;
	if (ioctl(cfd, CIOCGSESSION, &sess) < 0
	\|\| ioctl(cfd, CIOCFSESSION, &sess) < 0)
	continue;

	if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid,
	NID_undef)) == NULL
	\|\| !EVP_MD_meth_set_result_size(known_digest_methods[i],
	digest_data[i].digestlen)
	\|\| !EVP_MD_meth_set_init(known_digest_methods[i], digest_init)
	\|\| !EVP_MD_meth_set_update(known_digest_methods[i], digest_update)
	\|\| !EVP_MD_meth_set_final(known_digest_methods[i], digest_final)
	\|\| !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup)
	\|\| !EVP_MD_meth_set_app_datasize(known_digest_methods[i],
	sizeof(struct digest_ctx))) {
	EVP_MD_meth_free(known_digest_methods[i]);
	known_digest_methods[i] = NULL;
	} else {
	known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
	}
	}

	close(cfd);
	}

	static const EVP_MD *get_digest_method(int nid)
	{
	size_t i = get_digest_data_index(nid);

	if (i == (size_t)-1)
	return NULL;
	return known_digest_methods[i];
	}

	static int get_digest_nids(const int **nids)
	{
	*nids = known_digest_nids;
	return known_digest_nids_amount;
	}

	static void destroy_digest_method(int nid)
	{
	size_t i = get_digest_data_index(nid);

	EVP_MD_meth_free(known_digest_methods[i]);
	known_digest_methods[i] = NULL;
	}

	static void destroy_all_digest_methods()
	{
	size_t i;

	for (i = 0; i < OSSL_NELEM(digest_data); i++)
	destroy_digest_method(digest_data[i].nid);
	}

	static int devcrypto_digests(ENGINE e, const EVP_MD *digest,
	const int **nids, int nid)
	{
	if (digest == NULL)
	return get_digest_nids(nids);

	*digest = get_digest_method(nid);

	return *digest != NULL;
	}

	#endif

	/******************************************************************************
	*
	* LOAD / UNLOAD
	*
	*****/

	static int devcrypto_unload(ENGINE *e)
	{
	destroy_all_cipher_methods();
	#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
	destroy_all_digest_methods();
	#endif
	return 1;
	}
	/*
	* This engine is always built into libcrypto, so it doesn't offer any
	* ability to be dynamically loadable.
	*/
	void engine_load_devcrypto_int()
	{
	ENGINE *e = NULL;

	if (access("/dev/crypto", R_OK \| W_OK) < 0) {
	fprintf(stderr,
	"/dev/crypto not present, not enabling devcrypto engine\n");
	return;
	}

	prepare_cipher_methods();
	#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
	prepare_digest_methods();
	#endif

	if ((e = ENGINE_new()) == NULL)
	return;

	if (!ENGINE_set_id(e, "devcrypto")
	\|\| !ENGINE_set_name(e, "/dev/crypto engine")
	\|\| !ENGINE_set_destroy_function(e, devcrypto_unload)

	/*
	* Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD
	* implementations, it seems to only exist in FreeBSD, and regarding the
	* parameters in its crypt_kop, the manual crypto(4) has this to say:
	*
	* The semantics of these arguments are currently undocumented.
	*
	* Reading through the FreeBSD source code doesn't give much more than
	* their CRK_MOD_EXP implementation for ubsec.
	*
	* It doesn't look much better with cryptodev-linux. They have the crypt_kop
	* structure as well as the command (CRK_*) in cryptodev.h, but no support
	* seems to be implemented at all for the moment.
	*
	* At the time of writing, it seems impossible to write proper support for
	* FreeBSD's asym features without some very deep knowledge and access to
	* specific kernel modules.
	*
	* /Richard Levitte, 2017-05-11
	*/
	#if 0
	# ifndef OPENSSL_NO_RSA
	\|\| !ENGINE_set_RSA(e, devcrypto_rsa)
	# endif
	# ifndef OPENSSL_NO_DSA
	\|\| !ENGINE_set_DSA(e, devcrypto_dsa)
	# endif
	# ifndef OPENSSL_NO_DH
	\|\| !ENGINE_set_DH(e, devcrypto_dh)
	# endif
	# ifndef OPENSSL_NO_EC
	\|\| !ENGINE_set_EC(e, devcrypto_ec)
	# endif
	#endif
	\|\| !ENGINE_set_ciphers(e, devcrypto_ciphers)
	#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
	\|\| !ENGINE_set_digests(e, devcrypto_digests)
	#endif
	) {
	ENGINE_free(e);
	return;
	}

	ENGINE_add(e);
	ENGINE_free(e); /* Loose our local reference */
	ERR_clear_error();
	}