text: /*
   * Copyright (c) 2002 Bob Beck <beck@openbsd.org>
   * Copyright (c) 2002 Theo de Raadt
   * Copyright (c) 2002 Markus Friedl
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  #include <openssl/objects.h>
  #include <openssl/engine.h>
  #include <openssl/evp.h>
  #include <openssl/bn.h>
  
  #if (defined(__unix__) || defined(unix)) && !defined(USG) && \
          (defined(OpenBSD) || defined(__FreeBSD__))
  # include <sys/param.h>
  # if (OpenBSD >= 200112) || ((__FreeBSD_version >= 470101 && __FreeBSD_version < 500000) || __FreeBSD_version >= 500041)
  #  define HAVE_CRYPTODEV
  # endif
  # if (OpenBSD >= 200110)
  #  define HAVE_SYSLOG_R
  # endif
  #endif
  
  #include <sys/types.h>
  #ifdef HAVE_CRYPTODEV
  # include <crypto/cryptodev.h>
  # include <sys/ioctl.h>
  # include <errno.h>
  # include <stdio.h>
  # include <unistd.h>
  # include <fcntl.h>
  # include <stdarg.h>
  # include <syslog.h>
  # include <errno.h>
  # include <string.h>
  #endif
  #include <openssl/dh.h>
  #include <openssl/dsa.h>
  #include <openssl/err.h>
  #include <openssl/rsa.h>
  
  #ifndef HAVE_CRYPTODEV
  
  void ENGINE_load_cryptodev(void)
  {
      /* This is a NOP on platforms without /dev/crypto */
      return;
  }
  
  #else
  
  struct dev_crypto_state {
      struct session_op d_sess;
      int d_fd;
  # ifdef USE_CRYPTODEV_DIGESTS
      char dummy_mac_key[HASH_MAX_LEN];
      unsigned char digest_res[HASH_MAX_LEN];
      char *mac_data;
      int mac_len;
  # endif
  };
  
  static u_int32_t cryptodev_asymfeat = 0;
  
  static int get_asym_dev_crypto(void);
  static int open_dev_crypto(void);
  static int get_dev_crypto(void);
  static int get_cryptodev_ciphers(const int **cnids);
  # ifdef USE_CRYPTODEV_DIGESTS
  static int get_cryptodev_digests(const int **cnids);
  # endif
  static int cryptodev_usable_ciphers(const int **nids);
  static int cryptodev_usable_digests(const int **nids);
  static int cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                              const unsigned char *in, size_t inl);
  static int cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                                const unsigned char *iv, int enc);
  static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx);
  static int cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
                                      const int **nids, int nid);
  static int cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest,
                                      const int **nids, int nid);
  static int bn2crparam(const BIGNUM *a, struct crparam *crp);
  static int crparam2bn(struct crparam *crp, BIGNUM *a);
  static void zapparams(struct crypt_kop *kop);
  static int cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r,
                            int slen, BIGNUM *s);
  
  static int cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a,
                                  const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
                                  BN_MONT_CTX *m_ctx);
  static int cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
                                         BN_CTX *ctx);
  static int cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
                                   BN_CTX *ctx);
  static int cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a,
                                      const BIGNUM *p, const BIGNUM *m,
                                      BN_CTX *ctx, BN_MONT_CTX *m_ctx);
  static int cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g,
                                       BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2,
                                       BIGNUM *p, BN_CTX *ctx,
                                       BN_MONT_CTX *mont);
  static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst, int dlen,
                                        DSA *dsa);
  static int cryptodev_dsa_verify(const unsigned char *dgst, int dgst_len,
                                  DSA_SIG *sig, DSA *dsa);
  static int cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
                                  const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
                                  BN_MONT_CTX *m_ctx);
  static int cryptodev_dh_compute_key(unsigned char *key, const BIGNUM *pub_key,
                                      DH *dh);
  static int cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p,
                            void (*f) (void));
  void ENGINE_load_cryptodev(void);
  
  static const ENGINE_CMD_DEFN cryptodev_defns[] = {
      {0, NULL, NULL, 0}
  };
  
  static struct {
      int id;
      int nid;
      int ivmax;
      int keylen;
  } ciphers[] = {
      {
          CRYPTO_ARC4, NID_rc4, 0, 16,
      },
      {
          CRYPTO_DES_CBC, NID_des_cbc, 8, 8,
      },
      {
          CRYPTO_3DES_CBC, NID_des_ede3_cbc, 8, 24,
      },
      {
          CRYPTO_AES_CBC, NID_aes_128_cbc, 16, 16,
      },
      {
          CRYPTO_AES_CBC, NID_aes_192_cbc, 16, 24,
      },
      {
          CRYPTO_AES_CBC, NID_aes_256_cbc, 16, 32,
      },
  # ifdef CRYPTO_AES_CTR
      {
          CRYPTO_AES_CTR, NID_aes_128_ctr, 14, 16,
      },
      {
          CRYPTO_AES_CTR, NID_aes_192_ctr, 14, 24,
      },
      {
          CRYPTO_AES_CTR, NID_aes_256_ctr, 14, 32,
      },
  # endif
      {
          CRYPTO_BLF_CBC, NID_bf_cbc, 8, 16,
      },
      {
          CRYPTO_CAST_CBC, NID_cast5_cbc, 8, 16,
      },
      {
          CRYPTO_SKIPJACK_CBC, NID_undef, 0, 0,
      },
      {
          0, NID_undef, 0, 0,
      },
  };
  
  # ifdef USE_CRYPTODEV_DIGESTS
  static struct {
      int id;
      int nid;
      int keylen;
  } digests[] = {
      {
          CRYPTO_MD5_HMAC, NID_hmacWithMD5, 16
      },
      {
          CRYPTO_SHA1_HMAC, NID_hmacWithSHA1, 20
      },
      {
          CRYPTO_RIPEMD160_HMAC, NID_ripemd160, 16
          /* ? */
      },
      {
          CRYPTO_MD5_KPDK, NID_undef, 0
      },
      {
          CRYPTO_SHA1_KPDK, NID_undef, 0
      },
      {
          CRYPTO_MD5, NID_md5, 16
      },
      {
          CRYPTO_SHA1, NID_sha1, 20
      },
      {
          0, NID_undef, 0
      },
  };
  # endif
  
  /*
   * Return a fd if /dev/crypto seems usable, 0 otherwise.
   */
  static int open_dev_crypto(void)
  {
      static int fd = -1;
  
      if (fd == -1) {
          if ((fd = open("/dev/crypto", O_RDWR, 0)) == -1)
              return (-1);
          /* close on exec */
          if (fcntl(fd, F_SETFD, 1) == -1) {
              close(fd);
              fd = -1;
              return (-1);
          }
      }
      return (fd);
  }
  
  static int get_dev_crypto(void)
  {
      int fd, retfd;
  
      if ((fd = open_dev_crypto()) == -1)
          return (-1);
  # ifndef CRIOGET_NOT_NEEDED
      if (ioctl(fd, CRIOGET, &retfd) == -1)
          return (-1);
  
      /* close on exec */
      if (fcntl(retfd, F_SETFD, 1) == -1) {
          close(retfd);
          return (-1);
      }
  # else
      retfd = fd;
  # endif
      return (retfd);
  }
  
  static void put_dev_crypto(int fd)
  {
  # ifndef CRIOGET_NOT_NEEDED
      close(fd);
  # endif
  }
  
  /* Caching version for asym operations */
  static int get_asym_dev_crypto(void)
  {
      static int fd = -1;
  
      if (fd == -1)
          fd = get_dev_crypto();
      return fd;
  }
  
  /*
   * Find out what ciphers /dev/crypto will let us have a session for.
   * XXX note, that some of these openssl doesn't deal with yet!
   * returning them here is harmless, as long as we return NULL
   * when asked for a handler in the cryptodev_engine_ciphers routine
   */
  static int get_cryptodev_ciphers(const int **cnids)
  {
      static int nids[CRYPTO_ALGORITHM_MAX];
      struct session_op sess;
      int fd, i, count = 0;
  
      if ((fd = get_dev_crypto()) < 0) {
          *cnids = NULL;
          return (0);
      }
      memset(&sess, 0, sizeof(sess));
      sess.key = (caddr_t) "123456789abcdefghijklmno";
  
      for (i = 0; ciphers[i].id && count < CRYPTO_ALGORITHM_MAX; i++) {
          if (ciphers[i].nid == NID_undef)
              continue;
          sess.cipher = ciphers[i].id;
          sess.keylen = ciphers[i].keylen;
          sess.mac = 0;
          if (ioctl(fd, CIOCGSESSION, &sess) != -1 &&
              ioctl(fd, CIOCFSESSION, &sess.ses) != -1)
              nids[count++] = ciphers[i].nid;
      }
      put_dev_crypto(fd);
  
      if (count > 0)
          *cnids = nids;
      else
          *cnids = NULL;
      return (count);
  }
  
  # ifdef USE_CRYPTODEV_DIGESTS
  /*
   * Find out what digests /dev/crypto will let us have a session for.
   * XXX note, that some of these openssl doesn't deal with yet!
   * returning them here is harmless, as long as we return NULL
   * when asked for a handler in the cryptodev_engine_digests routine
   */
  static int get_cryptodev_digests(const int **cnids)
  {
      static int nids[CRYPTO_ALGORITHM_MAX];
      struct session_op sess;
      int fd, i, count = 0;
  
      if ((fd = get_dev_crypto()) < 0) {
          *cnids = NULL;
          return (0);
      }
      memset(&sess, 0, sizeof(sess));
      sess.mackey = (caddr_t) "123456789abcdefghijklmno";
      for (i = 0; digests[i].id && count < CRYPTO_ALGORITHM_MAX; i++) {
          if (digests[i].nid == NID_undef)
              continue;
          sess.mac = digests[i].id;
          sess.mackeylen = digests[i].keylen;
          sess.cipher = 0;
          if (ioctl(fd, CIOCGSESSION, &sess) != -1 &&
              ioctl(fd, CIOCFSESSION, &sess.ses) != -1)
              nids[count++] = digests[i].nid;
      }
      put_dev_crypto(fd);
  
      if (count > 0)
          *cnids = nids;
      else
          *cnids = NULL;
      return (count);
  }
  # endif                         /* 0 */
  
  /*
   * Find the useable ciphers|digests from dev/crypto - this is the first
   * thing called by the engine init crud which determines what it
   * can use for ciphers from this engine. We want to return
   * only what we can do, anythine else is handled by software.
   *
   * If we can't initialize the device to do anything useful for
   * any reason, we want to return a NULL array, and 0 length,
   * which forces everything to be done is software. By putting
   * the initalization of the device in here, we ensure we can
   * use this engine as the default, and if for whatever reason
   * /dev/crypto won't do what we want it will just be done in
   * software
   *
   * This can (should) be greatly expanded to perhaps take into
   * account speed of the device, and what we want to do.
   * (although the disabling of particular alg's could be controlled
   * by the device driver with sysctl's.) - this is where we
   * want most of the decisions made about what we actually want
   * to use from /dev/crypto.
   */
  static int cryptodev_usable_ciphers(const int **nids)
  {
      return (get_cryptodev_ciphers(nids));
  }
  
  static int cryptodev_usable_digests(const int **nids)
  {
  # ifdef USE_CRYPTODEV_DIGESTS
      return (get_cryptodev_digests(nids));
  # else
      /*
       * XXXX just disable all digests for now, because it sucks.
       * we need a better way to decide this - i.e. I may not
       * want digests on slow cards like hifn on fast machines,
       * but might want them on slow or loaded machines, etc.
       * will also want them when using crypto cards that don't
       * suck moose gonads - would be nice to be able to decide something
       * as reasonable default without having hackery that's card dependent.
       * of course, the default should probably be just do everything,
       * with perhaps a sysctl to turn algoritms off (or have them off
       * by default) on cards that generally suck like the hifn.
       */
      *nids = NULL;
      return (0);
  # endif
  }
  
  static int
  cryptodev_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                   const unsigned char *in, size_t inl)
  {
      struct crypt_op cryp;
      struct dev_crypto_state *state = ctx->cipher_data;
      struct session_op *sess = &state->d_sess;
      const void *iiv;
      unsigned char save_iv[EVP_MAX_IV_LENGTH];
  
      if (state->d_fd < 0)
          return (0);
      if (!inl)
          return (1);
      if ((inl % ctx->cipher->block_size) != 0)
          return (0);
  
      memset(&cryp, 0, sizeof(cryp));
  
      cryp.ses = sess->ses;
      cryp.flags = 0;
      cryp.len = inl;
      cryp.src = (caddr_t) in;
      cryp.dst = (caddr_t) out;
      cryp.mac = 0;
  
      cryp.op = ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT;
  
      if (ctx->cipher->iv_len) {
          cryp.iv = (caddr_t) ctx->iv;
          if (!ctx->encrypt) {
              iiv = in + inl - ctx->cipher->iv_len;
              memcpy(save_iv, iiv, ctx->cipher->iv_len);
          }
      } else
          cryp.iv = NULL;
  
      if (ioctl(state->d_fd, CIOCCRYPT, &cryp) == -1) {
          /*
           * XXX need better errror handling this can fail for a number of
           * different reasons.
           */
          return (0);
      }
  
      if (ctx->cipher->iv_len) {
          if (ctx->encrypt)
              iiv = out + inl - ctx->cipher->iv_len;
          else
              iiv = save_iv;
          memcpy(ctx->iv, iiv, ctx->cipher->iv_len);
      }
      return (1);
  }
  
  static int
  cryptodev_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                     const unsigned char *iv, int enc)
  {
      struct dev_crypto_state *state = ctx->cipher_data;
      struct session_op *sess = &state->d_sess;
      int cipher = -1, i;
  
      for (i = 0; ciphers[i].id; i++)
          if (ctx->cipher->nid == ciphers[i].nid &&
              ctx->cipher->iv_len <= ciphers[i].ivmax &&
              ctx->key_len == ciphers[i].keylen) {
              cipher = ciphers[i].id;
              break;
          }
  
      if (!ciphers[i].id) {
          state->d_fd = -1;
          return (0);
      }
  
      memset(sess, 0, sizeof(*sess));
  
      if ((state->d_fd = get_dev_crypto()) < 0)
          return (0);
  
      sess->key = (caddr_t) key;
      sess->keylen = ctx->key_len;
      sess->cipher = cipher;
  
      if (ioctl(state->d_fd, CIOCGSESSION, sess) == -1) {
          put_dev_crypto(state->d_fd);
          state->d_fd = -1;
          return (0);
      }
      return (1);
  }
  
  /*
   * free anything we allocated earlier when initting a
   * session, and close the session.
   */
  static int cryptodev_cleanup(EVP_CIPHER_CTX *ctx)
  {
      int ret = 0;
      struct dev_crypto_state *state = ctx->cipher_data;
      struct session_op *sess = &state->d_sess;
  
      if (state->d_fd < 0)
          return (0);
  
      /*
       * XXX if this ioctl fails, someting's wrong. the invoker may have called
       * us with a bogus ctx, or we could have a device that for whatever
       * reason just doesn't want to play ball - it's not clear what's right
       * here - should this be an error? should it just increase a counter,
       * hmm. For right now, we return 0 - I don't believe that to be "right".
       * we could call the gorpy openssl lib error handlers that print messages
       * to users of the library. hmm..
       */
  
      if (ioctl(state->d_fd, CIOCFSESSION, &sess->ses) == -1) {
          ret = 0;
      } else {
          ret = 1;
      }
      put_dev_crypto(state->d_fd);
      state->d_fd = -1;
  
      return (ret);
  }
  
  /*
   * libcrypto EVP stuff - this is how we get wired to EVP so the engine
   * gets called when libcrypto requests a cipher NID.
   */
  
  /* RC4 */
  static const EVP_CIPHER cryptodev_rc4 = {
      NID_rc4,
      1, 16, 0,
      EVP_CIPH_VARIABLE_LENGTH,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      NULL,
      NULL,
      NULL
  };
  
  /* DES CBC EVP */
  static const EVP_CIPHER cryptodev_des_cbc = {
      NID_des_cbc,
      8, 8, 8,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  /* 3DES CBC EVP */
  static const EVP_CIPHER cryptodev_3des_cbc = {
      NID_des_ede3_cbc,
      8, 24, 8,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  static const EVP_CIPHER cryptodev_bf_cbc = {
      NID_bf_cbc,
      8, 16, 8,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  static const EVP_CIPHER cryptodev_cast_cbc = {
      NID_cast5_cbc,
      8, 16, 8,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  static const EVP_CIPHER cryptodev_aes_cbc = {
      NID_aes_128_cbc,
      16, 16, 16,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  static const EVP_CIPHER cryptodev_aes_192_cbc = {
      NID_aes_192_cbc,
      16, 24, 16,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  static const EVP_CIPHER cryptodev_aes_256_cbc = {
      NID_aes_256_cbc,
      16, 32, 16,
      EVP_CIPH_CBC_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  # ifdef CRYPTO_AES_CTR
  const EVP_CIPHER cryptodev_aes_ctr = {
      NID_aes_128_ctr,
      16, 16, 14,
      EVP_CIPH_CTR_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  const EVP_CIPHER cryptodev_aes_ctr_192 = {
      NID_aes_192_ctr,
      16, 24, 14,
      EVP_CIPH_CTR_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  
  const EVP_CIPHER cryptodev_aes_ctr_256 = {
      NID_aes_256_ctr,
      16, 32, 14,
      EVP_CIPH_CTR_MODE,
      cryptodev_init_key,
      cryptodev_cipher,
      cryptodev_cleanup,
      sizeof(struct dev_crypto_state),
      EVP_CIPHER_set_asn1_iv,
      EVP_CIPHER_get_asn1_iv,
      NULL
  };
  # endif
  /*
   * Registered by the ENGINE when used to find out how to deal with
   * a particular NID in the ENGINE. this says what we'll do at the
   * top level - note, that list is restricted by what we answer with
   */
  static int
  cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
                           const int **nids, int nid)
  {
      if (!cipher)
          return (cryptodev_usable_ciphers(nids));
  
      switch (nid) {
      case NID_rc4:
          *cipher = &cryptodev_rc4;
          break;
      case NID_des_ede3_cbc:
          *cipher = &cryptodev_3des_cbc;
          break;
      case NID_des_cbc:
          *cipher = &cryptodev_des_cbc;
          break;
      case NID_bf_cbc:
          *cipher = &cryptodev_bf_cbc;
          break;
      case NID_cast5_cbc:
          *cipher = &cryptodev_cast_cbc;
          break;
      case NID_aes_128_cbc:
          *cipher = &cryptodev_aes_cbc;
          break;
      case NID_aes_192_cbc:
          *cipher = &cryptodev_aes_192_cbc;
          break;
      case NID_aes_256_cbc:
          *cipher = &cryptodev_aes_256_cbc;
          break;
  # ifdef CRYPTO_AES_CTR
      case NID_aes_128_ctr:
          *cipher = &cryptodev_aes_ctr;
          break;
      case NID_aes_192_ctr:
          *cipher = &cryptodev_aes_ctr_192;
          break;
      case NID_aes_256_ctr:
          *cipher = &cryptodev_aes_ctr_256;
          break;
  # endif
      default:
          *cipher = NULL;
          break;
      }
      return (*cipher != NULL);
  }
  
  # ifdef USE_CRYPTODEV_DIGESTS
  
  /* convert digest type to cryptodev */
  static int digest_nid_to_cryptodev(int nid)
  {
      int i;
  
      for (i = 0; digests[i].id; i++)
          if (digests[i].nid == nid)
              return (digests[i].id);
      return (0);
  }
  
  static int digest_key_length(int nid)
  {
      int i;
  
      for (i = 0; digests[i].id; i++)
          if (digests[i].nid == nid)
              return digests[i].keylen;
      return (0);
  }
  
  static int cryptodev_digest_init(EVP_MD_CTX *ctx)
  {
      struct dev_crypto_state *state = ctx->md_data;
      struct session_op *sess = &state->d_sess;
      int digest;
  
      if ((digest = digest_nid_to_cryptodev(ctx->digest->type)) == NID_undef) {
          printf("cryptodev_digest_init: Can't get digest \n");
          return (0);
      }
  
      memset(state, 0, sizeof(*state));
  
      if ((state->d_fd = get_dev_crypto()) < 0) {
          printf("cryptodev_digest_init: Can't get Dev \n");
          return (0);
      }
  
      sess->mackey = state->dummy_mac_key;
      sess->mackeylen = digest_key_length(ctx->digest->type);
      sess->mac = digest;
  
      if (ioctl(state->d_fd, CIOCGSESSION, sess) < 0) {
          put_dev_crypto(state->d_fd);
          state->d_fd = -1;
          printf("cryptodev_digest_init: Open session failed\n");
          return (0);
      }
  
      return (1);
  }
  
  static int cryptodev_digest_update(EVP_MD_CTX *ctx, const void *data,
                                     size_t count)
  {
      struct crypt_op cryp;
      struct dev_crypto_state *state = ctx->md_data;
      struct session_op *sess = &state->d_sess;
      char *new_mac_data;
  
      if (!data || state->d_fd < 0) {
          printf("cryptodev_digest_update: illegal inputs \n");
          return (0);
      }
  
      if (!count) {
          return (0);
      }
  
      if (!(ctx->flags & EVP_MD_CTX_FLAG_ONESHOT)) {
          /* if application doesn't support one buffer */
          new_mac_data =
              OPENSSL_realloc(state->mac_data, state->mac_len + count);
  
          if (!new_mac_data) {
              printf("cryptodev_digest_update: realloc failed\n");
              return (0);
          }
          state->mac_data = new_mac_data;
  
          memcpy(state->mac_data + state->mac_len, data, count);
          state->mac_len += count;
  
          return (1);
      }
  
      memset(&cryp, 0, sizeof(cryp));
  
      cryp.ses = sess->ses;
      cryp.flags = 0;
      cryp.len = count;
      cryp.src = (caddr_t) data;
      cryp.dst = NULL;
      cryp.mac = (caddr_t) state->digest_res;
      if (ioctl(state->d_fd, CIOCCRYPT, &cryp) < 0) {
          printf("cryptodev_digest_update: digest failed\n");
          return (0);
      }
      return (1);
  }
  
  static int cryptodev_digest_final(EVP_MD_CTX *ctx, unsigned char *md)
  {
      struct crypt_op cryp;
      struct dev_crypto_state *state = ctx->md_data;
      struct session_op *sess = &state->d_sess;
  
      int ret = 1;
  
      if (!md || state->d_fd < 0) {
          printf("cryptodev_digest_final: illegal input\n");
          return (0);
      }
  
      if (!(ctx->flags & EVP_MD_CTX_FLAG_ONESHOT)) {
          /* if application doesn't support one buffer */
          memset(&cryp, 0, sizeof(cryp));
          cryp.ses = sess->ses;
          cryp.flags = 0;
          cryp.len = state->mac_len;
          cryp.src = state->mac_data;
          cryp.dst = NULL;
          cryp.mac = (caddr_t) md;
          if (ioctl(state->d_fd, CIOCCRYPT, &cryp) < 0) {
              printf("cryptodev_digest_final: digest failed\n");
              return (0);
          }
  
          return 1;
      }
  
      memcpy(md, state->digest_res, ctx->digest->md_size);
  
      return (ret);
  }
  
  static int cryptodev_digest_cleanup(EVP_MD_CTX *ctx)
  {
      int ret = 1;
      struct dev_crypto_state *state = ctx->md_data;
      struct session_op *sess = &state->d_sess;
  
      if (state == NULL)
          return 0;
  
      if (state->d_fd < 0) {
          printf("cryptodev_digest_cleanup: illegal input\n");
          return (0);
      }
  
      OPENSSL_free(state->mac_data);
      state->mac_data = NULL;
      state->mac_len = 0;
  
      if (ioctl(state->d_fd, CIOCFSESSION, &sess->ses) < 0) {
          printf("cryptodev_digest_cleanup: failed to close session\n");
          ret = 0;
      } else {
          ret = 1;
      }
      put_dev_crypto(state->d_fd);
      state->d_fd = -1;
  
      return (ret);
  }
  
  static int cryptodev_digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
  {
      struct dev_crypto_state *fstate = from->md_data;
      struct dev_crypto_state *dstate = to->md_data;
      struct session_op *sess;
      int digest;
  
      if (dstate == NULL || fstate == NULL)
          return 1;
  
      memcpy(dstate, fstate, sizeof(struct dev_crypto_state));
  
      sess = &dstate->d_sess;
  
      digest = digest_nid_to_cryptodev(to->digest->type);
  
      sess->mackey = dstate->dummy_mac_key;
      sess->mackeylen = digest_key_length(to->digest->type);
      sess->mac = digest;
  
      dstate->d_fd = get_dev_crypto();
  
      if (ioctl(dstate->d_fd, CIOCGSESSION, sess) < 0) {
          put_dev_crypto(dstate->d_fd);
          dstate->d_fd = -1;
          printf("cryptodev_digest_copy: Open session failed\n");
          return (0);
      }
  
      if (fstate->mac_len != 0) {
          if (fstate->mac_data != NULL) {
              dstate->mac_data = OPENSSL_malloc(fstate->mac_len);
              if (dstate->mac_data == NULL) {
                  printf("cryptodev_digest_copy: mac_data allocation failed\n");
                  return (0);
              }
              memcpy(dstate->mac_data, fstate->mac_data, fstate->mac_len);
              dstate->mac_len = fstate->mac_len;
          }
      }
  
      return 1;
  }
  
  const EVP_MD cryptodev_sha1 = {
      NID_sha1,
      NID_undef,
      SHA_DIGEST_LENGTH,
      EVP_MD_FLAG_ONESHOT,
      cryptodev_digest_init,
      cryptodev_digest_update,
      cryptodev_digest_final,
      cryptodev_digest_copy,
      cryptodev_digest_cleanup,
      EVP_PKEY_NULL_method,
      SHA_CBLOCK,
      sizeof(struct dev_crypto_state),
  };
  
  const EVP_MD cryptodev_md5 = {
      NID_md5,
      NID_undef,
      16 /* MD5_DIGEST_LENGTH */ ,
      EVP_MD_FLAG_ONESHOT,
      cryptodev_digest_init,
      cryptodev_digest_update,
      cryptodev_digest_final,
      cryptodev_digest_copy,
      cryptodev_digest_cleanup,
      EVP_PKEY_NULL_method,
      64 /* MD5_CBLOCK */ ,
      sizeof(struct dev_crypto_state),
  };
  
  # endif                         /* USE_CRYPTODEV_DIGESTS */
  
  static int
  cryptodev_engine_digests(ENGINE *e, const EVP_MD **digest,
                           const int **nids, int nid)
  {
      if (!digest)
          return (cryptodev_usable_digests(nids));
  
      switch (nid) {
  # ifdef USE_CRYPTODEV_DIGESTS
      case NID_md5:
          *digest = &cryptodev_md5;
          break;
      case NID_sha1:
          *digest = &cryptodev_sha1;
          break;
      default:
  # endif                         /* USE_CRYPTODEV_DIGESTS */
          *digest = NULL;
          break;
      }
      return (*digest != NULL);
  }
  
  /*
   * Convert a BIGNUM to the representation that /dev/crypto needs.
   * Upon completion of use, the caller is responsible for freeing
   * crp->crp_p.
   */
  static int bn2crparam(const BIGNUM *a, struct crparam *crp)
  {
      ssize_t bytes, bits;
      u_char *b;
  
      crp->crp_p = NULL;
      crp->crp_nbits = 0;
  
      bits = BN_num_bits(a);
      bytes = BN_num_bytes(a);
  
      b = OPENSSL_zalloc(bytes);
      if (b == NULL)
          return (1);
  
      crp->crp_p = (caddr_t) b;
      crp->crp_nbits = bits;
  
      BN_bn2bin(a, b);
      return (0);
  }
  
  /* Convert a /dev/crypto parameter to a BIGNUM */
  static int crparam2bn(struct crparam *crp, BIGNUM *a)
  {
      u_int8_t *pd;
      int i, bytes;
  
      bytes = (crp->crp_nbits + 7) / 8;
  
      if (bytes == 0)
          return (-1);
  
      if ((pd = OPENSSL_malloc(bytes)) == NULL)
          return (-1);
  
      for (i = 0; i < bytes; i++)
          pd[i] = crp->crp_p[bytes - i - 1];
  
      BN_bin2bn(pd, bytes, a);
      free(pd);
  
      return (0);
  }
  
  static void zapparams(struct crypt_kop *kop)
  {
      int i;
  
      for (i = 0; i < kop->crk_iparams + kop->crk_oparams; i++) {
          if (kop->crk_param[i].crp_p)
              free(kop->crk_param[i].crp_p);
          kop->crk_param[i].crp_p = NULL;
          kop->crk_param[i].crp_nbits = 0;
      }
  }
  
  static int
  cryptodev_asym(struct crypt_kop *kop, int rlen, BIGNUM *r, int slen,
                 BIGNUM *s)
  {
      int fd, ret = -1;
  
      if ((fd = get_asym_dev_crypto()) < 0)
          return (ret);
  
      if (r) {
          kop->crk_param[kop->crk_iparams].crp_p = calloc(rlen, sizeof(char));
          kop->crk_param[kop->crk_iparams].crp_nbits = rlen * 8;
          kop->crk_oparams++;
      }
      if (s) {
          kop->crk_param[kop->crk_iparams + 1].crp_p =
              calloc(slen, sizeof(char));
          kop->crk_param[kop->crk_iparams + 1].crp_nbits = slen * 8;
          kop->crk_oparams++;
      }
  
      if (ioctl(fd, CIOCKEY, kop) == 0) {
          if (r)
              crparam2bn(&kop->crk_param[kop->crk_iparams], r);
          if (s)
              crparam2bn(&kop->crk_param[kop->crk_iparams + 1], s);
          ret = 0;
      }
  
      return (ret);
  }
  
  static int
  cryptodev_bn_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
  {
      struct crypt_kop kop;
      int ret = 1;
  
      /*
       * Currently, we know we can do mod exp iff we can do any asymmetric
       * operations at all.
       */
      if (cryptodev_asymfeat == 0) {
          ret = BN_mod_exp(r, a, p, m, ctx);
          return (ret);
      }
  
      memset(&kop, 0, sizeof(kop));
      kop.crk_op = CRK_MOD_EXP;
  
      /* inputs: a^p % m */
      if (bn2crparam(a, &kop.crk_param[0]))
          goto err;
      if (bn2crparam(p, &kop.crk_param[1]))
          goto err;
      if (bn2crparam(m, &kop.crk_param[2]))
          goto err;
      kop.crk_iparams = 3;
  
      if (cryptodev_asym(&kop, BN_num_bytes(m), r, 0, NULL)) {
          const RSA_METHOD *meth = RSA_PKCS1_OpenSSL();
          printf("OCF asym process failed, Running in software\n");
          ret = meth->bn_mod_exp(r, a, p, m, ctx, in_mont);
  
      } else if (ECANCELED == kop.crk_status) {
          const RSA_METHOD *meth = RSA_PKCS1_OpenSSL();
          printf("OCF hardware operation cancelled. Running in Software\n");
          ret = meth->bn_mod_exp(r, a, p, m, ctx, in_mont);
      }
      /* else cryptodev operation worked ok ==> ret = 1 */
  
   err:
      zapparams(&kop);
      return (ret);
  }
  
  static int
  cryptodev_rsa_nocrt_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
                              BN_CTX *ctx)
  {
      int r;
      ctx = BN_CTX_new();
      r = cryptodev_bn_mod_exp(r0, I, rsa->d, rsa->n, ctx, NULL);
      BN_CTX_free(ctx);
      return (r);
  }
  
  static int
  cryptodev_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
  {
      struct crypt_kop kop;
      int ret = 1;
  
      if (!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp) {
          /* XXX 0 means failure?? */
          return (0);
      }
  
      memset(&kop, 0, sizeof(kop));
      kop.crk_op = CRK_MOD_EXP_CRT;
      /* inputs: rsa->p rsa->q I rsa->dmp1 rsa->dmq1 rsa->iqmp */
      if (bn2crparam(rsa->p, &kop.crk_param[0]))
          goto err;
      if (bn2crparam(rsa->q, &kop.crk_param[1]))
          goto err;
      if (bn2crparam(I, &kop.crk_param[2]))
          goto err;
      if (bn2crparam(rsa->dmp1, &kop.crk_param[3]))
          goto err;
      if (bn2crparam(rsa->dmq1, &kop.crk_param[4]))
          goto err;
      if (bn2crparam(rsa->iqmp, &kop.crk_param[5]))
          goto err;
      kop.crk_iparams = 6;
  
      if (cryptodev_asym(&kop, BN_num_bytes(rsa->n), r0, 0, NULL)) {
          const RSA_METHOD *meth = RSA_PKCS1_OpenSSL();
          printf("OCF asym process failed, running in Software\n");
          ret = (*meth->rsa_mod_exp) (r0, I, rsa, ctx);
  
      } else if (ECANCELED == kop.crk_status) {
          const RSA_METHOD *meth = RSA_PKCS1_OpenSSL();
          printf("OCF hardware operation cancelled. Running in Software\n");
          ret = (*meth->rsa_mod_exp) (r0, I, rsa, ctx);
      }
      /* else cryptodev operation worked ok ==> ret = 1 */
  
   err:
      zapparams(&kop);
      return (ret);
  }
  
  static RSA_METHOD cryptodev_rsa = {
      "cryptodev RSA method",
      NULL,                       /* rsa_pub_enc */
      NULL,                       /* rsa_pub_dec */
      NULL,                       /* rsa_priv_enc */
      NULL,                       /* rsa_priv_dec */
      NULL,
      NULL,
      NULL,                       /* init */
      NULL,                       /* finish */
      0,                          /* flags */
      NULL,                       /* app_data */
      NULL,                       /* rsa_sign */
      NULL                        /* rsa_verify */
  };
  
  static int
  cryptodev_dsa_bn_mod_exp(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
                           const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
  {
      return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx));
  }
  
  static int
  cryptodev_dsa_dsa_mod_exp(DSA *dsa, BIGNUM *t1, BIGNUM *g,
                            BIGNUM *u1, BIGNUM *pub_key, BIGNUM *u2, BIGNUM *p,
                            BN_CTX *ctx, BN_MONT_CTX *mont)
  {
      BIGNUM *t2;
      int ret = 0;
  
      t2 = BN_new();
      if (t2 == NULL)
          goto err;
  
      /* v = ( g^u1 * y^u2 mod p ) mod q */
      /* let t1 = g ^ u1 mod p */
      ret = 0;
  
      if (!dsa->meth->bn_mod_exp(dsa, t1, dsa->g, u1, dsa->p, ctx, mont))
          goto err;
  
      /* let t2 = y ^ u2 mod p */
      if (!dsa->meth->bn_mod_exp(dsa, t2, dsa->pub_key, u2, dsa->p, ctx, mont))
          goto err;
      /* let u1 = t1 * t2 mod p */
      if (!BN_mod_mul(u1, t1, t2, dsa->p, ctx))
          goto err;
  
      BN_copy(t1, u1);
  
      ret = 1;
   err:
      BN_free(t2);
      return (ret);
  }
  
  static DSA_SIG *cryptodev_dsa_do_sign(const unsigned char *dgst, int dlen,
                                        DSA *dsa)
  {
      struct crypt_kop kop;
      BIGNUM *r = NULL, *s = NULL;
      DSA_SIG *dsaret = NULL;
  
      if ((r = BN_new()) == NULL)
          goto err;
      if ((s = BN_new()) == NULL) {
          BN_free(r);
          goto err;
      }
  
      memset(&kop, 0, sizeof(kop));
      kop.crk_op = CRK_DSA_SIGN;
  
      /* inputs: dgst dsa->p dsa->q dsa->g dsa->priv_key */
      kop.crk_param[0].crp_p = (caddr_t) dgst;
      kop.crk_param[0].crp_nbits = dlen * 8;
      if (bn2crparam(dsa->p, &kop.crk_param[1]))
          goto err;
      if (bn2crparam(dsa->q, &kop.crk_param[2]))
          goto err;
      if (bn2crparam(dsa->g, &kop.crk_param[3]))
          goto err;
      if (bn2crparam(dsa->priv_key, &kop.crk_param[4]))
          goto err;
      kop.crk_iparams = 5;
  
      if (cryptodev_asym(&kop, BN_num_bytes(dsa->q), r,
                         BN_num_bytes(dsa->q), s) == 0) {
          dsaret = DSA_SIG_new();
          if (dsaret == NULL)
              goto err;
          dsaret->r = r;
          dsaret->s = s;
      } else {
          const DSA_METHOD *meth = DSA_OpenSSL();
          BN_free(r);
          BN_free(s);
          dsaret = (meth->dsa_do_sign) (dgst, dlen, dsa);
      }
   err:
      kop.crk_param[0].crp_p = NULL;
      zapparams(&kop);
      return (dsaret);
  }
  
  static int
  cryptodev_dsa_verify(const unsigned char *dgst, int dlen,
                       DSA_SIG *sig, DSA *dsa)
  {
      struct crypt_kop kop;
      int dsaret = 1;
  
      memset(&kop, 0, sizeof(kop));
      kop.crk_op = CRK_DSA_VERIFY;
  
      /* inputs: dgst dsa->p dsa->q dsa->g dsa->pub_key sig->r sig->s */
      kop.crk_param[0].crp_p = (caddr_t) dgst;
      kop.crk_param[0].crp_nbits = dlen * 8;
      if (bn2crparam(dsa->p, &kop.crk_param[1]))
          goto err;
      if (bn2crparam(dsa->q, &kop.crk_param[2]))
          goto err;
      if (bn2crparam(dsa->g, &kop.crk_param[3]))
          goto err;
      if (bn2crparam(dsa->pub_key, &kop.crk_param[4]))
          goto err;
      if (bn2crparam(sig->r, &kop.crk_param[5]))
          goto err;
      if (bn2crparam(sig->s, &kop.crk_param[6]))
          goto err;
      kop.crk_iparams = 7;
  
      if (cryptodev_asym(&kop, 0, NULL, 0, NULL) == 0) {
          /*
           * OCF success value is 0, if not zero, change dsaret to fail
           */
          if (0 != kop.crk_status)
              dsaret = 0;
      } else {
          const DSA_METHOD *meth = DSA_OpenSSL();
  
          dsaret = (meth->dsa_do_verify) (dgst, dlen, sig, dsa);
      }
   err:
      kop.crk_param[0].crp_p = NULL;
      zapparams(&kop);
      return (dsaret);
  }
  
  static DSA_METHOD cryptodev_dsa = {
      "cryptodev DSA method",
      NULL,
      NULL,                       /* dsa_sign_setup */
      NULL,
      NULL,                       /* dsa_mod_exp */
      NULL,
      NULL,                       /* init */
      NULL,                       /* finish */
      0,                          /* flags */
      NULL                        /* app_data */
  };
  
  static int
  cryptodev_mod_exp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
                       const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
                       BN_MONT_CTX *m_ctx)
  {
      return (cryptodev_bn_mod_exp(r, a, p, m, ctx, m_ctx));
  }
  
  static int
  cryptodev_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
  {
      struct crypt_kop kop;
      int dhret = 1;
      int fd, keylen;
  
      if ((fd = get_asym_dev_crypto()) < 0) {
          const DH_METHOD *meth = DH_OpenSSL();
  
          return ((meth->compute_key) (key, pub_key, dh));
      }
  
      keylen = BN_num_bits(dh->p);
  
      memset(&kop, 0, sizeof(kop));
      kop.crk_op = CRK_DH_COMPUTE_KEY;
  
      /* inputs: dh->priv_key pub_key dh->p key */
      if (bn2crparam(dh->priv_key, &kop.crk_param[0]))
          goto err;
      if (bn2crparam(pub_key, &kop.crk_param[1]))
          goto err;
      if (bn2crparam(dh->p, &kop.crk_param[2]))
          goto err;
      kop.crk_iparams = 3;
  
      kop.crk_param[3].crp_p = (caddr_t) key;
      kop.crk_param[3].crp_nbits = keylen * 8;
      kop.crk_oparams = 1;
  
      if (ioctl(fd, CIOCKEY, &kop) == -1) {
          const DH_METHOD *meth = DH_OpenSSL();
  
          dhret = (meth->compute_key) (key, pub_key, dh);
      }
   err:
      kop.crk_param[3].crp_p = NULL;
      zapparams(&kop);
      return (dhret);
  }
  
  static DH_METHOD cryptodev_dh = {
      "cryptodev DH method",
      NULL,                       /* cryptodev_dh_generate_key */
      NULL,
      NULL,
      NULL,
      NULL,
      0,                          /* flags */
      NULL                        /* app_data */
  };
  
  /*
   * ctrl right now is just a wrapper that doesn't do much
   * but I expect we'll want some options soon.
   */
  static int
  cryptodev_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
  {
  # ifdef HAVE_SYSLOG_R
      struct syslog_data sd = SYSLOG_DATA_INIT;
  # endif
  
      switch (cmd) {
      default:
  # ifdef HAVE_SYSLOG_R
          syslog_r(LOG_ERR, &sd, "cryptodev_ctrl: unknown command %d", cmd);
  # else
          syslog(LOG_ERR, "cryptodev_ctrl: unknown command %d", cmd);
  # endif
          break;
      }
      return (1);
  }
  
  void ENGINE_load_cryptodev(void)
  {
      ENGINE *engine = ENGINE_new();
      int fd;
  
      if (engine == NULL)
          return;
      if ((fd = get_dev_crypto()) < 0) {
          ENGINE_free(engine);
          return;
      }
  
      /*
       * find out what asymmetric crypto algorithms we support
       */
      if (ioctl(fd, CIOCASYMFEAT, &cryptodev_asymfeat) == -1) {
          put_dev_crypto(fd);
          ENGINE_free(engine);
          return;
      }
      put_dev_crypto(fd);
  
      if (!ENGINE_set_id(engine, "cryptodev") ||
          !ENGINE_set_name(engine, "BSD cryptodev engine") ||
          !ENGINE_set_ciphers(engine, cryptodev_engine_ciphers) ||
          !ENGINE_set_digests(engine, cryptodev_engine_digests) ||
          !ENGINE_set_ctrl_function(engine, cryptodev_ctrl) ||
          !ENGINE_set_cmd_defns(engine, cryptodev_defns)) {
          ENGINE_free(engine);
          return;
      }
  
      if (ENGINE_set_RSA(engine, &cryptodev_rsa)) {
          const RSA_METHOD *rsa_meth = RSA_PKCS1_OpenSSL();
  
          cryptodev_rsa.bn_mod_exp = rsa_meth->bn_mod_exp;
          cryptodev_rsa.rsa_mod_exp = rsa_meth->rsa_mod_exp;
          cryptodev_rsa.rsa_pub_enc = rsa_meth->rsa_pub_enc;
          cryptodev_rsa.rsa_pub_dec = rsa_meth->rsa_pub_dec;
          cryptodev_rsa.rsa_priv_enc = rsa_meth->rsa_priv_enc;
          cryptodev_rsa.rsa_priv_dec = rsa_meth->rsa_priv_dec;
          if (cryptodev_asymfeat & CRF_MOD_EXP) {
              cryptodev_rsa.bn_mod_exp = cryptodev_bn_mod_exp;
              if (cryptodev_asymfeat & CRF_MOD_EXP_CRT)
                  cryptodev_rsa.rsa_mod_exp = cryptodev_rsa_mod_exp;
              else
                  cryptodev_rsa.rsa_mod_exp = cryptodev_rsa_nocrt_mod_exp;
          }
      }
  
      if (ENGINE_set_DSA(engine, &cryptodev_dsa)) {
          const DSA_METHOD *meth = DSA_OpenSSL();
  
          memcpy(&cryptodev_dsa, meth, sizeof(DSA_METHOD));
          if (cryptodev_asymfeat & CRF_DSA_SIGN)
              cryptodev_dsa.dsa_do_sign = cryptodev_dsa_do_sign;
          if (cryptodev_asymfeat & CRF_MOD_EXP) {
              cryptodev_dsa.bn_mod_exp = cryptodev_dsa_bn_mod_exp;
              cryptodev_dsa.dsa_mod_exp = cryptodev_dsa_dsa_mod_exp;
          }
          if (cryptodev_asymfeat & CRF_DSA_VERIFY)
              cryptodev_dsa.dsa_do_verify = cryptodev_dsa_verify;
      }
  
      if (ENGINE_set_DH(engine, &cryptodev_dh)) {
          const DH_METHOD *dh_meth = DH_OpenSSL();
  
          cryptodev_dh.generate_key = dh_meth->generate_key;
          cryptodev_dh.compute_key = dh_meth->compute_key;
          cryptodev_dh.bn_mod_exp = dh_meth->bn_mod_exp;
          if (cryptodev_asymfeat & CRF_MOD_EXP) {
              cryptodev_dh.bn_mod_exp = cryptodev_mod_exp_dh;
              if (cryptodev_asymfeat & CRF_DH_COMPUTE_KEY)
                  cryptodev_dh.compute_key = cryptodev_dh_compute_key;
          }
      }
  
      ENGINE_add(engine);
      ENGINE_free(engine);
      ERR_clear_error();
  }
  
  #endif                          /* HAVE_CRYPTODEV */
  