text: /*
   * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (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
   */
  
  /*
   * low level APIs are deprecated for public use, but still ok for
   * internal use.
   */
  #include "internal/deprecated.h"
  
  #include <openssl/core_dispatch.h>
  #include <openssl/core_names.h>
  #include <openssl/core_object.h>
  #include <openssl/crypto.h>
  #include <openssl/err.h>
  #include <openssl/params.h>
  #include <openssl/pem.h>         /* PEM_BUFSIZE and public PEM functions */
  #include <openssl/pkcs12.h>
  #include <openssl/x509.h>
  #include <openssl/proverr.h>
  #include "internal/cryptlib.h"   /* ossl_assert() */
  #include "internal/asn1.h"
  #include "crypto/dh.h"
  #include "crypto/dsa.h"
  #include "crypto/ec.h"
  #include "crypto/evp.h"
  #include "crypto/ecx.h"
  #include "crypto/rsa.h"
  #include "crypto/x509.h"
  #include "prov/bio.h"
  #include "prov/implementations.h"
  #include "endecoder_local.h"
  
  struct der2key_ctx_st;           /* Forward declaration */
  typedef int check_key_fn(void *, struct der2key_ctx_st *ctx);
  typedef void adjust_key_fn(void *, struct der2key_ctx_st *ctx);
  typedef void free_key_fn(void *);
  typedef void *d2i_PKCS8_fn(void **, const unsigned char **, long,
                             struct der2key_ctx_st *);
  struct keytype_desc_st {
      const char *keytype_name;
      const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */
  
      /* The input structure name */
      const char *structure_name;
  
      /*
       * The EVP_PKEY_xxx type macro.  Should be zero for type specific
       * structures, non-zero when the outermost structure is PKCS#8 or
       * SubjectPublicKeyInfo.  This determines which of the function
       * pointers below will be used.
       */
      int evp_type;
  
      /* The selection mask for OSSL_FUNC_decoder_does_selection() */
      int selection_mask;
  
      /* For type specific decoders, we use the corresponding d2i */
      d2i_of_void *d2i_private_key; /* From type-specific DER */
      d2i_of_void *d2i_public_key;  /* From type-specific DER */
      d2i_of_void *d2i_key_params;  /* From type-specific DER */
      d2i_PKCS8_fn *d2i_PKCS8;      /* Wrapped in a PrivateKeyInfo */
      d2i_of_void *d2i_PUBKEY;      /* Wrapped in a SubjectPublicKeyInfo */
  
      /*
       * For any key, we may need to check that the key meets expectations.
       * This is useful when the same functions can decode several variants
       * of a key.
       */
      check_key_fn *check_key;
  
      /*
       * For any key, we may need to make provider specific adjustments, such
       * as ensure the key carries the correct library context.
       */
      adjust_key_fn *adjust_key;
      /* {type}_free() */
      free_key_fn *free_key;
  };
  
  /*
   * Context used for DER to key decoding.
   */
  struct der2key_ctx_st {
      PROV_CTX *provctx;
      const struct keytype_desc_st *desc;
      /* The selection that is passed to der2key_decode() */
      int selection;
      /* Flag used to signal that a failure is fatal */
      unsigned int flag_fatal : 1;
  };
  
  typedef void *key_from_pkcs8_t(const PKCS8_PRIV_KEY_INFO *p8inf,
                                 OSSL_LIB_CTX *libctx, const char *propq);
  static void *der2key_decode_p8(const unsigned char **input_der,
                                 long input_der_len, struct der2key_ctx_st *ctx,
                                 key_from_pkcs8_t *key_from_pkcs8)
  {
      PKCS8_PRIV_KEY_INFO *p8inf = NULL;
      const X509_ALGOR *alg = NULL;
      void *key = NULL;
  
      if ((p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, input_der, input_der_len)) != NULL
          && PKCS8_pkey_get0(NULL, NULL, NULL, &alg, p8inf)
          && OBJ_obj2nid(alg->algorithm) == ctx->desc->evp_type)
          key = key_from_pkcs8(p8inf, PROV_LIBCTX_OF(ctx->provctx), NULL);
      PKCS8_PRIV_KEY_INFO_free(p8inf);
  
      return key;
  }
  
  /* ---------------------------------------------------------------------- */
  
  static OSSL_FUNC_decoder_freectx_fn der2key_freectx;
  static OSSL_FUNC_decoder_decode_fn der2key_decode;
  static OSSL_FUNC_decoder_export_object_fn der2key_export_object;
  
  static struct der2key_ctx_st *
  der2key_newctx(void *provctx, const struct keytype_desc_st *desc)
  {
      struct der2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
  
      if (ctx != NULL) {
          ctx->provctx = provctx;
          ctx->desc = desc;
      }
      return ctx;
  }
  
  static void der2key_freectx(void *vctx)
  {
      struct der2key_ctx_st *ctx = vctx;
  
      OPENSSL_free(ctx);
  }
  
  static int der2key_check_selection(int selection,
                                     const struct keytype_desc_st *desc)
  {
      /*
       * The selections are kinda sorta "levels", i.e. each selection given
       * here is assumed to include those following.
       */
      int checks[] = {
          OSSL_KEYMGMT_SELECT_PRIVATE_KEY,
          OSSL_KEYMGMT_SELECT_PUBLIC_KEY,
          OSSL_KEYMGMT_SELECT_ALL_PARAMETERS
      };
      size_t i;
  
      /* The decoder implementations made here support guessing */
      if (selection == 0)
          return 1;
  
      for (i = 0; i < OSSL_NELEM(checks); i++) {
          int check1 = (selection & checks[i]) != 0;
          int check2 = (desc->selection_mask & checks[i]) != 0;
  
          /*
           * If the caller asked for the currently checked bit(s), return
           * whether the decoder description says it's supported.
           */
          if (check1)
              return check2;
      }
  
      /* This should be dead code, but just to be safe... */
      return 0;
  }
  
  static int der2key_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
                            OSSL_CALLBACK *data_cb, void *data_cbarg,
                            OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
  {
      struct der2key_ctx_st *ctx = vctx;
      unsigned char *der = NULL;
      const unsigned char *derp;
      long der_len = 0;
      void *key = NULL;
      int ok = 0;
  
      ctx->selection = selection;
      /*
       * The caller is allowed to specify 0 as a selection mark, to have the
       * structure and key type guessed.  For type-specific structures, this
       * is not recommended, as some structures are very similar.
       * Note that 0 isn't the same as OSSL_KEYMGMT_SELECT_ALL, as the latter
       * signifies a private key structure, where everything else is assumed
       * to be present as well.
       */
      if (selection == 0)
          selection = ctx->desc->selection_mask;
      if ((selection & ctx->desc->selection_mask) == 0) {
          ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
          return 0;
      }
  
      ok = ossl_read_der(ctx->provctx, cin, &der, &der_len);
      if (!ok)
          goto next;
  
      ok = 0;                      /* Assume that we fail */
  
      if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
          derp = der;
          if (ctx->desc->d2i_PKCS8 != NULL) {
              key = ctx->desc->d2i_PKCS8(NULL, &derp, der_len, ctx);
              if (ctx->flag_fatal)
                  goto end;
          } else if (ctx->desc->d2i_private_key != NULL) {
              key = ctx->desc->d2i_private_key(NULL, &derp, der_len);
          }
          if (key == NULL && ctx->selection != 0)
              goto next;
      }
      if (key == NULL && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
          derp = der;
          if (ctx->desc->d2i_PUBKEY != NULL)
              key = ctx->desc->d2i_PUBKEY(NULL, &derp, der_len);
          else
              key = ctx->desc->d2i_public_key(NULL, &derp, der_len);
          if (key == NULL && ctx->selection != 0)
              goto next;
      }
      if (key == NULL && (selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0) {
          derp = der;
          if (ctx->desc->d2i_key_params != NULL)
              key = ctx->desc->d2i_key_params(NULL, &derp, der_len);
          if (key == NULL && ctx->selection != 0)
              goto next;
      }
  
      /*
       * Last minute check to see if this was the correct type of key.  This
       * should never lead to a fatal error, i.e. the decoding itself was
       * correct, it was just an unexpected key type.  This is generally for
       * classes of key types that have subtle variants, like RSA-PSS keys as
       * opposed to plain RSA keys.
       */
      if (key != NULL
          && ctx->desc->check_key != NULL
          && !ctx->desc->check_key(key, ctx)) {
          ctx->desc->free_key(key);
          key = NULL;
      }
  
      if (key != NULL && ctx->desc->adjust_key != NULL)
          ctx->desc->adjust_key(key, ctx);
  
   next:
      /*
       * Indicated that we successfully decoded something, or not at all.
       * Ending up "empty handed" is not an error.
       */
      ok = 1;
  
      /*
       * We free memory here so it's not held up during the callback, because
       * we know the process is recursive and the allocated chunks of memory
       * add up.
       */
      OPENSSL_free(der);
      der = NULL;
  
      if (key != NULL) {
          OSSL_PARAM params[4];
          int object_type = OSSL_OBJECT_PKEY;
  
          params[0] =
              OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
          params[1] =
              OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
                                               (char *)ctx->desc->keytype_name,
                                               0);
          /* The address of the key becomes the octet string */
          params[2] =
              OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
                                                &key, sizeof(key));
          params[3] = OSSL_PARAM_construct_end();
  
          ok = data_cb(params, data_cbarg);
      }
  
   end:
      ctx->desc->free_key(key);
      OPENSSL_free(der);
  
      return ok;
  }
  
  static int der2key_export_object(void *vctx,
                                   const void *reference, size_t reference_sz,
                                   OSSL_CALLBACK *export_cb, void *export_cbarg)
  {
      struct der2key_ctx_st *ctx = vctx;
      OSSL_FUNC_keymgmt_export_fn *export =
          ossl_prov_get_keymgmt_export(ctx->desc->fns);
      void *keydata;
  
      if (reference_sz == sizeof(keydata) && export != NULL) {
          /* The contents of the reference is the address to our object */
          keydata = *(void **)reference;
  
          return export(keydata, ctx->selection, export_cb, export_cbarg);
      }
      return 0;
  }
  
  /* ---------------------------------------------------------------------- */
  
  #ifndef OPENSSL_NO_DH
  # define dh_evp_type                    EVP_PKEY_DH
  # define dh_d2i_private_key             NULL
  # define dh_d2i_public_key              NULL
  # define dh_d2i_key_params              (d2i_of_void *)d2i_DHparams
  
  static void *dh_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                            struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_dh_key_from_pkcs8);
  }
  
  # define dh_d2i_PUBKEY                  (d2i_of_void *)ossl_d2i_DH_PUBKEY
  # define dh_free                        (free_key_fn *)DH_free
  # define dh_check                       NULL
  
  static void dh_adjust(void *key, struct der2key_ctx_st *ctx)
  {
      ossl_dh_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
  }
  
  # define dhx_evp_type                   EVP_PKEY_DHX
  # define dhx_d2i_private_key            NULL
  # define dhx_d2i_public_key             NULL
  # define dhx_d2i_key_params             (d2i_of_void *)d2i_DHxparams
  # define dhx_d2i_PKCS8                  dh_d2i_PKCS8
  # define dhx_d2i_PUBKEY                 (d2i_of_void *)ossl_d2i_DHx_PUBKEY
  # define dhx_free                       (free_key_fn *)DH_free
  # define dhx_check                      NULL
  # define dhx_adjust                     dh_adjust
  #endif
  
  /* ---------------------------------------------------------------------- */
  
  #ifndef OPENSSL_NO_DSA
  # define dsa_evp_type                   EVP_PKEY_DSA
  # define dsa_d2i_private_key            (d2i_of_void *)d2i_DSAPrivateKey
  # define dsa_d2i_public_key             (d2i_of_void *)d2i_DSAPublicKey
  # define dsa_d2i_key_params             (d2i_of_void *)d2i_DSAparams
  
  static void *dsa_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                             struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_dsa_key_from_pkcs8);
  }
  
  # define dsa_d2i_PUBKEY                 (d2i_of_void *)d2i_DSA_PUBKEY
  # define dsa_free                       (free_key_fn *)DSA_free
  # define dsa_check                      NULL
  
  static void dsa_adjust(void *key, struct der2key_ctx_st *ctx)
  {
      ossl_dsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
  }
  #endif
  
  /* ---------------------------------------------------------------------- */
  
  #ifndef OPENSSL_NO_EC
  # define ec_evp_type                    EVP_PKEY_EC
  # define ec_d2i_private_key             (d2i_of_void *)d2i_ECPrivateKey
  # define ec_d2i_public_key              NULL
  # define ec_d2i_key_params              (d2i_of_void *)d2i_ECParameters
  
  static void *ec_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                            struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_ec_key_from_pkcs8);
  }
  
  # define ec_d2i_PUBKEY                  (d2i_of_void *)d2i_EC_PUBKEY
  # define ec_free                        (free_key_fn *)EC_KEY_free
  
  static int ec_check(void *key, struct der2key_ctx_st *ctx)
  {
      /* We're trying to be clever by comparing two truths */
  
      int sm2 = (EC_KEY_get_flags(key) & EC_FLAG_SM2_RANGE) != 0;
  
      return sm2 == (ctx->desc->evp_type == EVP_PKEY_SM2);
  }
  
  static void ec_adjust(void *key, struct der2key_ctx_st *ctx)
  {
      ossl_ec_key_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
  }
  
  /*
   * ED25519, ED448, X25519, X448 only implement PKCS#8 and SubjectPublicKeyInfo,
   * so no d2i functions to be had.
   */
  
  static void *ecx_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                             struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_ecx_key_from_pkcs8);
  }
  
  static void ecx_key_adjust(void *key, struct der2key_ctx_st *ctx)
  {
      ossl_ecx_key_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
  }
  
  # define ed25519_evp_type               EVP_PKEY_ED25519
  # define ed25519_d2i_private_key        NULL
  # define ed25519_d2i_public_key         NULL
  # define ed25519_d2i_key_params         NULL
  # define ed25519_d2i_PKCS8              ecx_d2i_PKCS8
  # define ed25519_d2i_PUBKEY             (d2i_of_void *)ossl_d2i_ED25519_PUBKEY
  # define ed25519_free                   (free_key_fn *)ossl_ecx_key_free
  # define ed25519_check                  NULL
  # define ed25519_adjust                 ecx_key_adjust
  
  # define ed448_evp_type                 EVP_PKEY_ED448
  # define ed448_d2i_private_key          NULL
  # define ed448_d2i_public_key           NULL
  # define ed448_d2i_key_params           NULL
  # define ed448_d2i_PKCS8                ecx_d2i_PKCS8
  # define ed448_d2i_PUBKEY               (d2i_of_void *)ossl_d2i_ED448_PUBKEY
  # define ed448_free                     (free_key_fn *)ossl_ecx_key_free
  # define ed448_check                    NULL
  # define ed448_adjust                   ecx_key_adjust
  
  # define x25519_evp_type                EVP_PKEY_X25519
  # define x25519_d2i_private_key         NULL
  # define x25519_d2i_public_key          NULL
  # define x25519_d2i_key_params          NULL
  # define x25519_d2i_PKCS8               ecx_d2i_PKCS8
  # define x25519_d2i_PUBKEY              (d2i_of_void *)ossl_d2i_X25519_PUBKEY
  # define x25519_free                    (free_key_fn *)ossl_ecx_key_free
  # define x25519_check                   NULL
  # define x25519_adjust                  ecx_key_adjust
  
  # define x448_evp_type                  EVP_PKEY_X448
  # define x448_d2i_private_key           NULL
  # define x448_d2i_public_key            NULL
  # define x448_d2i_key_params            NULL
  # define x448_d2i_PKCS8                 ecx_d2i_PKCS8
  # define x448_d2i_PUBKEY                (d2i_of_void *)ossl_d2i_X448_PUBKEY
  # define x448_free                      (free_key_fn *)ossl_ecx_key_free
  # define x448_check                     NULL
  # define x448_adjust                    ecx_key_adjust
  
  # ifndef OPENSSL_NO_SM2
  #  define sm2_evp_type                  EVP_PKEY_SM2
  #  define sm2_d2i_private_key           (d2i_of_void *)d2i_ECPrivateKey
  #  define sm2_d2i_public_key            NULL
  #  define sm2_d2i_key_params            (d2i_of_void *)d2i_ECParameters
  
  static void *sm2_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                             struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_ec_key_from_pkcs8);
  }
  
  #  define sm2_d2i_PUBKEY                (d2i_of_void *)d2i_EC_PUBKEY
  #  define sm2_free                      (free_key_fn *)EC_KEY_free
  #  define sm2_check                     ec_check
  #  define sm2_adjust                    ec_adjust
  # endif
  #endif
  
  /* ---------------------------------------------------------------------- */
  
  #define rsa_evp_type                    EVP_PKEY_RSA
  #define rsa_d2i_private_key             (d2i_of_void *)d2i_RSAPrivateKey
  #define rsa_d2i_public_key              (d2i_of_void *)d2i_RSAPublicKey
  #define rsa_d2i_key_params              NULL
  
  static void *rsa_d2i_PKCS8(void **key, const unsigned char **der, long der_len,
                             struct der2key_ctx_st *ctx)
  {
      return der2key_decode_p8(der, der_len, ctx,
                               (key_from_pkcs8_t *)ossl_rsa_key_from_pkcs8);
  }
  
  #define rsa_d2i_PUBKEY                  (d2i_of_void *)d2i_RSA_PUBKEY
  #define rsa_free                        (free_key_fn *)RSA_free
  
  static int rsa_check(void *key, struct der2key_ctx_st *ctx)
  {
      switch (RSA_test_flags(key, RSA_FLAG_TYPE_MASK)) {
      case RSA_FLAG_TYPE_RSA:
          return ctx->desc->evp_type == EVP_PKEY_RSA;
      case RSA_FLAG_TYPE_RSASSAPSS:
          return ctx->desc->evp_type == EVP_PKEY_RSA_PSS;
      }
  
      /* Currently unsupported RSA key type */
      return 0;
  }
  
  static void rsa_adjust(void *key, struct der2key_ctx_st *ctx)
  {
      ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
  }
  
  #define rsapss_evp_type                 EVP_PKEY_RSA_PSS
  #define rsapss_d2i_private_key          (d2i_of_void *)d2i_RSAPrivateKey
  #define rsapss_d2i_public_key           (d2i_of_void *)d2i_RSAPublicKey
  #define rsapss_d2i_key_params           NULL
  #define rsapss_d2i_PKCS8                rsa_d2i_PKCS8
  #define rsapss_d2i_PUBKEY               (d2i_of_void *)d2i_RSA_PUBKEY
  #define rsapss_free                     (free_key_fn *)RSA_free
  #define rsapss_check                    rsa_check
  #define rsapss_adjust                   rsa_adjust
  
  /* ---------------------------------------------------------------------- */
  
  /*
   * The DO_ macros help define the selection mask and the method functions
   * for each kind of object we want to decode.
   */
  #define DO_type_specific_keypair(keytype)               \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_KEYPAIR ),                \
          keytype##_d2i_private_key,                      \
          keytype##_d2i_public_key,                       \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_type_specific_pub(keytype)                   \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_PUBLIC_KEY ),             \
          NULL,                                           \
          keytype##_d2i_public_key,                       \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_type_specific_priv(keytype)                  \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_PRIVATE_KEY ),            \
          keytype##_d2i_private_key,                      \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_type_specific_params(keytype)                \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_ALL_PARAMETERS ),         \
          NULL,                                           \
          NULL,                                           \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_type_specific(keytype)                       \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_ALL ),                    \
          keytype##_d2i_private_key,                      \
          keytype##_d2i_public_key,                       \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_type_specific_no_pub(keytype)                \
      "type-specific", keytype##_evp_type,                \
          ( OSSL_KEYMGMT_SELECT_PRIVATE_KEY               \
            | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS ),       \
          keytype##_d2i_private_key,                      \
          NULL,                                           \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_PrivateKeyInfo(keytype)                      \
      "PrivateKeyInfo", keytype##_evp_type,               \
          ( OSSL_KEYMGMT_SELECT_PRIVATE_KEY ),            \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_d2i_PKCS8,                            \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_SubjectPublicKeyInfo(keytype)                \
      "SubjectPublicKeyInfo", keytype##_evp_type,         \
          ( OSSL_KEYMGMT_SELECT_PUBLIC_KEY ),             \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_d2i_PUBKEY,                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_DH(keytype)                                  \
      "DH", keytype##_evp_type,                           \
          ( OSSL_KEYMGMT_SELECT_ALL_PARAMETERS ),         \
          NULL,                                           \
          NULL,                                           \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_DHX(keytype)                                 \
      "DHX", keytype##_evp_type,                          \
          ( OSSL_KEYMGMT_SELECT_ALL_PARAMETERS ),         \
          NULL,                                           \
          NULL,                                           \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_DSA(keytype)                                 \
      "DSA", keytype##_evp_type,                          \
          ( OSSL_KEYMGMT_SELECT_ALL ),                    \
          keytype##_d2i_private_key,                      \
          keytype##_d2i_public_key,                       \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_EC(keytype)                                  \
      "EC", keytype##_evp_type,                           \
          ( OSSL_KEYMGMT_SELECT_PRIVATE_KEY               \
            | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS ),       \
          keytype##_d2i_private_key,                      \
          NULL,                                           \
          keytype##_d2i_key_params,                       \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  #define DO_RSA(keytype)                                 \
      "RSA", keytype##_evp_type,                          \
          ( OSSL_KEYMGMT_SELECT_KEYPAIR ),                \
          keytype##_d2i_private_key,                      \
          keytype##_d2i_public_key,                       \
          NULL,                                           \
          NULL,                                           \
          NULL,                                           \
          keytype##_check,                                \
          keytype##_adjust,                               \
          keytype##_free
  
  /*
   * MAKE_DECODER is the single driver for creating OSSL_DISPATCH tables.
   * It takes the following arguments:
   *
   * keytype_name The implementation key type as a string.
   * keytype      The implementation key type.  This must correspond exactly
   *              to our existing keymgmt keytype names...  in other words,
   *              there must exist an ossl_##keytype##_keymgmt_functions.
   * type         The type name for the set of functions that implement the
   *              decoder for the key type.  This isn't necessarily the same
   *              as keytype.  For example, the key types ed25519, ed448,
   *              x25519 and x448 are all handled by the same functions with
   *              the common type name ecx.
   * kind         The kind of support to implement.  This translates into
   *              the DO_##kind macros above, to populate the keytype_desc_st
   *              structure.
   */
  #define MAKE_DECODER(keytype_name, keytype, type, kind)                 \
      static const struct keytype_desc_st kind##_##keytype##_desc =       \
          { keytype_name, ossl_##keytype##_keymgmt_functions,             \
            DO_##kind(keytype) };                                         \
                                                                          \
      static OSSL_FUNC_decoder_newctx_fn kind##_der2##keytype##_newctx;   \
                                                                          \
      static void *kind##_der2##keytype##_newctx(void *provctx)           \
      {                                                                   \
          return der2key_newctx(provctx, &kind##_##keytype##_desc);       \
      }                                                                   \
      static int kind##_der2##keytype##_does_selection(void *provctx,     \
                                                       int selection)     \
      {                                                                   \
          return der2key_check_selection(selection,                       \
                                         &kind##_##keytype##_desc);       \
      }                                                                   \
      const OSSL_DISPATCH                                                 \
      ossl_##kind##_der_to_##keytype##_decoder_functions[] = {            \
          { OSSL_FUNC_DECODER_NEWCTX,                                     \
            (void (*)(void))kind##_der2##keytype##_newctx },              \
          { OSSL_FUNC_DECODER_FREECTX,                                    \
            (void (*)(void))der2key_freectx },                            \
          { OSSL_FUNC_DECODER_DOES_SELECTION,                             \
            (void (*)(void))kind##_der2##keytype##_does_selection },      \
          { OSSL_FUNC_DECODER_DECODE,                                     \
            (void (*)(void))der2key_decode },                             \
          { OSSL_FUNC_DECODER_EXPORT_OBJECT,                              \
            (void (*)(void))der2key_export_object },                      \
          { 0, NULL }                                                     \
      }
  
  #ifndef OPENSSL_NO_DH
  MAKE_DECODER("DH", dh, dh, PrivateKeyInfo);
  MAKE_DECODER("DH", dh, dh, SubjectPublicKeyInfo);
  MAKE_DECODER("DH", dh, dh, type_specific_params);
  MAKE_DECODER("DH", dh, dh, DH);
  MAKE_DECODER("DHX", dhx, dhx, PrivateKeyInfo);
  MAKE_DECODER("DHX", dhx, dhx, SubjectPublicKeyInfo);
  MAKE_DECODER("DHX", dhx, dhx, type_specific_params);
  MAKE_DECODER("DHX", dhx, dhx, DHX);
  #endif
  #ifndef OPENSSL_NO_DSA
  MAKE_DECODER("DSA", dsa, dsa, PrivateKeyInfo);
  MAKE_DECODER("DSA", dsa, dsa, SubjectPublicKeyInfo);
  MAKE_DECODER("DSA", dsa, dsa, type_specific);
  MAKE_DECODER("DSA", dsa, dsa, DSA);
  #endif
  #ifndef OPENSSL_NO_EC
  MAKE_DECODER("EC", ec, ec, PrivateKeyInfo);
  MAKE_DECODER("EC", ec, ec, SubjectPublicKeyInfo);
  MAKE_DECODER("EC", ec, ec, type_specific_no_pub);
  MAKE_DECODER("EC", ec, ec, EC);
  MAKE_DECODER("X25519", x25519, ecx, PrivateKeyInfo);
  MAKE_DECODER("X25519", x25519, ecx, SubjectPublicKeyInfo);
  MAKE_DECODER("X448", x448, ecx, PrivateKeyInfo);
  MAKE_DECODER("X448", x448, ecx, SubjectPublicKeyInfo);
  MAKE_DECODER("ED25519", ed25519, ecx, PrivateKeyInfo);
  MAKE_DECODER("ED25519", ed25519, ecx, SubjectPublicKeyInfo);
  MAKE_DECODER("ED448", ed448, ecx, PrivateKeyInfo);
  MAKE_DECODER("ED448", ed448, ecx, SubjectPublicKeyInfo);
  # ifndef OPENSSL_NO_SM2
  MAKE_DECODER("SM2", sm2, ec, PrivateKeyInfo);
  MAKE_DECODER("SM2", sm2, ec, SubjectPublicKeyInfo);
  # endif
  #endif
  MAKE_DECODER("RSA", rsa, rsa, PrivateKeyInfo);
  MAKE_DECODER("RSA", rsa, rsa, SubjectPublicKeyInfo);
  MAKE_DECODER("RSA", rsa, rsa, type_specific_keypair);
  MAKE_DECODER("RSA", rsa, rsa, RSA);
  MAKE_DECODER("RSA-PSS", rsapss, rsapss, PrivateKeyInfo);
  MAKE_DECODER("RSA-PSS", rsapss, rsapss, SubjectPublicKeyInfo);
  