OPENSSL_KEYTYPE_RSA
      (int)
     OPENSSL_KEYTYPE_DSA
     (int)
    OPENSSL_KEYTYPE_DH
     (int)
    OPENSSL_KEYTYPE_EC
      (int)
     OPENSSL_KEYTYPE_X25519
      (int)
     OPENSSL_KEYTYPE_ED25519
      (int)
     OPENSSL_KEYTYPE_X448
      (int)
     OPENSSL_KEYTYPE_ED448
      (int)
     