+# endif
+
+int EVP_KDF_up_ref(EVP_KDF *kdf);
+void EVP_KDF_free(EVP_KDF *kdf);
+EVP_KDF *EVP_KDF_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
+ const char *properties);
+
+EVP_KDF_CTX *EVP_KDF_CTX_new(EVP_KDF *kdf);
+void EVP_KDF_CTX_free(EVP_KDF_CTX *ctx);
+EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src);
+int EVP_KDF_number(const EVP_KDF *kdf);
+int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name);
+const char *EVP_KDF_name(const EVP_KDF *kdf);
+const OSSL_PROVIDER *EVP_KDF_provider(const EVP_KDF *kdf);
+const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx);
+
+void EVP_KDF_CTX_reset(EVP_KDF_CTX *ctx);
+size_t EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX *ctx);
+int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen);
+int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[]);
+int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[]);
+int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[]);
+const OSSL_PARAM *EVP_KDF_gettable_params(const EVP_KDF *kdf);
+const OSSL_PARAM *EVP_KDF_gettable_ctx_params(const EVP_KDF *kdf);
+const OSSL_PARAM *EVP_KDF_settable_ctx_params(const EVP_KDF *kdf);
+
+void EVP_KDF_do_all_provided(OSSL_LIB_CTX *libctx,
+ void (*fn)(EVP_KDF *kdf, void *arg),
+ void *arg);
+void EVP_KDF_names_do_all(const EVP_KDF *kdf,
+ void (*fn)(const char *name, void *data),
+ void *data);
+
+# define EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND 0
+# define EVP_KDF_HKDF_MODE_EXTRACT_ONLY 1
+# define EVP_KDF_HKDF_MODE_EXPAND_ONLY 2
+
+#define EVP_KDF_SSHKDF_TYPE_INITIAL_IV_CLI_TO_SRV 65
+#define EVP_KDF_SSHKDF_TYPE_INITIAL_IV_SRV_TO_CLI 66
+#define EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_CLI_TO_SRV 67
+#define EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_SRV_TO_CLI 68
+#define EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_CLI_TO_SRV 69
+#define EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_SRV_TO_CLI 70
+
+/**** The legacy PKEY-based KDF API follows. ****/