diff --git a/openssl-sys/src/handwritten/kdf.rs b/openssl-sys/src/handwritten/kdf.rs
index 0f14b63a9..d34f27450 100644
--- a/openssl-sys/src/handwritten/kdf.rs
+++ b/openssl-sys/src/handwritten/kdf.rs
@@ -21,6 +21,14 @@ cfg_if! {
                 info: *const u8,
                 infolen: c_int,
             ) -> c_int;
+            pub fn EVP_KDF_CTX_new(kdf: *mut EVP_KDF) -> *mut EVP_KDF_CTX;
+            pub fn EVP_KDF_CTX_free(ctx: *mut EVP_KDF_CTX);
+            pub fn EVP_KDF_CTX_reset(ctx: *mut EVP_KDF_CTX);
+            pub fn EVP_KDF_CTX_get_kdf_size(ctx: *mut EVP_KDF_CTX) -> size_t;
+            pub fn EVP_KDF_derive(ctx: *mut EVP_KDF_CTX, key: *mut u8, keylen: size_t, params: *const OSSL_PARAM) -> c_int;
+            pub fn EVP_KDF_fetch(ctx: *mut OSSL_LIB_CTX, algorithm: *const c_char, properties: *const c_char) -> *mut EVP_KDF;
+            pub fn EVP_KDF_free(kdf: *mut EVP_KDF);
         }
+
     }
 }
diff --git a/openssl-sys/src/handwritten/params.rs b/openssl-sys/src/handwritten/params.rs
index 3ed00c048..542cef337 100644
--- a/openssl-sys/src/handwritten/params.rs
+++ b/openssl-sys/src/handwritten/params.rs
@@ -6,4 +6,11 @@ extern "C" {
     pub fn OSSL_PARAM_construct_uint(key: *const c_char, buf: *mut c_uint) -> OSSL_PARAM;
     #[cfg(ossl300)]
     pub fn OSSL_PARAM_construct_end() -> OSSL_PARAM;
+    #[cfg(ossl300)]
+    pub fn OSSL_PARAM_construct_octet_string(
+        key: *const c_char,
+        buf: *mut c_void,
+        bsize: size_t,
+    ) -> OSSL_PARAM;
+
 }
diff --git a/openssl-sys/src/handwritten/types.rs b/openssl-sys/src/handwritten/types.rs
index 593e20cdb..d465a4414 100644
--- a/openssl-sys/src/handwritten/types.rs
+++ b/openssl-sys/src/handwritten/types.rs
@@ -1139,3 +1139,8 @@ pub struct OSSL_PARAM {
     data_size: size_t,
     return_size: size_t,
 }
+
+#[cfg(ossl300)]
+pub enum EVP_KDF {}
+#[cfg(ossl300)]
+pub enum EVP_KDF_CTX {}