kdf: set_params is deprecated

From discussion on openssl/openssl#14551 it
sounds like set_params is going to be deprecated.

Signed-off-by: Arthur Gautier <[email protected]>

Author: baloo

openssl-sys/src/evp.rs

@@ -226,7 +226,6 @@ cfg_if! {
             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_set_params(ctx: *mut EVP_KDF_CTX, params: *mut OSSL_PARAM)-> c_int;
             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_CTX_kdf(ctx: *mut EVP_KDF_CTX) -> *const EVP_KDF;

openssl/src/kdf.rs

@@ -202,21 +202,14 @@ pub fn derive<P: KDFParams>(kdf: P, output: &mut [u8]) -> Result<(), KDFError> {
 
     let mut ctx = KDFContext::new(kdf_ptr)?;
     let mut params = kdf.to_params()?;
-    unsafe {
-        cvt(ffi::EVP_KDF_CTX_set_params(
-            ctx.as_mut_ptr(),
-            params.as_mut_ptr(),
-        ))?
-    };
 
     // TODO: Check EVP_KDF_CTX_get_kdf_size ?
-
     unsafe {
         cvt(ffi::EVP_KDF_derive(
             ctx.as_mut_ptr(),
             output.as_mut_ptr(),
             output.len(),
-            ptr::null(),
+            params.as_ptr(),
         ))?
     };
     drop(params);

openssl/src/params.rs

@@ -156,6 +156,10 @@ impl Params {
     pub fn as_mut_ptr(&mut self) -> *mut ffi::OSSL_PARAM {
         self.output.as_mut_ptr()
     }
+
+    pub fn as_ptr(&mut self) -> *const ffi::OSSL_PARAM {
+        self.output.as_ptr()
+    }
 }
 
 impl fmt::Debug for Params {