From 288b189de0447767d89caeece45a7c73a6413aca Mon Sep 17 00:00:00 2001
From: fengyingcai <fengyc.work@gmail.com>
Date: Fri, 22 Nov 2019 16:33:15 +0800
Subject: [PATCH] Add EVP_md_null() and MessageDigest::md_null()

---
 openssl-sys/src/evp.rs | 1 +
 openssl/src/hash.rs    | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/openssl-sys/src/evp.rs b/openssl-sys/src/evp.rs
index 8a057a0d..9b41d6de 100644
--- a/openssl-sys/src/evp.rs
+++ b/openssl-sys/src/evp.rs
@@ -211,6 +211,7 @@ extern "C" {
         ptr: *mut c_void,
     ) -> c_int;
 
+    pub fn EVP_md_null() -> *const EVP_MD;
     pub fn EVP_md5() -> *const EVP_MD;
     pub fn EVP_sha1() -> *const EVP_MD;
     pub fn EVP_sha224() -> *const EVP_MD;
diff --git a/openssl/src/hash.rs b/openssl/src/hash.rs
index 5025de19..d067d100 100644
--- a/openssl/src/hash.rs
+++ b/openssl/src/hash.rs
@@ -40,6 +40,10 @@ impl MessageDigest {
         }
     }
 
+    pub fn md_null() -> MessageDigest {
+        unsafe { MessageDigest(ffi::EVP_md_null()) }
+    }
+
     pub fn md5() -> MessageDigest {
         unsafe { MessageDigest(ffi::EVP_md5()) }
     }