diff --git a/openssl-sys/src/x509.rs b/openssl-sys/src/x509.rs
index d125e4b977ca8876959e30e658c69f2ca4cf626b..fc6e4269b8966b216b28ef90301aef3c90f909f7 100644
--- a/openssl-sys/src/x509.rs
+++ b/openssl-sys/src/x509.rs
@@ -228,6 +228,8 @@ extern "C" {
     pub fn X509_set_serialNumber(x: *mut X509, sn: *mut ASN1_INTEGER) -> c_int;
     pub fn X509_get_serialNumber(x: *mut X509) -> *mut ASN1_INTEGER;
     pub fn X509_set_issuer_name(x: *mut X509, name: *mut X509_NAME) -> c_int;
+
+    pub fn X509_subject_name_hash(x: *mut ::X509) -> c_ulong;
 }
 cfg_if! {
     if #[cfg(any(ossl110, libressl280))] {
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index 39190b7ab04f67254ebe79ffe6b5ca2c4981d9cd..a2d34417d6f655d2fb08eb830598d9fd76adbc46 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -398,6 +398,11 @@ impl X509Ref {
         }
     }
 
+    /// Returns the hash of the certificates subject
+    pub fn subject_name_hash(&self) -> u64 {
+        unsafe { ffi::X509_subject_name_hash(self.as_ptr()) }
+    }
+
     /// Returns this certificate's issuer name.
     ///
     /// This corresponds to [`X509_get_issuer_name`].