diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 8ebcb187e9c4c126558d31f5409df5a459878189..d7f09cec6811418d61cdb0d6cad290a0faaf5168 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -2635,6 +2635,9 @@ extern "C" {
     pub fn SSL_SESSION_free(s: *mut SSL_SESSION);
     pub fn SSL_SESSION_get_id(s: *const SSL_SESSION, len: *mut c_uint) -> *const c_uchar;
 
+    pub fn d2i_SSL_SESSION(a: *mut *mut SSL_SESSION, pp: *mut *const c_uchar, len: c_long) -> *mut SSL_SESSION;
+    pub fn i2d_SSL_SESSION(s: *mut SSL_SESSION, pp: *mut *mut c_uchar) -> c_int;
+
     #[cfg(not(ossl101))]
     pub fn SSL_CTX_set_alpn_protos(s: *mut SSL_CTX, data: *const c_uchar, len: c_uint) -> c_int;
 
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 0f9e8935e3fa0d20d9f6efa3258ab17c5915fbdd..ce98b18f7a0417cb13c82640d9dad9a33f259ac2 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -1914,6 +1914,19 @@ impl Clone for SslSession {
     }
 }
 
+impl SslSession {
+    from_der! {
+        /// Deserializes a DER-encoded session structure.
+        ///
+        /// This corresponds to [`d2i_SSL_SESSION`].
+        ///
+        /// [`d2i_SSL_SESSION`]: https://www.openssl.org/docs/man1.0.2/ssl/d2i_SSL_SESSION.html
+        from_der,
+        SslSession,
+        ffi::d2i_SSL_SESSION
+    }
+}
+
 impl ToOwned for SslSessionRef {
     type Owned = SslSession;
 
@@ -1958,6 +1971,16 @@ impl SslSessionRef {
     pub fn master_key(&self, buf: &mut [u8]) -> usize {
         unsafe { compat::SSL_SESSION_get_master_key(self.as_ptr(), buf.as_mut_ptr(), buf.len()) }
     }
+
+    to_der! {
+        /// Serializes the session into a DER-encoded structure.
+        ///
+        /// This corresponds to [`i2d_SSL_SESSION`].
+        ///
+        /// [`i2d_SSL_SESSION`]: https://www.openssl.org/docs/man1.0.2/ssl/i2d_SSL_SESSION.html
+        to_der,
+        ffi::i2d_SSL_SESSION
+    }
 }
 
 foreign_type! {