diff --git a/src/bls_api.rs b/src/bls_api.rs
index c8c00bc..f251349 100644
--- a/src/bls_api.rs
+++ b/src/bls_api.rs
@@ -7,6 +7,7 @@ unsafe extern "C" {
     pub unsafe fn blsInit(curve: usize, compiledTimeVar: usize) -> i32;
 
     pub unsafe fn mclBnFr_isZero(secret_key: *const SecretKey) -> i32;
+    pub unsafe fn mclBnFr_isValid(secret_key: *const SecretKey) -> i32;
     pub unsafe fn mclBn_getFrByteSize() -> usize;
     pub unsafe fn mclBn_getFpByteSize() -> usize;
     pub unsafe fn mclBnG2_setStr(x: *mut G2, buf: *const u8, buf_size: usize, io_mode: i32) -> i32;
diff --git a/src/secret_key.rs b/src/secret_key.rs
index b1ee341..233491f 100644
--- a/src/secret_key.rs
+++ b/src/secret_key.rs
@@ -100,4 +100,14 @@ impl SecretKey {
 
         Ok(buf)
     }
+
+    pub fn is_zero(&self) -> bool {
+        INIT.call_once(init_library);
+        unsafe { mclBnFr_isZero(self) == 1 }
+    }
+
+    pub fn is_valid(&self) -> bool {
+        INIT.call_once(init_library);
+        unsafe { mclBnFr_isValid(self) == 1 }
+    }
 }