1 files changed, 23 insertions, 0 deletions
diff --git a/third_party/rust/nss/src/secport.rs b/third_party/rust/nss/src/secport.rs
new file mode 100644
index 0000000000..fc56257155
--- /dev/null
+++ b/third_party/rust/nss/src/secport.rs
@@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use crate::util::ensure_nss_initialized;
+use std::os::raw::c_void;
+
+pub fn secure_memcmp(a: &[u8], b: &[u8]) -> bool {
+    ensure_nss_initialized();
+    // NSS_SecureMemcmp will compare N elements fron our slices,
+    // so make sure they are the same length first.
+    if a.len() != b.len() {
+        return false;
+    }
+    let result = unsafe {
+        nss_sys::NSS_SecureMemcmp(
+            a.as_ptr() as *const c_void,
+            b.as_ptr() as *const c_void,
+            a.len(),
+        )
+    };
+    result == 0
+}