1 files changed, 19 insertions, 0 deletions
diff --git a/rust/vendor/x509-parser/src/utils.rs b/rust/vendor/x509-parser/src/utils.rs
new file mode 100644
index 0000000..72b4d99
--- /dev/null
+++ b/rust/vendor/x509-parser/src/utils.rs
@@ -0,0 +1,19 @@
+/// Formats a slice to a colon-separated hex string (for ex `01:02:ff:ff`)
+pub fn format_serial(i: &[u8]) -> String {
+    let mut s = i.iter().fold(String::with_capacity(3 * i.len()), |a, b| {
+        a + &format!("{:02x}:", b)
+    });
+    s.pop();
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_format_serial() {
+        let b: &[u8] = &[1, 2, 3, 4, 0xff];
+        assert_eq!("01:02:03:04:ff", format_serial(b));
+    }
+}