1 files changed, 18 insertions, 0 deletions
diff --git a/src/asn1_types/strings/numericstring.rs b/src/asn1_types/strings/numericstring.rs
new file mode 100644
index 0000000..dbe4ff1
--- /dev/null
+++ b/src/asn1_types/strings/numericstring.rs
@@ -0,0 +1,18 @@
+use crate::{asn1_string, TestValidCharset};
+use crate::{Error, Result};
+use alloc::string::String;
+
+asn1_string!(NumericString);
+
+impl<'a> TestValidCharset for NumericString<'a> {
+    fn test_valid_charset(i: &[u8]) -> Result<()> {
+        #[allow(clippy::trivially_copy_pass_by_ref)]
+        fn is_numeric(b: &u8) -> bool {
+            matches!(*b, b'0'..=b'9' | b' ')
+        }
+        if !i.iter().all(is_numeric) {
+            return Err(Error::StringInvalidCharset);
+        }
+        Ok(())
+    }
+}