diff --git a/src/core/operations/ParseASN1HexString.mjs b/src/core/operations/ParseASN1HexString.mjs
index a19ca70c..5e1753a4 100644
--- a/src/core/operations/ParseASN1HexString.mjs
+++ b/src/core/operations/ParseASN1HexString.mjs
@@ -45,7 +45,7 @@ class ParseASN1HexString extends Operation {
      */
     run(input, args) {
         const [index, truncateLen] = args;
-        return r.ASN1HEX.dump(input.replace(/\s/g, ""), {
+        return r.ASN1HEX.dump(input.replace(/\s/g, "").toLowerCase(), {
             "ommitLongOctet": truncateLen
         }, index);
     }
diff --git a/src/core/operations/ParseX509Certificate.mjs b/src/core/operations/ParseX509Certificate.mjs
index aeb5f677..28c9569f 100644
--- a/src/core/operations/ParseX509Certificate.mjs
+++ b/src/core/operations/ParseX509Certificate.mjs
@@ -59,7 +59,7 @@ class ParseX509Certificate extends Operation {
 
         switch (inputFormat) {
             case "DER Hex":
-                input = input.replace(/\s/g, "");
+                input = input.replace(/\s/g, "").toLowerCase();
                 cert.readCertHex(input);
                 break;
             case "PEM":