DES Encrypt/Decrypt - checks length of IV string

Checks the length of IV string when encrypting.  DES encrypt/decrypt test swas updated to use utf8 instead of HEX.

tests/node/tests/operations.mjs

@@ -400,7 +400,7 @@ color: white;
             },
             iv: {
                 string: "threetwo",
-                option: "Hex",
+                option: "utf8",
             },
             mode: "ECB",
         });
@@ -415,7 +415,7 @@ color: white;
             },
             iv: {
                 string: "threetwo",
-                option: "Hex",
+                option: "utf8",
             },
             mode: "ECB",
         });