diff --git a/scripts/mbedtls_dev/ecp.py b/scripts/mbedtls_dev/ecp.py
index da0ae37..4f529d1 100644
--- a/scripts/mbedtls_dev/ecp.py
+++ b/scripts/mbedtls_dev/ecp.py
@@ -90,6 +90,21 @@
     input_values = [
         "0", "1",
 
+        # Modulus - 1
+        "ffffffffffffffffffffffffffffffff000000000000000000000000",
+
+        # Maximum canonical P224 multiplication result
+        ("ffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+         "ffffffffffffffffffffffffffffffffffffffffffffffffffffffff"),
+
+        # Generate an overflow during reduction
+        ("00000000000000000000000000010000000070000000002000001000"
+         "FFFFFFFFFFFF9FFFFFFFFFE00000EFFF000070000000002000001003"),
+
+        # Generate an underflow during reduction
+        ("00000001000000000000000000000000000000000000000000000000"
+         "00000000000DC0000000000000000001000000010000000100000003"),
+
         # First 8 number generated by random.getrandbits(448) - seed(2,2)
         ("da94e3e8ab73738fcf1822ffbc6887782b491044d5e341245c6e4337"
          "15ba2bdd177219d30e7a269fd95bafc8f2a4d27bdcf4bb99f4bea973"),