Master (#1262)

* clear

* feat: Add everything

* fix: Commenht

crypto/internal/testutils.go

@@ -0,0 +1,21 @@
+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package internal
+
+import (
+	"math/big"
+)
+
+// B10 creating a big.Int from a base 10 string. panics on failure to
+// ensure zero-values aren't used in place of malformed strings.
+func B10(s string) *big.Int {
+	x, ok := new(big.Int).SetString(s, 10)
+	if !ok {
+		panic("Couldn't derive big.Int from string")
+	}
+	return x
+}