fix: Refactor crypto

crypto/internal/testutils.go

@@ -1,21 +0,0 @@
-//
-// 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
-}