core/signer, clef: improve ui-test flow, fix errors in uint handling (#19584)

* core/signer, clef: improve ui-test flow, fix errors in uint handling for eip-712

* core/signer: add fuzzer testcases + crashfixes

* signer: address review concerns, check sign in integer parsing

1 files changed, 7 insertions, 0 deletions

diff --git a/common/math/big.go b/common/math/big.go
index 9d2e7946d..d31c59af1 100644
--- a/common/math/big.go
+++ b/common/math/big.go
@@ -42,6 +42,13 @@ const (
 // HexOrDecimal256 marshals big.Int as hex or decimal.
 type HexOrDecimal256 big.Int
 
+// NewHexOrDecimal256 creates a new HexOrDecimal256
+func NewHexOrDecimal256(x int64) *HexOrDecimal256 {
+	b := big.NewInt(x)
+	h := HexOrDecimal256(*b)
+	return &h
+}
+
 // UnmarshalText implements encoding.TextUnmarshaler.
 func (i *HexOrDecimal256) UnmarshalText(input []byte) error {
 	bigint, ok := ParseBig256(string(input))