simplify from_backup example to omit the intermediate step

CHANGELOG.md

@@ -5,8 +5,8 @@ All notable changes to this project will be documented in this file. The format
 ## Table of Contents
 
 - [Unreleased](#unreleased)
-- [1.1.3 - 2024-09-03](#111---2024-09-02)
-- [1.1.2 - 2024-09-02](#111---2024-09-02)
+- [1.1.3 - 2024-09-03](#113---2024-09-03)
+- [1.1.2 - 2024-09-02](#112---2024-09-02)
 - [1.1.1 - 2024-08-28](#111---2024-08-28)
 - [1.1.0 - 2024-08-19](#110---2024-08-19)
 - [1.0.0 - 2024-06-06](#100---2024-06-06)

docs/examples/keyshares_pk_from_backup/from_backup.go

@@ -4,7 +4,6 @@ import (
 	"log"
 
 	ec "github.com/bitcoin-sv/go-sdk/primitives/ec"
-	keyshares "github.com/bitcoin-sv/go-sdk/primitives/keyshares"
 )
 
 func main() {
@@ -17,9 +16,7 @@ func main() {
 		"BVk1tcvJEbhUfZagStg15rFRxQDeLzgSN15rWkGhNf19.CUB7p6zK3JPBkBriRRGdWj4y3Z3qCfsaCYutmMWKv1VJ.3.bbc45478",
 	}
 
-	keyshares, _ := keyshares.NewKeySharesFromBackupFormat(shares)
-
-	pk, _ := ec.PrivateKeyFromKeyShares(keyshares)
+	pk, _ := ec.PrivateKeyFromBackupShares(shares)
 
 	if pk.Wif() == expectedWif {
 		log.Println("Private key:", pk.Wif())

util/big.go

@@ -54,10 +54,15 @@ func Umod(x *big.Int, y *big.Int) *big.Int {
 
 func NewRandomBigInt(byteLen int) *big.Int {
 	b := make([]byte, byteLen)
-	_, err := rand.Read(b)
-	if err != nil {
-		panic(err)
+	maxRetries := 10
+	// gracefully handle errors in low entropy environments
+	// or extreme resource constraints, embedded systems
+	for retries := 0; retries < maxRetries; retries++ {
+		_, err := rand.Read(b)
+		if err == nil {
+			return new(big.Int).SetBytes(b)
+		}
 	}
-
-	return new(big.Int).SetBytes(b)
+	// Failure here indicates a critical error
+	panic("failed to generate random big.Int")
 }