Add first version of gemini-grc.

util/util.go

@@ -0,0 +1,36 @@
+package util
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"math/big"
+	"runtime/debug"
+)
+
+func PrintStackAndPanic(err error) {
+	fmt.Printf("Error %s Stack trace:\n%s", err, debug.Stack())
+	panic("PANIC")
+}
+
+// SecureRandomInt returns a cryptographically secure random integer in the range [0,max).
+// Panics if max <= 0 or if there's an error reading from the system's secure
+// random number generator.
+func SecureRandomInt(max int) int {
+	// Convert max to *big.Int for crypto/rand operations
+	maxBig := big.NewInt(int64(max))
+
+	// Generate random number
+	n, err := rand.Int(rand.Reader, maxBig)
+	if err != nil {
+		PrintStackAndPanic(fmt.Errorf("could not generate a random integer between 0 and %d", max))
+	}
+
+	// Convert back to int
+	return int(n.Int64())
+}
+
+func PrettyJson(data string) string {
+	marshalled, _ := json.MarshalIndent(data, "", "  ")
+	return fmt.Sprintf("%s\n", marshalled)
+}