initial public commit

tools/security/random.go

@@ -0,0 +1,21 @@
+package security
+
+import (
+	"crypto/rand"
+)
+
+// RandomString generates a random string of specified length.
+//
+// The generated string is cryptographically random and matches
+// [A-Za-z0-9]+ (aka. it's transparent to URL-encoding).
+func RandomString(length int) string {
+	const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
+	bytes := make([]byte, length)
+	rand.Read(bytes)
+	for i, b := range bytes {
+		bytes[i] = alphabet[b%byte(len(alphabet))]
+	}
+
+	return string(bytes)
+}