First commit

src/main/java/cli/Util.java

@@ -0,0 +1,25 @@
+package cli;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+public class Util {
+    public static String getSecret(int size) {
+        byte[] secret = getSecretBytes(size);
+        return Base64.encodeBytes(secret);
+    }
+
+    public static byte[] getSecretBytes(int size) {
+        byte[] secret = new byte[size];
+        getSecureRandom().nextBytes(secret);
+        return secret;
+    }
+
+    public static SecureRandom getSecureRandom() {
+        try {
+            return SecureRandom.getInstance("SHA1PRNG");
+        } catch (NoSuchAlgorithmException e) {
+            throw new AssertionError(e);
+        }
+    }
+}