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diff --git a/OpenPGP-Keychain/src/com/google/zxing/common/Collections.java b/OpenPGP-Keychain/src/com/google/zxing/common/Collections.java
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+++ b/OpenPGP-Keychain/src/com/google/zxing/common/Collections.java
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+/*
+ * Copyright 2007 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.common;
+
+import java.util.Vector;
+
+/**
+ * <p>This is basically a substitute for <code>java.util.Collections</code>, which is not
+ * present in MIDP 2.0 / CLDC 1.1.</p>
+ *
+ * @author Sean Owen
+ */
+public final class Collections {
+
+  private Collections() {
+  }
+
+  /**
+   * Sorts its argument (destructively) using insert sort; in the context of this package
+   * insertion sort is simple and efficient given its relatively small inputs.
+   *
+   * @param vector vector to sort
+   * @param comparator comparator to define sort ordering
+   */
+  public static void insertionSort(Vector vector, Comparator comparator) {
+    int max = vector.size();
+    for (int i = 1; i < max; i++) {
+      Object value = vector.elementAt(i);
+      int j = i - 1;
+      Object valueB;
+      while (j >= 0 && comparator.compare((valueB = vector.elementAt(j)), value) > 0) {
+        vector.setElementAt(valueB, j + 1);
+        j--;
+      }
+      vector.setElementAt(value, j + 1);
+    }
+  }
+
+}