diff --git a/libs/commons-codec.jar b/libs/commons-codec.jar
deleted file mode 100644
index 957b6752..00000000
Binary files a/libs/commons-codec.jar and /dev/null differ
diff --git a/libs/guava-r09.jar b/libs/guava-r09.jar
deleted file mode 100644
index f8da8b1c..00000000
Binary files a/libs/guava-r09.jar and /dev/null differ
diff --git a/src/net/sqlcipher/DatabaseUtils.java b/src/net/sqlcipher/DatabaseUtils.java
index 6ed8b15c..785aa278 100644
--- a/src/net/sqlcipher/DatabaseUtils.java
+++ b/src/net/sqlcipher/DatabaseUtils.java
@@ -32,8 +32,6 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import org.apache.commons.codec.binary.Hex;
-
 import android.content.ContentValues;
 import android.content.OperationApplicationException;
 import android.os.Parcel;
@@ -323,10 +321,23 @@ public static String getCollationKey(String name) {
      */
     public static String getHexCollationKey(String name) {
         byte [] arr = getCollationKeyInBytes(name);
-        char[] keys = Hex.encodeHex(arr);
+        char[] keys = encodeHex(arr, HEX_DIGITS_LOWER);
         return new String(keys, 0, getKeyLen(arr) * 2);
     }
 
+    private static final char[] HEX_DIGITS_LOWER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+    private static char[] encodeHex(final byte[] data, final char[] toDigits) {
+	        final int l = data.length;
+	        final char[] out = new char[l << 1];
+	        // two characters form the hex value.
+	        for (int i = 0, j = 0; i < l; i++) {
+	            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
+	            out[j++] = toDigits[0x0F & data[i]];
+	        }
+	        return out;
+	}
+
     private static int getKeyLen(byte[] arr) {
         if (arr[arr.length - 1] != 0) {
             return arr.length;
diff --git a/src/net/sqlcipher/database/SQLiteDatabase.java b/src/net/sqlcipher/database/SQLiteDatabase.java
index e37cd1ab..0832225e 100644
--- a/src/net/sqlcipher/database/SQLiteDatabase.java
+++ b/src/net/sqlcipher/database/SQLiteDatabase.java
@@ -52,8 +52,6 @@
 import android.util.Log;
 import android.util.Pair;
 
-import com.google.common.collect.Maps;
-
 /**
  * Exposes methods to manage a SQLite database.
  * <p>SQLiteDatabase has methods to create, delete, execute SQL commands, and
@@ -320,7 +318,7 @@ public static void loadLibs (Context context, File workingDir)
      * (@link setMaxCacheSize(int)}). its default is 0 - i.e., no caching by default because
      * most of the apps don't use "?" syntax in their sql, caching is not useful for them.
      */
-    /* package */ Map<String, SQLiteCompiledSql> mCompiledQueries = Maps.newHashMap();
+    /* package */ Map<String, SQLiteCompiledSql> mCompiledQueries = new HashMap<String, SQLiteCompiledSql>();
     /**
      * @hide
      */