v1.2.1 - Excluded apache library

src/main/java/com/lowlevelsubmarine/applock/Hex.java

@@ -1,15 +1,41 @@
 package com.lowlevelsubmarine.applock;
 
-import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
-
 public class Hex {
 
-    public static String encode(byte[] decoded) {
-        return HexBin.encode(decoded).toLowerCase();
+    private static final char[] HEX_CODE = "0123456789abcdef".toCharArray();
+
+    public static String encode(byte[] data) {
+        StringBuilder r = new StringBuilder(data.length*2);
+        for ( byte b : data) {
+            r.append(HEX_CODE[(b >> 4) & 0xF]);
+            r.append(HEX_CODE[(b & 0xF)]);
+        }
+        return r.toString();
+    }
+
+    public static byte[] decode(String s) {
+        final int len = s.length();
+        // "111" is not a valid hex encoding.
+        if( len%2 != 0 ) {
+            throw new IllegalArgumentException("hexBinary needs to be even-length: " + s);
+        }
+        byte[] out = new byte[len/2];
+        for( int i=0; i<len; i+=2 ) {
+            int h = hexToBin(s.charAt(i  ));
+            int l = hexToBin(s.charAt(i+1));
+            if( h==-1 || l==-1 ) {
+                throw new IllegalArgumentException("contains illegal character for hexBinary: " + s);
+            }
+            out[i/2] = (byte)(h*16+l);
+        }
+        return out;
     }
 
-    public static byte[] decode(String encoded) {
-        return HexBin.decode(encoded);
+    private static int hexToBin(char ch) {
+        if('0'<=ch && ch<='9') return ch-'0';
+        if('A'<=ch && ch<='F') return ch-'A'+10;
+        if('a'<=ch && ch<='f') return ch-'a'+10;
+        return -1;
     }
 
 }

src/main/java/com/lowlevelsubmarine/applock/Test.java

@@ -2,7 +2,7 @@
 
 public class Test {
 
-    private static final byte[] key = AppLock.generateKey(-239757427);
+    private static final byte[] key = AppLock.generateKey(-239757428);
 
     public static void main(String[] args) {
         AppLock appLock = new AppLock(key);