SEC-1752: Fixed Utf8 codec to take account of the limit of the ByteBuffer returned by CharsetEncoder.encode().

core/src/test/java/org/springframework/security/crypto/codec/Utf8Tests.java

@@ -0,0 +1,25 @@
+package org.springframework.security.crypto.codec;
+
+import static org.junit.Assert.*;
+
+import org.junit.*;
+
+import java.util.*;
+
+/**
+ * @author Luke Taylor
+ */
+public class Utf8Tests {
+
+    // SEC-1752
+    @Test
+    public void utf8EncodesAndDecodesCorrectly() throws Exception {
+        byte[] bytes = Utf8.encode("6048b75ed560785c");
+        assertEquals(16, bytes.length);
+        assertTrue(Arrays.equals("6048b75ed560785c".getBytes("UTF-8"), bytes));
+
+        String decoded = Utf8.decode(bytes);
+
+        assertEquals("6048b75ed560785c", decoded);
+    }
+}