Switch to byte array.

// FREEBIE

jobqueue/src/androidTest/java/org/whispersystems/jobqueue/JobManagerTest.java

@@ -62,7 +62,7 @@ public class JobManagerTest extends AndroidTestCase {
   }
 
   public void testEncryptedJobExecuton() throws InterruptedException {
-    EncryptionKeys            keys        = new EncryptionKeys("foobar");
+    EncryptionKeys            keys        = new EncryptionKeys(new byte[30]);
     PersistentMockRequirement requirement = new PersistentMockRequirement();
     PersistentTestJob         testJob     = new PersistentTestJob(requirement, keys);
     JobManager                jobManager  = new JobManager(getContext(), "persistent-requirement-test4", null, new JavaJobSerializer(getContext()), 1);

jobqueue/src/main/java/org/whispersystems/jobqueue/EncryptionKeys.java

@@ -2,13 +2,13 @@ package org.whispersystems.jobqueue;
 
 public class EncryptionKeys {
 
-  private transient final String keys;
+  private transient final byte[] encoded;
 
-  public EncryptionKeys(String keys) {
+  public EncryptionKeys(byte[] encoded) {
-    this.keys = keys;
+    this.encoded = encoded;
   }
 
-  public String getKeys() {
+  public byte[] getEncoded() {
-    return keys;
+    return encoded;
   }
 }