Changed metadata encryption to have a new dictionary type: d:encrypted

- Properties have to be encrypted and decrypted in code using MetadataEncryptor ('metadataEncryptor')
   - No conversion, encryption or decryption is done by Alfresco
   - Unencrypted values cannot be persisted and get thrown out
   - ALF-8646: RINF 38: Text data encryption
   - ALF-8956: RINF 38: Encryption key password specified by installer
   - ALF-9055: RINF 38: Support encryption against existing data


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@28480 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/security/encryption/AbstractKeyProvider.java

@@ -1,21 +1,17 @@
 package org.alfresco.repo.security.encryption;
 
-import java.security.Key;
-
-import org.alfresco.util.ParameterCheck;
-
 /**
  * Basic support for key providers
+ * <p/>
+ * TODO: This class will provide the alias name mapping so that use-cases can be mapped
+ * to different alias names in the keystore.
  * 
  * @author Derek Hulley
  * @since 4.0
  */
 public abstract class AbstractKeyProvider implements KeyProvider
 {
-    @Override
-    public Key getKey(AlfrescoKeyAlias keyAlias)
-    {
-        ParameterCheck.mandatory("keyAlias", keyAlias);
-        return getKey(keyAlias.name());
-    }
+    /*
+     * Not a useless class.
+     */
 }