anoopj commented on code in PR #17545:
URL: https://github.com/apache/iceberg/pull/17545#discussion_r3817625074


##########
api/src/main/java/org/apache/iceberg/EncryptedFile.java:
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@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iceberg;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.encryption.EncryptionManager;
+
+/**
+ * A file that may be encrypted. If it is encrypted, its encrypted key 
metadata is tracked in the
+ * table metadata encryption keys and is referenced by a key ID.
+ */
+public interface EncryptedFile {
+
+  /** Location of the file. */
+  String location();
+
+  /** Returns the encryption key ID for this file, or null if the file is not 
encrypted. */
+  String encryptionKeyID();
+
+  /** Decrypt and return the file key metadata */
+  ByteBuffer decryptKeyMetadata(EncryptionManager em);

Review Comment:
   Carry over from existing design, but this method feels like it belongs on 
the encryption service rather than on the file value type. The file only 
supplies the key ID. I don't think it can simply be dropped, though: the caller 
(`EncryptingFileIO`) is in api and EncryptionUtil is in core, so api can't call 
it directly.
   
    If we want it off EncryptedFile, the clean version is to move the operation 
onto EncryptionManager (impl already in core, and `EncryptingFileIO `already 
holds one), keyed by `encryptionKeyID()`. 
   
   It's fine if we want to do in a followup.
   
   cc @rdblue in case he has any thoughts. 



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