[GitHub] omalley edited a comment on issue #20: Encryption in Data Files

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omalley edited a comment on issue #20: Encryption in Data Files
URL: 
https://github.com/apache/incubator-iceberg/issues/20#issuecomment-443383660
 
 
   Ok, I'd separate out the key information from the encryption data:
   
   ```
   struct KeyDescription {
     String keyName;
     int keyVersion;
   }
   
   struct FileKey {
     KeyDescription key;
     byte[] decryptedKey;
     byte[] encryptedKey;
   }
   
   struct FileEncryptionMetadata {
     KeyDescription key;
     byte[] encryptedKey;
     byte[] iv;
     String algorithm;
   }
   
   interface KeyManager {
      // Create a key for a single file.
      FileKey createFileKey(String keyName);
   
      // Decrypt a single file key
      byte[] decryptKey(KeyDescription key, byte[] encryptedKey);
   
      // Decrypt a list of keys
      List<byte[]> decryptKeys(KeyDescription key, List<byte[]> encryptedKeys);
   }
   ```
   
   The KMS doesn't need the path, iv, or the algorithm. But I think this is 
starting to look good.

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