DecryptionKeyRetriever (Apache Parquet Hadoop 1.12.0 API)

All Known Implementing Classes:

FileKeyUnwrapper
```
public interface DecryptionKeyRetriever
```
Interface for classes retrieving encryption keys using the key metadata. Implementations must be thread-safe, if same KeyRetriever object is passed to multiple file readers.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  byte[] getKey(byte[] keyMetaData)
  Returns encryption key using the key metadata.

- Method Detail
  - getKey
```
byte[] getKey(byte[] keyMetaData)
       throws KeyAccessDeniedException,
              ParquetCryptoRuntimeException
```
    Returns encryption key using the key metadata. If your key retrieval code throws runtime exceptions related to access control (permission) problems (such as Hadoop AccessControlException), catch them and throw the KeyAccessDeniedException.
    
    Parameters:
    
    keyMetaData - arbitrary byte array with encryption key metadata
    
    Returns:
    
    encryption key. Key length can be either 16, 24 or 32 bytes.
    
    Throws:
    
    KeyAccessDeniedException - thrown upon access control problems (authentication or authorization)
    
    ParquetCryptoRuntimeException - thrown upon key retrieval problems unrelated to access control