Encryption UDF

[#1]

Hello,

I have a requirement to  decrypt  few columns in a  hive.The key is managed in its own appliance  and cannot  be brought  to the hadoop cluster  for security reasons.The  udfs that we  wrote  did not give me much performance.We would want to pass multiple row values in the same request  to decrypt.Should I look at something like generic udaf for this solution?.

Thanks