Refactor: Simplify DecryptionFilter#execute
Refactor: Simplify DecryptionFilter#execute

This just moves code around, but definitely makes it read better.  More than
likely what we need here is another object which is responsible simply for doing
the encryption/decryption and storing the keys.

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Change-Id:     Ibb37fc3f8243f92665a52de71496442ee7d5ba20
Signed-off-by: Jeff Felchner <8a84c204e2d4c387d61d20f7892a2bbbf0bc8ae8@thekompanee.com>

hlogmans/chamber,hlogmans/chamber