Andreas Auernhammer 15771ebe8d Fix decrypted object size and key derivation in CopyObjectPart (#6141)
This commit fixes the size calculation for multipart
objects. The decrypted size of an encrypted multipart
object is the sum of the decrypted part sizes.

Also fixes the key derivation in CopyObjectPart.
Instead of using the same object-encryption-key for each
part now an unique per-part key is derived.

Updates #6139
2018-07-12 21:59:56 +05:30
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