3.1.4.18.3.5 ServerSyncFileDecryption

 <s:complexType name="ServerSyncFileDecryption">
      <s:sequence>
        <s:element minOccurs="0" maxOccurs="1" name="FileDigest" type="s:base64Binary" />
        <s:element minOccurs="0" maxOccurs="1" name="DecryptionKey" type="s:base64Binary" />
      </s:sequence>
 </s:complexType>

FileDigest: The SHA-1 hash of the content file.

DecryptionKey: The hash representing the decryption key associated with an encrypted file. This field MUST be present if the associated file metadata indicates the file is encrypted.