Ceph » rgw

When I use UploadPartCopyRequest to copy an encrypted object without a key, the request succeeds, but the result object is empty.
However, AWS S3 returns the 400 error with the message "The object was stored using server-side encryption format. You must provide the correct parameters to retrieve the object."

    bucket = get_new_bucket()

     content = 'fooz'
     srcobj = 'testobj_enc'
     content_type = 'text/plain'

     encrypt_headers = {
         'x-amz-server-side-encryption-customer-algorithm': 'AES256',
         'x-amz-server-side-encryption-customer-key': 'pO3upElrwuEXSoFwCfnZPdSsmt/xWeFa0N9KgDijwVs=',
         'x-amz-server-side-encryption-customer-key-md5': 'DWygnHRtgiJ77HCm+1rvHw==',
     }
     srckey = bucket.new_key(srcobj)
     srckey.set_contents_from_string(content, headers=encrypt_headers)

     key = "multipart" 
     init_headers = {
        'Content-Type': content_type
     }
     upload = bucket.initiate_multipart_upload(key)

     mp = boto.s3.multipart.MultiPartUpload(bucket)
     mp.key_name = upload.key_name
     mp.id = upload.id
     part = mp.copy_part_from_key(bucket.name, srcobj, 1)

     xml = "<Part><PartNumber>{0}</PartNumber><ETag>{1}</ETag></Part>".format(1, part.etag)
     xml = "<CompleteMultipartUpload>{0}</CompleteMultipartUpload>".format(xml)
     bucket.complete_multipart_upload(key, upload.id, xml)

    key = bucket.get_key(key)
    print(key.size)            # No error and its size is 0!