minPartSz = int64(5) * humanize.MiByte
		maxPartSz = int64(5) * humanize.GiByte

		getEncSize = func(s int64) int64 {
			v, _ := sio.EncryptedSize(uint64(s))
			return int64(v)
		}
		udMap = func(isMulti bool) map[string]string {
			m := map[string]string{
				crypto.MetaAlgorithm: crypto.InsecureSealAlgorithm,
				crypto.MetaMultipart: "1",
			}
			if !isMulti {
				delete(m, crypto.MetaMultipart)

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