chkSums := objInfo.decryptChecksums(0, r.Header)
		// AWS does not appear to append part number on this API call.
		if len(chkSums) > 0 {
			OA.Checksum = &objectAttributesChecksum{
				ChecksumCRC32:  strings.Split(chkSums["CRC32"], "-")[0],
				ChecksumCRC32C: strings.Split(chkSums["CRC32C"], "-")[0],
				ChecksumSHA1:   strings.Split(chkSums["SHA1"], "-")[0],

		if isSSEC {
			meta[ReplicationSsecChecksumHeader] = base64.StdEncoding.EncodeToString(objInfo.Checksum)
		} else {
			for _, pi := range objInfo.Parts {
				if pi.Number == partNum {
					for k, v := range pi.Checksums {
						meta[k] = v
					}
				}
			}
		}
	}

	if sc == "" && (objInfo.StorageClass == storageclass.STANDARD || objInfo.StorageClass == storageclass.RRS) {
		sc = objInfo.StorageClass
	}