if srcChecksumDecrypted != nil {
				dstOpts.WantChecksum = hash.ChecksumFromBytes(srcChecksumDecrypted)

				// When an object is being copied from a source that is multipart, the destination will
				// no longer be multipart, and thus the checksum becomes full-object instead. Since
				// the CopyObject API does not require that the caller send us this final checksum, we need