}
			if len(etag) >= 32 && strings.Count(etag, "-") != 1 {
				etag = etag[len(etag)-32:]
			}
		case crypto.S3:
			w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionAES)
			etag, _ = DecryptETag(objectEncryptionKey, ObjectInfo{ETag: etag})
		case crypto.SSEC:
			w.Header().Set(xhttp.AmzServerSideEncryptionCustomerAlgorithm, r.Header.Get(xhttp.AmzServerSideEncryptionCustomerAlgorithm))

	if kind, encrypted := crypto.IsEncrypted(objInfo.UserDefined); encrypted {
		switch kind {
		case crypto.S3:
			w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionAES)
			objInfo.ETag, _ = DecryptETag(objectEncryptionKey, ObjectInfo{ETag: objInfo.ETag})
		case crypto.S3KMS:
			w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionKMS)
			w.Header().Set(xhttp.AmzServerSideEncryptionKmsID, objInfo.KMSKeyID())