w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionAES)
	case crypto.S3KMS:
		w.Header().Set(xhttp.AmzServerSideEncryption, xhttp.AmzEncryptionKMS)
		w.Header().Set(xhttp.AmzServerSideEncryptionKmsID, objInfo.KMSKeyID())
		if kmsCtx, ok := objInfo.UserDefined[crypto.MetaContext]; ok {
			w.Header().Set(xhttp.AmzServerSideEncryptionKmsContext, kmsCtx)
		}
	case crypto.SSEC:
		// Validate the SSE-C Key set in the header.

		// specified, MinIO is supposed to use whatever default
		// config applies on the site or bucket.
		var keyID string
		if kms.ReplicateKeyID() {
			keyID = objInfo.KMSKeyID()
		}

		sseEnc, err := encrypt.NewSSEKMS(keyID, nil)
		if err != nil {
			return putOpts, false, err
		}
		putOpts.ServerSideEncryption = sseEnc
	}
	return putOpts, isMP, err
}