if err = r.Encryption.Validate(); err != nil {
			return err
		}
		newKeyID = strings.TrimPrefix(r.Encryption.Key, crypto.ARNPrefix)
		newKeyContext = r.Encryption.kmsContext
	}
	if err = rotateKey(ctx, []byte{}, newKeyID, []byte{}, r.Bucket, oi.Name, encMetadata, newKeyContext); err != nil {
		return err
	}

	// Since we are rotating the keys, make sure to update the metadata.
	oi.metadataOnly = true

		return key, crypto.ErrIncompatibleEncryptionMethod
	}

	k, err := crypto.SSEC.ParseHTTP(header)
	return k[:], err
}

// This function rotates old to new key.
func rotateKey(ctx context.Context, oldKey []byte, newKeyID string, newKey []byte, bucket, object string, metadata map[string]string, cryptoCtx kms.Context) error {
	kind, _ := crypto.IsEncrypted(metadata)
	switch kind {
	case crypto.S3:

     *
     * @param newEncryptionKey the new encryption key
     * @param newDecryptionKey the new decryption key
     * @throws GeneralSecurityException if key rotation fails
     */
    public void rotateKeys(byte[] newEncryptionKey, byte[] newDecryptionKey) throws GeneralSecurityException {
        if (closed) {
            throw new IllegalStateException("Cannot rotate keys on closed context");
        }