diff --git a/include/crypto/aes-round.h b/include/crypto/aes-round.h
new file mode 100644
index 0000000000..d675d2468f
--- /dev/null
+++ b/include/crypto/aes-round.h
@@ -0,0 +1,44 @@
+/*
+ * AES round fragments, generic version
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Copyright (C) 2023 Linaro, Ltd.
+ */
+
+#ifndef CRYPTO_AES_ROUND_H
+#define CRYPTO_AES_ROUND_H
+
+/* Hosts with acceleration will usually need a 16-byte vector type. */
+typedef uint8_t AESStateVec __attribute__((vector_size(16)));
+
+typedef union {
+ uint8_t b[16];
+ uint32_t w[4];
+ uint64_t d[4];
+ AESStateVec v;
+} AESState;