crypto: Add aesenc_SB_SR_AK

Start adding infrastructure for accelerating guest AES.
Begin with a SubBytes + ShiftRows + AddRoundKey primitive.

Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/crypto/aes-round.h b/include/crypto/aes-round.h
new file mode 100644
index 0000000..b85db1a
--- /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[2];
+    AESStateVec v;
+} AESState;
+
+#include "host/crypto/aes-round.h"
+
+/*
+ * Perform SubBytes + ShiftRows + AddRoundKey.
+ */
+
+void aesenc_SB_SR_AK_gen(AESState *ret, const AESState *st,
+                         const AESState *rk);
+void aesenc_SB_SR_AK_genrev(AESState *ret, const AESState *st,
+                            const AESState *rk);
+
+static inline void aesenc_SB_SR_AK(AESState *r, const AESState *st,
+                                   const AESState *rk, bool be)
+{
+    if (HAVE_AES_ACCEL) {
+        aesenc_SB_SR_AK_accel(r, st, rk, be);
+    } else if (HOST_BIG_ENDIAN == be) {
+        aesenc_SB_SR_AK_gen(r, st, rk);
+    } else {
+        aesenc_SB_SR_AK_genrev(r, st, rk);
+    }
+}
+
+#endif /* CRYPTO_AES_ROUND_H */