hw/vmapple/aes: Introduce aes engine

VMApple contains an "aes" engine device that it uses to encrypt and
decrypt its nvram. It has trivial hard coded keys it uses for that
purpose.

Add device emulation for this device model.

Signed-off-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20241223221645.29911-10-phil@philjordan.eu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/util/hexdump.c b/util/hexdump.c
index ae0d4992dc..f29ffceb74 100644
--- a/util/hexdump.c
+++ b/util/hexdump.c
@@ -15,6 +15,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/cutils.h"
+#include "qemu/host-utils.h"
 
 static inline char hexdump_nibble(unsigned x)
 {
@@ -97,3 +98,20 @@ void qemu_hexdump(FILE *fp, const char *prefix,
     }
 
 }
+
+void qemu_hexdump_to_buffer(char *restrict buffer, size_t buffer_size,
+                            const uint8_t *restrict data, size_t data_size)
+{
+    size_t i;
+    uint64_t required_buffer_size;
+    bool overflow = umul64_overflow(data_size, 2, &required_buffer_size);
+    overflow |= uadd64_overflow(required_buffer_size, 1, &required_buffer_size);
+    assert(!overflow && buffer_size >= required_buffer_size);
+
+    for (i = 0; i < data_size; i++) {
+        uint8_t val = data[i];
+        *(buffer++) = hexdump_nibble(val >> 4);
+        *(buffer++) = hexdump_nibble(val & 0xf);
+    }
+    *buffer = '\0';
+}