From 225a889b34ee1172b6ce0d95346a53320549b489 Mon Sep 17 00:00:00 2001
From: Tau <tau@nowhere>
Date: Sat, 19 Oct 2019 15:50:36 -0400
Subject: [PATCH] iccard/aime.c: Add (incomplete) AiMe card formatter

---
 iccard/aime.c      | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 iccard/aime.h      | 13 +++++++++++++
 iccard/meson.build |  2 ++
 3 files changed, 62 insertions(+)
 create mode 100644 iccard/aime.c
 create mode 100644 iccard/aime.h

diff --git a/iccard/aime.c b/iccard/aime.c
new file mode 100644
index 0000000..5d2b1cd
--- /dev/null
+++ b/iccard/aime.c
@@ -0,0 +1,47 @@
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "iccard/aime.h"
+#include "iccard/mifare.h"
+
+#include "util/dprintf.h"
+
+HRESULT aime_card_populate(
+        struct mifare *mifare,
+        const uint8_t *luid,
+        size_t nbytes)
+{
+    uint8_t b;
+    size_t i;
+
+    assert(mifare != NULL);
+    assert(luid != NULL);
+
+    memset(mifare, 0, sizeof(*mifare));
+
+    if (nbytes != 10) {
+        dprintf("AiMe IC: LUID must be 10 bytes\n");
+
+        return E_INVALIDARG;
+    }
+
+    for (i = 0 ; i < 10 ; i++) {
+        b = luid[i];
+
+        if ((b & 0xF0) > 0x90 || (b & 0x0F) > 0x09) {
+            dprintf("AiMe IC: LUID must be binary-coded decimal\n");
+            return E_INVALIDARG;
+        }
+
+        mifare->sectors[0].blocks[2].bytes[6 + i] = b;
+    }
+
+    /* TODO An authentic Aime pass has a checksum of the LUID in the last few
+       bytes of block 1. The output of this function fails authenticity check
+       in its current form. */
+
+    dprintf("AiMe IC: WARNING: Authenticity hash not yet implemented!\n");
+
+    return S_OK;
+}
diff --git a/iccard/aime.h b/iccard/aime.h
new file mode 100644
index 0000000..34857ef
--- /dev/null
+++ b/iccard/aime.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "iccard/mifare.h"
+
+HRESULT aime_card_populate(
+        struct mifare *mifare,
+        const uint8_t *luid,
+        size_t nbytes);
diff --git a/iccard/meson.build b/iccard/meson.build
index 08c5a3f..e068ae0 100644
--- a/iccard/meson.build
+++ b/iccard/meson.build
@@ -7,6 +7,8 @@ iccard_lib = static_library(
         capnhook.get_variable('hook_dep'),
     ],
     sources : [
+        'aime.c',
+        'aime.h',
         'felica.c',
         'felica.h',
         'mifare.h',