Forgotten :(

ROM2/mic.c

+#include "mic.h"
+#include "types.h"
+#include "vend.h"
+#include "xmodem.h"
+
+void mic_set_secret(char newsecret[16]) {
+	my_strncpy(mic_secret, newsecret, 16);
+}
+
+bool mic_verify(void* msg) {
+	char *message, *p;
+	message = (char*)msg;
+	p = message;
+	while (*p != '\0' && *p != '|') p++;
+	if (*p == '\0') return 0;
+	u16 crc1 = docrc((char*)&current_challenge, 2, 0, 0);
+	crc1 = docrc(mic_secret, 16, 0, crc1);
+	crc1 = docrc(message, p-message, 0, crc1);
+	u16 crc2;
+	p++;
+	if (*(p) == '\0' ||
+		*(p+1) == '\0' ||
+		*(p+2) == '\0' ||
+		*(p+3) == '\0' ||
+		*(p+4) != '\0')
+		return 0;
+	crc2 = hex2u8(*p, *(p+1)) << 8;
+	crc2 |= hex2u8(*(p+2), *(p+3));
+
+	if (crc1 != crc2) return 0;
+
+	current_challenge++;
+	return 1;
+}

ROM2/mic.h

+#ifndef _MIC_H_
+#define _MIC_H_
+
+#include "types.h"
+
+#define current_challenge (*((u16*)(_nvram+0)))
+#define mic_secret (((char*)_nvram)+2)
+
+#define mic_challenge current_challenge
+void mic_set_secret(char newsecret[16]);
+bool mic_verify(void* message);
+
+#endif /* _MIC_H_ */