Add emulateme.pic18f2520.elf (#149)

pic/emulateme.c

@@ -0,0 +1,26 @@
+#include <stdint.h>
+#define LEN 0x10
+
+static const uint8_t parity_ref = 0x58;
+static char seckrit[LEN + 1] = { 0x51, 0x53, 0x4d, 0x77, 0x58, 0x14, 0x51, 0x5f, 0x45, 0x6c, 0x17, 0x7f, 0x6e, 0x78, 0x7f, 0x1c };
+
+uint8_t decrypt(const char *key) {
+	uint8_t parity = 0;
+	for (uint8_t i = 0; i < LEN; i++) {
+		seckrit[i] ^= key[i];
+		parity ^= seckrit[i];
+	}
+	if (parity != parity_ref) {
+		return 0;
+	}
+	for (uint8_t i = 0; i < LEN; i++) {
+		seckrit[i] ^= parity;
+	}
+	return 1;
+}
+
+int main(int argc, const char *argv[]) {
+	const char *key = "AnyColourYouLike";
+	decrypt(key);
+	return 0;
+}