init

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "rust_comptime_encryption_example"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bincode = "1.3.3"
+serde = "1.0.130"
+
+[build-dependencies]
+base64 = "0.13.0"
+bincode = "1.3.3"
+serde = "1.0.130"
+serde_json = "1.0.68"

build.rs

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+use std::{
+    collections::HashMap,
+    fs::{self, File},
+    io::Read,
+    path::Path,
+};
+fn main() {
+    println!("cargo:rerun-if-changed=enc_data.json");
+    let mut file = File::open("enc_data.json").expect("Failed to open enc_data.json");
+    let mut content = vec![];
+    file.read_to_end(&mut content)
+        .expect("Failed to read enc_data.json");
+
+    let deserialized = serde_json::from_slice::<HashMap<String, String>>(&content)
+        .expect("Failed to deserialize enc_data.json");
+
+    let encrypted = deserialized
+        .into_iter()
+        .map(|(k, v)| (k, base64::encode(v)))
+        .collect::<HashMap<_, _>>();
+
+    let serialized =
+        bincode::serialize(&encrypted).expect("Failed to seralize enc_data.json to bincode");
+
+    let out_path = Path::new(&std::env::var("OUT_DIR").unwrap()).join("enc_data.bin");
+    fs::write(out_path, serialized).expect("Failed to write outfile");
+}

enc_data.json

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+{
+    "foo": "bar",
+    "some_key": "some_data"
+}

src/main.rs

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+use std::collections::HashMap;
+
+const ENC_DATA: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/enc_data.bin"));
+
+fn main() {
+    let enc_data = bincode::deserialize::<HashMap<String, String>>(ENC_DATA)
+        .expect("Failed to deserialize enc_data");
+
+    dbg!(enc_data);
+}