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Cargo.toml
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[package]
name = "static_encrypt"
version = "0.1.0"
edition = "2024"
authors = ["5mukx <staffs@5mukx.site>"]
description = "Compile-time / static string encryption for Rust"
readme = "README.md"
homepage = "https://github.com/Whitecat18/static_encrypt"
repository = "https://github.com/Whitecat18/static_encrypt"
license = "Apache-2.0"
keywords = ["encryption", "obfuscation", "string", "static", "compile-time"]
categories = ["cryptography", "no-std", "encoding"]
exclude = [".github", "tests/data/*", "target/*", "Cargo.lock"]
[[test]]
name = "test"
path = "tests/test.rs"
[lib]
proc-macro = true
[dependencies]
lazy_static = "1.5.0"
proc-macro2 = "1.0.105"
quote = "1.0.43"
rand = "0.9.2"
[dev-dependencies]
trybuild = "1.0"
[build-dependencies]
rand = "0.9"
[features]
default = ["xor"]
xor = []
rc4 = []
xorshift = []
vigenere = []
lcg = []
xorr = []
LICENSE-APACHE
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LICENSE-MIT
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MIT License
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README.md
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# Static Encrypt
**Protect your strings from static analysis tools.**
`static_encrypt` is a Rust proc-macro crate that encrypts string literals at **compile time**. The plain text strings never appear in your compiled binary. They are encrypted using a **unique, random key generated during every build**, and only decrypted at runtime when needed.
This crate is a modernized and advanced version, featuring 6 different encryption algorithms and automatic key management.
## Features
* **Compile-Time Encryption:** Strings are encrypted before they ever reach the binary.
* **Unique Random Keys:** A fresh random key is generated automatically via `build.rs` every time you compile. No need to manage environment variables manually.
* **6 Encryption Algorithms:** Choose the balance of speed and obfuscation that fits your needs.
* **Zero Dependencies (Runtime):** Extremely lightweight runtime footprint.
* **UTF-8 Support:** Full support for Emoji, CJK (Chinese/Japanese/Korean), and Cyrillic characters.
## Installation
```bash
cargo add static_encrypt
```
(or)
Add this to your `Cargo.toml`:
```toml
[dependencies]
static_encrypt = "0.1.0"
```
## Usage
Example:
```rust
#[macro_use]
extern crate static_encrypt;
// Initialize the decryption runtime.
// This injects the decryption code specific to your selected algorithm.
set_crypt!();
fn main() {
// Use enc!() to encrypt strings.
let message = enc!("This is a secret message");
println!("Message: {}", message);
}
```
Real Example:
```rust
#[macro_use]
extern crate static_encrypt;
set_crypt!();
use reqwest::header::{AUTHORIZATION, HeaderValue};
use reqwest::Client;
use std::env;
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let enc_key =
let api_key = std::env::var(enc!("TEST"))
.expect("MY_API_KEY not set in environment variables");
let client = Client::new();
let url = enc!("https://api.example.com/data");
let response = client.get(url)
.header(AUTHORIZATION, format!("Bearer {}", api_key))
.send()
.await?
.text()
.await?;
println!("Response: {}", response);
Ok(())
}
```
### 2. Switching Algorithms
You can change the underlying encryption algorithm using **Cargo Features**. The default is `xor`.
To use **RC4** (Stream Cipher):
```toml
[dependencies]
static_encrypt = { version = "0.1.0", features = ["rc4"] }
```
To use **XorR** (Rolling Key XOR - harder to crack):
```toml
[dependencies]
static_encrypt = { version = "0.1.0", features = ["xorr"] }
```
## Supported Algorithms
Select one via `features` in `Cargo.toml`.
| Feature | Algorithm | Description | Strength |
| --- | --- | --- | --- |
| **`xor`** | **XOR (Default)** | Classic repeating-key XOR. | Low (Fastest) |
| `rc4` | **RC4** | Rivest Cipher 4 (Stream Cipher). | Medium |
| `xorshift` | **XorShift** | Uses a Pseudo-Random Number Generator (PRNG) as a keystream. | Medium |
| `xorr` | **Rolling XOR** | Key bits rotate/roll after every byte. Prevents simple frequency analysis. | Medium-High |
| `vigenere` | **Vigenère** | Polyalphabetic substitution (Addition/Subtraction). | Low |
| `lcg` | **LCG** | Linear Congruential Generator stream. | Low-Medium |
## How It Works
1. **Build Script (`build.rs`):** When you run `cargo build`, this script runs first. It generates a high-entropy random key (64 bytes) and saves it into the compilation environment.
2. **Macro Expansion:** The `enc!("string")` macro reads this key, encrypts your string using the selected algorithm (e.g., RC4), and replaces your string with a byte array: `[23, 114, 210, ...]`.
3. **Runtime:** The `set_crypt!()` macro injects a tiny decryptor function. When your program runs, it takes the byte array and decrypts it back to a string in memory.
## License
- Apache License, Version 2.0, ([LICENSE-APACHE](./LICENSE-APACHE) or
<https://www.apache.org/licenses/LICENSE-2.0>)
- MIT license ([LICENSE-MIT](./LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
build.rs
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use rand::{rngs::OsRng, TryRngCore};
fn main() {
// gen random key on compile time
let mut key = [0u8; 64];
OsRng.try_fill_bytes(&mut key).unwrap();
let key_string = key
.iter()
.map(|b| b.to_string())
.collect::<Vec<String>>()
.join(",");
println!("cargo:rustc-env=LITCRYPT_KEY={}", key_string);
println!("cargo:rerun-if-changed=build.rs");
}
src/lib.rs
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// Smukx.E (@5mukx)
extern crate proc_macro;
use proc_macro::{TokenStream, TokenTree};
use quote::{quote};
use proc_macro2::{Literal};
fn get_compile_time_key() -> Vec<u8> {
let key_str = env!("LITCRYPT_KEY");
key_str.split(',')
.map(|s| s.parse::<u8>().expect("Failed to parse key from build.rs"))
.collect()
}
#[proc_macro]
pub fn set_crypt(_input: TokenStream) -> TokenStream {
let decrypt_code = if cfg!(feature = "rc4") {
emit_rc4_decrypt()
} else if cfg!(feature = "xorshift") {
emit_xorshift_decrypt()
} else if cfg!(feature = "vigenere") {
emit_vigenere_decrypt()
} else if cfg!(feature = "lcg") {
emit_lcg_decrypt()
} else if cfg!(feature = "xorr") {
emit_xorr_decrypt()
} else {
emit_xor_decrypt()
};
let master_key = get_compile_time_key();
let master_key_enc = encrypt_xor(&master_key, b"code/rustc/e5b2d8f9a1c3049687db03746cdf8af4d86e9ca4/library/alloc/src/vec/mod.rs");
let master_key_lit = Literal::byte_string(&master_key_enc);
quote! {
pub mod litcrypt_internal {
pub fn decrypt_final(encrypted: &[u8]) -> String {
let key_enc = #master_key_lit;
// Confuse while analysis =)
let master_key = decrypt_xor_internal(key_enc, b"code/rustc/e5b2d8f9a1c3049687db03746cdf8af4d86e9ca4/library/alloc/src/vec/mod.rs");
let decrypted_bytes = decrypt_bytes(encrypted, &master_key);
String::from_utf8(decrypted_bytes).unwrap_or(String::from("???"))
}
fn decrypt_xor_internal(source: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::with_capacity(source.len());
for (i, byte) in source.iter().enumerate() {
out.push(byte ^ key[i % key.len()]);
}
out
}
#decrypt_code
}
}.into()
}
#[proc_macro]
pub fn enc(tokens: TokenStream) -> TokenStream {
let mut input_str = String::new();
for tok in tokens {
if let TokenTree::Literal(lit) = tok {
let s = lit.to_string();
if s.starts_with("r") {
if let Some(start_quote) = s.find('"') {
let num_hashes = start_quote - 1;
let end_quote = s.len() - 1 - num_hashes;
input_str = s[start_quote + 1..end_quote].to_string();
}
} else if s.starts_with('"') {
input_str = s.trim_matches('"').to_string();
input_str = input_str.replace("\\\"", "\"").replace("\\\\", "\\");
} else {
input_str = s;
}
}
}
let key = get_compile_time_key();
let encrypted_bytes = if cfg!(feature = "rc4") {
encrypt_rc4(input_str.as_bytes(), &key)
} else if cfg!(feature = "xorshift") {
encrypt_xorshift(input_str.as_bytes(), &key)
} else if cfg!(feature = "vigenere") {
encrypt_vigenere(input_str.as_bytes(), &key)
} else if cfg!(feature = "lcg") {
encrypt_lcg(input_str.as_bytes(), &key)
} else if cfg!(feature = "xorr") {
encrypt_xorr(input_str.as_bytes(), &key)
} else {
encrypt_xor(input_str.as_bytes(), &key)
};
let bytes_lit = Literal::byte_string(&encrypted_bytes);
quote! {
crate::litcrypt_internal::decrypt_final(#bytes_lit)
}.into()
}
// encryption algorithm starts here .....
fn encrypt_xor(source: &[u8], key: &[u8]) -> Vec<u8> {
source.iter().enumerate().map(|(i, b)| b ^ key[i % key.len()]).collect()
}
fn emit_xor_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(source: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::with_capacity(source.len());
for (i, byte) in source.iter().enumerate() {
out.push(byte ^ key[i % key.len()]);
}
out
}
}
}
fn encrypt_rc4(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut s: [u8; 256] = [0; 256];
let mut j: usize = 0;
for i in 0..=255 { s[i] = i as u8; }
for i in 0..=255 {
j = (j + s[i] as usize + key[i % key.len()] as usize) % 256;
s.swap(i, j);
}
let mut i = 0; j = 0;
let mut out = Vec::new();
for &b in data {
i = (i + 1) % 256;
j = (j + s[i] as usize) % 256;
s.swap(i, j);
let k = s[(s[i] as usize + s[j] as usize) % 256];
out.push(b ^ k);
}
out
}
fn emit_rc4_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut s: [u8; 256] = [0; 256];
let mut j: usize = 0;
for i in 0..=255 { s[i] = i as u8; }
for i in 0..=255 {
j = (j + s[i] as usize + key[i % key.len()] as usize) % 256;
let tmp = s[i]; s[i] = s[j]; s[j] = tmp;
}
let mut i = 0; j = 0;
let mut out = Vec::new();
for &b in data {
i = (i + 1) % 256;
j = (j + s[i] as usize) % 256;
let tmp = s[i]; s[i] = s[j]; s[j] = tmp;
let k = s[(s[i] as usize + s[j] as usize) % 256];
out.push(b ^ k);
}
out
}
}
}
fn encrypt_xorshift(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut seed: u32 = 0xCAFEBABE;
for &b in key { seed = seed.wrapping_add(b as u32).wrapping_mul(0x9E3779B9); }
if seed == 0 { seed = 0xDEADBEEF; }
let mut out = Vec::new();
let mut state = seed;
for &b in data {
let mut x = state;
x ^= x << 13; x ^= x >> 17; x ^= x << 5;
state = x;
out.push(b ^ (state as u8));
}
out
}
fn emit_xorshift_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut seed: u32 = 0xCAFEBABE;
for &b in key { seed = seed.wrapping_add(b as u32).wrapping_mul(0x9E3779B9); }
if seed == 0 { seed = 0xDEADBEEF; }
let mut out = Vec::new();
let mut state = seed;
for &b in data {
let mut x = state;
x ^= x << 13; x ^= x >> 17; x ^= x << 5;
state = x;
out.push(b ^ (state as u8));
}
out
}
}
}
fn encrypt_vigenere(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::new();
for (i, &b) in data.iter().enumerate() {
let k = key[i % key.len()];
out.push(b.wrapping_add(k));
}
out
}
fn emit_vigenere_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::new();
for (i, &b) in data.iter().enumerate() {
let k = key[i % key.len()];
out.push(b.wrapping_sub(k));
}
out
}
}
}
fn encrypt_lcg(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut seed: u32 = 0;
for &b in key { seed = seed.wrapping_add(b as u32); }
let a: u32 = 1664525;
let c: u32 = 1013904223;
let mut state = seed;
let mut out = Vec::new();
for &b in data {
state = state.wrapping_mul(a).wrapping_add(c);
let pad = (state >> 24) as u8;
out.push(b ^ pad);
}
out
}
fn emit_lcg_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut seed: u32 = 0;
for &b in key { seed = seed.wrapping_add(b as u32); }
let a: u32 = 1664525;
let c: u32 = 1013904223;
let mut state = seed;
let mut out = Vec::new();
for &b in data {
state = state.wrapping_mul(a).wrapping_add(c);
let pad = (state >> 24) as u8;
out.push(b ^ pad);
}
out
}
}
}
fn encrypt_xorr(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::new();
let mut rolling_key = key.to_vec();
let len = rolling_key.len();
for (i, &b) in data.iter().enumerate() {
let idx = i % len;
let k = rolling_key[idx];
out.push(b ^ k);
rolling_key[idx] = k.rotate_left(1);
}
out
}
fn emit_xorr_decrypt() -> proc_macro2::TokenStream {
quote! {
fn decrypt_bytes(data: &[u8], key: &[u8]) -> Vec<u8> {
let mut out = Vec::new();
let mut rolling_key = key.to_vec();
let len = rolling_key.len();
for (i, &b) in data.iter().enumerate() {
let idx = i % len;
let k = rolling_key[idx];
out.push(b ^ k);
rolling_key[idx] = k.rotate_left(1);
}
out
}
}
}
tests/test.rs
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#[macro_use]
extern crate static_encrypt;
set_crypt!();
#[test]
fn basic_ascii() {
let plain = "Hello World";
let enc = enc!("Hello World");
assert_eq!(plain, enc);
}
#[test]
fn json_raw_string() {
let json = r#"{"status": "ok", "code": 200}"#;
let enc = enc!(r#"{"status": "ok", "code": 200}"#);
assert_eq!(json, enc);
}
#[test]
fn japanese_kanji_hiragana() {
let plain = "こんにちは世界";
let enc = enc!("こんにちは世界");
assert_eq!(plain, enc);
}
#[test]
fn chinese_simplified() {
let plain = "加密很有趣";
let enc = enc!("加密很有趣");
assert_eq!(plain, enc);
}
#[test]
fn russian_cyrillic() {
let plain = "Rust - это быстро";
let enc = enc!("Rust - это быстро");
assert_eq!(plain, enc);
}
#[test]
fn robust_special_chars() {
let plain = "Key: !@#$%^&*()_+|~=`{}[]:\";'<>?,./ ⚠️";
let enc_simple = enc!("Key: !@#$%^&*()_+|~=`{}[]:\";'<>?,./ ⚠️");
assert_eq!(plain, enc_simple);
}
#[test]
fn mixed_languages() {
let plain = "Hello - こんにちは - 你好 - Привет";
let enc = enc!("Hello - こんにちは - 你好 - Привет");
assert_eq!(plain, enc);
}