diff --git a/__crypto/crypto2-demo/Cargo.lock b/__crypto/crypto2-demo/Cargo.lock
new file mode 100644
index 0000000..3f0fc90
--- /dev/null
+++ b/__crypto/crypto2-demo/Cargo.lock
@@ -0,0 +1,31 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "crypto2"
+version = "0.2.0"
+source = "git+https://github.com/shadowsocks/crypto2#dbfd3bb4751abd9945370dee25350765039d050a"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "crypto2-demo"
+version = "0.1.0"
+dependencies = [
+ "crypto2",
+ "hex",
+]
+
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
diff --git a/__crypto/crypto2-demo/Cargo.toml b/__crypto/crypto2-demo/Cargo.toml
new file mode 100644
index 0000000..f9c882d
--- /dev/null
+++ b/__crypto/crypto2-demo/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "crypto2-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+crypto2 = { version = "0.2.0", git = "https://github.com/shadowsocks/crypto2" }
+hex = "0.4.3"
diff --git a/__crypto/crypto2-demo/src/main.rs b/__crypto/crypto2-demo/src/main.rs
new file mode 100644
index 0000000..c254922
--- /dev/null
+++ b/__crypto/crypto2-demo/src/main.rs
@@ -0,0 +1,24 @@
+use crypto2::blockcipher::Aes128;
+
+fn main() {
+    let key = [
+        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
+        0x0f,
+    ];
+    let plaintext = [
+        0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee,
+        0xff,
+    ];
+
+    let cipher = Aes128::new(&key);
+
+    let mut ciphertext = plaintext.clone();
+    cipher.encrypt(&mut ciphertext);
+
+    let mut cleartext = ciphertext.clone();
+    cipher.decrypt(&mut cleartext);
+
+    println!("plaintext : {:?}", &plaintext[..]);
+    println!("ciphertext: {:?}", &ciphertext[..]);
+    println!("cleartext : {:?}", &cleartext[..]);
+}