feat: add example

examples/encrypt_and_decrypt.rs

@@ -0,0 +1,30 @@
+use aes_gcm_stream::{Aes256GcmStreamDecryptor, Aes256GcmStreamEncryptor};
+use zeroize::Zeroize;
+
+fn main() {
+    // IMPORTANT! key and nonce SHOULD generate by random
+    let mut key = [0u8; 32];
+    let mut nonce = [0; 12];
+
+    let mut encryptor = Aes256GcmStreamEncryptor::new(key.clone(), &nonce);
+
+    let mut ciphertext = vec![];
+    ciphertext.extend_from_slice(&encryptor.update(b"Hello "));
+    ciphertext.extend_from_slice(&encryptor.update(b" World"));
+    ciphertext.extend_from_slice(&encryptor.update(b"!"));
+    let (last_block, tag) = encryptor.finalize();
+    ciphertext.extend_from_slice(&last_block);
+    ciphertext.extend_from_slice(&tag);
+
+    println!("Ciphertext: {}", hex::encode(&ciphertext));
+
+    let mut decryptor = Aes256GcmStreamDecryptor::new(key.clone(), &nonce);
+
+    let mut plaintext = vec![];
+    plaintext.extend_from_slice(decryptor.update(&ciphertext).as_slice());
+    plaintext.extend_from_slice(&decryptor.finalize().expect("decrypt error"));
+
+    println!("Plaintext: {}", String::from_utf8_lossy(&plaintext));
+    key.zeroize();
+    nonce.zeroize();
+}