sm4-gcm加密解密测试代码:

fn main() {
    let key = Sm4Key([0u8; 16]);
    let nonce = [0u8; 12];
    let plaintext = b"Hello World!";

    let ciphertext = sm4_gcm::sm4_gcm_encrypt(&key, &nonce, plaintext);
    println!("Encrypted: {}", hex::encode(&ciphertext));
    let decrypted = sm4_gcm::sm4_gcm_decrypt(&key, &nonce, &ciphertext).unwrap();
    println!("Decrypted: {}", String::from_utf8_lossy(&decrypted));
}

JAVA使用 BC采用SM4/GCM/NoPadding算法加密代码示例：

public static void encryptGcmNoPadding(String key, String data, String nonce, String associatedData) throws Exception {
    Cipher cipher = Cipher.getInstance("SM4/GCM/NoPadding", BouncyCastleProvider.PROVIDER_NAME);
    Key sm4Key = new SecretKeySpec(Bytes.fromHex(key).bytes(), "SM4");
    byte[] iv = Bytes.fromHex(nonce).bytes();
    GCMParameterSpec s = new GCMParameterSpec(128, iv);
    cipher.init(Cipher.ENCRYPT_MODE, sm4Key, s);
    if (associatedData != null && associatedData.length() > 0) {
        cipher.updateAAD(Bytes.fromHex(associatedData).bytes());
    }
    byte[] aa = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
    System.out.println(Bytes.from(aa).asHex());
}

AES在线加密解密工具对比结果：
AES加密在线工具

AES解密在线工具

参考链接：
https://lib.rs/crates/sm4-gcm