diff --git a/dlqrcode/src/lib.rs b/dlqrcode/src/lib.rs
new file mode 100644
index 0000000..fdcad91
--- /dev/null
+++ b/dlqrcode/src/lib.rs
@@ -0,0 +1,398 @@
+extern crate base64_url;
+extern crate hex;
+
+use std::fmt;
+use std::slice;
+use std::time::Instant;
+use std::time::SystemTime;
+
+use sha2::{Digest, Sha256};
+
+use aes::Aes256;
+use block_modes::block_padding::Pkcs7;
+use block_modes::{BlockMode, Cbc};
+use totp_rs::{Algorithm, TOTP};
+
+type Aes256Cbc = Cbc<Aes256, Pkcs7>;
+
+const TOTP_STEP: u64 = 5;
+const TOTP_SKEW: u8 = 3;
+static QR_FIELD_DILIMITER: &str = ":";
+
+pub struct DaliQrCode {
+    master_key: Vec<u8>,
+    iv: Vec<u8>,
+    totp_step: u64,
+    totp_skew: u8,
+    totp_seed: Vec<u8>,
+}
+
+#[derive(Debug)]
+pub struct DaliQrData {
+    pub uid: String,
+    pub cardno: String,
+    pub cardtype: String,
+    pub totp: String,
+    pub nonce: String,
+    sign: Vec<u8>,
+}
+
+impl DaliQrData {
+    #[allow(dead_code)]
+    fn new() -> Self {
+        Self {
+            uid: String::from(""),
+            cardno: String::from(""),
+            cardtype: String::from(""),
+            totp: String::from(""),
+            nonce: String::from(""),
+            sign: Vec::new(),
+        }
+    }
+
+    fn from_qrcode(qr_fields: &Vec<Vec<u8>>) -> Result<Self> {
+        if qr_fields.len() < 6 {
+            return Err(DecodeError::new("qrcode fields length must grater than 6."));
+        }
+        let sign = qr_fields[5].to_vec();
+        Ok(Self {
+            uid: String::from_utf8_lossy(&qr_fields[0].as_slice()).to_string(),
+            cardno: String::from_utf8_lossy(&qr_fields[1].as_slice()).to_string(),
+            cardtype: String::from_utf8_lossy(&qr_fields[2].as_slice()).to_string(),
+            totp: String::from_utf8_lossy(&qr_fields[3].as_slice()).to_string(),
+            nonce: String::from_utf8_lossy(&qr_fields[4].as_slice()).to_string(),
+            sign: sign,
+        })
+    }
+
+    fn update_sign(&mut self, sign: &Vec<u8>) {
+        self.sign = sign.to_vec();
+    }
+
+    fn to_qrdata(&self) -> String {
+        let v = vec![
+            String::from(&self.uid),
+            String::from(&self.cardno),
+            String::from(&self.cardtype),
+            String::from(&self.totp),
+            String::from(&self.nonce),
+        ];
+        v.join(QR_FIELD_DILIMITER)
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct DecodeError {
+    message: String,
+}
+
+impl fmt::Display for DecodeError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Decode Qrcode error {}", self.message)
+    }
+}
+
+impl DecodeError {
+    fn new(message: &str) -> Self {
+        Self {
+            message: String::from(message),
+        }
+    }
+}
+
+type Result<T> = std::result::Result<T, DecodeError>;
+
+const KEY_LEN: usize = 32;
+impl DaliQrCode {
+    pub fn new(
+        key: [u8; KEY_LEN],
+        iv: Option<[u8; 16]>,
+        step: Option<u64>,
+        skew: Option<u8>,
+        seed: Option<Vec<u8>>,
+    ) -> Result<Self> {
+        let key = key.to_vec();
+        if key.len() != KEY_LEN {
+            return Err(DecodeError::new(&format!(
+                "key size must be {} bytes",
+                KEY_LEN
+            )));
+        }
+        let iv = if let Some(v) = iv {
+            v.to_vec()
+        } else {
+            hex::decode("55b6f5b3287c535f8274b99354676d0e").unwrap()
+        };
+
+        if iv.len() != 16 {
+            return Err(DecodeError::new("IV size must be 16 bytes"));
+        }
+
+        let step = if let Some(s) = step { s } else { TOTP_STEP };
+
+        let skew = if let Some(s) = skew { s } else { TOTP_SKEW };
+
+        let seed = if let Some(s) = seed {
+            s
+        } else {
+            hex::decode("125ea2f97689988b6501").unwrap()
+        };
+
+        Ok(Self {
+            master_key: key,
+            iv: iv,
+            totp_seed: seed,
+            totp_skew: skew,
+            totp_step: step,
+        })
+    }
+
+    pub fn decode(&self, qrcode: *const u8, len: usize, secs_offset: i32) -> Result<DaliQrData> {
+        let qrcode = match self.decode_qrcode(qrcode, len) {
+            Ok(q) => q,
+            Err(e) => return Err(e),
+        };
+        let mut qr_fields: Vec<Vec<u8>> = Vec::new();
+        let v = QR_FIELD_DILIMITER.as_bytes()[0];
+        let mut j = 0;
+        for i in 0..qrcode.len() {
+            if qrcode[i] == v {
+                if i > j {
+                    let mut s = Vec::new();
+                    s.extend_from_slice(&qrcode[j..i]);
+                    qr_fields.push(s);
+                }
+                j = i + 1;
+            }
+        }
+        if j < qrcode.len() {
+            let mut s = Vec::new();
+            s.extend_from_slice(&qrcode[j..]);
+            qr_fields.push(s);
+        }
+        let qr_data = match DaliQrData::from_qrcode(&qr_fields) {
+            Ok(d) => d,
+            Err(e) => return Err(e),
+        };
+
+        match self.check_qrcode_sign(&qr_data) {
+            Ok(result) if !result => return Err(DecodeError::new("invalidate qrcode")),
+            Ok(_) => (),
+            Err(e) => return Err(e),
+        }
+
+        let totp = self.new_totp();
+        let time = self.totp_time(secs_offset);
+        if totp.check(&qr_data.totp, time) {
+            Ok(qr_data)
+        } else {
+            Err(DecodeError::new("qrcode totp error"))
+        }
+    }
+
+    fn check_qrcode_sign(&self, qr_data: &DaliQrData) -> Result<bool> {
+        let sign = self.calc_sign(qr_data);
+        if qr_data.sign == sign {
+            Ok(true)
+        } else {
+            Ok(false)
+        }
+    }
+
+    fn decode_qrcode(
+        &self,
+        qrcode: *const u8,
+        len: usize,
+    ) -> std::result::Result<Vec<u8>, DecodeError> {
+        let cipher = match Aes256Cbc::new_var(&self.master_key, &self.iv) {
+            Ok(c) => c,
+            Err(e) => return Err(DecodeError::new(&format!("aes key error {:?}", e))),
+        };
+
+        let qrcode = unsafe {
+            let s = slice::from_raw_parts(qrcode, len);
+            // println!("qr input : {}", String::from_utf8_lossy(s));
+            if let Ok(code) = base64_url::decode(s) {
+                code
+            } else {
+                return Err(DecodeError::new("data base64 decode error"));
+            }
+        };
+
+        if qrcode.len() % 16 != 0 {
+            return Err(DecodeError::new("Input data length error"));
+        }
+
+        match cipher.decrypt_vec(&qrcode) {
+            Ok(data) => Ok(data),
+            Err(e) => Err(DecodeError::new(&format!("block error {:?}", e))),
+        }
+    }
+
+    fn totp_time(&self, secs_offset: i32) -> u64 {
+        let time = SystemTime::now()
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .unwrap()
+            .as_secs();
+        if secs_offset > 0 {
+            time + (secs_offset as u64)
+        } else {
+            time - (secs_offset as u64)
+        }
+    }
+
+    fn new_totp(&self) -> TOTP<Vec<u8>> {
+        let seed = self.totp_seed.clone();
+        TOTP::new(Algorithm::SHA1, 8, self.totp_skew, self.totp_step, seed)
+    }
+
+    fn encode_qrcode(&self, qr_data: &DaliQrData) -> Result<String> {
+        let plain_text = qr_data.to_qrdata();
+        let cipher = match Aes256Cbc::new_var(&self.master_key, &self.iv) {
+            Ok(c) => c,
+            Err(e) => return Err(DecodeError::new(&format!("aes key error {:?}", e))),
+        };
+        let mut buffer = Vec::new();
+        buffer.extend_from_slice(&plain_text.as_bytes());
+        buffer.push(QR_FIELD_DILIMITER.as_bytes()[0]);
+        buffer.extend_from_slice(qr_data.sign.as_slice());
+        let crypt_data = cipher.encrypt_vec(buffer.as_slice());
+        Ok(base64_url::encode(crypt_data.as_slice()))
+    }
+
+    fn calc_sign(&self, qr_data: &DaliQrData) -> Vec<u8> {
+        let mut hasher = Sha256::new();
+        hasher.update("{dlsmk_}".as_bytes());
+        hasher.update(qr_data.uid.as_bytes());
+        let salt = hasher.finalize();
+        let mut hasher = Sha256::new();
+        hasher.update(qr_data.to_qrdata().as_bytes());
+        hasher.update(salt);
+        hasher.finalize().to_vec()
+    }
+
+    pub fn encode(&self, qr_data: &mut DaliQrData, secs_offset: i32) -> Result<String> {
+        if qr_data.nonce.len() == 0 {
+            qr_data.nonce = format!("{:02}", Instant::now().elapsed().as_secs() % 100);
+        }
+        if qr_data.totp.len() == 0 {
+            let totp = self.new_totp();
+            let time = self.totp_time(secs_offset);
+            qr_data.totp = totp.generate(time);
+        }
+        let sign = self.calc_sign(qr_data);
+        qr_data.update_sign(&sign);
+        self.encode_qrcode(qr_data)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use base64::decode;
+    use std::convert::TryInto;
+    const KEYLEN: usize = 32;
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+
+    #[test]
+    fn aes_test() {
+        let mut key = [0u8; KEYLEN];
+        let s = decode("Vbb1syh8U1+CdLmTVGdtDiVvKBQ81n4GmgBEO/ohSbU=").unwrap();
+        key.clone_from_slice(&s.as_slice()[..KEYLEN]);
+
+        let iv: [u8; 16] = {
+            let s = hex::decode("55b6f5b3287c535f8274b99354676d0e").unwrap();
+            s.into_boxed_slice().as_ref().try_into().unwrap()
+        };
+
+        let aes_key = Aes256Cbc::new_var(&key, &iv).unwrap();
+        let plaintext = String::from("hello ldldldf ldfldl dslfasdamf sdmfdfdf");
+
+        let mut buffer = Vec::new();
+        buffer.extend_from_slice(plaintext.as_bytes());
+        println!(
+            "plain len : {} , buffer len : {}",
+            plaintext.len(),
+            buffer.len()
+        );
+        let cipher_data = aes_key.encrypt_vec(&buffer);
+
+        println!(
+            "cipher len : {}, last {}",
+            cipher_data.len(),
+            cipher_data[cipher_data.len() - 1] as u32
+        );
+
+        let aes_key = Aes256Cbc::new_var(&key, &iv).unwrap();
+        let _ = aes_key.decrypt_vec(&cipher_data);
+    }
+
+    fn get_key() -> ([u8; KEYLEN], [u8; 16]) {
+        let mut key = [0u8; KEYLEN];
+        let s = decode("Vbb1syh8U1+CdLmTVGdtDiVvKBQ81n4GmgBEO/ohSbU=").unwrap();
+        key.clone_from_slice(&s.as_slice()[..KEYLEN]);
+
+        let iv: [u8; 16] = {
+            let s = hex::decode("55b6f5b3287c535f8274b99354676d0e").unwrap();
+            s.into_boxed_slice().as_ref().try_into().unwrap()
+        };
+        (key, iv)
+    }
+
+    #[test]
+    fn check_qrcode_encode() {
+        let expect_qrcode = String::from("6lHyFX_vg5U2hymn8OsdNUD7dT0-sCmEQkKrm9cnzHlku6-FYxuL6nP5YR2Fve8Sfj-Asd-3dfQUkaiqqbfQWO8B_811B3uhHmGm9IjlpLicz_c1H1_ORb9tJl-IhMKu");
+        // let buffer = base64_url::decode(expect_qrcode.as_bytes()).unwrap();
+
+        // println!("encrypt buffer <{}>", buffer.len());
+        // println!("decode b64<{}>", hex::encode(buffer.clone()));
+        // let aes_key = Aes256Cbc::new_var(&key, &iv).unwrap();
+        // let data = aes_key.decrypt_vec(&buffer).unwrap();
+        // println!("data : {}", String::from_utf8_lossy(data.as_slice()));
+
+        let (key, iv) = get_key();
+
+        let mut qr_data = DaliQrData::new();
+        qr_data.uid = String::from("0a5de6ce985d43989b7ebe64ad8eb9c3");
+        qr_data.cardno = String::from("00001252");
+        qr_data.cardtype = String::from("80");
+        qr_data.nonce = String::from("ac");
+        qr_data.totp = String::from("50053019");
+
+        let dali_qrcode = DaliQrCode::new(key, Some(iv), None, None, None).unwrap();
+
+        match dali_qrcode.encode(&mut qr_data, 0) {
+            Ok(qrcode) => {
+                assert_eq!(qrcode, expect_qrcode);
+            }
+            Err(e) => {
+                panic!("error {}", e);
+            }
+        }
+    }
+
+    #[test]
+    fn check_qrcode_decode() {
+        let (key, iv) = get_key();
+        let mut qr_data = DaliQrData::new();
+        qr_data.uid = String::from("0a5de6ce985d43989b7ebe64ad8eb9c3");
+        qr_data.cardno = String::from("00001252");
+        qr_data.cardtype = String::from("80");
+
+        let dali_qrcode = DaliQrCode::new(key, Some(iv), None, None, None).unwrap();
+
+        match dali_qrcode.encode(&mut qr_data, 0) {
+            Ok(qrcode) => {
+                if let Err(e) = dali_qrcode.decode(qrcode.as_ptr(), qrcode.len(), 0) {
+                    panic!("error {}", e);
+                }
+            }
+            Err(e) => {
+                panic!("error {}", e);
+            }
+        }
+    }
+}