diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1e7caa9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+Cargo.lock
+target/
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..ef647e1
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,17 @@
+language: rust
+rust:
+  - nightly
+  - stable
+  - beta
+script:
+  - RUSTFLAGS='-F warnings' cargo build --verbose --all
+  - RUSTFLAGS='-F warnings' cargo test --verbose --all
+stages:
+  - Format
+  - Test
+jobs:
+  include:
+    - stage: Format
+      script:
+        - rustup component add rustfmt-preview
+        - cargo fmt --all -- --check
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..e69de29
diff --git a/src/lib.rs b/src/lib.rs
index b4d4517..ca23db5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,12 +19,12 @@ pub mod sm2;
 pub mod sm3;
 pub mod sm4;
 
-extern crate rand;
 extern crate byteorder;
+extern crate rand;
 
 extern crate num_bigint;
-extern crate num_traits;
 extern crate num_integer;
+extern crate num_traits;
 extern crate yasna;
 
 #[macro_use]
diff --git a/src/sm2/mod.rs b/src/sm2/mod.rs
index 9394c20..4a5c34d 100644
--- a/src/sm2/mod.rs
+++ b/src/sm2/mod.rs
@@ -15,6 +15,6 @@
 // You should have received a copy of the GNU General Public License
 // along with libsm.  If not, see <http://www.gnu.org/licenses/>.
 
-pub mod field;
 pub mod ecc;
-pub mod signature;
\ No newline at end of file
+pub mod field;
+pub mod signature;
diff --git a/src/sm3/mod.rs b/src/sm3/mod.rs
index 58e8a6a..fb721ac 100644
--- a/src/sm3/mod.rs
+++ b/src/sm3/mod.rs
@@ -16,4 +16,3 @@
 // along with libsm.  If not, see <http://www.gnu.org/licenses/>.
 
 pub mod hash;
-
diff --git a/src/sm4/cipher.rs b/src/sm4/cipher.rs
index f2bd95f..7c43ac1 100644
--- a/src/sm4/cipher.rs
+++ b/src/sm4/cipher.rs
@@ -16,38 +16,22 @@
 // along with libsm.  If not, see <http://www.gnu.org/licenses/>.
 
 static SBOX: [u8; 256] = [
-    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7,
-    0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
-    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
-    0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
-    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a,
-    0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
-    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95,
-    0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
-    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
-    0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
-    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b,
-    0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
-    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2,
-    0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
-    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
-    0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
-    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5,
-    0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
-    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55,
-    0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
-    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
-    0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
-    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f,
-    0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
-    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f,
-    0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
-    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
-    0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
-    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e,
-    0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
-    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20,
-    0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48,
+    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
+    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
+    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
+    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
+    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
+    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
+    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
+    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
+    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
+    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
+    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
+    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
+    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
+    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
+    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
+    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48,
 ];
 
 fn split(input: u32) -> [u8; 4] {
@@ -123,30 +107,22 @@ fn t_prime_trans(input: u32) -> u32 {
 
 pub struct Sm4Cipher {
     // round key
-    rk: Vec<u32>
+    rk: Vec<u32>,
 }
 
-static FK: [u32; 4] = [
-    0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
-];
+static FK: [u32; 4] = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc];
 
 static CK: [u32; 32] = [
-    0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
-    0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
-    0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
-    0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
-    0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
-    0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
-    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
-    0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
+    0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
+    0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
+    0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
+    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279,
 ];
 
 impl Sm4Cipher {
     pub fn new(key: &[u8]) -> Sm4Cipher {
         let mut k: [u32; 4] = split_block(&key);
-        let mut cipher = Sm4Cipher {
-            rk: Vec::new()
-        };
+        let mut cipher = Sm4Cipher { rk: Vec::new() };
         for i in 0..4 {
             k[i] = k[i] ^ FK[i];
         }
@@ -200,8 +176,8 @@ mod tests {
     #[test]
     fn setup_cipher() {
         let key: [u8; 16] = [
-            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
-            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10
+            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54,
+            0x32, 0x10,
         ];
         let cipher = Sm4Cipher::new(&key);
         let rk = &cipher.rk;
@@ -212,19 +188,19 @@ mod tests {
     #[test]
     fn enc_and_dec() {
         let key: [u8; 16] = [
-            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
-            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10
+            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54,
+            0x32, 0x10,
         ];
         let cipher = Sm4Cipher::new(&key);
 
         let data: [u8; 16] = [
-            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
-            0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10
+            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54,
+            0x32, 0x10,
         ];
         let ct = cipher.encrypt(&data);
         let standard_ct: [u8; 16] = [
-            0x68, 0x1e, 0xdf, 0x34, 0xd2, 0x06, 0x96, 0x5e,
-            0x86, 0xb3, 0xe9, 0x4f, 0x53, 0x6e, 0x42, 0x46
+            0x68, 0x1e, 0xdf, 0x34, 0xd2, 0x06, 0x96, 0x5e, 0x86, 0xb3, 0xe9, 0x4f, 0x53, 0x6e,
+            0x42, 0x46,
         ];
 
         // Check the example cipher text
diff --git a/src/sm4/cipher_mode.rs b/src/sm4/cipher_mode.rs
index 55faea1..657173d 100644
--- a/src/sm4/cipher_mode.rs
+++ b/src/sm4/cipher_mode.rs
@@ -55,10 +55,7 @@ fn block_add_one(a: &mut [u8]) {
 impl SM4CipherMode {
     pub fn new(key: &[u8], mode: CipherMode) -> SM4CipherMode {
         let cipher = Sm4Cipher::new(key);
-        SM4CipherMode {
-            cipher,
-            mode,
-        }
+        SM4CipherMode { cipher, mode }
     }
 
     pub fn encrypt(&self, data: &[u8], iv: &[u8]) -> Vec<u8> {
@@ -68,7 +65,7 @@ impl SM4CipherMode {
         match self.mode {
             CipherMode::Cfb => self.cfb_encrypt(data, iv),
             CipherMode::Ofb => self.ofb_encrypt(data, iv),
-            CipherMode::Ctr => self.ctr_encrypt(data, iv)
+            CipherMode::Ctr => self.ctr_encrypt(data, iv),
         }
     }
 
@@ -79,7 +76,7 @@ impl SM4CipherMode {
         match self.mode {
             CipherMode::Cfb => self.cfb_decrypt(data, iv),
             CipherMode::Ofb => self.ofb_encrypt(data, iv),
-            CipherMode::Ctr => self.ctr_encrypt(data, iv)
+            CipherMode::Ctr => self.ctr_encrypt(data, iv),
         }
     }
 
@@ -228,7 +225,6 @@ mod tests {
         test_ciphermode(CipherMode::Ofb);
     }
 
-
     fn test_ciphermode(mode: CipherMode) {
         let key = rand_block();
         let iv = rand_block();
diff --git a/src/sm4/mod.rs b/src/sm4/mod.rs
index f43ffed..d678d7d 100644
--- a/src/sm4/mod.rs
+++ b/src/sm4/mod.rs
@@ -19,4 +19,4 @@ pub mod cipher;
 pub mod cipher_mode;
 
 pub type Mode = self::cipher_mode::CipherMode;
-pub type Cipher = self::cipher_mode::SM4CipherMode;
\ No newline at end of file
+pub type Cipher = self::cipher_mode::SM4CipherMode;