diff --git a/des/src/block/block64.rs b/des/src/block/block64.rs
index 0bb784f..29edb7c 100644
--- a/des/src/block/block64.rs
+++ b/des/src/block/block64.rs
@@ -22,18 +22,18 @@ impl Block64 {
         Self(u64::from_be_bytes(bytes))
     }
 
-    #[inline]
-    #[must_use]
-    pub const fn to_le_bytes(self) -> [u8; 8] {
-        self.0.to_le_bytes()
-    }
-
     #[inline]
     #[must_use]
     pub const fn to_be_bytes(self) -> [u8; 8] {
         self.0.to_be_bytes()
     }
 
+    #[inline]
+    #[must_use]
+    pub const fn to_le_bytes(self) -> [u8; 8] {
+        self.0.to_le_bytes()
+    }
+
     #[inline]
     #[must_use]
     pub fn split_lr(self) -> LR {
@@ -41,6 +41,12 @@ impl Block64 {
     }
 }
 
+impl From<[u8; 8]> for Block64 {
+    fn from(bytes: [u8; 8]) -> Self {
+        Self::from_be_bytes(bytes)
+    }
+}
+
 impl From<u64> for Block64 {
     fn from(value: u64) -> Self {
         Self::new(value)
@@ -65,12 +71,12 @@ impl From<&Block64> for LR {
 
 impl From<Block64> for Vec<u8> {
     fn from(value: Block64) -> Self {
-        value.0.to_le_bytes().to_vec()
+        value.0.to_be_bytes().to_vec()
     }
 }
 
 impl From<&Block64> for Vec<u8> {
     fn from(value: &Block64) -> Self {
-        value.0.to_le_bytes().to_vec()
+        value.0.to_be_bytes().to_vec()
     }
 }
diff --git a/des/src/constants.rs b/des/src/constants.rs
index ef9d17c..4a69bc3 100644
--- a/des/src/constants.rs
+++ b/des/src/constants.rs
@@ -95,7 +95,7 @@ pub const S_BOXES: [[[u8; 16]; 4]; 8] = [
     ],
     // S8
     [
-        [13, 2, 8, 4, 6, 15, 11, 1, 19, 9, 3, 14, 5, 0, 12, 7],
+        [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
         [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
         [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
         [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11],
diff --git a/des/src/des.rs b/des/src/des.rs
index e191cf8..fb7745b 100644
--- a/des/src/des.rs
+++ b/des/src/des.rs
@@ -58,6 +58,7 @@ where
     for subkey in subkeys {
         feistel(&mut lr, subkey);
     }
+    lr.swap();
     lr.into()
 }
 
diff --git a/des/src/key/des_key.rs b/des/src/key/des_key.rs
index f849fdf..aa68dc1 100644
--- a/des/src/key/des_key.rs
+++ b/des/src/key/des_key.rs
@@ -44,7 +44,7 @@ impl AsRef<[u8]> for Key {
 
 impl From<u64> for Key {
     fn from(key: u64) -> Self {
-        Self(key.to_le_bytes())
+        Self(key.to_be_bytes())
     }
 }
 
diff --git a/des/tests/des.rs b/des/tests/des.rs
index 996582b..7f2789b 100644
--- a/des/tests/des.rs
+++ b/des/tests/des.rs
@@ -116,7 +116,7 @@ fn encrypt_decrypt_roundtrip(
 ) {
     let des = assert_ok!(Des::new(key), "Valid DES key");
 
-    let ciphertext = assert_ok!(des.encrypt(&plaintext.to_le_bytes()));
+    let ciphertext = assert_ok!(des.encrypt(&plaintext.to_be_bytes()));
     let dectrypted = assert_ok!(des.decrypt(&ciphertext));
     let re_ciphertext = assert_ok!(des.encrypt(&dectrypted));
 
@@ -126,7 +126,7 @@ fn encrypt_decrypt_roundtrip(
 
     assert_eq!(
         ciphertext_u64, expected_ciphertext,
-        "Encyption failed. Expected 0x{expected_ciphertext:016X}, got 0x{decrypted_u64:016X}"
+        "Encyption failed. Expected 0x{expected_ciphertext:016X}, got 0x{ciphertext_u64:016X}"
     );
     assert_eq!(
         decrypted_u64, plaintext,