Hex Strings

lorawan-encoding/Cargo.toml

@@ -13,6 +13,7 @@ readme = "README.md"
 aes = { version = "0.8", optional = true }
 cmac = { version = "0.7", optional = true }
 generic-array = "0"
+hex = { version = "0", default-features = false }
 defmt = { version = "0.3", optional = true }
 serde = { version = "1", default-features = false, features = ["derive"], optional = true}
 

lorawan-encoding/src/extra/mod.rs

@@ -9,5 +9,3 @@
 pub extern crate std;
 
 pub mod hasher;
-#[cfg(feature = "with-to-string")]
-pub mod to_string;

lorawan-encoding/src/keys.rs

@@ -31,22 +31,69 @@ macro_rules! lorawan_key {
             }
         }
 
-        };
-    }
+        impl AsRef<[u8]> for $type {
+            fn as_ref(&self) -> &[u8] {
+                &self.0 .0
+            }
+        }
+    };
+}
 
 lorawan_key!(
-    /// AppKey should be entered in MSB format. For example, if your LNS provides a AppKey of
-    /// `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`, you should enter it as `AppKey([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF])`.
+    /// You can construct AppKey from a hex-encoded MSB string or bytes in MSB format.
+    ///
+    /// Typically, a LNS will provide it in a string format such as: `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`.
+    ///
+    /// To create from a string:
+    /// ```
+    /// use lorawan::keys::AppKey;
+    /// use core::str::FromStr;
+    ///let appkey = AppKey::from_str("00112233445566778899aabbccddeeff").unwrap();
+    /// ```
+    ///
+    /// To create from a byte array, you should enter the bytes in MSB format:
+    /// ```
+    /// use lorawan::keys::AppKey;
+    /// let appkey = AppKey::from([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF]);
+    /// ```
     pub struct AppKey(AES128);
 );
 lorawan_key!(
-    /// NwkSKey should be entered in MSB format. For example, if your LNS provides a NwkSKey of
-    /// `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`, you should enter it as `NwkSKey([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF])`.
+    /// You can construct NewSKey from a hex-encoded MSB string or bytes in MSB format.
+    ///
+    /// Typically, a LNS will provide a hex-encoded MSB string such as: `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`.
+    ///
+    /// To create from a string:
+    /// ```
+    /// use lorawan::keys::NewSKey;
+    /// use core::str::FromStr;
+    /// let newskey = NewSKey::from_str("00112233445566778899aabbccddeeff").unwrap();
+    /// ```
+    ///
+    /// To create from a byte array, you should enter the bytes in MSB format:
+    /// ```
+    /// use lorawan::keys::NewSKey;
+    /// let newskey = NewSKey::from([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF]);
+    /// ```
     pub struct NewSKey(AES128);
 );
 lorawan_key!(
-    /// AppSKey should be entered in MSB format. For example, if your LNS provides a AppSKey of
-    /// `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`, you should enter it as `AppSKey([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF])`.
+    /// You can construct AppSKey from a hex-encoded MSB string or bytes in MSB format.
+    ///
+    /// Typically, a LNS will provide a hex-encoded MSB string format such as: `00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF`.
+    ///
+    /// To create from a string:
+    /// ```
+    /// use lorawan::keys::AppSKey;
+    /// use core::str::FromStr;
+    /// let appskey = AppSKey::from_str("00112233445566778899aabbccddeeff").unwrap();
+    /// ```
+    ///
+    /// To create from a byte array, you should enter the bytes in MSB format:
+    /// ```
+    /// use lorawan::keys::AppSKey;
+    /// let appskey = AppSKey::from([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF]);
+    /// ```
     pub struct AppSKey(AES128);
 );
 
@@ -72,17 +119,51 @@ macro_rules! lorawan_eui {
                 key.0
             }
         }
+
+        impl AsRef<[u8]> for $type {
+            fn as_ref(&self) -> &[u8] {
+                &self.0.as_ref()
+            }
+        }
     };
 }
 
 lorawan_eui!(
-    /// DevEui should be entered in LSB format. For example, if your LNS provides a DevEui of
-    /// `00:11:22:33:44:55:66:77`, you should enter it as `DevEui([0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00])`.
+    /// You can construct DevEui from a hex-encoded MSB string or bytes in LSB format.
+    ///
+    /// Typically, a LNS will provide a hex-encoded MSB string such as: `00:11:22:33:44:55:66:77`.
+    ///
+    /// To create from a string:
+    /// ```
+    /// use lorawan::keys::DevEui;
+    /// use core::str::FromStr;
+    /// let dev_eui = DevEui::from_str("0011223344556677").unwrap();
+    /// ```
+    ///
+    /// To create from a byte array, you should enter the bytes in LSB format:
+    /// ```
+    /// use lorawan::keys::DevEui;
+    /// let dev_eui = DevEui::from([0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00]);
+    /// ```
     pub struct DevEui(EUI64<[u8; 8]>);
 );
 lorawan_eui!(
-    /// AppEui should be entered in LSB format. For example, if your LNS provides a AppEui of
-    /// `00:11:22:33:44:55:66:77`, you should enter it as `AppEui([0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00])`.
+    /// You can construct AppEui from a hex-encoded MSB string or bytes in LSB format.
+    ///
+    /// Typically, a LNS will provide a hex-encoded MSB string such as: `00:11:22:33:44:55:66:77`.
+    ///
+    /// To create from a string:
+    /// ```
+    /// use lorawan::keys::AppEui;
+    /// use core::str::FromStr;
+    /// let app_eui = AppEui::from_str("0011223344556677").unwrap();
+    /// ```
+    ///
+    /// To create from a byte array, you should enter the bytes in LSB format:
+    /// ```
+    /// use lorawan::keys::AppEui;
+    /// let app_eui = AppEui::from([0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00]);
+    /// ```
     pub struct AppEui(EUI64<[u8; 8]>);
 );
 

lorawan-encoding/src/lib.rs

@@ -17,6 +17,7 @@ pub mod maccommandcreator;
 pub mod maccommands;
 pub mod packet_length;
 pub mod parser;
+pub mod string;
 
 #[cfg(feature = "full")]
 pub mod extra;

lorawan-encoding/src/string.rs

@@ -0,0 +1,180 @@
+use crate::keys::*;
+use crate::parser::*;
+
+#[cfg(feature = "with-to-string")]
+pub extern crate std;
+
+pub use hex::FromHexError;
+
+macro_rules! fixed_len_struct_impl_to_string_msb {
+    (
+        $type:ident,$size:expr;
+    ) => {
+        impl core::str::FromStr for $type {
+            type Err = FromHexError;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                let mut res = [0; $size];
+                hex::decode_to_slice(s.as_bytes(), &mut res)?;
+                Ok(Self::from(res))
+            }
+        }
+
+        #[cfg(feature = "with-to-string")]
+        impl std::string::ToString for $type {
+            fn to_string(&self) -> std::string::String {
+                let mut res = std::string::String::with_capacity($size * 2);
+                res.extend(std::iter::repeat('-').take($size * 2));
+                let slice = unsafe { &mut res.as_bytes_mut() };
+                hex::encode_to_slice(self.as_ref(), slice).unwrap();
+                res
+            }
+        }
+    };
+    (
+        $type:ident[$size:expr];
+    ) => {
+        impl core::str::FromStr for $type<[u8; $size]> {
+            type Err = FromHexError;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                let mut res = [0; $size];
+                hex::decode_to_slice(s.as_bytes(), &mut res)?;
+                Ok(Self::from(res))
+            }
+        }
+
+        #[cfg(feature = "with-to-string")]
+        impl<T: AsRef<[u8]>> std::string::ToString for $type<T> {
+            fn to_string(&self) -> std::string::String {
+                let mut res = std::string::String::with_capacity($size * 2);
+                res.extend(std::iter::repeat('-').take($size * 2));
+                let slice = unsafe { &mut res.as_bytes_mut() };
+                hex::encode_to_slice(self.as_ref(), slice).unwrap();
+                res
+            }
+        }
+    };
+}
+
+macro_rules! fixed_len_struct_impl_string_lsb {
+    (
+        $type:ident,$size:expr;
+    ) => {
+        impl core::str::FromStr for $type {
+            type Err = FromHexError;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                let mut res = [0; $size];
+                hex::decode_to_slice(s.as_bytes(), &mut res)?;
+                res.reverse();
+                Ok(Self::from(res))
+            }
+        }
+
+        #[cfg(feature = "with-to-string")]
+        impl std::string::ToString for $type {
+            fn to_string(&self) -> std::string::String {
+                let mut res = std::string::String::with_capacity($size * 2);
+                res.extend(std::iter::repeat('0').take($size * 2));
+                let slice = unsafe { &mut res.as_bytes_mut() };
+                self.as_ref().iter().rev().enumerate().for_each(|(i, b)| {
+                    hex::encode_to_slice(&[*b], &mut slice[i * 2..i * 2 + 2]).unwrap();
+                });
+                res
+            }
+        }
+    };
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    EUI64[8];
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    DevNonce[2];
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    AppNonce[3];
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    DevAddr[4];
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    NwkAddr[3];
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    AppKey, 16;
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    NewSKey, 16;
+}
+
+fixed_len_struct_impl_to_string_msb! {
+    AppSKey, 16;
+}
+
+fixed_len_struct_impl_string_lsb! {
+    DevEui, 8;
+}
+
+fixed_len_struct_impl_string_lsb! {
+    AppEui, 8;
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::extra::std::string::ToString;
+    use core::str::FromStr;
+
+    #[test]
+    fn test_appskey_to_string() {
+        let appskey = AppSKey::from([
+            0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfd, 0xb9, 0x75, 0x31, 0x24, 0x68,
+            0xac, 0xed,
+        ]);
+        assert_eq!(appskey.to_string(), "0123456789abcdeffdb975312468aced");
+    }
+
+    #[test]
+    fn test_appskey_from_str() {
+        let appskey = AppSKey::from_str("00112233445566778899aabbccddeeff").unwrap();
+        assert_eq!(
+            appskey,
+            AppSKey::from([
+                0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD,
+                0xEE, 0xFF
+            ])
+        );
+    }
+
+    #[test]
+    fn test_deveui_to_string() {
+        let deveui = DevEui::from([0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12]);
+        assert_eq!(deveui.to_string(), "123456789abcdef0");
+    }
+
+    #[test]
+    fn test_deveui_from_str() {
+        let deveui = DevEui::from_str("123456789abcdef0").unwrap();
+        assert_eq!(deveui, DevEui::from([0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12]));
+    }
+
+    #[test]
+    fn test_deveui_from_small_str() {
+        let result = DevEui::from_str("123456789abcd");
+        assert_eq!(result, Err(FromHexError::OddLength));
+    }
+
+    #[test]
+    fn test_deveui_from_large_str() {
+        let result = DevEui::from_str("123456789abcdef000");
+        assert_eq!(result, Err(FromHexError::InvalidStringLength));
+    }
+}