[feat] crypto: use failure for BaseConversionError

lib/tools/crypto/Cargo.toml

@@ -16,6 +16,7 @@ path = "src/lib.rs"
 base58 = "0.1.*"
 base64 = "0.10.*"
 bincode = "1.0.*"
+failure = "0.1.5"
 rand = "0.5.*"
 rust-crypto-wasm = "0.3.1"
 serde = "1.0.*"

lib/tools/crypto/src/keys/mod.rs

@@ -74,12 +74,15 @@ pub trait GetKeysAlgo: Clone + Debug + PartialEq + Eq {
 }
 
 /// Errors enumeration for Base58/64 strings convertion.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Fail)]
 pub enum BaseConvertionError {
+    #[fail(display = "Data have invalid key length.")]
     /// Data have invalid key length (found, expected).
     InvalidKeyLendth(usize, usize),
+    #[fail(display = "Invalid character.")]
     /// Base58 have an invalid character.
     InvalidCharacter(char, usize),
+    #[fail(display = "Invalid base converter length.")]
     /// Base58 have invalid lendth
     InvalidBaseConverterLength(),
 }

lib/tools/crypto/src/lib.rs

@@ -29,6 +29,8 @@
 )]
 #![allow(non_camel_case_types)]
 
+#[macro_use]
+extern crate failure;
 #[macro_use]
 extern crate serde_derive;