Serialization for cryptonums.

src/cryptonum/traits.rs

@@ -1,5 +1,12 @@
-
 pub trait CryptoNum {
+    /// Simultaneously compute the quotient and remainder of this number and
+    /// the given divisor.
     fn divmod(&self, a: &Self, q: &mut Self, r: &mut Self);
+    /// Convert a number to a series of bytes, in standard order (most to
+    /// least significant)
+    fn to_bytes(&self) -> Vec<u8>;
+    /// Convert a series of bytes into the number. The size of the given slice
+    /// must be greater than or equal to the size of the number, and must be
+    /// a multiple of 8 bytes long. Unused bytes should be ignored.
+    fn from_bytes(&[u8]) -> Self;
 }
-