chore: remove some dead code (#76)

src/key.rs

@@ -16,8 +16,6 @@ use blstrs::{G1Affine, G1Projective, G2Affine, Scalar};
 #[cfg(feature = "blst")]
 use group::prime::PrimeCurveAffine;
 
-pub(crate) struct ScalarRepr(<Scalar as PrimeFieldBits>::ReprBits);
-
 use crate::error::Error;
 use crate::signature::*;
 
@@ -52,18 +50,6 @@ impl From<PrivateKey> for Scalar {
     }
 }
 
-impl From<PrivateKey> for ScalarRepr {
-    fn from(val: PrivateKey) -> Self {
-        ScalarRepr(val.0.to_le_bits().into_inner())
-    }
-}
-
-impl<'a> From<&'a PrivateKey> for ScalarRepr {
-    fn from(val: &'a PrivateKey) -> Self {
-        (*val).into()
-    }
-}
-
 pub trait Serialize: ::std::fmt::Debug + Sized {
     /// Writes the key to the given writer.
     fn write_bytes(&self, dest: &mut impl io::Write) -> io::Result<()>;