Constant tobytes of Fp is in the wrong direction (#108)

src/fields/fp/mod.rs

@@ -920,7 +920,7 @@ impl ToBytesGadget for FpVar {
     fn to_bytes(&self) -> Result<Vec<UInt8<F>>, SynthesisError> {
         match self {
             Self::Constant(c) => Ok(UInt8::constant_vec(
-                c.into_bigint().to_bytes_be().as_slice(),
+                c.into_bigint().to_bytes_le().as_slice(),
             )),
             Self::Var(v) => v.to_bytes(),
         }
@@ -930,7 +930,7 @@ impl ToBytesGadget for FpVar {
     fn to_non_unique_bytes(&self) -> Result<Vec<UInt8<F>>, SynthesisError> {
         match self {
             Self::Constant(c) => Ok(UInt8::constant_vec(
-                c.into_bigint().to_bytes_be().as_slice(),
+                c.into_bigint().to_bytes_le().as_slice(),
             )),
             Self::Var(v) => v.to_non_unique_bytes(),
         }

src/pairing/bls12/mod.rs

@@ -8,7 +8,7 @@ use crate::{
 };
 use ark_ec::bls12::{Bls12, Bls12Parameters, TwistType};
 use ark_ff::BitIteratorBE;
-use core::marker::PhantomData;
+use ark_std::marker::PhantomData;
 
 /// Specifies the constraints for computing a pairing in a BLS12 bilinear group.
 pub struct PairingVar<P: Bls12Parameters>(PhantomData<P>);