Rename the coins folder to networks (#583)

* Rename the coins folder to networks

Ethereum isn't a coin. It's a network.

Resolves #357.

* More renames of coins -> networks in orchestration

* Correct paths in tests/

* cargo fmt

networks/monero/ringct/bulletproofs/src/scalar_vector.rs

@@ -0,0 +1,138 @@
+use core::{
+  borrow::Borrow,
+  ops::{Index, IndexMut, Add, Sub, Mul},
+};
+use std_shims::{vec, vec::Vec};
+
+use zeroize::{Zeroize, ZeroizeOnDrop};
+
+use curve25519_dalek::{scalar::Scalar, edwards::EdwardsPoint};
+
+use crate::core::multiexp;
+
+#[derive(Clone, PartialEq, Eq, Debug, Zeroize, ZeroizeOnDrop)]
+pub(crate) struct ScalarVector(pub(crate) Vec<Scalar>);
+
+impl Index<usize> for ScalarVector {
+  type Output = Scalar;
+  fn index(&self, index: usize) -> &Scalar {
+    &self.0[index]
+  }
+}
+impl IndexMut<usize> for ScalarVector {
+  fn index_mut(&mut self, index: usize) -> &mut Scalar {
+    &mut self.0[index]
+  }
+}
+
+impl<S: Borrow<Scalar>> Add<S> for ScalarVector {
+  type Output = ScalarVector;
+  fn add(mut self, scalar: S) -> ScalarVector {
+    for s in &mut self.0 {
+      *s += scalar.borrow();
+    }
+    self
+  }
+}
+impl<S: Borrow<Scalar>> Sub<S> for ScalarVector {
+  type Output = ScalarVector;
+  fn sub(mut self, scalar: S) -> ScalarVector {
+    for s in &mut self.0 {
+      *s -= scalar.borrow();
+    }
+    self
+  }
+}
+impl<S: Borrow<Scalar>> Mul<S> for ScalarVector {
+  type Output = ScalarVector;
+  fn mul(mut self, scalar: S) -> ScalarVector {
+    for s in &mut self.0 {
+      *s *= scalar.borrow();
+    }
+    self
+  }
+}
+
+impl Add<&ScalarVector> for ScalarVector {
+  type Output = ScalarVector;
+  fn add(mut self, other: &ScalarVector) -> ScalarVector {
+    debug_assert_eq!(self.len(), other.len());
+    for (s, o) in self.0.iter_mut().zip(other.0.iter()) {
+      *s += o;
+    }
+    self
+  }
+}
+impl Sub<&ScalarVector> for ScalarVector {
+  type Output = ScalarVector;
+  fn sub(mut self, other: &ScalarVector) -> ScalarVector {
+    debug_assert_eq!(self.len(), other.len());
+    for (s, o) in self.0.iter_mut().zip(other.0.iter()) {
+      *s -= o;
+    }
+    self
+  }
+}
+impl Mul<&ScalarVector> for ScalarVector {
+  type Output = ScalarVector;
+  fn mul(mut self, other: &ScalarVector) -> ScalarVector {
+    debug_assert_eq!(self.len(), other.len());
+    for (s, o) in self.0.iter_mut().zip(other.0.iter()) {
+      *s *= o;
+    }
+    self
+  }
+}
+
+impl Mul<&[EdwardsPoint]> for &ScalarVector {
+  type Output = EdwardsPoint;
+  fn mul(self, b: &[EdwardsPoint]) -> EdwardsPoint {
+    debug_assert_eq!(self.len(), b.len());
+    let mut multiexp_args = self.0.iter().copied().zip(b.iter().copied()).collect::<Vec<_>>();
+    let res = multiexp(&multiexp_args);
+    multiexp_args.zeroize();
+    res
+  }
+}
+
+impl ScalarVector {
+  pub(crate) fn new(len: usize) -> Self {
+    ScalarVector(vec![Scalar::ZERO; len])
+  }
+
+  pub(crate) fn powers(x: Scalar, len: usize) -> Self {
+    debug_assert!(len != 0);
+
+    let mut res = Vec::with_capacity(len);
+    res.push(Scalar::ONE);
+    res.push(x);
+    for i in 2 .. len {
+      res.push(res[i - 1] * x);
+    }
+    res.truncate(len);
+    ScalarVector(res)
+  }
+
+  pub(crate) fn len(&self) -> usize {
+    self.0.len()
+  }
+
+  pub(crate) fn sum(mut self) -> Scalar {
+    self.0.drain(..).sum()
+  }
+
+  pub(crate) fn inner_product(self, vector: &Self) -> Scalar {
+    (self * vector).sum()
+  }
+
+  pub(crate) fn weighted_inner_product(self, vector: &Self, y: &Self) -> Scalar {
+    (self * vector * y).sum()
+  }
+
+  pub(crate) fn split(mut self) -> (Self, Self) {
+    debug_assert!(self.len() > 1);
+    let r = self.0.split_off(self.0.len() / 2);
+    debug_assert_eq!(self.len(), r.len());
+    (self, ScalarVector(r))
+  }
+}