Add crate for working with short Weierstrass elliptic curves

crypto/short-weierstrass/src/lib.rs

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+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![doc = include_str!("../README.md")]
+#![no_std]
+#![allow(non_snake_case)]
+
+use core::fmt::Debug;
+
+use zeroize::Zeroize;
+use group::ff::PrimeField;
+
+mod affine;
+pub use affine::Affine;
+mod projective;
+pub use projective::Projective;
+
+/// An elliptic curve represented in short Weierstrass form, with equation `y^2 = x^3 + A x + B`.
+pub trait ShortWeierstrass: 'static + Sized + Debug {
+  /// The field the elliptic curve is defined over.
+  type FieldElement: Zeroize + PrimeField;
+  /// The constant `A` from the curve equation.
+  const A: Self::FieldElement;
+  /// The constant `B` from the curve equation.
+  const B: Self::FieldElement;
+  /// A generator of this elliptic curve.
+  const GENERATOR: Affine<Self>;
+  /// The scalar type.
+  ///
+  /// This may be omitted by specifying `()`.
+  type Scalar;
+}