1 files changed, 69 insertions, 0 deletions
diff --git a/vendor/elliptic-curve/src/point.rs b/vendor/elliptic-curve/src/point.rs
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+++ b/vendor/elliptic-curve/src/point.rs
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+//! Traits for elliptic curve points.
+
+#[cfg(feature = "arithmetic")]
+mod non_identity;
+
+#[cfg(feature = "arithmetic")]
+pub use {self::non_identity::NonIdentity, crate::CurveArithmetic};
+
+use crate::{Curve, FieldBytes};
+use subtle::{Choice, CtOption};
+
+/// Affine point type for a given curve with a [`CurveArithmetic`]
+/// implementation.
+#[cfg(feature = "arithmetic")]
+pub type AffinePoint<C> = <C as CurveArithmetic>::AffinePoint;
+
+/// Projective point type for a given curve with a [`CurveArithmetic`]
+/// implementation.
+#[cfg(feature = "arithmetic")]
+pub type ProjectivePoint<C> = <C as CurveArithmetic>::ProjectivePoint;
+
+/// Access to the affine coordinates of an elliptic curve point.
+// TODO: use zkcrypto/group#30 coordinate API when available
+pub trait AffineCoordinates {
+    /// Field element representation.
+    type FieldRepr: AsRef<[u8]>;
+
+    /// Get the affine x-coordinate as a serialized field element.
+    fn x(&self) -> Self::FieldRepr;
+
+    /// Is the affine y-coordinate odd?
+    fn y_is_odd(&self) -> Choice;
+}
+
+/// Double a point (i.e. add it to itself)
+pub trait Double {
+    /// Double this point.
+    fn double(&self) -> Self;
+}
+
+/// Decompress an elliptic curve point.
+///
+/// Point decompression recovers an original curve point from its x-coordinate
+/// and a boolean flag indicating whether or not the y-coordinate is odd.
+pub trait DecompressPoint<C: Curve>: Sized {
+    /// Attempt to decompress an elliptic curve point.
+    fn decompress(x: &FieldBytes<C>, y_is_odd: Choice) -> CtOption<Self>;
+}
+
+/// Decompact an elliptic curve point from an x-coordinate.
+///
+/// Decompaction relies on properties of specially-generated keys but provides
+/// a more compact representation than standard point compression.
+pub trait DecompactPoint<C: Curve>: Sized {
+    /// Attempt to decompact an elliptic curve point
+    fn decompact(x: &FieldBytes<C>) -> CtOption<Self>;
+}
+
+/// Point compression settings.
+pub trait PointCompression {
+    /// Should point compression be applied by default?
+    const COMPRESS_POINTS: bool;
+}
+
+/// Point compaction settings.
+pub trait PointCompaction {
+    /// Should point compaction be applied by default?
+    const COMPACT_POINTS: bool;
+}