1 files changed, 114 insertions, 0 deletions
diff --git a/vendor/elliptic-curve/src/sec1.rs b/vendor/elliptic-curve/src/sec1.rs
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+++ b/vendor/elliptic-curve/src/sec1.rs
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+//! Support for SEC1 elliptic curve encoding formats.
+//!
+//! <https://www.secg.org/sec1-v2.pdf>
+
+pub use sec1::point::{Coordinates, ModulusSize, Tag};
+
+use crate::{Curve, FieldBytesSize, Result, SecretKey};
+use generic_array::GenericArray;
+use subtle::CtOption;
+
+#[cfg(feature = "arithmetic")]
+use crate::{AffinePoint, CurveArithmetic, Error};
+
+/// Encoded elliptic curve point with point compression.
+pub type CompressedPoint<C> = GenericArray<u8, CompressedPointSize<C>>;
+
+/// Size of a compressed elliptic curve point.
+pub type CompressedPointSize<C> = <FieldBytesSize<C> as ModulusSize>::CompressedPointSize;
+
+/// Encoded elliptic curve point sized appropriately for a given curve.
+pub type EncodedPoint<C> = sec1::point::EncodedPoint<FieldBytesSize<C>>;
+
+/// Encoded elliptic curve point *without* point compression.
+pub type UncompressedPoint<C> = GenericArray<u8, UncompressedPointSize<C>>;
+
+/// Size of an uncompressed elliptic curve point.
+pub type UncompressedPointSize<C> = <FieldBytesSize<C> as ModulusSize>::UncompressedPointSize;
+
+/// Trait for deserializing a value from a SEC1 encoded curve point.
+///
+/// This is intended for use with the `AffinePoint` type for a given elliptic curve.
+pub trait FromEncodedPoint<C>
+where
+    Self: Sized,
+    C: Curve,
+    FieldBytesSize<C>: ModulusSize,
+{
+    /// Deserialize the type this trait is impl'd on from an [`EncodedPoint`].
+    fn from_encoded_point(point: &EncodedPoint<C>) -> CtOption<Self>;
+}
+
+/// Trait for serializing a value to a SEC1 encoded curve point.
+///
+/// This is intended for use with the `AffinePoint` type for a given elliptic curve.
+pub trait ToEncodedPoint<C>
+where
+    C: Curve,
+    FieldBytesSize<C>: ModulusSize,
+{
+    /// Serialize this value as a SEC1 [`EncodedPoint`], optionally applying
+    /// point compression.
+    fn to_encoded_point(&self, compress: bool) -> EncodedPoint<C>;
+}
+
+/// Trait for serializing a value to a SEC1 encoded curve point with compaction.
+///
+/// This is intended for use with the `AffinePoint` type for a given elliptic curve.
+pub trait ToCompactEncodedPoint<C>
+where
+    C: Curve,
+    FieldBytesSize<C>: ModulusSize,
+{
+    /// Serialize this value as a SEC1 [`EncodedPoint`], optionally applying
+    /// point compression.
+    fn to_compact_encoded_point(&self) -> CtOption<EncodedPoint<C>>;
+}
+
+/// Validate that the given [`EncodedPoint`] represents the encoded public key
+/// value of the given secret.
+///
+/// Curve implementations which also impl [`CurveArithmetic`] will receive
+/// a blanket default impl of this trait.
+pub trait ValidatePublicKey
+where
+    Self: Curve,
+    FieldBytesSize<Self>: ModulusSize,
+{
+    /// Validate that the given [`EncodedPoint`] is a valid public key for the
+    /// provided secret value.
+    #[allow(unused_variables)]
+    fn validate_public_key(
+        secret_key: &SecretKey<Self>,
+        public_key: &EncodedPoint<Self>,
+    ) -> Result<()> {
+        // Provide a default "always succeeds" implementation.
+        // This is the intended default for curve implementations which
+        // do not provide an arithmetic implementation, since they have no
+        // way to verify this.
+        //
+        // Implementations with an arithmetic impl will receive a blanket impl
+        // of this trait.
+        Ok(())
+    }
+}
+
+#[cfg(all(feature = "arithmetic"))]
+impl<C> ValidatePublicKey for C
+where
+    C: CurveArithmetic,
+    AffinePoint<C>: FromEncodedPoint<C> + ToEncodedPoint<C>,
+    FieldBytesSize<C>: ModulusSize,
+{
+    fn validate_public_key(secret_key: &SecretKey<C>, public_key: &EncodedPoint<C>) -> Result<()> {
+        let pk = secret_key
+            .public_key()
+            .to_encoded_point(public_key.is_compressed());
+
+        if public_key == &pk {
+            Ok(())
+        } else {
+            Err(Error)
+        }
+    }
+}