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elliptic-curve: add back FromPublicKey trait #248

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Merged
tarcieri merged 1 commit into from
Aug 4, 2020
Merged

elliptic-curve: add back FromPublicKey trait #248

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19 changes: 19 additions & 0 deletions elliptic-curve/src/weierstrass/public_key.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ use generic_array::{
typenum::{Unsigned, U1},
ArrayLength, GenericArray,
};
use subtle::CtOption;

/// Size of an untagged point for given elliptic curve.
pub type UntaggedPointSize<C> = <<C as crate::Curve>::ElementSize as Add>::Output;
Expand Down Expand Up @@ -206,3 +207,21 @@ where
PublicKey::Uncompressed(point)
}
}

/// Trait for deserializing a value from a public key.
///
/// This is intended for use with the `AffinePoint` type for a given elliptic curve.
pub trait FromPublicKey<C: Curve>: Sized
where
C::ElementSize: Add<U1>,
<C::ElementSize as Add>::Output: Add<U1>,
CompressedPointSize<C>: ArrayLength<u8>,
UncompressedPointSize<C>: ArrayLength<u8>,
{
/// Deserialize this value from a [`PublicKey`]
///
/// # Returns
///
/// `None` if the public key is not on the curve.
fn from_public_key(public_key: &PublicKey<C>) -> CtOption<Self>;
}