24 lines
830 B
Rust
24 lines
830 B
Rust
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use crate::group::Group;
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use curve25519_dalek::{edwards::EdwardsPoint, ristretto::RistrettoPoint};
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use generic_array::GenericArray;
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use hkdf::Hkdf;
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pub trait GroupWithMapToCurve: Group {
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self;
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}
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impl GroupWithMapToCurve for RistrettoPoint {
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self {
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let (hashed_input, _) = Hkdf::<sha2::Sha512>::extract(pepper, password);
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<Self as Group>::hash_to_curve(GenericArray::from_slice(&hashed_input))
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}
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}
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impl GroupWithMapToCurve for EdwardsPoint {
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fn map_to_curve(password: &[u8], pepper: Option<&[u8]>) -> Self {
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let (hashed_input, _) = Hkdf::<sha2::Sha256>::extract(pepper, password);
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<Self as Group>::hash_to_curve(GenericArray::from_slice(&hashed_input))
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}
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}
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