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fix(primitives): commit function #487

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fix(primitives): commit function #487

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15 changes: 7 additions & 8 deletions primitives/src/commitment.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -66,19 +66,18 @@ impl<F: RescueParameter, const INPUT_LEN: usize, const INPUT_LEN_PLUS_ONE: usize
type Input = [F; INPUT_LEN];
type Output = F;
type Randomness = F;

fn commit<T: Borrow<Self::Input>>(
input: T,
r: Option<&Self::Randomness>,
) -> Result<Self::Output, PrimitivesError> {
let mut msg = [F::zero(); INPUT_LEN_PLUS_ONE];
msg[0] = *r.ok_or_else(|| {
PrimitivesError::ParameterError("Expecting a blinding factor".to_string())
})?;
msg[1..INPUT_LEN_PLUS_ONE].copy_from_slice(&input.borrow()[..(INPUT_LEN)]);

Ok(FixedLengthRescueCRHF::<F, INPUT_LEN_PLUS_ONE, 1>::evaluate(&msg)?[0])
}

if let Some(blinding_factor) = r {
msg[0] = *blinding_factor;
} else {
return Err(PrimitivesError::ParameterError("Blinding factor is required".to_string()));
}

fn verify<T: Borrow<Self::Input>>(
input: T,
Expand Down