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add select hash helper fn

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M Alghazwi 2024-12-13 16:37:26 +03:00
parent e5985184df
commit b280a5252c
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1 changed files with 16 additions and 0 deletions
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16
codex-plonky2-circuits/src/circuits/utils.rs
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@ -90,3 +90,19 @@ pub fn add_assign_hash_out_target<
pub fn read_bytes_from_file<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> { pub fn read_bytes_from_file<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
fs::read(path) fs::read(path)
} }
/// select hash helper method
/// Computes `if b { h0 } else { h1 }`.
pub fn select_hash<
F: RichField + Extendable<D> + Poseidon2,
const D: usize,
>(
builder: &mut CircuitBuilder<F, D>,
b: BoolTarget,
h0: HashOutTarget,
h1: HashOutTarget,
) -> HashOutTarget {
HashOutTarget {
elements: core::array::from_fn(|i| builder.select(b, h0.elements[i], h1.elements[i])),
}
}