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docs: improve HASHER_BASE constant readability and documentation #417

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docs: improve HASHER_BASE constant readability and documentation #417

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6 changes: 4 additions & 2 deletions src/frontend/gadgets/poseidon/sponge/api.rs
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Expand Up @@ -40,8 +40,10 @@ impl IOPattern {
}
}

// A large 128-bit prime, per https://primes.utm.edu/lists/2small/100bit.html.
const HASHER_BASE: u128 = (0 - 159) as u128;
// Large 128-bit constant for sponge construction hashing.
// Using 2^128 - 159, which provides good distribution properties
// for the hasher state computation in sponge operations.
const HASHER_BASE: u128 = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFu128 - 158;

#[derive(Clone, Copy, Debug)]
pub(crate) struct Hasher {
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