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scarb nightly-2024-04-24 |
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mod fields; | ||
mod vcs; | ||
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pub type BaseField = fields::m31::M31; | ||
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fn main() {} |
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use core::array::ArrayTrait; | ||
use core::option::OptionTrait; | ||
use core::poseidon::poseidon_hash_span; | ||
use stwo_cairo_verifier::BaseField; | ||
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pub trait MerkleHasher { | ||
type Hash; | ||
/// Hashes a single Merkle node. See [MerkleHasher] for more details. | ||
fn hash_node( | ||
children_hashes: Option<(Self::Hash, Self::Hash)>, column_values: Array<BaseField>, | ||
) -> Self::Hash; | ||
} | ||
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pub impl PoseidonMerkleHasher of MerkleHasher { | ||
type Hash = felt252; | ||
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fn hash_node( | ||
children_hashes: Option<(Self::Hash, Self::Hash)>, mut column_values: Array<BaseField>, | ||
) -> Self::Hash { | ||
let mut hash_array: Array<felt252> = Default::default(); | ||
if let Option::Some((x, y)) = children_hashes { | ||
hash_array.append(x); | ||
hash_array.append(y); | ||
} | ||
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// Pad column_values to a multiple of 8. | ||
let mut pad_len = 7 - ((column_values.len() + 7) % 8); | ||
while pad_len > 0 { | ||
column_values.append(core::num::traits::Zero::zero()); | ||
pad_len = 7 - ((column_values.len() + 7) % 8); | ||
}; | ||
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while !column_values.is_empty() { | ||
let mut word = 0; | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
word = word * 0x80000000 + column_values.pop_front().unwrap().inner.into(); | ||
}; | ||
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poseidon_hash_span(hash_array.span()) | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::PoseidonMerkleHasher; | ||
use stwo_cairo_verifier::fields::m31::{m31}; | ||
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#[test] | ||
fn test_m31() { | ||
assert_eq!( | ||
PoseidonMerkleHasher::hash_node(Option::None, array![m31(0), m31(1)]), | ||
973835572668429495915136902981656666590582180872133591629269551720657739196 | ||
); | ||
} | ||
} |