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Fix compress function #6

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Merged
chetanyb merged 2 commits into from
Oct 19, 2025
Merged

Fix compress function #6

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12852e5
fix: removed message argument from assert
chetanyb Oct 17, 2025
7c04684
fix: correct Montgomery form handling in compress
chetanyb Oct 17, 2025
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1 change: 0 additions & 1 deletion build.zig.zon
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Original file line number Diff line number Diff line change
Expand Up @@ -15,4 +15,3 @@
"VERSION",
},
}

14 changes: 10 additions & 4 deletions src/poseidon2/poseidon2.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -30,18 +30,24 @@ pub fn Poseidon2(
pub const State = [width]F.MontFieldElem;

pub fn compress(comptime output_len: comptime_int, input: [width]F.FieldElem) [output_len]F.FieldElem {
assert(output_len <= width, "output_len must be <= width");
assert(output_len <= width);

var state: State = undefined;
inline for (0..width) |i| {
F.toMontgomery(&state[i], input[i]);
}
permutation(&state);
inline for (0..width) |i| {
F.add(&state[i], state[i], input[i]);
F.fromMontgomery(&state[i], state[i]);
var input_mont: F.MontFieldElem = undefined;
F.toMontgomery(&input_mont, input[i]);
F.add(&state[i], state[i], input_mont);
}
return state[0..output_len];

var result: [output_len]F.FieldElem = undefined;
inline for (0..output_len) |i| {
result[i] = F.toNormal(state[i]);
}
return result;
}

pub fn permutation(state: *State) void {
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