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Bug: Cubic extension conjugate #398

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mratsim opened this issue Jun 24, 2024 · 0 comments

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bug 🪲 correctness 🛂

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mratsim commented Jun 24, 2024

From @yelhousni

constantine/constantine/math/extension_fields/towers.nim

Lines 221 to 225 in ab6fa6a

    
           func conj*(r: var CubicExt, a: CubicExt) = 
        
             ## Computes the conjugate out-of-place 
        
             r.c0.conj(a.c0) 
        
             r.c1.conjneg(a.c1) 
        
             r.c2.conj(a.c2)

This is only valid if non-residue is sqrt(-1) and (p-1)/3 is odd which is the case for BLS12-381.

mratsim added bug 🪲 correctness 🛂 labels

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