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https://github.com/saymrwulf/swisspost-evoting-go-poc.git
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saymrwulf
e8b6f30871
Proof-of-concept reimplementation of the Swiss Post e-voting cryptographic protocol in Go. Single binary, 52 source files, 2 dependencies. Covers ElGamal encryption, Bayer-Groth verifiable shuffles, zero-knowledge proofs, return codes, and a full election ceremony demo.
25 lines
586 B
Go
25 lines
586 B
Go
package mixnet
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import (
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"math/big"
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emath "github.com/user/evote/pkg/math"
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)
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// StarMap computes the bilinear star map: ★(a, b, y) = Σ_j (a_j * b_j * y^(j+1))
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func StarMap(a, b *emath.ZqVector, y emath.ZqElement) emath.ZqElement {
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if a.Size() != b.Size() {
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panic("vectors must have same size")
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}
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group := y.Group()
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result, _ := emath.NewZqElement(big.NewInt(0), group)
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yPow := y // y^1
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for j := 0; j < a.Size(); j++ {
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// a_j * b_j * y^(j+1)
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term := a.Get(j).Multiply(b.Get(j)).Multiply(yPow)
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result = result.Add(term)
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yPow = yPow.Multiply(y)
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}
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return result
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}
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