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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.
38 lines
1 KiB
Go
38 lines
1 KiB
Go
package zkp
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import (
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emath "github.com/user/evote/pkg/math"
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)
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// SchnorrProof is a proof of knowledge of discrete logarithm.
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// Proves knowledge of x such that y = g^x.
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type SchnorrProof struct {
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E emath.ZqElement // Hash challenge
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Z emath.ZqElement // Response
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}
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// ExponentiationProof proves that multiple values are exponentiations
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// of bases by the same exponent.
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type ExponentiationProof struct {
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E emath.ZqElement // Hash challenge
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Z emath.ZqElement // Response
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}
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// PlaintextEqualityProof proves two ciphertexts encrypt the same plaintext
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// under different keys.
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type PlaintextEqualityProof struct {
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E emath.ZqElement // Hash challenge
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Z *emath.ZqVector // Response vector (size 2)
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}
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// DecryptionProof proves correct decryption of an ElGamal ciphertext.
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type DecryptionProof struct {
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E emath.ZqElement // Hash challenge
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Z *emath.ZqVector // Response vector (size l)
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}
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// VerifiableDecryptions holds a set of decrypted messages with proofs.
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type VerifiableDecryptions struct {
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Messages []emath.GqElement
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Proofs []DecryptionProof
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}
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