mirror of
https://github.com/saymrwulf/swisspost-evoting-go-poc.git
synced 2026-09-04 20:23:55 +00:00
saymrwulf
ec4be74e17
Correctness/security review of the whole PoC, with fixes and regression tests.
Cryptographic soundness:
- mixnet: enforce the multi-exponentiation c_{B_m}=commit(0;0) check that was
stubbed out with an empty if — without it a malicious mixer can prove a
non-permutation shuffle.
- zkp: derive all four Fiat-Shamir challenges via RecursiveHashToZq instead of
a biased `hash mod q` (which also capped the challenge space at 256 bits for
production-sized groups).
Verification honesty:
- protocol: VerifyTally now actually calls zkp.VerifySchnorrProof and returns
the true aggregate result instead of an unconditional true.
- protocol: persist the padded mix input (event.MixInput) so the verifier checks
shuffle 0 against the same padding the tally used (fixes false INVALID for N<2).
Other correctness:
- kdf: length-prefix BuildKDFInfo parts so the info encoding is injective.
- math: GqElementFromSquareRoot accepts the valid root q (off-by-one that could
panic in HashAndSquare); RandomGqElement samples the full canonical range.
- cmd: validate demo --voters/--options instead of panicking on degenerate values.
- protocol: use crypto/rand in the demo driver (drop the last math/rand import).
Transport security (new): pkg/transportsec exposes Ed25519 signatures and X25519
ECDH — implemented in Rust (rust/transportsec: ed25519-dalek, x25519-dalek),
linked into Go via cgo. No RSA. Cross-language conformance test proves the Rust
Ed25519 signatures interoperate with Go's crypto/ed25519. Makefile builds the
Rust static lib before the Go binary.
Tests: added unit/round-trip/tamper coverage for math, hash, elgamal, zkp,
mixnet, kdf, returncodes, protocol (end-to-end), and the Rust FFI bridge.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
35 lines
940 B
Go
35 lines
940 B
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/spf13/cobra"
|
|
"github.com/user/evote/pkg/protocol"
|
|
)
|
|
|
|
var demoVoters int
|
|
var demoOptions int
|
|
|
|
const maxDemoScale = 10000
|
|
|
|
var demoCmd = &cobra.Command{
|
|
Use: "demo",
|
|
Short: "Run a full election ceremony end-to-end",
|
|
Long: "Runs setup → vote → tally → verify in one command.",
|
|
RunE: func(cmd *cobra.Command, args []string) error {
|
|
if demoVoters < 0 || demoVoters > maxDemoScale {
|
|
return fmt.Errorf("--voters must be in [0, %d], got %d", maxDemoScale, demoVoters)
|
|
}
|
|
if demoOptions < 1 || demoOptions > maxDemoScale {
|
|
return fmt.Errorf("--options must be in [1, %d], got %d", maxDemoScale, demoOptions)
|
|
}
|
|
protocol.RunDemoElection(demoVoters, demoOptions)
|
|
return nil
|
|
},
|
|
}
|
|
|
|
func init() {
|
|
demoCmd.Flags().IntVar(&demoVoters, "voters", 10, "Number of voters")
|
|
demoCmd.Flags().IntVar(&demoOptions, "options", 2, "Number of voting options")
|
|
rootCmd.AddCommand(demoCmd)
|
|
}
|