swisspost-evoting-go-poc/cmd/evote/demo.go

36 lines
940 B
Go
Raw Normal View History

package main
import (
Due-diligence hardening + Rust transport-security layer 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>
2026-07-06 12:42:34 +00:00
"fmt"
"github.com/spf13/cobra"
"github.com/user/evote/pkg/protocol"
)
var demoVoters int
var demoOptions int
Due-diligence hardening + Rust transport-security layer 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>
2026-07-06 12:42:34 +00:00
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.",
Due-diligence hardening + Rust transport-security layer 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>
2026-07-06 12:42:34 +00:00
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)
Due-diligence hardening + Rust transport-security layer 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>
2026-07-06 12:42:34 +00:00
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)
}