rust_ev_verifier_lib 0.4.5

Main library for the E-Voting system of Swiss Post.
Documentation 
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// Copyright © 2025 Denis Morel
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option) any
// later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License and
// a copy of the GNU General Public License along with this program. If not, see
// <https://www.gnu.org/licenses/>.

use super::super::super::result::{VerificationEvent, VerificationResult};
use crate::{
    config::VerifierConfig,
    file_structure::{VerificationDirectoryTrait, context_directory::ContextDirectoryTrait},
};

use rust_ev_system_library::rust_ev_crypto_primitives::prelude::elgamal::EncryptionParameters;

pub(super) fn fn_0501_verify_encryption_parameters<D: VerificationDirectoryTrait>(
    dir: &D,
    _config: &'static VerifierConfig,
    result: &mut VerificationResult,
) {
    let context_dir = dir.context();
    let eg = match context_dir.election_event_context_payload() {
        Ok(eg) => eg,
        Err(e) => {
            result.push(
                VerificationEvent::new_error_from_error(&e)
                    .add_context("election_event_context_payload cannot be read"),
            );
            return;
        }
    };
    let eg_test = match EncryptionParameters::get_encryption_parameters(&eg.seed) {
        Ok(eg) => eg,
        Err(e) => {
            result.push(
                VerificationEvent::new_error_from_error(&e).add_context(format!(
                    "Error calculating encrpytion parameters from seed {}",
                    eg.seed
                )),
            );
            return;
        }
    };
    if eg_test.p() != eg.encryption_group.p() {
        result.push(VerificationEvent::new_failure(&format!(
            "payload p and calculated p are not equal: payload: {} / calculated: {}",
            eg.encryption_group.p(),
            eg_test.p()
        )));
    }
    if eg_test.q() != eg.encryption_group.q() {
        result.push(VerificationEvent::new_failure(&format!(
            "payload q and calculated q are not equal: payload: {} / calculated: {}",
            eg.encryption_group.q(),
            eg_test.q()
        )));
    }
    if eg_test.g() != eg.encryption_group.g() {
        result.push(VerificationEvent::new_failure(&format!(
            "payload g and calculated g are not equal: payload: {} / calculated: {}",
            eg.encryption_group.g(),
            eg_test.g()
        )))
    }
}

#[cfg(test)]
mod test {
    use rust_ev_system_library::rust_ev_crypto_primitives::prelude::Integer;

    use super::*;
    use crate::config::test::{
        CONFIG_TEST, get_test_verifier_mock_setup_dir,
        get_test_verifier_setup_dir as get_verifier_dir,
    };

    #[test]
    fn test_0501_ok() {
        let dir = get_verifier_dir();
        let mut result = VerificationResult::new();
        fn_0501_verify_encryption_parameters(&dir, &CONFIG_TEST, &mut result);
        assert!(result.is_ok());
    }

    #[test]
    fn test_wrong_seed() {
        let mut result = VerificationResult::new();
        let mut mock_dir = get_test_verifier_mock_setup_dir();
        mock_dir
            .context_mut()
            .mock_election_event_context_payload(|d| {
                d.seed = "wrongseed".to_string();
            });
        fn_0501_verify_encryption_parameters(&mock_dir, &CONFIG_TEST, &mut result);
        assert!(result.has_failures());
    }

    #[test]
    fn test_wrong_p() {
        let mut result = VerificationResult::new();
        let mut mock_dir = get_test_verifier_mock_setup_dir();
        mock_dir
            .context_mut()
            .mock_election_event_context_payload(|d| {
                d.encryption_group.set_p(&Integer::from(13u32));
            });
        fn_0501_verify_encryption_parameters(&mock_dir, &CONFIG_TEST, &mut result);
        assert!(result.has_failures());
    }

    #[test]
    fn test_wrong_q() {
        let mut result = VerificationResult::new();
        let mut mock_dir = get_test_verifier_mock_setup_dir();
        mock_dir
            .context_mut()
            .mock_election_event_context_payload(|d| {
                d.encryption_group.set_q(&Integer::from(13u32));
            });
        fn_0501_verify_encryption_parameters(&mock_dir, &CONFIG_TEST, &mut result);
        assert!(result.has_failures());
    }

    #[test]
    fn test_wrong_g() {
        let mut result = VerificationResult::new();
        let mut mock_dir = get_test_verifier_mock_setup_dir();
        mock_dir
            .context_mut()
            .mock_election_event_context_payload(|d| {
                d.encryption_group.set_g(&Integer::from(13u32));
            });
        fn_0501_verify_encryption_parameters(&mock_dir, &CONFIG_TEST, &mut result);
        assert!(result.has_failures());
    }
}