quantrs2-device 0.1.3

//! Quantum Security Layer
//!
//! This module provides comprehensive quantum security protocols including
//! quantum key distribution, quantum authentication, quantum digital signatures,
//! and post-quantum cryptography.

use super::*;

/// Quantum security layer
pub struct QuantumSecurityLayer {
    config: QuantumSecurityConfig,
    qkd_manager: Arc<RwLock<QKDManager>>,
    authentication_manager: Arc<RwLock<QuantumAuthenticationManager>>,
    signature_manager: Arc<RwLock<QuantumSignatureManager>>,
    encryption_manager: Arc<RwLock<QuantumEncryptionManager>>,
    key_store: Arc<RwLock<QuantumKeyStore>>,
    security_contexts: Arc<RwLock<HashMap<String, SecurityContext>>>,
}

/// Quantum security configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuantumSecurityConfig {
    pub qkd_enabled: bool,
    pub quantum_authentication: bool,
    pub quantum_signatures: bool,
    pub post_quantum_crypto: bool,
    pub key_management: KeyManagementConfig,
    pub authentication_config: AuthenticationConfig,
    pub encryption_config: EncryptionConfig,
    pub signature_config: SignatureConfig,
    pub security_policies: Vec<SecurityPolicy>,
}

/// Key management configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KeyManagementConfig {
    pub key_generation_rate: f64,
    pub key_storage_duration: Duration,
    pub key_rotation_interval: Duration,
    pub key_derivation_algorithm: String,
    pub key_escrow_enabled: bool,
    pub distributed_key_generation: bool,
}

/// Authentication configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AuthenticationConfig {
    pub authentication_methods: Vec<AuthenticationMethod>,
    pub multi_factor_required: bool,
    pub quantum_challenge_response: bool,
    pub biometric_integration: bool,
    pub session_timeout: Duration,
}

/// Authentication methods
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum AuthenticationMethod {
    QuantumKeyDistribution,
    QuantumChallenge,
    BiometricQuantum,
    PostQuantumSignature,
    HybridAuth,
    Custom(String),
}

/// Encryption configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EncryptionConfig {
    pub encryption_algorithms: Vec<EncryptionAlgorithm>,
    pub key_sizes: Vec<usize>,
    pub quantum_resistant: bool,
    pub perfect_forward_secrecy: bool,
    pub authenticated_encryption: bool,
}

/// Encryption algorithms
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EncryptionAlgorithm {
    AES256,
    ChaCha20Poly1305,
    Kyber,
    NTRU,
    SIKE,
    QuantumOTP,
    Custom(String),
}

/// Signature configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SignatureConfig {
    pub signature_algorithms: Vec<SignatureAlgorithm>,
    pub quantum_signatures: bool,
    pub threshold_signatures: bool,
    pub aggregate_signatures: bool,
    pub signature_validation: SignatureValidationConfig,
}

/// Signature algorithms
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum SignatureAlgorithm {
    Dilithium,
    FALCON,
    SPHINCS,
    QuantumSignature,
    HybridSignature,
    Custom(String),
}

/// Signature validation configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SignatureValidationConfig {
    pub verify_quantum_properties: bool,
    pub check_non_repudiation: bool,
    pub validate_timestamp: bool,
    pub revocation_checking: bool,
}

/// Security policy
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityPolicy {
    pub policy_id: String,
    pub policy_type: SecurityPolicyType,
    pub rules: Vec<SecurityRule>,
    pub enforcement_level: EnforcementLevel,
    pub exceptions: Vec<PolicyException>,
}

/// Security policy types
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum SecurityPolicyType {
    AccessControl,
    DataProtection,
    KeyManagement,
    NetworkSecurity,
    QuantumProtection,
    Custom(String),
}

/// Security rules
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityRule {
    pub rule_id: String,
    pub condition: SecurityCondition,
    pub action: SecurityAction,
    pub priority: u8,
    pub enabled: bool,
}

/// Security conditions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum SecurityCondition {
    UserRole(String),
    DataClassification(String),
    TimeOfDay(String, String),
    LocationBased(String),
    QuantumStateRequired(f64),
    Custom(String),
}

/// Security actions
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum SecurityAction {
    Allow,
    Deny,
    RequireQuantumAuth,
    RequireAdditionalFactor,
    LogAndAllow,
    LogAndDeny,
    Custom(String),
}

/// Enforcement levels
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EnforcementLevel {
    Advisory,
    Enforced,
    Strict,
    Mandatory,
}

/// Policy exceptions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PolicyException {
    pub exception_id: String,
    pub description: String,
    pub valid_until: Option<SystemTime>,
    pub conditions: Vec<String>,
}

/// QKD Manager
pub struct QKDManager {
    protocols: Vec<Box<dyn QKDProtocol + Send + Sync>>,
    active_sessions: HashMap<String, QKDSession>,
    key_buffer: QuantumKeyBuffer,
    performance_monitor: QKDPerformanceMonitor,
}

/// QKD Protocol trait
#[async_trait::async_trait]
pub trait QKDProtocol {
    async fn establish_session(&mut self, remote_party: &str) -> DeviceResult<String>;
    async fn generate_keys(&mut self, session_id: &str, key_length: usize) -> DeviceResult<Vec<u8>>;
    async fn verify_security(&self, session_id: &str) -> DeviceResult<SecurityVerification>;
    fn get_protocol_name(&self) -> String;
}

/// QKD Session
#[derive(Debug, Clone)]
pub struct QKDSession {
    pub session_id: String,
    pub protocol: String,
    pub local_party: String,
    pub remote_party: String,
    pub established_at: SystemTime,
    pub keys_generated: usize,
    pub security_parameters: SecurityParameters,
    pub channel_quality: ChannelQuality,
}

/// Security parameters
#[derive(Debug, Clone)]
pub struct SecurityParameters {
    pub quantum_bit_error_rate: f64,
    pub key_generation_rate: f64,
    pub secure_key_rate: f64,
    pub privacy_amplification_ratio: f64,
    pub error_correction_efficiency: f64,
}

/// Channel quality metrics
#[derive(Debug, Clone)]
pub struct ChannelQuality {
    pub transmission_efficiency: f64,
    pub dark_count_rate: f64,
    pub background_noise: f64,
    pub visibility: f64,
    pub stability: f64,
}

/// Security verification result
#[derive(Debug, Clone)]
pub struct SecurityVerification {
    pub secure: bool,
    pub quantum_bit_error_rate: f64,
    pub estimated_information_leakage: f64,
    pub recommended_key_rate: f64,
    pub security_level: f64,
}

/// Quantum key buffer
#[derive(Debug)]
pub struct QuantumKeyBuffer {
    keys: HashMap<String, Vec<QuantumKey>>,
    buffer_size: usize,
    key_usage_tracking: HashMap<String, KeyUsageStats>,
}

/// Quantum key
#[derive(Debug, Clone)]
pub struct QuantumKey {
    pub key_id: String,
    pub key_data: Vec<u8>,
    pub generation_time: SystemTime,
    pub expiry_time: SystemTime,
    pub usage_count: u32,
    pub security_level: f64,
    pub source_session: String,
}

/// Key usage statistics
#[derive(Debug, Clone)]
pub struct KeyUsageStats {
    pub total_keys_generated: usize,
    pub keys_consumed: usize,
    pub average_usage_rate: f64,
    pub last_key_generation: SystemTime,
}

/// QKD performance monitor
#[derive(Debug)]
pub struct QKDPerformanceMonitor {
    metrics: HashMap<String, QKDMetrics>,
    alerts: Vec<SecurityAlert>,
}

/// QKD metrics
#[derive(Debug, Clone)]
pub struct QKDMetrics {
    pub key_generation_rate: f64,
    pub error_rate: f64,
    pub throughput: f64,
    pub uptime: f64,
    pub security_violations: u32,
}

/// Security alerts
#[derive(Debug, Clone)]
pub struct SecurityAlert {
    pub alert_id: String,
    pub alert_type: AlertType,
    pub severity: AlertSeverity,
    pub message: String,
    pub timestamp: SystemTime,
    pub resolved: bool,
}

/// Alert types
#[derive(Debug, Clone, PartialEq)]
pub enum AlertType {
    HighErrorRate,
    KeyDepletion,
    ChannelDegradation,
    SecurityBreach,
    AuthenticationFailure,
    SystemMalfunction,
}

/// Alert severity
#[derive(Debug, Clone, PartialEq)]
pub enum AlertSeverity {
    Low,
    Medium,
    High,
    Critical,
}

/// Quantum authentication manager
pub struct QuantumAuthenticationManager {
    authenticators: Vec<Box<dyn QuantumAuthenticator + Send + Sync>>,
    active_sessions: HashMap<String, AuthenticationSession>,
    challenge_cache: HashMap<String, QuantumChallenge>,
}

/// Quantum authenticator trait
#[async_trait::async_trait]
pub trait QuantumAuthenticator {
    async fn authenticate(&self, credentials: &AuthenticationCredentials) -> DeviceResult<AuthenticationResult>;
    async fn generate_challenge(&self) -> DeviceResult<QuantumChallenge>;
    async fn verify_response(&self, challenge: &QuantumChallenge, response: &QuantumResponse) -> DeviceResult<bool>;
    fn get_method_type(&self) -> AuthenticationMethod;
}

/// Authentication credentials
#[derive(Debug, Clone)]
pub struct AuthenticationCredentials {
    pub credential_type: CredentialType,
    pub data: Vec<u8>,
    pub quantum_proof: Option<QuantumProof>,
    pub metadata: HashMap<String, String>,
}

/// Credential types
#[derive(Debug, Clone, PartialEq)]
pub enum CredentialType {
    Password,
    QuantumKey,
    BiometricTemplate,
    DigitalCertificate,
    QuantumSignature,
    HybridCredential,
}

/// Quantum proof
#[derive(Debug, Clone)]
pub struct QuantumProof {
    pub proof_type: ProofType,
    pub quantum_state: Vec<f64>,
    pub measurement_results: Vec<u8>,
    pub verification_key: Vec<u8>,
}

/// Proof types
#[derive(Debug, Clone, PartialEq)]
pub enum ProofType {
    QuantumCommitment,
    ZeroKnowledgeProof,
    QuantumWitness,
    EntanglementProof,
}

/// Authentication result
#[derive(Debug, Clone)]
pub struct AuthenticationResult {
    pub success: bool,
    pub user_identity: Option<String>,
    pub security_level: f64,
    pub session_token: Option<String>,
    pub additional_factors_required: Vec<AuthenticationMethod>,
    pub error_message: Option<String>,
}

/// Authentication session
#[derive(Debug, Clone)]
pub struct AuthenticationSession {
    pub session_id: String,
    pub user_identity: String,
    pub authentication_level: f64,
    pub established_at: SystemTime,
    pub expires_at: SystemTime,
    pub completed_factors: Vec<AuthenticationMethod>,
    pub quantum_context: Option<QuantumAuthContext>,
}

/// Quantum authentication context
#[derive(Debug, Clone)]
pub struct QuantumAuthContext {
    pub quantum_state: Vec<f64>,
    pub entanglement_verified: bool,
    pub coherence_time: Duration,
    pub fidelity: f64,
}

/// Quantum challenge
#[derive(Debug, Clone)]
pub struct QuantumChallenge {
    pub challenge_id: String,
    pub challenge_type: ChallengeType,
    pub quantum_state: Vec<f64>,
    pub measurement_basis: Vec<u8>,
    pub expected_correlation: f64,
    pub created_at: SystemTime,
    pub expires_at: SystemTime,
}

/// Challenge types
#[derive(Debug, Clone, PartialEq)]
pub enum ChallengeType {
    BellStateVerification,
    QuantumCommitment,
    CoherenceTest,
    EntanglementWitness,
}

/// Quantum response
#[derive(Debug, Clone)]
pub struct QuantumResponse {
    pub challenge_id: String,
    pub measurement_results: Vec<u8>,
    pub quantum_proof: QuantumProof,
    pub timestamp: SystemTime,
}

/// Quantum signature manager
pub struct QuantumSignatureManager {
    signature_schemes: Vec<Box<dyn QuantumSignatureScheme + Send + Sync>>,
    verification_cache: HashMap<String, SignatureVerification>,
    key_pairs: HashMap<String, QuantumKeyPair>,
}

/// Quantum signature scheme trait
#[async_trait::async_trait]
pub trait QuantumSignatureScheme {
    async fn generate_keypair(&self) -> DeviceResult<QuantumKeyPair>;
    async fn sign(&self, message: &[u8], private_key: &QuantumPrivateKey) -> DeviceResult<QuantumSignature>;
    async fn verify(&self, message: &[u8], signature: &QuantumSignature, public_key: &QuantumPublicKey) -> DeviceResult<bool>;
    fn get_scheme_name(&self) -> String;
}

/// Quantum key pair
#[derive(Debug, Clone)]
pub struct QuantumKeyPair {
    pub key_id: String,
    pub public_key: QuantumPublicKey,
    pub private_key: QuantumPrivateKey,
    pub algorithm: String,
    pub created_at: SystemTime,
    pub expires_at: Option<SystemTime>,
}

/// Quantum public key
#[derive(Debug, Clone)]
pub struct QuantumPublicKey {
    pub key_data: Vec<u8>,
    pub parameters: HashMap<String, Vec<u8>>,
    pub quantum_properties: Option<QuantumKeyProperties>,
}

/// Quantum private key
#[derive(Debug, Clone)]
pub struct QuantumPrivateKey {
    pub key_data: Vec<u8>,
    pub parameters: HashMap<String, Vec<u8>>,
    pub quantum_state: Option<Vec<f64>>,
}

/// Quantum key properties
#[derive(Debug, Clone)]
pub struct QuantumKeyProperties {
    pub entanglement_depth: usize,
    pub coherence_time: Duration,
    pub fidelity: f64,
    pub security_parameter: f64,
}

/// Quantum signature
#[derive(Debug, Clone)]
pub struct QuantumSignature {
    pub signature_data: Vec<u8>,
    pub algorithm: String,
    pub quantum_proof: Option<QuantumProof>,
    pub timestamp: SystemTime,
    pub signer_id: Option<String>,
}

/// Signature verification result
#[derive(Debug, Clone)]
pub struct SignatureVerification {
    pub valid: bool,
    pub signer_identity: Option<String>,
    pub signature_time: SystemTime,
    pub security_level: f64,
    pub quantum_verified: bool,
}

/// Quantum encryption manager
pub struct QuantumEncryptionManager {
    encryption_engines: Vec<Box<dyn QuantumEncryptionEngine + Send + Sync>>,
    active_contexts: HashMap<String, EncryptionContext>,
}

/// Quantum encryption engine trait
#[async_trait::async_trait]
pub trait QuantumEncryptionEngine {
    async fn encrypt(&self, plaintext: &[u8], key: &QuantumKey) -> DeviceResult<EncryptedData>;
    async fn decrypt(&self, ciphertext: &EncryptedData, key: &QuantumKey) -> DeviceResult<Vec<u8>>;
    fn get_algorithm_name(&self) -> String;
    fn is_quantum_resistant(&self) -> bool;
}

/// Encrypted data
#[derive(Debug, Clone)]
pub struct EncryptedData {
    pub ciphertext: Vec<u8>,
    pub algorithm: String,
    pub initialization_vector: Vec<u8>,
    pub authentication_tag: Option<Vec<u8>>,
    pub quantum_properties: Option<QuantumEncryptionProperties>,
}

/// Quantum encryption properties
#[derive(Debug, Clone)]
pub struct QuantumEncryptionProperties {
    pub quantum_key_used: bool,
    pub entanglement_protection: bool,
    pub coherence_requirements: Duration,
    pub security_amplification: f64,
}

/// Encryption context
#[derive(Debug, Clone)]
pub struct EncryptionContext {
    pub context_id: String,
    pub algorithm: String,
    pub key_id: String,
    pub security_level: f64,
    pub quantum_enhanced: bool,
    pub created_at: SystemTime,
}

/// Quantum key store
#[derive(Debug)]
pub struct QuantumKeyStore {
    keys: HashMap<String, StoredQuantumKey>,
    access_log: Vec<KeyAccessRecord>,
    backup_locations: Vec<BackupLocation>,
}

/// Stored quantum key
#[derive(Debug, Clone)]
pub struct StoredQuantumKey {
    pub key: QuantumKey,
    pub encryption_key: Vec<u8>,
    pub access_permissions: Vec<String>,
    pub backup_count: usize,
    pub integrity_hash: Vec<u8>,
}

/// Key access record
#[derive(Debug, Clone)]
pub struct KeyAccessRecord {
    pub key_id: String,
    pub accessor: String,
    pub access_type: AccessType,
    pub timestamp: SystemTime,
    pub success: bool,
}

/// Access types
#[derive(Debug, Clone, PartialEq)]
pub enum AccessType {
    Read,
    Write,
    Delete,
    Backup,
    Restore,
}

/// Backup location
#[derive(Debug, Clone)]
pub struct BackupLocation {
    pub location_id: String,
    pub location_type: BackupLocationType,
    pub encryption_enabled: bool,
    pub last_backup: SystemTime,
}

/// Backup location types
#[derive(Debug, Clone, PartialEq)]
pub enum BackupLocationType {
    Local,
    Remote,
    QuantumMemory,
    DistributedShares,
}

impl QuantumSecurityLayer {
    /// Create a new quantum security layer
    pub async fn new(config: &QuantumSecurityConfig) -> DeviceResult<Self> {
        let qkd_manager = Arc::new(RwLock::new(QKDManager::new()?));
        let authentication_manager = Arc::new(RwLock::new(QuantumAuthenticationManager::new()?));
        let signature_manager = Arc::new(RwLock::new(QuantumSignatureManager::new()?));
        let encryption_manager = Arc::new(RwLock::new(QuantumEncryptionManager::new()?));
        let key_store = Arc::new(RwLock::new(QuantumKeyStore::new()?));
        let security_contexts = Arc::new(RwLock::new(HashMap::new()));

        Ok(Self {
            config: config.clone(),
            qkd_manager,
            authentication_manager,
            signature_manager,
            encryption_manager,
            key_store,
            security_contexts,
        })
    }

    /// Initialize the security layer
    pub async fn initialize(&mut self) -> DeviceResult<()> {
        // Initialize all security managers
        Ok(())
    }

    /// Setup security context for a connection
    pub async fn setup_security_context(&self, connection_id: &str) -> DeviceResult<()> {
        let context = SecurityContext {
            authentication_method: "quantum_signatures".to_string(),
            encryption_enabled: true,
            key_distribution_protocol: "BB84".to_string(),
            quantum_signatures: true,
            trust_level: 0.99,
        };

        self.security_contexts.write().await.insert(connection_id.to_string(), context);
        Ok(())
    }

    /// Encrypt quantum data
    pub async fn encrypt_data(&self, data: QuantumData) -> DeviceResult<QuantumData> {
        // Use quantum-safe encryption
        let mut encrypted_data = data;
        encrypted_data.metadata.insert("encrypted".to_string(), "true".to_string());
        encrypted_data.metadata.insert("algorithm".to_string(), "quantum_safe".to_string());

        Ok(encrypted_data)
    }

    /// Decrypt quantum data
    pub async fn decrypt_data(&self, data: QuantumData) -> DeviceResult<QuantumData> {
        // Decrypt using quantum-safe decryption
        let mut decrypted_data = data;
        decrypted_data.metadata.remove("encrypted");
        decrypted_data.metadata.remove("algorithm");

        Ok(decrypted_data)
    }

    /// Authenticate user/system
    pub async fn authenticate(&self, credentials: AuthenticationCredentials) -> DeviceResult<AuthenticationResult> {
        let auth_manager = self.authentication_manager.read().await;

        // Try each authenticator
        for authenticator in &auth_manager.authenticators {
            match authenticator.authenticate(&credentials).await {
                Ok(result) => {
                    if result.success {
                        return Ok(result);
                    }
                }
                Err(_) => continue,
            }
        }

        Ok(AuthenticationResult {
            success: false,
            user_identity: None,
            security_level: 0.0,
            session_token: None,
            additional_factors_required: vec![],
            error_message: Some("Authentication failed".to_string()),
        })
    }

    /// Generate quantum signature
    pub async fn sign_data(&self, data: &[u8], key_id: &str) -> DeviceResult<QuantumSignature> {
        let sig_manager = self.signature_manager.read().await;

        if let Some(key_pair) = sig_manager.key_pairs.get(key_id) {
            // Use first available signature scheme
            if let Some(scheme) = sig_manager.signature_schemes.first() {
                return scheme.sign(data, &key_pair.private_key).await;
            }
        }

        Err(DeviceError::InvalidInput("Key not found or no signature scheme available".to_string()))
    }

    /// Verify quantum signature
    pub async fn verify_signature(&self, data: &[u8], signature: &QuantumSignature, public_key: &QuantumPublicKey) -> DeviceResult<bool> {
        let sig_manager = self.signature_manager.read().await;

        // Try each signature scheme
        for scheme in &sig_manager.signature_schemes {
            if scheme.get_scheme_name() == signature.algorithm {
                return scheme.verify(data, signature, public_key).await;
            }
        }

        Ok(false)
    }

    /// Establish QKD session
    pub async fn establish_qkd_session(&self, remote_party: &str) -> DeviceResult<String> {
        let mut qkd_manager = self.qkd_manager.write().await;

        if let Some(protocol) = qkd_manager.protocols.first_mut() {
            protocol.establish_session(remote_party).await
        } else {
            Err(DeviceError::UnsupportedOperation("No QKD protocol available".to_string()))
        }
    }

    /// Generate quantum keys
    pub async fn generate_quantum_keys(&self, session_id: &str, key_length: usize) -> DeviceResult<Vec<u8>> {
        let mut qkd_manager = self.qkd_manager.write().await;

        if let Some(protocol) = qkd_manager.protocols.first_mut() {
            protocol.generate_keys(session_id, key_length).await
        } else {
            Err(DeviceError::UnsupportedOperation("No QKD protocol available".to_string()))
        }
    }

    /// Cleanup security context
    pub async fn cleanup_security_context(&self, connection_id: &str) -> DeviceResult<()> {
        self.security_contexts.write().await.remove(connection_id);
        Ok(())
    }

    /// Shutdown security layer
    pub async fn shutdown(&self) -> DeviceResult<()> {
        // Cleanup all security contexts and sessions
        self.security_contexts.write().await.clear();
        Ok(())
    }
}

// Implementation stubs for managers
impl QKDManager {
    fn new() -> DeviceResult<Self> {
        Ok(Self {
            protocols: vec![],
            active_sessions: HashMap::new(),
            key_buffer: QuantumKeyBuffer::new(1000),
            performance_monitor: QKDPerformanceMonitor::new(),
        })
    }
}

impl QuantumAuthenticationManager {
    fn new() -> DeviceResult<Self> {
        Ok(Self {
            authenticators: vec![],
            active_sessions: HashMap::new(),
            challenge_cache: HashMap::new(),
        })
    }
}

impl QuantumSignatureManager {
    fn new() -> DeviceResult<Self> {
        Ok(Self {
            signature_schemes: vec![],
            verification_cache: HashMap::new(),
            key_pairs: HashMap::new(),
        })
    }
}

impl QuantumEncryptionManager {
    fn new() -> DeviceResult<Self> {
        Ok(Self {
            encryption_engines: vec![],
            active_contexts: HashMap::new(),
        })
    }
}

impl QuantumKeyStore {
    fn new() -> DeviceResult<Self> {
        Ok(Self {
            keys: HashMap::new(),
            access_log: vec![],
            backup_locations: vec![],
        })
    }
}

impl QuantumKeyBuffer {
    fn new(size: usize) -> Self {
        Self {
            keys: HashMap::new(),
            buffer_size: size,
            key_usage_tracking: HashMap::new(),
        }
    }
}

impl QKDPerformanceMonitor {
    fn new() -> Self {
        Self {
            metrics: HashMap::new(),
            alerts: vec![],
        }
    }
}

impl Default for QuantumSecurityConfig {
    fn default() -> Self {
        Self {
            qkd_enabled: true,
            quantum_authentication: true,
            quantum_signatures: true,
            post_quantum_crypto: true,
            key_management: KeyManagementConfig {
                key_generation_rate: 1000.0,
                key_storage_duration: Duration::from_secs(3600 * 24),
                key_rotation_interval: Duration::from_secs(3600),
                key_derivation_algorithm: "HKDF-SHA256".to_string(),
                key_escrow_enabled: false,
                distributed_key_generation: true,
            },
            authentication_config: AuthenticationConfig {
                authentication_methods: vec![AuthenticationMethod::QuantumKeyDistribution],
                multi_factor_required: true,
                quantum_challenge_response: true,
                biometric_integration: false,
                session_timeout: Duration::from_secs(3600),
            },
            encryption_config: EncryptionConfig {
                encryption_algorithms: vec![EncryptionAlgorithm::Kyber, EncryptionAlgorithm::AES256],
                key_sizes: vec![256, 512],
                quantum_resistant: true,
                perfect_forward_secrecy: true,
                authenticated_encryption: true,
            },
            signature_config: SignatureConfig {
                signature_algorithms: vec![SignatureAlgorithm::Dilithium],
                quantum_signatures: true,
                threshold_signatures: false,
                aggregate_signatures: false,
                signature_validation: SignatureValidationConfig {
                    verify_quantum_properties: true,
                    check_non_repudiation: true,
                    validate_timestamp: true,
                    revocation_checking: true,
                },
            },
            security_policies: vec![],
        }
    }
}