anya-core 1.2.0

//! Open-Source PKCS#11 HSM Provider
//!
//! This module provides integration with PKCS#11 compliant hardware security devices.
//! PKCS#11 is a platform-independent API for cryptographic tokens such as hardware
//! security modules (HSM) and smart cards.
//!
//! The current implementation is a stub that will be expanded with actual PKCS#11
//! functionality in future versions.

use async_trait::async_trait;
use std::sync::Arc;

use crate::security::hsm::audit::AuditLogger;
use crate::security::hsm::config::Pkcs11Config;
use crate::security::hsm::error::{AuditEventResult, AuditEventSeverity, AuditEventType, HsmError};
use crate::security::hsm::provider::{
    HsmProvider, HsmProviderStatus, HsmRequest, HsmResponse, KeyGenParams, KeyInfo, KeyPair,
    SigningAlgorithm,
};

/// PKCS#11 HSM Provider for hardware security devices
///
/// This provider implements the HsmProvider trait for PKCS#11 compatible devices.
/// Currently implemented as a stub with placeholder functionality.
#[derive(Debug)]
pub struct Pkcs11HsmProvider {
    /// Audit logger for security events
    audit_logger: Arc<AuditLogger>,
}

impl Pkcs11HsmProvider {
    /// Create a new PKCS#11 HSM provider with the specified configuration
    ///
    /// # Arguments
    ///
    /// * `_config` - The PKCS#11 configuration
    /// * `audit_logger` - Logger for security audit events
    ///
    /// # Returns
    ///
    /// A new PKCS#11 HSM provider or an error if initialization fails
    pub fn new(_config: &Pkcs11Config, audit_logger: Arc<AuditLogger>) -> Result<Self, HsmError> {
        Ok(Self { audit_logger })
    }

    /// Log a stub operation attempt
    async fn log_stub_operation(&self, operation: &str) -> Result<(), HsmError> {
        self.audit_logger
            .log(
                AuditEventType::HsmOperation,
                AuditEventResult::Failure,
                AuditEventSeverity::Warning,
                &format!("Attempted unsupported operation: {}", operation),
            )
            .await
    }
}

#[async_trait]
impl HsmProvider for Pkcs11HsmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the PKCS#11 library
        // and establish a connection to the device
        self.audit_logger
            .log(
                AuditEventType::Initialization,
                AuditEventResult::Success,
                AuditEventSeverity::Info,
                "PKCS#11 provider initialized (stub implementation)",
            )
            .await?;

        Ok(())
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        self.log_stub_operation("generate_key").await?;
        Err(HsmError::UnsupportedOperation(
            "Key generation not implemented yet. Will be available in future versions.".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        self.log_stub_operation("sign").await?;
        Err(HsmError::UnsupportedOperation(
            "Signing operation not implemented yet. Will be available in future versions."
                .to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        self.log_stub_operation("verify").await?;
        Err(HsmError::UnsupportedOperation(
            "Signature verification not implemented yet. Will be available in future versions."
                .to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        self.log_stub_operation("export_public_key").await?;
        Err(HsmError::UnsupportedOperation(
            "Public key export not implemented yet. Will be available in future versions."
                .to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        // Return empty list for stub implementation
        Ok(vec![])
    }

    async fn delete_key(&self, _key_id: &str) -> Result<(), HsmError> {
        self.log_stub_operation("delete_key").await?;
        Err(HsmError::UnsupportedOperation(
            "Key deletion not implemented yet. Will be available in future versions.".to_string(),
        ))
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Always unavailable in stub implementation
        Ok(HsmProviderStatus::Unavailable)
    }

    async fn close(&self) -> Result<(), HsmError> {
        // No resources to release in stub implementation
        Ok(())
    }

    async fn execute_operation(&self, request: HsmRequest) -> Result<HsmResponse, HsmError> {
        self.log_stub_operation(&format!("execute_operation: {:?}", request.operation))
            .await?;
        Err(HsmError::UnsupportedOperation(format!(
            "Operation {:?} not supported in the PKCS#11 provider stub implementation",
            request.operation
        )))
    }
}