hanzo-crypto 0.1.0

//! Attestation support for TEE environments

#[cfg(feature = "cpu-tee")]
use crate::PqcError;
use crate::Result;
use serde::{Deserialize, Serialize};

/// TEE attestation verifier trait
pub trait AttestationVerifier: Send + Sync {
    /// Verify CPU TEE attestation
    fn verify_cpu_attestation(&self, quote: &[u8], expected_measurement: &[u8]) -> Result<bool>;

    /// Verify GPU attestation via NRAS
    fn verify_gpu_attestation(&self, nras_token: &[u8]) -> Result<GpuAttestationResult>;
}

/// GPU attestation result from NRAS
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GpuAttestationResult {
    pub valid: bool,
    pub device_id: String,
    pub gpu_model: String,
    pub cc_enabled: bool,
    pub tee_io_enabled: bool,
    pub mig_config: Option<MigConfiguration>,
    pub driver_version: String,
    pub vbios_version: String,
}

/// MIG (Multi-Instance GPU) configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MigConfiguration {
    pub enabled: bool,
    pub instance_id: String,
    pub profile: String,
    pub memory_size_gb: u32,
    pub compute_units: u32,
}

/// Mock attestation verifier for testing
pub struct MockAttestationVerifier;

impl AttestationVerifier for MockAttestationVerifier {
    fn verify_cpu_attestation(&self, _quote: &[u8], _expected_measurement: &[u8]) -> Result<bool> {
        // In production, this would:
        // 1. Parse the quote format (SEV-SNP/TDX)
        // 2. Verify signature chain to vendor root
        // 3. Check measurement matches expected
        // 4. Validate freshness/nonce
        Ok(true)
    }

    fn verify_gpu_attestation(&self, _nras_token: &[u8]) -> Result<GpuAttestationResult> {
        // In production, this would:
        // 1. Send token to NVIDIA Remote Attestation Service
        // 2. Verify response signature
        // 3. Extract GPU capabilities
        Ok(GpuAttestationResult {
            valid: true,
            device_id: "GPU-MOCK-001".to_string(),
            gpu_model: "NVIDIA H100".to_string(),
            cc_enabled: true,
            tee_io_enabled: false,
            mig_config: None,
            driver_version: "535.154.05".to_string(),
            vbios_version: "96.00.89.00.01".to_string(),
        })
    }
}

/// SEV-SNP attestation report parser
#[cfg(feature = "cpu-tee")]
pub mod sev_snp {
    use super::*;

    #[derive(Debug, Clone, Serialize, Deserialize)]
    pub struct SevSnpReport {
        pub version: u32,
        pub guest_svn: u32,
        pub policy: u64,
        pub family_id: [u8; 16],
        pub image_id: [u8; 16],
        pub vmpl: u32,
        pub signature_algo: u32,
        pub platform_version: u64,
        pub platform_info: u64,
        pub author_key_en: u32,
        pub report_data: [u8; 64],
        pub measurement: [u8; 48],
        pub host_data: [u8; 32],
        pub id_key_digest: [u8; 48],
        pub author_key_digest: [u8; 48],
        pub report_id: [u8; 32],
        pub report_id_ma: [u8; 32],
        pub reported_tcb: u64,
        pub chip_id: [u8; 64],
        pub signature: [u8; 512],
    }

    impl SevSnpReport {
        pub fn parse(data: &[u8]) -> Result<Self> {
            if data.len() < 1184 {
                return Err(PqcError::AttestationError(
                    "Invalid SEV-SNP report size".into(),
                ));
            }

            // Parse binary format (simplified)
            Ok(Self {
                version: u32::from_le_bytes([data[0], data[1], data[2], data[3]]),
                guest_svn: u32::from_le_bytes([data[4], data[5], data[6], data[7]]),
                policy: u64::from_le_bytes(data[8..16].try_into().unwrap()),
                family_id: data[16..32].try_into().unwrap(),
                image_id: data[32..48].try_into().unwrap(),
                vmpl: u32::from_le_bytes([data[48], data[49], data[50], data[51]]),
                signature_algo: u32::from_le_bytes([data[52], data[53], data[54], data[55]]),
                platform_version: u64::from_le_bytes(data[56..64].try_into().unwrap()),
                platform_info: u64::from_le_bytes(data[64..72].try_into().unwrap()),
                author_key_en: u32::from_le_bytes([data[72], data[73], data[74], data[75]]),
                report_data: data[76..140].try_into().unwrap(),
                measurement: data[140..188].try_into().unwrap(),
                host_data: data[188..220].try_into().unwrap(),
                id_key_digest: data[220..268].try_into().unwrap(),
                author_key_digest: data[268..316].try_into().unwrap(),
                report_id: data[316..348].try_into().unwrap(),
                report_id_ma: data[348..380].try_into().unwrap(),
                reported_tcb: u64::from_le_bytes(data[380..388].try_into().unwrap()),
                chip_id: data[388..452].try_into().unwrap(),
                signature: data[672..1184].try_into().unwrap(),
            })
        }
    }
}

/// TDX attestation quote parser
#[cfg(feature = "cpu-tee")]
pub mod tdx {
    use super::*;

    #[derive(Debug, Clone, Serialize, Deserialize)]
    pub struct TdxQuote {
        pub version: u16,
        pub attestation_key_type: u16,
        pub tee_type: u32,
        pub reserved: [u8; 4],
        pub vendor_id: [u8; 16],
        pub user_data: [u8; 20],
        pub report_data: [u8; 64],
    }

    impl TdxQuote {
        pub fn parse(data: &[u8]) -> Result<Self> {
            if data.len() < 584 {
                return Err(PqcError::AttestationError("Invalid TDX quote size".into()));
            }

            Ok(Self {
                version: u16::from_le_bytes([data[0], data[1]]),
                attestation_key_type: u16::from_le_bytes([data[2], data[3]]),
                tee_type: u32::from_le_bytes([data[4], data[5], data[6], data[7]]),
                reserved: data[8..12].try_into().unwrap(),
                vendor_id: data[12..28].try_into().unwrap(),
                user_data: data[28..48].try_into().unwrap(),
                report_data: data[48..112].try_into().unwrap(),
            })
        }
    }
}