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1 //! Proof-of-storage system for ZephyrFS
2 //!
3 //! Provides cryptographic proofs of data storage without revealing content,
4 //! enabling verification of storage node integrity and data availability.
5
6 use anyhow::{Context, Result};
7 use ring::digest::{Context as DigestContext, SHA256, SHA512};
8 use ring::rand::{SecureRandom, SystemRandom};
9 use serde::{Deserialize, Serialize};
10 use std::collections::HashMap;
11 use std::time::{SystemTime, UNIX_EPOCH};
12 use uuid::Uuid;
13
14 /// Proof-of-storage configuration
15 #[derive(Debug, Clone, Serialize, Deserialize)]
16 pub struct ProofConfig {
17 /// Challenge difficulty (number of random challenges)
18 pub challenge_count: usize,
19 /// Proof validity period (seconds)
20 pub proof_validity_seconds: u64,
21 /// Merkle tree depth for batch proofs
22 pub merkle_tree_depth: usize,
23 /// Enable zero-knowledge proofs
24 pub enable_zk_proofs: bool,
25 /// Minimum chunk sample size for statistical proofs
26 pub min_sample_size: usize,
27 }
28
29 impl Default for ProofConfig {
30 fn default() -> Self {
31 Self {
32 challenge_count: 64,
33 proof_validity_seconds: 1800, // 30 minutes
34 merkle_tree_depth: 20,
35 enable_zk_proofs: true,
36 min_sample_size: 16,
37 }
38 }
39 }
40
41 /// Storage proof challenge
42 #[derive(Debug, Clone, Serialize, Deserialize)]
43 pub struct StorageChallenge {
44 /// Unique challenge identifier
45 pub challenge_id: Uuid,
46 /// Timestamp when challenge was issued
47 pub challenge_timestamp: u64,
48 /// Challenge expiry time
49 pub expiry_timestamp: u64,
50 /// Challenged chunk identifiers
51 pub chunk_ids: Vec<Uuid>,
52 /// Random challenge seeds for each chunk
53 pub challenge_seeds: Vec<[u8; 32]>,
54 /// Additional challenge parameters
55 pub challenge_params: ChallengeParams,
56 }
57
58 /// Parameters for storage challenges
59 #[derive(Debug, Clone, Serialize, Deserialize)]
60 pub struct ChallengeParams {
61 /// Type of proof required
62 pub proof_type: ProofType,
63 /// Statistical sampling parameters
64 pub sampling_params: Option<SamplingParams>,
65 /// Zero-knowledge proof parameters
66 pub zk_params: Option<ZkProofParams>,
67 }
68
69 /// Types of storage proofs
70 #[derive(Debug, Clone, Serialize, Deserialize)]
71 pub enum ProofType {
72 /// Direct cryptographic proof
73 Direct,
74 /// Statistical sampling proof
75 Statistical,
76 /// Zero-knowledge proof
77 ZeroKnowledge,
78 /// Combined multi-layer proof
79 Combined,
80 }
81
82 /// Parameters for statistical sampling
83 #[derive(Debug, Clone, Serialize, Deserialize)]
84 pub struct SamplingParams {
85 /// Sample size for statistical proof
86 pub sample_size: usize,
87 /// Confidence level required (0.0-1.0)
88 pub confidence_level: f64,
89 /// Random sampling seed
90 pub sampling_seed: [u8; 32],
91 }
92
93 /// Parameters for zero-knowledge proofs
94 #[derive(Debug, Clone, Serialize, Deserialize)]
95 pub struct ZkProofParams {
96 /// Commitment scheme identifier
97 pub commitment_scheme: String,
98 /// Proof system identifier
99 pub proof_system: String,
100 /// Circuit parameters
101 pub circuit_params: Vec<u8>,
102 }
103
104 /// Storage proof response
105 #[derive(Debug, Clone, Serialize, Deserialize)]
106 pub struct StorageProof {
107 /// Challenge this proof responds to
108 pub challenge_id: Uuid,
109 /// Proof generation timestamp
110 pub proof_timestamp: u64,
111 /// Node that generated this proof
112 pub prover_node_id: String,
113 /// Cryptographic proofs for each challenged chunk
114 pub chunk_proofs: Vec<ChunkProof>,
115 /// Aggregated proof data
116 pub aggregate_proof: AggregateProof,
117 /// Zero-knowledge proof data (if applicable)
118 pub zk_proof: Option<ZkProofData>,
119 }
120
121 /// Proof for an individual chunk
122 #[derive(Debug, Clone, Serialize, Deserialize)]
123 pub struct ChunkProof {
124 /// Chunk identifier
125 pub chunk_id: Uuid,
126 /// Hash-based proof of possession
127 pub possession_proof: PossessionProof,
128 /// Integrity verification data
129 pub integrity_data: IntegrityData,
130 /// Temporal proof (showing recent access)
131 pub temporal_proof: TemporalProof,
132 }
133
134 /// Proof of chunk possession
135 #[derive(Debug, Clone, Serialize, Deserialize)]
136 pub struct PossessionProof {
137 /// Challenge response hash
138 pub response_hash: Vec<u8>,
139 /// Merkle inclusion proof
140 pub merkle_proof: MerkleInclusionProof,
141 /// Content-blind verification hash
142 pub verification_hash: Vec<u8>,
143 }
144
145 /// Merkle tree inclusion proof
146 #[derive(Debug, Clone, Serialize, Deserialize)]
147 pub struct MerkleInclusionProof {
148 /// Leaf index in the tree
149 pub leaf_index: usize,
150 /// Authentication path
151 pub auth_path: Vec<Vec<u8>>,
152 /// Root hash
153 pub root_hash: Vec<u8>,
154 }
155
156 /// Chunk integrity verification data
157 #[derive(Debug, Clone, Serialize, Deserialize)]
158 pub struct IntegrityData {
159 /// Size verification
160 pub size_proof: u64,
161 /// Checksum verification
162 pub checksum: u32,
163 /// Content fingerprint (without revealing content)
164 pub content_fingerprint: Vec<u8>,
165 }
166
167 /// Temporal proof of recent chunk access
168 #[derive(Debug, Clone, Serialize, Deserialize)]
169 pub struct TemporalProof {
170 /// Last access timestamp
171 pub last_access_timestamp: u64,
172 /// Access frequency indicator
173 pub access_frequency: f64,
174 /// Time-based verification hash
175 pub temporal_hash: Vec<u8>,
176 }
177
178 /// Aggregate proof combining multiple chunks
179 #[derive(Debug, Clone, Serialize, Deserialize)]
180 pub struct AggregateProof {
181 /// Combined possession proof
182 pub combined_possession: Vec<u8>,
183 /// Statistical integrity metrics
184 pub integrity_metrics: IntegrityMetrics,
185 /// Storage utilization proof
186 pub utilization_proof: UtilizationProof,
187 }
188
189 /// Statistical integrity metrics
190 #[derive(Debug, Clone, Serialize, Deserialize)]
191 pub struct IntegrityMetrics {
192 /// Total verified chunks
193 pub verified_chunk_count: u64,
194 /// Average chunk integrity score
195 pub average_integrity_score: f64,
196 /// Corruption detection count
197 pub corruption_count: u64,
198 /// Storage efficiency metrics
199 pub efficiency_metrics: HashMap<String, f64>,
200 }
201
202 /// Storage utilization proof
203 #[derive(Debug, Clone, Serialize, Deserialize)]
204 pub struct UtilizationProof {
205 /// Total storage allocated
206 pub total_storage_bytes: u64,
207 /// Actually used storage
208 pub used_storage_bytes: u64,
209 /// Available storage capacity
210 pub available_storage_bytes: u64,
211 /// Storage utilization ratio
212 pub utilization_ratio: f64,
213 }
214
215 /// Zero-knowledge proof data
216 #[derive(Debug, Clone, Serialize, Deserialize)]
217 pub struct ZkProofData {
218 /// Zero-knowledge proof
219 pub proof: Vec<u8>,
220 /// Public inputs
221 pub public_inputs: Vec<Vec<u8>>,
222 /// Verification key
223 pub verification_key: Vec<u8>,
224 /// Proof metadata
225 pub metadata: HashMap<String, String>,
226 }
227
228 /// Proof verification result
229 #[derive(Debug, Clone)]
230 pub struct ProofVerificationResult {
231 /// Whether proof is valid
232 pub is_valid: bool,
233 /// Confidence score (0.0-1.0)
234 pub confidence_score: f64,
235 /// Individual verification results
236 pub verification_details: VerificationDetails,
237 /// Performance metrics
238 pub verification_metrics: VerificationMetrics,
239 }
240
241 /// Detailed verification results
242 #[derive(Debug, Clone)]
243 pub struct VerificationDetails {
244 /// Possession proof results
245 pub possession_results: HashMap<Uuid, bool>,
246 /// Integrity verification results
247 pub integrity_results: HashMap<Uuid, f64>,
248 /// Temporal proof results
249 pub temporal_results: HashMap<Uuid, bool>,
250 /// Aggregate proof result
251 pub aggregate_result: bool,
252 /// Zero-knowledge proof result
253 pub zk_result: Option<bool>,
254 }
255
256 /// Verification performance metrics
257 #[derive(Debug, Clone)]
258 pub struct VerificationMetrics {
259 /// Verification time (milliseconds)
260 pub verification_time_ms: u64,
261 /// CPU cycles used
262 pub cpu_cycles: Option<u64>,
263 /// Memory usage (bytes)
264 pub memory_usage_bytes: u64,
265 /// Network I/O (bytes)
266 pub network_io_bytes: u64,
267 }
268
269 /// Storage proof system
270 pub struct StorageProofSystem {
271 config: ProofConfig,
272 node_id: String,
273 rng: SystemRandom,
274 }
275
276 impl StorageProofSystem {
277 /// Create new storage proof system
278 pub fn new(config: ProofConfig, node_id: String) -> Self {
279 Self {
280 config,
281 node_id,
282 rng: SystemRandom::new(),
283 }
284 }
285
286 /// Generate a storage challenge for specific chunks
287 pub fn generate_challenge(&self, chunk_ids: Vec<Uuid>) -> Result<StorageChallenge> {
288 let challenge_id = Uuid::new_v4();
289 let current_time = SystemTime::now()
290 .duration_since(UNIX_EPOCH)
291 .context("Failed to get timestamp")?
292 .as_secs();
293
294 let expiry_timestamp = current_time + self.config.proof_validity_seconds;
295
296 // Generate random seeds for each chunk
297 let mut challenge_seeds = Vec::new();
298 for _ in &chunk_ids {
299 let mut seed = [0u8; 32];
300 self.rng.fill(&mut seed)
301 .map_err(|_| anyhow::anyhow!("Failed to generate random seed"))?;
302 challenge_seeds.push(seed);
303 }
304
305 let challenge_params = self.create_challenge_params()?;
306
307 Ok(StorageChallenge {
308 challenge_id,
309 challenge_timestamp: current_time,
310 expiry_timestamp,
311 chunk_ids,
312 challenge_seeds,
313 challenge_params,
314 })
315 }
316
317 /// Generate storage proof response for a challenge
318 pub async fn generate_proof(
319 &self,
320 challenge: &StorageChallenge,
321 chunk_data_accessor: &dyn ChunkDataAccessor,
322 ) -> Result<StorageProof> {
323 // Verify challenge hasn't expired
324 let current_time = SystemTime::now()
325 .duration_since(UNIX_EPOCH)
326 .context("Failed to get timestamp")?
327 .as_secs();
328
329 if current_time > challenge.expiry_timestamp {
330 return Err(anyhow::anyhow!("Challenge has expired"));
331 }
332
333 let proof_timestamp = current_time;
334
335 // Generate individual chunk proofs
336 let mut chunk_proofs = Vec::new();
337 for (i, chunk_id) in challenge.chunk_ids.iter().enumerate() {
338 let chunk_proof = self.generate_chunk_proof(
339 *chunk_id,
340 &challenge.challenge_seeds[i],
341 chunk_data_accessor,
342 ).await?;
343 chunk_proofs.push(chunk_proof);
344 }
345
346 // Generate aggregate proof
347 let aggregate_proof = self.generate_aggregate_proof(&chunk_proofs, chunk_data_accessor).await?;
348
349 // Generate zero-knowledge proof if enabled
350 let zk_proof = if self.config.enable_zk_proofs {
351 Some(self.generate_zk_proof(&challenge, &chunk_proofs).await?)
352 } else {
353 None
354 };
355
356 Ok(StorageProof {
357 challenge_id: challenge.challenge_id,
358 proof_timestamp,
359 prover_node_id: self.node_id.clone(),
360 chunk_proofs,
361 aggregate_proof,
362 zk_proof,
363 })
364 }
365
366 /// Verify a storage proof against a challenge
367 pub async fn verify_proof(
368 &self,
369 challenge: &StorageChallenge,
370 proof: &StorageProof,
371 ) -> Result<ProofVerificationResult> {
372 let start_time = SystemTime::now();
373
374 // Basic validation
375 if proof.challenge_id != challenge.challenge_id {
376 return Ok(ProofVerificationResult {
377 is_valid: false,
378 confidence_score: 0.0,
379 verification_details: VerificationDetails {
380 possession_results: HashMap::new(),
381 integrity_results: HashMap::new(),
382 temporal_results: HashMap::new(),
383 aggregate_result: false,
384 zk_result: Some(false),
385 },
386 verification_metrics: VerificationMetrics {
387 verification_time_ms: 0,
388 cpu_cycles: None,
389 memory_usage_bytes: 0,
390 network_io_bytes: 0,
391 },
392 });
393 }
394
395 // Verify individual chunk proofs
396 let mut possession_results = HashMap::new();
397 let mut integrity_results = HashMap::new();
398 let mut temporal_results = HashMap::new();
399
400 for (i, chunk_proof) in proof.chunk_proofs.iter().enumerate() {
401 let chunk_id = chunk_proof.chunk_id;
402 let seed = &challenge.challenge_seeds[i];
403
404 // Verify possession proof
405 let possession_valid = self.verify_possession_proof(
406 &chunk_proof.possession_proof,
407 chunk_id,
408 seed,
409 ).await?;
410 possession_results.insert(chunk_id, possession_valid);
411
412 // Verify integrity data
413 let integrity_score = self.verify_integrity_data(&chunk_proof.integrity_data).await?;
414 integrity_results.insert(chunk_id, integrity_score);
415
416 // Verify temporal proof
417 let temporal_valid = self.verify_temporal_proof(&chunk_proof.temporal_proof).await?;
418 temporal_results.insert(chunk_id, temporal_valid);
419 }
420
421 // Verify aggregate proof
422 let aggregate_result = self.verify_aggregate_proof(&proof.aggregate_proof).await?;
423
424 // Verify zero-knowledge proof if present
425 let zk_result = if let Some(zk_proof) = &proof.zk_proof {
426 Some(self.verify_zk_proof(zk_proof, challenge).await?)
427 } else {
428 None
429 };
430
431 // Calculate overall confidence score
432 let confidence_score = self.calculate_confidence_score(
433 &possession_results,
434 &integrity_results,
435 &temporal_results,
436 aggregate_result,
437 zk_result,
438 );
439
440 let is_valid = confidence_score >= 0.8; // 80% confidence threshold
441
442 let verification_time = SystemTime::now()
443 .duration_since(start_time)
444 .unwrap_or_default()
445 .as_millis() as u64;
446
447 Ok(ProofVerificationResult {
448 is_valid,
449 confidence_score,
450 verification_details: VerificationDetails {
451 possession_results,
452 integrity_results,
453 temporal_results,
454 aggregate_result,
455 zk_result,
456 },
457 verification_metrics: VerificationMetrics {
458 verification_time_ms: verification_time,
459 cpu_cycles: None, // Would need platform-specific implementation
460 memory_usage_bytes: 0, // Would need memory tracking
461 network_io_bytes: 0,
462 },
463 })
464 }
465
466 /// Create challenge parameters based on configuration
467 fn create_challenge_params(&self) -> Result<ChallengeParams> {
468 let proof_type = if self.config.enable_zk_proofs {
469 ProofType::Combined
470 } else {
471 ProofType::Statistical
472 };
473
474 let sampling_params = Some(SamplingParams {
475 sample_size: self.config.min_sample_size,
476 confidence_level: 0.95,
477 sampling_seed: {
478 let mut seed = [0u8; 32];
479 self.rng.fill(&mut seed)
480 .map_err(|_| anyhow::anyhow!("Failed to generate sampling seed"))?;
481 seed
482 },
483 });
484
485 let zk_params = if self.config.enable_zk_proofs {
486 Some(ZkProofParams {
487 commitment_scheme: "Pedersen".to_string(),
488 proof_system: "PLONK".to_string(),
489 circuit_params: vec![], // Would contain actual circuit parameters
490 })
491 } else {
492 None
493 };
494
495 Ok(ChallengeParams {
496 proof_type,
497 sampling_params,
498 zk_params,
499 })
500 }
501
502 /// Generate proof for an individual chunk
503 async fn generate_chunk_proof(
504 &self,
505 chunk_id: Uuid,
506 challenge_seed: &[u8; 32],
507 accessor: &dyn ChunkDataAccessor,
508 ) -> Result<ChunkProof> {
509 // Get encrypted chunk metadata (not the actual content)
510 let chunk_metadata = accessor.get_chunk_metadata(chunk_id).await?;
511
512 // Generate possession proof
513 let possession_proof = self.generate_possession_proof(
514 chunk_id,
515 challenge_seed,
516 &chunk_metadata,
517 )?;
518
519 // Generate integrity data
520 let integrity_data = self.generate_integrity_data(&chunk_metadata)?;
521
522 // Generate temporal proof
523 let temporal_proof = self.generate_temporal_proof(chunk_id, accessor).await?;
524
525 Ok(ChunkProof {
526 chunk_id,
527 possession_proof,
528 integrity_data,
529 temporal_proof,
530 })
531 }
532
533 /// Generate possession proof for a chunk
534 fn generate_possession_proof(
535 &self,
536 chunk_id: Uuid,
537 challenge_seed: &[u8; 32],
538 metadata: &ChunkMetadata,
539 ) -> Result<PossessionProof> {
540 // Create challenge response hash
541 let mut context = DigestContext::new(&SHA256);
542 context.update(chunk_id.as_bytes());
543 context.update(challenge_seed);
544 context.update(&metadata.content_hash);
545 context.update(&metadata.size.to_le_bytes());
546 let response_hash = context.finish().as_ref().to_vec();
547
548 // Generate Merkle inclusion proof (simplified)
549 let merkle_proof = MerkleInclusionProof {
550 leaf_index: 0, // Would be actual leaf index
551 auth_path: vec![], // Would contain actual authentication path
552 root_hash: metadata.merkle_root.clone(),
553 };
554
555 // Generate verification hash without revealing content
556 let mut verification_context = DigestContext::new(&SHA512);
557 verification_context.update(&response_hash);
558 verification_context.update(&metadata.encryption_key_fingerprint);
559 let verification_hash = verification_context.finish().as_ref().to_vec();
560
561 Ok(PossessionProof {
562 response_hash,
563 merkle_proof,
564 verification_hash,
565 })
566 }
567
568 /// Generate integrity data for a chunk
569 fn generate_integrity_data(&self, metadata: &ChunkMetadata) -> Result<IntegrityData> {
570 // Size proof
571 let size_proof = metadata.size;
572
573 // Checksum
574 let checksum = metadata.checksum;
575
576 // Content fingerprint without revealing actual content
577 let mut fingerprint_context = DigestContext::new(&SHA256);
578 fingerprint_context.update(&metadata.content_hash);
579 fingerprint_context.update(&metadata.creation_timestamp.to_le_bytes());
580 let content_fingerprint = fingerprint_context.finish().as_ref().to_vec();
581
582 Ok(IntegrityData {
583 size_proof,
584 checksum,
585 content_fingerprint,
586 })
587 }
588
589 /// Generate temporal proof for recent access
590 async fn generate_temporal_proof(
591 &self,
592 chunk_id: Uuid,
593 accessor: &dyn ChunkDataAccessor,
594 ) -> Result<TemporalProof> {
595 let access_stats = accessor.get_access_stats(chunk_id).await?;
596
597 let current_time = SystemTime::now()
598 .duration_since(UNIX_EPOCH)
599 .context("Failed to get timestamp")?
600 .as_secs();
601
602 // Generate time-based verification hash
603 let mut temporal_context = DigestContext::new(&SHA256);
604 temporal_context.update(chunk_id.as_bytes());
605 temporal_context.update(&current_time.to_le_bytes());
606 temporal_context.update(&access_stats.last_access_timestamp.to_le_bytes());
607 let temporal_hash = temporal_context.finish().as_ref().to_vec();
608
609 Ok(TemporalProof {
610 last_access_timestamp: access_stats.last_access_timestamp,
611 access_frequency: access_stats.access_frequency,
612 temporal_hash,
613 })
614 }
615
616 /// Generate aggregate proof combining multiple chunks
617 async fn generate_aggregate_proof(
618 &self,
619 chunk_proofs: &[ChunkProof],
620 accessor: &dyn ChunkDataAccessor,
621 ) -> Result<AggregateProof> {
622 // Combine possession proofs
623 let mut combined_context = DigestContext::new(&SHA256);
624 for chunk_proof in chunk_proofs {
625 combined_context.update(&chunk_proof.possession_proof.response_hash);
626 }
627 let combined_possession = combined_context.finish().as_ref().to_vec();
628
629 // Calculate integrity metrics
630 let verified_chunk_count = chunk_proofs.len() as u64;
631 let total_integrity_score: f64 = chunk_proofs.iter()
632 .map(|_| 1.0) // Simplified - would calculate actual scores
633 .sum();
634 let average_integrity_score = total_integrity_score / verified_chunk_count as f64;
635
636 let integrity_metrics = IntegrityMetrics {
637 verified_chunk_count,
638 average_integrity_score,
639 corruption_count: 0, // Would be calculated from actual data
640 efficiency_metrics: HashMap::new(),
641 };
642
643 // Generate utilization proof
644 let storage_stats = accessor.get_storage_stats().await?;
645 let utilization_proof = UtilizationProof {
646 total_storage_bytes: storage_stats.total_storage_bytes,
647 used_storage_bytes: storage_stats.used_storage_bytes,
648 available_storage_bytes: storage_stats.available_storage_bytes,
649 utilization_ratio: storage_stats.used_storage_bytes as f64 / storage_stats.total_storage_bytes as f64,
650 };
651
652 Ok(AggregateProof {
653 combined_possession,
654 integrity_metrics,
655 utilization_proof,
656 })
657 }
658
659 /// Generate zero-knowledge proof
660 async fn generate_zk_proof(
661 &self,
662 challenge: &StorageChallenge,
663 chunk_proofs: &[ChunkProof],
664 ) -> Result<ZkProofData> {
665 // Simplified ZK proof generation
666 // In a real implementation, this would use a ZK-SNARK library
667
668 let mut proof_context = DigestContext::new(&SHA256);
669 proof_context.update(challenge.challenge_id.as_bytes());
670
671 for chunk_proof in chunk_proofs {
672 proof_context.update(&chunk_proof.possession_proof.response_hash);
673 }
674
675 let proof = proof_context.finish().as_ref().to_vec();
676
677 Ok(ZkProofData {
678 proof,
679 public_inputs: vec![challenge.challenge_id.as_bytes().to_vec()],
680 verification_key: vec![], // Would contain actual verification key
681 metadata: HashMap::new(),
682 })
683 }
684
685 /// Verify possession proof
686 async fn verify_possession_proof(
687 &self,
688 proof: &PossessionProof,
689 chunk_id: Uuid,
690 seed: &[u8; 32],
691 ) -> Result<bool> {
692 // In a real implementation, this would verify the Merkle proof
693 // and check the response hash validity
694 Ok(!proof.response_hash.is_empty() && !proof.verification_hash.is_empty())
695 }
696
697 /// Verify integrity data
698 async fn verify_integrity_data(&self, _integrity: &IntegrityData) -> Result<f64> {
699 // Simplified integrity verification
700 // Would perform actual integrity checks
701 Ok(1.0) // Perfect integrity score
702 }
703
704 /// Verify temporal proof
705 async fn verify_temporal_proof(&self, _temporal: &TemporalProof) -> Result<bool> {
706 // Simplified temporal verification
707 // Would check timestamp validity and access patterns
708 Ok(true)
709 }
710
711 /// Verify aggregate proof
712 async fn verify_aggregate_proof(&self, _aggregate: &AggregateProof) -> Result<bool> {
713 // Simplified aggregate verification
714 // Would verify combined proofs and metrics
715 Ok(true)
716 }
717
718 /// Verify zero-knowledge proof
719 async fn verify_zk_proof(
720 &self,
721 _zk_proof: &ZkProofData,
722 _challenge: &StorageChallenge,
723 ) -> Result<bool> {
724 // Simplified ZK verification
725 // Would use actual ZK verification algorithms
726 Ok(true)
727 }
728
729 /// Calculate overall confidence score
730 fn calculate_confidence_score(
731 &self,
732 possession_results: &HashMap<Uuid, bool>,
733 integrity_results: &HashMap<Uuid, f64>,
734 temporal_results: &HashMap<Uuid, bool>,
735 aggregate_result: bool,
736 zk_result: Option<bool>,
737 ) -> f64 {
738 let possession_score = possession_results.values().filter(|&&v| v).count() as f64
739 / possession_results.len().max(1) as f64;
740
741 let integrity_score = integrity_results.values().sum::<f64>()
742 / integrity_results.len().max(1) as f64;
743
744 let temporal_score = temporal_results.values().filter(|&&v| v).count() as f64
745 / temporal_results.len().max(1) as f64;
746
747 let aggregate_score = if aggregate_result { 1.0 } else { 0.0 };
748
749 let zk_score = match zk_result {
750 Some(true) => 1.0,
751 Some(false) => 0.0,
752 None => 0.8, // Neutral score when ZK proofs not used
753 };
754
755 // Weighted average
756 (possession_score * 0.3 + integrity_score * 0.25 + temporal_score * 0.2
757 + aggregate_score * 0.15 + zk_score * 0.1)
758 }
759 }
760
761 /// Trait for accessing chunk data without revealing content
762 #[async_trait::async_trait]
763 pub trait ChunkDataAccessor: Send + Sync {
764 /// Get chunk metadata without revealing content
765 async fn get_chunk_metadata(&self, chunk_id: Uuid) -> Result<ChunkMetadata>;
766
767 /// Get access statistics for a chunk
768 async fn get_access_stats(&self, chunk_id: Uuid) -> Result<ChunkAccessStats>;
769
770 /// Get overall storage statistics
771 async fn get_storage_stats(&self) -> Result<StorageStats>;
772 }
773
774 /// Chunk metadata for proof generation
775 #[derive(Debug, Clone)]
776 pub struct ChunkMetadata {
777 pub chunk_id: Uuid,
778 pub size: u64,
779 pub content_hash: Vec<u8>,
780 pub merkle_root: Vec<u8>,
781 pub encryption_key_fingerprint: Vec<u8>,
782 pub creation_timestamp: u64,
783 pub checksum: u32,
784 }
785
786 /// Chunk access statistics
787 #[derive(Debug, Clone)]
788 pub struct ChunkAccessStats {
789 pub last_access_timestamp: u64,
790 pub access_count: u64,
791 pub access_frequency: f64,
792 }
793
794 /// Overall storage statistics
795 #[derive(Debug, Clone)]
796 pub struct StorageStats {
797 pub total_storage_bytes: u64,
798 pub used_storage_bytes: u64,
799 pub available_storage_bytes: u64,
800 pub chunk_count: u64,
801 }
802
803 #[cfg(test)]
804 mod tests {
805 use super::*;
806
807 /// Mock chunk data accessor for testing
808 struct MockChunkDataAccessor;
809
810 #[async_trait::async_trait]
811 impl ChunkDataAccessor for MockChunkDataAccessor {
812 async fn get_chunk_metadata(&self, chunk_id: Uuid) -> Result<ChunkMetadata> {
813 Ok(ChunkMetadata {
814 chunk_id,
815 size: 1024,
816 content_hash: vec![1, 2, 3, 4],
817 merkle_root: vec![5, 6, 7, 8],
818 encryption_key_fingerprint: vec![9, 10, 11, 12],
819 creation_timestamp: 1234567890,
820 checksum: 0x12345678,
821 })
822 }
823
824 async fn get_access_stats(&self, _chunk_id: Uuid) -> Result<ChunkAccessStats> {
825 Ok(ChunkAccessStats {
826 last_access_timestamp: 1234567890,
827 access_count: 10,
828 access_frequency: 0.5,
829 })
830 }
831
832 async fn get_storage_stats(&self) -> Result<StorageStats> {
833 Ok(StorageStats {
834 total_storage_bytes: 1000000,
835 used_storage_bytes: 750000,
836 available_storage_bytes: 250000,
837 chunk_count: 100,
838 })
839 }
840 }
841
842 #[tokio::test]
843 async fn test_storage_proof_generation() -> Result<()> {
844 let config = ProofConfig::default();
845 let proof_system = StorageProofSystem::new(config, "test-node".to_string());
846 let accessor = MockChunkDataAccessor;
847
848 let chunk_ids = vec![Uuid::new_v4(), Uuid::new_v4()];
849 let challenge = proof_system.generate_challenge(chunk_ids)?;
850
851 let proof = proof_system.generate_proof(&challenge, &accessor).await?;
852
853 assert_eq!(proof.challenge_id, challenge.challenge_id);
854 assert_eq!(proof.chunk_proofs.len(), challenge.chunk_ids.len());
855
856 Ok(())
857 }
858
859 #[tokio::test]
860 async fn test_proof_verification() -> Result<()> {
861 let config = ProofConfig::default();
862 let proof_system = StorageProofSystem::new(config, "test-node".to_string());
863 let accessor = MockChunkDataAccessor;
864
865 let chunk_ids = vec![Uuid::new_v4()];
866 let challenge = proof_system.generate_challenge(chunk_ids)?;
867 let proof = proof_system.generate_proof(&challenge, &accessor).await?;
868
869 let verification_result = proof_system.verify_proof(&challenge, &proof).await?;
870
871 assert!(verification_result.is_valid);
872 assert!(verification_result.confidence_score > 0.5);
873
874 Ok(())
875 }
876 }