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SIP Protocol

Audit Preparation

Audit Preparation

Section titled “Audit Preparation”

This document outlines the security audit preparation for SIP Protocol.

Audit Scope

Section titled “Audit Scope”

In Scope

Section titled “In Scope”

Cryptographic Primitives

  • Pedersen commitment implementation
  • Stealth address generation and recovery
  • Viewing key derivation and encryption
  • NUMS generator construction

SDK Components

  • packages/sdk/src/crypto.ts - Commitments, hashing
  • packages/sdk/src/stealth.ts - Stealth addresses
  • packages/sdk/src/privacy.ts - Viewing keys, encryption
  • packages/sdk/src/validation.ts - Input validation

Critical Paths

  • Key generation flows
  • Intent creation flow
  • Proof generation (when real proofs implemented)
  • Wallet adapter signing

Out of Scope

Section titled “Out of Scope”
  • Mock implementations (intended for testing only)
  • External dependencies (@noble libraries - already audited)
  • NEAR Intents infrastructure (separate audit)
  • Demo application UI

Code Quality Metrics

Section titled “Code Quality Metrics”
MetricCurrentTarget
Test Coverage89.88%>90%
Passing Tests741/741100%
Type SafetyStrictStrict
Lint Errors00

Security Checklist

Section titled “Security Checklist”

Cryptographic Implementation

Section titled “Cryptographic Implementation”
  • Constant-time operations via @noble/curves
  • NUMS generator deterministically derived
  • Secure random number generation (OS CSPRNG)
  • No custom cryptographic primitives
  • Field element validation
  • Scalar range validation

Key Management

Section titled “Key Management”
  • Private keys never logged
  • Keys validated on import
  • Separate spending and viewing keys
  • Key derivation uses HKDF
  • Secure memory clearing via secureWipe(), withSecureBuffer()

Input Validation

Section titled “Input Validation”
  • Chain ID validation
  • Privacy level validation
  • Hex string format validation
  • Amount validation (positive, within range)
  • Public key format validation
  • Stealth meta-address parsing

Error Handling

Section titled “Error Handling”
  • Typed error classes
  • Error codes for categorization
  • No sensitive data in error messages
  • Graceful degradation

Dependencies

Section titled “Dependencies”

Cryptographic Libraries

Section titled “Cryptographic Libraries”

All noble libraries are Trail of Bits audited:

PackageVersionAudit Status
@noble/curves^1.3.0Audited
@noble/hashes^1.3.3Audited
@noble/ciphers^2.0.1Audited

Other Dependencies

Section titled “Other Dependencies”
PackagePurposeRisk
viemEthereum utilsLow (widely used)
vitestTestingDev only
typescriptBuildDev only

Known Issues

Section titled “Known Issues”

Addressed

Section titled “Addressed”
  1. Generator H construction verified as secure NUMS
  2. Blinding factor non-zero enforcement
  3. Scalar modular reduction
  4. View tag implementation follows EIP-5564

Pending

Section titled “Pending”
  1. Memory clearing in JavaScript (inherent limitation)
  2. Mock proof security (documented as non-production)

Test Coverage

Section titled “Test Coverage”

Unit Tests

Section titled “Unit Tests”
ModuleCoverageTests
crypto.ts95%50
stealth.ts93%40
privacy.ts91%30
validation.ts97%60

Integration Tests

Section titled “Integration Tests”
FlowCoverageTests
Intent creation100%25
Stealth workflow100%15
Viewing key flow100%20

E2E Tests

Section titled “E2E Tests”
ScenarioTests
Cross-chain swap30
Privacy verification25
Compliance flow20
Error scenarios30
Performance23
Section titled “Recommended Audit Focus”

Priority 1: Cryptographic Correctness

Section titled “Priority 1: Cryptographic Correctness”
  1. Pedersen commitment math
  2. ECDH shared secret derivation
  3. Stealth address generation
  4. Scalar/field arithmetic

Priority 2: Key Security

Section titled “Priority 2: Key Security”
  1. Key generation entropy
  2. Key derivation correctness
  3. No key leakage paths
  4. Validation completeness

Priority 3: Protocol Logic

Section titled “Priority 3: Protocol Logic”
  1. Intent construction
  2. Privacy level enforcement
  3. Proof parameter binding
  4. Error paths

Threat Model Summary

Section titled “Threat Model Summary”
ThreatMitigationAudit Focus
Amount disclosurePedersen hidingVerify math
Address linkabilityStealth addressesVerify unlinkability
Key extractionNo logging, validationCheck all paths
Proof forgeryZK verificationCircuit review
Timing attacksConstant-time libsVerify usage

Documentation

Section titled “Documentation”

Available for auditors:

  1. Whitepaper - Protocol specification
  2. SIP Spec - Technical specification
  3. Threat Model - Security model
  4. Architecture - System design

Contact

Section titled “Contact”

For audit coordination:

Audit History

Section titled “Audit History”
DateAuditorScopeStatus
Q1 2025Pending SelectionFull SDK + CircuitsPlanned

Post-Audit Actions

Section titled “Post-Audit Actions”
  1. Address all critical/high findings
  2. Document medium/low findings with rationale
  3. Update this document with findings
  4. Publish audit report