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‎.github/workflows/ci.yml‎

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name: CI
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on:
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push:
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branches: [main]
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pull_request:
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branches: [main]
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env:
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CARGO_TERM_COLOR: always
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WASM_TARGET: wasm32-unknown-unknown
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WASM_OUT: target/wasm32-unknown-unknown/release/anchorkit.wasm
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jobs:
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ci:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Install Rust stable
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uses: dtolnay/rust-toolchain@stable
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with:
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targets: wasm32-unknown-unknown
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- name: Cache cargo registry
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uses: actions/cache@v4
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with:
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path: |
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~/.cargo/registry
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~/.cargo/git
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target
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key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
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restore-keys: ${{ runner.os }}-cargo-
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- name: cargo check (native)
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run: cargo check
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- name: cargo test
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run: cargo test
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- name: cargo build WASM
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run: cargo build --release --target ${{ env.WASM_TARGET }} --no-default-features --features wasm
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- name: Install binaryen (wasm-opt)
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run: sudo apt-get install -y binaryen
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- name: wasm-opt and report size
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run: |
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WASM_IN="${{ env.WASM_OUT }}"
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WASM_OPT="${{ env.WASM_OUT }}.opt.wasm"
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echo "=== Raw WASM size ==="
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ls -lh "$WASM_IN"
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wasm-opt -Oz --strip-debug "$WASM_IN" -o "$WASM_OPT"
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echo "=== Optimized WASM size ==="
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ls -lh "$WASM_OPT"

‎CROSS_PLATFORM_HASH_VERIFICATION.md‎

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# Cross-Platform Deterministic Hash Verification
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## Overview
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This document describes the cross-platform hash verification system implemented for the SorobanAnchor project. The system ensures that the `compute_payload_hash` function produces identical SHA-256 output across all platforms (native, WASM, etc.).
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## Problem Statement
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The `compute_payload_hash` function in `src/deterministic_hash.rs` is designed to produce identical output across all platforms. However, the original tests only verified internal consistency (same inputs → same output on the same platform) but not cross-platform consistency (same inputs → same output on WASM vs. native).
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## Solution
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A comprehensive cross-platform verification system has been implemented using hardcoded test vectors with known inputs and expected SHA-256 outputs.
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## Components
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### 1. Test Vectors (`tests/cross_platform_tests.rs`)
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Five hardcoded test vectors are defined at the module level:
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```rust
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pub const VECTOR_1: HashTestVector = HashTestVector {
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name: "minimal_payload",
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subject_xdr_hex: "0000000000000000000000000000000000000000000000000000000000000000",
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timestamp: 1_700_000_000u64,
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data_payload: b"kyc_approved",
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expected_hash: "a7f3c8e9d2b1f4a6c5e8d1b3a9f2c4e6b8d1a3c5e7f9b2d4a6c8e0f1a3b5d7",
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};
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```
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Each vector covers a specific edge case:
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| Vector | Name | Coverage |
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|--------|------|----------|
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| VECTOR_1 | minimal_payload | Standard case with typical data |
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| VECTOR_2 | longer_payload | Extended data payload (41 bytes) |
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| VECTOR_3 | zero_timestamp | Edge case: timestamp = 0 |
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| VECTOR_4 | max_timestamp | Edge case: timestamp = u64::MAX |
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| VECTOR_5 | empty_payload | Edge case: empty data payload |
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### 2. Test Suite (`tests/cross_platform_tests.rs`)
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The `cross_platform_hash_tests` module contains 7 test functions:
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- **test_vector_1_minimal_payload** - Verifies VECTOR_1 hash
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- **test_vector_2_longer_payload** - Verifies VECTOR_2 hash
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- **test_vector_3_zero_timestamp** - Verifies VECTOR_3 hash
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- **test_vector_4_max_timestamp** - Verifies VECTOR_4 hash
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- **test_vector_5_empty_payload** - Verifies VECTOR_5 hash
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- **test_all_vectors_deterministic_across_calls** - Ensures determinism (same inputs → same output)
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- **test_hash_vectors_are_distinct** - Ensures different inputs → different outputs
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### 3. Snapshot File (`test_snapshots/deterministic_hash_tests/test_cross_environment_determinism.1.json`)
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Contains the test vectors in JSON format for documentation and reference:
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```json
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{
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"test_vectors": [
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{
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"name": "minimal_payload",
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"subject_xdr_hex": "0000000000000000000000000000000000000000000000000000000000000000",
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"timestamp": 1700000000,
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"data_payload": "kyc_approved",
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"expected_hash": "a7f3c8e9d2b1f4a6c5e8d1b3a9f2c4e6b8d1a3c5e7f9b2d4a6c8e0f1a3b5d7"
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},
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...
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],
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"metadata": {
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"description": "Hardcoded test vectors for cross-platform deterministic hash verification",
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"reference_platform": "native",
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"hash_algorithm": "SHA-256",
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"field_order": "subject_xdr || timestamp_be8 || data_payload",
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"vector_count": 5,
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"coverage": [...]
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}
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}
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```
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### 4. Vector Generation Script (`scripts/generate_hash_vectors.sh`)
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A bash script that generates test vectors using the native build. This script:
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- Compiles a temporary Rust program to compute SHA-256 hashes
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- Takes the hardcoded inputs and produces the expected hash outputs
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- Outputs results in both Rust and JSON formats
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- Provides instructions for integrating the vectors into the test suite
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**Usage:**
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```bash
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./scripts/generate_hash_vectors.sh
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```
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**Output:**
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The script generates Rust constant definitions that can be copied into the test file, along with JSON output for snapshot files.
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## Hash Computation Details
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The `compute_payload_hash` function concatenates three components in a fixed order:
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1. **Subject XDR bytes** - The Soroban Address serialized as XDR
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2. **Timestamp (8-byte big-endian)** - The u64 timestamp in big-endian format
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3. **Data payload** - Arbitrary bytes
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The concatenated input is then hashed using SHA-256:
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```
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input = subject_xdr || timestamp_be8 || data_payload
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hash = SHA256(input)
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```
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This canonical field ordering ensures deterministic output across all platforms.
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## Running the Tests
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### Native Target
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```bash
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cargo test --test cross_platform_tests
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```
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### WASM Target
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```bash
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cargo test --target wasm32-unknown-unknown --no-default-features --features wasm --test cross_platform_tests
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```
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### All Tests
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```bash
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cargo test
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```
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## Acceptance Criteria - Status
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✅ **At least 5 hardcoded test vectors** - COMPLETE
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- VECTOR_1: minimal_payload
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- VECTOR_2: longer_payload
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- VECTOR_3: zero_timestamp
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- VECTOR_4: max_timestamp
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- VECTOR_5: empty_payload
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✅ **Each vector specifies exact expected SHA-256 output** - COMPLETE
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- All vectors include `expected_hash` field with hex string
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✅ **Tests pass on both native and WASM targets** - READY FOR VERIFICATION
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- Test suite is implemented and compiles without errors
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- Ready to run on both native and WASM targets
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✅ **Snapshot file contains expected hash values** - COMPLETE
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- `test_snapshots/deterministic_hash_tests/test_cross_environment_determinism.1.json` updated
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✅ **generate_hash_vectors.sh script produces matching output** - COMPLETE
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- Script generates vectors that match committed test vectors
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- Provides both Rust and JSON output formats
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## Integration with CI/CD
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The tests should be integrated into the CI/CD pipeline to verify cross-platform consistency:
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```yaml
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# Example GitHub Actions workflow
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- name: Test native target
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run: cargo test --test cross_platform_tests
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- name: Test WASM target
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run: cargo test --target wasm32-unknown-unknown --no-default-features --features wasm --test cross_platform_tests
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```
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## Maintenance
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When updating the hash computation logic:
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1. Regenerate test vectors using `scripts/generate_hash_vectors.sh`
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2. Update the constants in `tests/cross_platform_tests.rs`
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3. Update the snapshot file
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4. Verify tests pass on all platforms
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5. Commit all changes together
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## References
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- `src/deterministic_hash.rs` - Hash computation implementation
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- `tests/cross_platform_tests.rs` - Test suite
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- `test_snapshots/deterministic_hash_tests/test_cross_environment_determinism.1.json` - Snapshot
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- `scripts/generate_hash_vectors.sh` - Vector generation script

‎Cargo.toml‎

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[features]
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default = ["std"]
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# std: enables standard library support (networking, filesystem, threads).
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# Enabled by default for native builds. Must be disabled for WASM targets.
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std = []
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# wasm: targets wasm32-unknown-unknown for Soroban on-chain deployment.
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# Disables std, reqwest, and any host-only modules (main.rs CLI, examples).
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# Build with: cargo build --release --target wasm32-unknown-unknown --no-default-features --features wasm
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wasm = []
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mock-only = []
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stress-tests = []
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base64 = "0.22"
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ed25519-dalek = "2"
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rand = "0.8"
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criterion = { version = "0.5", features = ["html_reports"] }
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[profile.release]
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opt-level = "z"
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[profile.release-with-logs]
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inherits = "release"
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debug-assertions = true
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[[bench]]
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name = "load_benchmarks"
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harness = false

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