# Development Team Handoff - Issues Found During Unit Testing

## Status: 🔴 CRITICAL ISSUES FOUND + 🟡 MISSING FEATURES

Last updated: 2025-12-06 14:50

This document tracks issues found during unit test development that need to be fixed by the development team.

---

## Issue #1: Padding Scheme Bugs (CRITICAL)

**Priority**: P0 - Critical
**Status**: ❌ Blocking Tests
**File**: `sm_py_bc/crypto/paddings/pkcs7_padding.py`, `sm_py_bc/crypto/paddings/iso7816d4_padding.py`

### Description
The padding schemes have critical bugs that cause tests to fail. Tests were created but are blocked by implementation issues.

### Problems Found

1. **PKCS7Padding.add_padding()**: Incorrect padding byte calculation
   - Current: Uses `block_size - len` but `len` is wrong variable
   - Expected: Should use remaining space in block
   - Impact: 19/19 tests fail

2. **ISO7816d4Padding.add_padding()**: Similar issue
   - Current: Incorrect padding logic
   - Expected: First byte should be 0x80, rest 0x00
   - Impact: Tests fail

3. **TBCPadding**: Not implemented at all
   - Status: Missing class
   - Impact: Cannot test

### Test Files Created (Blocked)
- `tests/unit/test_padding_schemes.py` - 23 tests (aligned with JS)
- All tests fail due to implementation bugs

### Reference Implementation
- JS implementation: `sm-js-bc/src/crypto/paddings/*.ts`
- JS tests: `sm-js-bc/test/unit/crypto/paddings/*.test.ts`

### Recommendation
1. Fix PKCS7Padding.add_padding() logic
2. Fix ISO7816d4Padding.add_padding() logic
3. Implement TBCPadding class
4. Run tests to verify fixes: `pytest tests/unit/test_padding_schemes.py -v`

---

## Issue #2: Performance Tests Included in Unit Tests

**Priority**: P1 - High
**Status**: ⚠️ Fixed (tests marked with @pytest.mark.performance)
**File**: Multiple test files

### Description
Performance benchmark tests were mixed with unit tests, making test suite slow.

### Solution Implemented
All performance tests have been marked with `@pytest.mark.performance` and are excluded from regular test runs by default via `pyproject.toml`:

```toml
[tool.pytest.ini_options]
markers = [
    "performance: marks tests as performance benchmarks (deselected by default)"
]
addopts = "-m 'not performance'"
```

### Affected Files
- `tests/unit/math/test_ec_multiplier.py`
- `tests/unit/util/test_big_integers.py`
- `tests/unit/util/test_integers.py`
- `tests/unit/util/test_pack.py`
- Future performance tests

### To Run Performance Tests
```bash
pytest -m performance -v
```

### Status
✅ RESOLVED - All performance tests properly marked and excluded

---

## Issue #3: Missing Crypto Params Classes

**Priority**: P2 - Important (needed for full API compatibility)
**Status**: ❌ Not Implemented
**File**: `sm_py_bc/crypto/params/` (directory and classes don't exist)

### Description
The following classes from sm-js-bc are not implemented in Python:
- `ECDomainParameters`
- `ECPublicKeyParameters`
- `ECPrivateKeyParameters`

These classes are used in sm-js-bc to encapsulate elliptic curve parameters and keys.

### Expected Behavior (from JS implementation)
1. **ECDomainParameters**: Should encapsulate curve parameters (curve, G, n, h, optional seed)
2. **ECPublicKeyParameters**: Should encapsulate public key (Q point) with domain parameters
3. **ECPrivateKeyParameters**: Should encapsulate private key (d scalar) with domain parameters

### Current Behavior
- Directory `sm_py_bc/crypto/params/` doesn't exist
- No parameter wrapper classes implemented
- Current code likely passes raw values instead of parameter objects

### Impact
- API incompatibility with JS version
- Less type safety
- Cannot align tests for:
  - `tests/unit/crypto/params/test_ec_domain_parameters.py` (created, 10 tests - BLOCKED)
  - `tests/unit/crypto/params/test_ec_key_parameters.py` (created, 11 tests - BLOCKED)

### Reference Implementation
- JS: `sm-js-bc/src/crypto/params/ECDomainParameters.ts`
- JS: `sm-js-bc/src/crypto/params/ECPublicKeyParameters.ts`
- JS: `sm-js-bc/src/crypto/params/ECPrivateKeyParameters.ts`
- JS: `sm-js-bc/src/crypto/params/AsymmetricKeyParameter.ts`
- JS Tests: `sm-js-bc/test/unit/crypto/params/*.test.ts`

### Recommendation
Create the params classes following the JS structure:

```python
# sm_py_bc/crypto/params/__init__.py
from .ec_domain_parameters import ECDomainParameters
from .ec_public_key_parameters import ECPublicKeyParameters
from .ec_private_key_parameters import ECPrivateKeyParameters
from .asymmetric_key_parameter import AsymmetricKeyParameter

# sm_py_bc/crypto/params/ec_domain_parameters.py
class ECDomainParameters:
    def __init__(self, curve, G, n, h=1, seed=None):
        self._curve = curve
        self._G = G
        self._n = n
        self._h = h
        self._seed = seed
    
    def get_curve(self): return self._curve
    def get_G(self): return self._G
    def get_n(self): return self._n
    def get_h(self): return self._h
    def get_seed(self): return self._seed
    
    def equals(self, other):
        if not isinstance(other, ECDomainParameters):
            return False
        return (self._curve == other._curve and 
                self._G.equals(other._G) and
                self._n == other._n and
                self._h == other._h)
    
    def hash_code(self):
        h = hash(self._curve)
        h ^= hash(self._G)
        h ^= hash(self._n)
        h ^= hash(self._h)
        return h

# sm_py_bc/crypto/params/asymmetric_key_parameter.py
class AsymmetricKeyParameter:
    def __init__(self, is_private):
        self._is_private = is_private
    
    def is_private(self):
        return self._is_private

# sm_py_bc/crypto/params/ec_key_parameters.py
class ECKeyParameters(AsymmetricKeyParameter):
    def __init__(self, is_private, parameters):
        super().__init__(is_private)
        self._parameters = parameters
    
    def get_parameters(self):
        return self._parameters

# sm_py_bc/crypto/params/ec_public_key_parameters.py
class ECPublicKeyParameters(ECKeyParameters):
    def __init__(self, Q, parameters):
        super().__init__(False, parameters)
        self._Q = Q
    
    def get_Q(self):
        return self._Q

# sm_py_bc/crypto/params/ec_private_key_parameters.py
class ECPrivateKeyParameters(ECKeyParameters):
    def __init__(self, d, parameters):
        super().__init__(True, parameters)
        self._d = d
    
    def get_d(self):
        return self._d
```

---

## Issue #4: Missing GCMUtil Test Coverage

**Priority**: P2 - Important
**Status**: ⚠️ Needs Implementation
**File**: `sm_py_bc/crypto/modes/gcm/` (possibly gcm_util.py)

### Description
JS version has comprehensive GCMUtil tests (`sm-js-bc/test/unit/crypto/modes/gcm/GCMUtil.test.ts`) but Python version doesn't have equivalent tests or possibly the utility class itself.

### Impact
- Missing test coverage for GCM utility functions
- Possible missing utility functions

### Recommendation
1. Check if `gcm_util.py` exists and what functions it has
2. Create `tests/unit/crypto/modes/gcm/test_gcm_util.py` aligned with JS tests
3. Implement any missing utility functions

---

## Next Steps for Development Team

### Immediate Actions (P0 - Critical)
1. ❌ **Fix padding scheme bugs** (Issue #1)
   - Fix PKCS7Padding.add_padding() and pad_count()
   - Fix ISO7816d4Padding implementation
   - Implement TBCPadding
   - Run: `pytest tests/unit/test_padding_schemes.py -v`

### High Priority (P1)
2. ✅ **Performance tests** (Issue #2) - COMPLETED

### Important for API Compatibility (P2)
3. ❌ **Implement params classes** (Issue #3)
   - Create `sm_py_bc/crypto/params/` directory
   - Implement AsymmetricKeyParameter base class
   - Implement ECDomainParameters
   - Implement ECPublicKeyParameters and ECPrivateKeyParameters
   - Run: `pytest tests/unit/crypto/params/ -v`

4. ⚠️ **Check GCMUtil coverage** (Issue #4)
   - Review JS GCMUtil.test.ts
   - Create Python equivalent tests

---

## Test Alignment Status Summary

### ✅ Completed & Passing
- Core SM2/SM3/SM4 functionality tests
- Math library tests (EC operations, field elements)
- Utility tests (Arrays, Integers, BigIntegers, Pack, SecureRandom)
- Block cipher mode tests (CBC, CFB, OFB, SIC/CTR, GCM)
- SM2 Signer tests
- SM2 Key Exchange tests
- KDF tests

### ❌ Blocked by Implementation Issues
- Padding scheme tests (23 tests) - Blocked by Issue #1
- Params tests (21 tests) - Blocked by Issue #3

### ⚠️ Partially Complete
- Performance tests - Marked and excluded (Issue #2 resolved)
- GCMUtil tests - Need investigation (Issue #4)

### 📊 Current Test Statistics
- **Total Tests**: 528 passing, 1 skipped, 2 deselected (performance)
- **Test Execution Time**: ~3.3 seconds (fast!)
- **Blocked Tests**: ~44 tests (padding + params)
- **Coverage**: High for implemented features, gaps where features missing

---

## Test Files Created During This Session

### Successfully Integrated ✅
1. `tests/unit/util/test_integers.py` - 66 tests ✅
2. `tests/unit/util/test_secure_random.py` - 24 tests ✅
3. `tests/unit/util/test_big_integers.py` - 40 tests ✅
4. `tests/unit/crypto/signers/test_sm2_signer.py` - Enhanced with standard vectors ✅

### Created but Blocked ❌
5. `tests/unit/test_padding_schemes.py` - 23 tests ❌ (Issue #1)
6. `tests/unit/crypto/params/test_ec_domain_parameters.py` - 10 tests ❌ (Issue #3)
7. `tests/unit/crypto/params/test_ec_key_parameters.py` - 11 tests ❌ (Issue #3)

### GraalVM Interop (Special)
8. `graalvm-interop/pom.xml` - Maven project for Java-Python interop testing
9. `graalvm-interop/src/test/java/org/example/SM2InteropTest.java` - Java test calling Python

---

## Documentation Updates

### Created/Updated
- `docs/TEST_ALIGNMENT_TRACKER.md` - Comprehensive test alignment tracking
- `docs/SPRINT_PROGRESS.md` - Sprint-by-sprint progress tracking  
- `docs/DEV_HANDOFF_ISSUES_20251206.md` - This document

### Key Decisions Documented
1. Performance tests marked and excluded by default
2. Test naming aligned with JS: "Should [behavior]" format
3. Comprehensive edge case testing for all utilities
4. Standard test vectors for cryptographic functions

---

## Contact & Questions

If you have questions about any of these issues or need clarification on test expectations:
1. Review the corresponding JS test files in `sm-js-bc/test/`
2. Check the TEST_ALIGNMENT_TRACKER.md for detailed test coverage matrix
3. Run specific test files to see failure details: `pytest <test_file> -v`

All tests follow the same patterns and expectations as the JS implementation for consistency.
