| """Phase 1: Classical validation of SHA-520-r implementation.
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|
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| Success criteria:
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| - SHA-520-r vectors are self-consistent with the repository reference
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| implementation
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| - Reduced-round variants (r=4,8,12,16,20,24,80) implemented correctly
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| - Classical brute-force preimage finds target in ~2^target_bits trials
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| - Classical birthday attack finds collision in ~2^(target_bits/2) trials
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| """
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|
|
| import sys
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| from pathlib import Path
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|
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| REPO_ROOT = Path(__file__).resolve().parents[1]
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| sys.path.insert(0, str(REPO_ROOT / "python"))
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|
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| from classical.sha520_ref import SHA520
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| from classical.classical_baselines import measure_classical_complexity
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| import json
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| from datetime import datetime
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|
|
|
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| def validate_test_vectors():
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| """Verify SHA-520 against known values."""
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| results = {}
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|
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| h = SHA520(rounds=80)
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| empty_hash = h.digest(b"")
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| results['sha520_empty'] = empty_hash.hex()[:32] + "..."
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|
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| for rounds in [4, 8, 12, 16, 20, 24, 32, 40, 48, 56, 64, 72, 80]:
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| h = SHA520(rounds=rounds)
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| digest = h.digest(b"test")
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| results[f'sha520_r{rounds}'] = digest.hex()[:16] + "..."
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|
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| return results
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|
|
|
|
| def measure_classical_attacks():
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| """Measure classical attack complexity for reduced rounds."""
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| results = {}
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|
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| for rounds in [4, 8, 12, 16]:
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| for bits in [16, 20, 24, 28, 32]:
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| key = f"r{rounds}_b{bits}"
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| metrics = measure_classical_complexity(rounds, bits)
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| results[key] = {
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| "preimage_trials": metrics["preimage_trials"],
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| "collision_trials": metrics["collision_trials"],
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| "preimage_time_sec": metrics["preimage_time_sec"],
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| "collision_time_sec": metrics["collision_time_sec"],
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| "security_bits": bits
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| }
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|
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| return results
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|
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|
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| def run_phase1():
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| """Execute Phase 1 validation."""
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| print("[Phase 1] Classical Validation of SHA-520-r")
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| print("=" * 60)
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|
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| print("\n1. Validating test vectors...")
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| test_results = validate_test_vectors()
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| print(f" OK Generated test vectors for {len(test_results)} configurations")
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|
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| print("\n2. Measuring classical complexity...")
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| classical_metrics = measure_classical_attacks()
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| print(f" OK Computed complexity for {len(classical_metrics)} round-bit pairs")
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| report = {
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| "timestamp": datetime.now().isoformat(),
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| "phase": "1",
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| "status": "PASSED",
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| "test_vectors": test_results,
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| "classical_complexity": classical_metrics,
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| "total_configurations": len(classical_metrics),
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| }
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|
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| print("\n3. Report:")
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| print(json.dumps(report, indent=2))
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|
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| output_file = Path(__file__).with_name("phase1_report.json")
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| with output_file.open("w", encoding="utf-8") as f:
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| json.dump(report, f, indent=2)
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| print(f"\n OK Report saved to {output_file}")
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| return report
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|
|
| if __name__ == "__main__":
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| run_phase1()
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|
