test: Add 1 and update 10 files

SECURITY_REVIEW.md

@@ -29,15 +29,18 @@ This comprehensive security review analyzes the Simple Object Server C++23 appli
   - Removed all plaintext token support for enhanced security
 - **Documentation**: See README.md for token hashing instructions
 
-### 3. **Weak Cryptographic Hash for Content**
-- **Location**: `src/hash.cpp:12-56`
-- **Risk**: HIGH - Using XXHash (non-cryptographic) for content identification
-- **Issue**: XXHash is designed for speed, not security - vulnerable to collision attacks
-- **Impact**: Potential for malicious file substitution through hash collisions
-- **Recommendation**:
-  - Replace XXHash with SHA-256 or SHA-3 for content hashing
-  - Use cryptographic hashes for security-critical operations
-  - Keep XXHash only for non-security checksums if needed
+### 3. **~~Weak Cryptographic Hash for Content~~ [FIXED]
+- **Location**: `src/hash.cpp`
+- **Risk**: ~~HIGH~~ RESOLVED - Now using SHA-256 for content identification
+- **Fix Implemented**:
+  - Replaced XXHash with SHA-256 for all content hashing
+  - Using OpenSSL's SHA-256 implementation for cryptographic security
+  - All file hashes are now 256-bit SHA-256 hashes (64 hex characters)
+  - Collision resistance: 2^128 operations needed for 50% probability
+- **Security Benefits**:
+  - Cryptographically secure against intentional collisions
+  - Industry-standard hash function
+  - Prevents malicious file substitution attacks
 
 ## High-Risk Issues