Stream encrypt using functor based chunk_storage #396
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When decrypting from storage, we now recursively retrieve and decrypt parent data maps if a child data map is provided. This allows handling of shrunk/nested data maps during decryption. The decrypt_from_storage function will: - Check if provided data map is a child - Recursively get and decrypt parent data maps until root is found - Use root data map for final decryption of content This maintains backwards compatibility while adding support for shrunk data maps in the storage decryption flow.
- Rename `decrypt` to `decrypt_sorted_set` to better reflect its purpose of handling pre-sorted encrypted chunks - Change visibility from `pub` to `pub(crate)` to restrict usage to within the crate only, as this is an internal implementation detail This change improves code clarity and enforces proper encapsulation by preventing external crates from directly accessing this implementation function.
Remove unused seek_info related code to simplify the public API. This code was not being used by any consumers and added unnecessary complexity to the codebase. Changes: - Remove seek_info related structs and functions - Simplify API by focusing on core encryption/decryption functionality - Maintain backwards compatibility for existing consumers This change reduces maintenance burden and makes the API surface more focused and easier to understand.
Move non-public utility functions from lib.rs to a new utils.rs module to improve code organization and readability. This change: - Creates a new utils.rs module for internal helper functions - Moves all non-public functions from lib.rs to utils.rs - Adds pub(crate) visibility to utility functions - Updates imports and function calls in lib.rs - Maintains all existing functionality while improving code structure The refactor makes lib.rs more focused on the public API while keeping implementation details in a dedicated utils module.
- **Moved stream methods to a separate `src/stream.rs` file:**
- Extracted stream-related structs and implementations from `src/lib.rs` to `src/stream.rs` for better readability and maintainability.
- Updated module imports and adjusted code to reflect the new structure.
- **Fixed test failures in `StreamSelfDecryptor`:**
- Added the `finalize_decryption` method to move the decrypted partial output to the final output path once all chunks are processed.
- Modified the `next_encrypted` method to call `finalize_decryption` when decryption is complete.
- Ensured that the decrypted content is available at the expected output path, resolving the "No such file or directory" errors in tests.
- **Improved error handling in `src/stream.rs`:**
- Updated error construction in `StreamSelfDecryptor` to use `std::io::Error` with appropriate `ErrorKind`, matching the expected type for `Error::Io`.
- Used `IoError::new(ErrorKind::Other, message)` to create detailed IO errors.
- Provided more descriptive error messages for file operations, aiding in debugging.
- **Resolved linter warnings and performed code cleanup:**
- Handled unused `Result` from `insert` operations by assigning them to `_`, satisfying `#[deny(unused_results)]`.
- Removed unused imports and organized existing imports for clarity.
- Ensured that all paths and directories are correctly created before file operations, adding checks and error messages where necessary.
- Replaced `?` operators with `unwrap()` in test functions to make failures more explicit during testing.
- Added debug print statements in tests to trace execution flow and identify the exact point of failure when a test does not pass.
- **Updated test implementations in `src/tests.rs` and `src/stream/tests.rs`:**
- Modified tests to verify directory existence before proceeding.
- Ensured that parent directories are created before writing files.
- Improved assertions and error messages to provide clearer feedback during test runs.
- Kept `TempDir` instances alive for the duration of tests to prevent premature deletion of temporary directories.
- **General code enhancements:**
- Maintained consistent use of file paths and error handling across the codebase.
- Ensured that temporary files and directories are properly managed to prevent resource leaks or unexpected errors.
- Improved code readability and maintainability by organizing code logically and adding helpful comments where appropriate.
Files affected:
- `src/stream.rs` (new file created for stream methods)
- `src/stream/tests.rs`
- `src/tests.rs`
- `src/lib.rs` (adjusted imports and removed moved code)
- `Cargo.toml` (updated dependencies if necessary)
Not currently used and requires a complete rewrite
This commit includes several significant improvements to chunk handling and testing: Core Changes: - Modified encrypt_from_file to store all chunks, including parent chunks - Fixed decrypt_full_set to use efficient HashMap lookup for chunks - Improved shrink_data_map to properly track and return all generated chunks - Updated decrypt to handle parent chunks correctly using HashMap lookup Test Improvements: - Added comprehensive encryption/decryption test covering all combinations: * encrypt() -> decrypt() * encrypt() -> decrypt_from_storage() * encrypt_from_file() -> decrypt() * encrypt_from_file() -> decrypt_from_storage() - Added test_encrypt_from_file_stores_all_chunks to verify chunk storage - Fixed platform_specific_sizes test to handle parent chunks correctly - Added detailed debug output in tests for better diagnostics - Improved error handling tests to match actual behavior The key insight was that we needed to: 1. Keep track of ALL chunks during encryption and shrinking 2. Use efficient HashMap lookups for chunk retrieval 3. Handle parent chunks correctly in all operations 4. Test all combinations of encryption/decryption methods These changes ensure consistent behavior across all encryption/decryption paths and improve the reliability of chunk handling throughout the codebase.
This commit includes significant improvements to the Python bindings and testing: Core Changes: - Fix type conversion issues between Python and Rust - Implement proper PyBytes handling in py_decrypt - Convert chunk hashes to hex strings for Python callbacks - Add proper error handling for Python callbacks - Fix memory management issues with PyEncryptedChunk Python Interface Improvements: - Return hex strings instead of raw bytes for chunk names - Implement proper content() method for PyEncryptedChunk - Add from_bytes classmethod for PyEncryptedChunk - Fix type annotations for Python callback functions Test Improvements: - Add comprehensive encryption/decryption test suite - Test all combinations of encryption and decryption methods - Add tests for large file handling - Add tests for data map shrinking - Verify cross-backend compatibility - Add detailed debug output in tests The changes ensure consistent behavior between Rust and Python APIs while maintaining proper memory safety and error handling. The comprehensive test suite now verifies all major use cases and edge conditions.
…rove Testing This commit introduces significant improvements to the Python bindings, adds streaming decryption functionality, and enhances test coverage across the codebase. BREAKING CHANGES: - Removed 'py_' prefix from Python binding function names for cleaner API - Changed Python module structure to use `_self_encryption` as internal module name Features: - Added streaming decryption support with parallel chunk retrieval - Implemented comprehensive Python bindings for all core functionality - Added serialization/deserialization functions to public API - Enhanced DataMap functionality with better child handling Python Binding Improvements: - Restructured Python package to follow best practices - Added proper type hints and docstrings - Implemented streaming decryption support in Python - Fixed naming conflicts between Rust and Python modules - Added comprehensive Python test suite Testing Enhancements: - Added comprehensive encryption/decryption test covering all combinations: * In-memory encryption -> All decryption methods * File-based encryption -> All decryption methods * Streaming decryption with parallel chunk retrieval - Added cross-platform compatibility tests - Enhanced error handling tests - Added tests for DataMap child functionality - Improved test coverage for edge cases Documentation: - Updated README with comprehensive Python usage examples - Added detailed API documentation for Python bindings - Improved function documentation and type annotations - Added examples for streaming operations - Updated implementation details section Build System: - Updated pyproject.toml for better Python package management - Fixed maturin configuration for proper module naming - Improved Python package structure - Added proper dependencies in setup.py The changes provide a more robust, well-tested, and user-friendly interface for both Rust and Python users, with particular emphasis on handling large files efficiently through streaming operations.
BREAKING_CHANGE :
This commit adds chunk verification functionality and improves the Python bindings: Features: - Add verify_chunk function to validate chunk content against expected hash - Add comprehensive tests for chunk verification - Clean up Python bindings naming and structure Python Binding Changes: - Remove 'py_' prefix from all Python-exposed functions for cleaner API - Fix module structure to properly expose functionality - Add chunk verification to Python API - Update Python tests to cover all functionality including verification - Fix module naming and import issues Testing: - Add test_verify_chunk to Python test suite - Add Rust test for verify_chunk functionality - Enhance comprehensive test coverage - Add cross-platform compatibility tests Documentation: - Update README with chunk verification examples in both Rust and Python - Clean up Python API documentation - Add type hints and docstrings to Python bindings Build System: - Fix pyproject.toml configuration - Update module naming in setup.py - Fix Python package structure - Add proper dependencies The changes provide a more robust way to verify chunk integrity and improve the overall usability of the Python bindings.
This commit updates the benchmarks to use the public API instead of internal functions: - Replace `decrypt_full_set` with public `decrypt` function in benchmarks - Update imports in benches/lib.rs to use only public API - Maintain same benchmarking functionality while using proper public interface The change ensures that benchmarks follow the same patterns as regular usage of the library by utilizing the public API instead of internal implementation details. This makes the benchmarks more representative of real-world usage and maintains proper API boundaries.
This commit enhances the Python bindings documentation and usability: Core Changes: - Add detailed module-level documentation to self_encryption/__init__.py - Add comprehensive docstrings to all Python-exposed classes and functions - Document all parameters, return types, and exceptions - Add examples in docstrings for common use cases Documentation Improvements: - Add overview of library features and capabilities - Document all public APIs with type hints and descriptions - Add usage examples for basic and advanced features - Include detailed explanations of key concepts - Add cross-references between related functionality Python Bindings: - Add docstrings to PyDataMap, PyEncryptedChunk, and PyXorName classes - Document all class methods and attributes - Add parameter and return type documentation - Include exception information in docstrings - Add examples for common operations The changes ensure that Python users can get comprehensive help using the built-in help() function, making the library more accessible and easier to use. Documentation follows Python conventions and provides clear, practical examples for all functionality.
Add a comprehensive CLI that exposes all core functionality of the self-encryption library, making it easily accessible from the terminal. The CLI is fully integrated with the Python package and will be included in all releases. New Features: - Add `self-encryption` CLI command with subcommands: - encrypt-file: Encrypt files and store chunks - decrypt-file: Decrypt files using data maps and chunks - verify: Verify integrity of encrypted chunks - shrink: Optimize data maps by consolidating chunks - Add comprehensive --help documentation for all commands - Support both JSON and human-readable output formats - Include streaming support for large file operations Technical Changes: - Add click>=8.0.0 as a dependency - Configure entry points in both pyproject.toml and setup.py - Integrate CLI module with package's public interface - Add error handling with colored output The CLI maintains full compatibility with existing Python bindings while making the library more accessible to command-line users.
Improve documentation and clarity of the Python bindings and CLI interface, with particular focus on streaming operations and API completeness. Documentation Improvements: - Add comprehensive docstrings for all Python functions - Enhance streaming_decrypt_from_storage documentation with parallel processing details - Add detailed examples using ThreadPoolExecutor for chunk retrieval - Include minimum size requirements in encryption documentation - Add CLI usage examples and command descriptions Technical Details: - Clarify get_chunks callback interface for streaming operations - Add key features section for streaming functionality - Improve error descriptions and type hints - Add memory efficiency notes for large file operations Version bump to 0.32.3 to reflect documentation improvements.
To add actual streaming next
- Replace get_pki with get_pad_key_and_iv to match original encryption algorithm - Create sorted vector of source hashes upfront for consistent encryption - Remove unused chunk_count parameter from encrypt_stream function - Simplify code by removing manual hash lookups for each chunk type All tests passing. This change maintains the same encryption algorithm while processing chunks in a streaming fashion, improving memory efficiency for large files.
This commit introduces several improvements to the Python bindings and documentation: - Add streaming_encrypt_from_file function for memory-efficient file encryption - Consolidate Python documentation into a single, well-organized section - Update examples to demonstrate both regular and streaming encryption methods - Add installation instructions and improve API documentation structure - Remove duplicate and outdated Python binding sections The streaming encryption feature allows processing large files without loading them entirely into memory, while maintaining the same security guarantees as the regular encryption method.
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grumbach
reviewed
Nov 29, 2024
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| // Load the data map from file or another source | ||
| let data_map = load_data_map("path/to/data_map")?; |
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Thanks @grumpy I have added clap and made this use cmd line args now
grumbach
reviewed
Nov 29, 2024
src/encrypt.rs
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| /// Encrypt chunks in a streaming fashion, processing them in the correct order to satisfy the | ||
| /// encryption requirements. Each chunk is encrypted using the hashes of two other chunks: | ||
| /// - For chunk 0: Uses hashes of the last two chunks | ||
| /// - For chunk 1: Uses hash of chunk 0 and the last chunk | ||
| /// - For chunks 2+: Uses hashes of the previous two chunks | ||
| pub(crate) fn encrypt_stream( | ||
| chunks: Vec<RawChunk>, | ||
| ) -> Result<(DataMap, Vec<EncryptedChunk>)> { | ||
| // Create a sorted vector of all hashes |
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The memory impact of this one for HUGE files is HUGE x 2 as chunks stays in memory all run time and encrypted_chunks as well.
I don't understand how this is streaming?
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Although the code is clean and I think this could be used as a regular all in mem algo but stream should maybe be stripped out of the name?
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Nice catch, this was in another commit. I have added it in the code now and we actually do save chunks to the store as we process them and that should fix this one, but great catch
grumbach
reviewed
Nov 29, 2024
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| pub struct StreamSelfEncryptor { | ||
| // File path for the encryption target. | ||
| file_path: PathBuf, | ||
| // List of `(start_position, end_position)` for each chunk for the target file. |
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Great that we removed this buggy piece of code!
grumbach
reviewed
Nov 29, 2024
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| /// Helper function to XOR a data with a pad (pad will be rotated to fill the length) | ||
| pub(crate) fn xor(data: &Bytes, &Pad(pad): &Pad) -> Bytes { | ||
| let vec: Vec<_> = data |
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Having all these in a different utils.rs file is a great improvement!!
grumbach
reviewed
Nov 29, 2024
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| // (NB: this hard-coded ref needs update if algorithm changes) | ||
| let ref_data_map = vec![ | ||
| ChunkInfo { | ||
| src_hash: XorName([ | ||
| 219, 177, 84, 234, 189, 172, 82, 64, 169, 100, 5, 56, 3, 43, 142, 126, 51, 235, | ||
| 194, 243, 30, 130, 132, 197, 137, 36, 170, 62, 46, 44, 176, 201, | ||
| ]), | ||
| dst_hash: XorName([ | ||
| 248, 155, 46, 153, 173, 52, 226, 212, 133, 172, 107, 200, 72, 150, 41, 50, 116, 77, | ||
| 85, 92, 67, 168, 25, 56, 93, 61, 209, 194, 65, 172, 227, 130, |
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Did the algo change? I feel like this kind of test was very useful as they are very strict
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Yes, as we now shrink data_maps and they all have length==3 this test became invalid. I think we should re-introduce such a test again when all this work is in place as it's very handy. In tis case I Could not differentiate the chunks from the file and data_map though.
What we did though was create a backend matrix that compares all encrypt and decrypt functions in a matrix to check we have not broken any existing algorithms. It's not as robust as a test like this one though and I agree we should introduce another hard coded one like this soon
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Yes, the issue is we now shrink the data maps and don't return any > Len == 3 so the test became useless at this time. We should look to create another such test for backwards compatibility again when all these changes are in place.
grumbach
reviewed
Nov 29, 2024
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This file was maybe added by accident?
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yes, it should be gone now.
grumbach
reviewed
Nov 29, 2024
The streaming encryption implementation was holding all encrypted chunks in memory, defeating the purpose of streaming. This change: - Modified encrypt_stream to only return DataMap instead of (DataMap, Vec<EncryptedChunk>) - Updated streaming_encrypt_from_file to encrypt and store chunks immediately - Removed redundant chunk storage in encrypt_stream - Maintains same encryption logic and chunk ordering This reduces memory usage by processing and storing chunks as they are encrypted rather than accumulating them in memory.
Added a test to verify that the encryption algorithm produces consistent results when encrypting the same input data multiple times. The test: - Creates identical input files with deterministic content - Encrypts them using separate storage instances - Verifies that: - Data maps have identical structure - Generated chunks have identical content - Chunk hashes match between runs This helps ensure that changes to the streaming implementation don't affect the underlying encryption algorithm's deterministic behavior.
Enhanced the parallel streaming decryptor example with proper CLI handling: - Added required command line arguments for: - Data map file path (-d, --data-map) - Chunks directory path (-c, --chunks-dir) - Output file path (-o, --output) - Added comprehensive path validation: - Checks data map file exists and is readable - Verifies chunks directory exists and is a directory - Validates output directory exists and is writable - Added clap dependency with derive features - Improved error messages and user feedback The example now provides a more robust CLI interface with proper validation before attempting decryption operations.
b-zee
previously approved these changes
Dec 10, 2024
Rename the encryption module to aes to better reflect its implementation using AES-128-CBC cipher. Update all module references across the codebase: - Update lib.rs to use 'mod aes' instead of 'mod encryption' - Update imports in utils.rs, encrypt.rs, and decrypt.rs - Keep the same functionality while improving code clarity This change makes the codebase more maintainable by using more specific and accurate module naming.
Refactors streaming_encrypt_from_file to use a single pass through the file while maintaining correct encryption. Key changes: - Collects all source hashes while reading chunks - Processes chunks 2+ immediately after getting their hashes - Stores first two chunks for processing after all hashes are available - Uses shrink_data_map to handle child map creation - Returns shrunk data map for consistency with encrypt() This maintains the streaming efficiency while ensuring correct encryption by: 1. Only reading each chunk once from disk 2. Keeping minimal data in memory 3. Preserving the encryption requirements (all hashes needed) 4. Properly handling the data map hierarchy The function now matches the behavior of encrypt() while being more memory efficient for large files.
This reverts commit 642e58f.
b-zee
approved these changes
Dec 16, 2024
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Implement Streaming Encryption with Memory-Efficient Processing
Overview
This PR introduces a new streaming encryption implementation that processes file chunks efficiently without requiring all data to be loaded into memory at once. The implementation maintains the security properties of the original algorithm while improving memory usage for large files.
Key Changes
New Streaming Implementation
Added encrypt_stream function that processes chunks in a streaming fashion
Maintains correct encryption order for all chunks:
Chunk 0: Uses hashes from last two chunks
Chunk 1: Uses hash 0 and last hash
Chunks 2+: Uses previous two hashes
Leverages Rayon for parallel processing of chunks 2 and onwards
Uses get_pad_key_and_iv with sorted source hashes to ensure consistent encryption
Memory Efficiency Improvements
Processes chunks in order without requiring full file loading
Builds hashes incrementally while maintaining encryption requirements
Optimizes memory usage by processing chunks in parallel where possible
Code Organization
Simplified encryption logic by using a pre-sorted vector of source hashes
Removed redundant chunk count parameter
Improved error handling with proper Result types
Maintained compatibility with existing encryption algorithms and data structures
Testing
All tests are passing, including:
Small file encryption
Minimum size requirements
Large file handling
Cross-platform compatibility
Error handling scenarios
Concurrent access patterns
Performance Impact
Improved memory efficiency for large files
Maintained parallel processing capabilities where possible
No significant impact on encryption/decryption speed
Security Considerations
Maintains the same encryption algorithm and security properties
Preserves the original chunk dependency model
No changes to core cryptographic operations
Future Work
Consider additional optimizations for very large files
Potential for streaming decryption implementation
Further performance benchmarking with different file sizes
Breaking Changes
None. This implementation maintains backward compatibility with existing APIs and data formats.