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Install in OpenClaw
/install hash-utilities
Description
Generate and verify hashes (MD5, SHA variants, CRC32, HMAC, BLAKE2) for strings and files with streaming support and no external dependencies.
README (SKILL.md)
🔐 Hash Toolkit
Author: Lin Hui | GitHub | MIT License | v1.0.0
Compute and verify hashes for strings, files, and data. Supports MD5, SHA1, SHA256, SHA512, CRC32, HMAC, and BLAKE2.
✨ Features
- String hashing — Hash any text with your choice of algorithm
- File hashing — Compute hash of any file (streaming for large files)
- Verify — Compare a hash against expected value (pass/fail)
- Batch — Hash multiple files at once
- HMAC — Keyed-hash message authentication codes
- CRC32 — Quick checksums for data integrity
- BLAKE2 — Modern, fast, secure hash algorithm
🚀 Usage
Calculate the SHA256 hash of the string "hello world"
Compute the MD5 hash of the file /path/to/file.zip
Verify that the SHA256 hash of download.iso matches abc123def...
Generate HMAC-SHA256 signature for "message" with key "secret"
Calculate CRC32 checksum for data.bin
⚙️ Technical Details
- Runtime: Python 3.6+
- Dependencies: Zero (stdlib only: hashlib, hmac, zlib, binascii)
- Algorithms: MD5, SHA1, SHA224, SHA256, SHA384, SHA512, BLAKE2b, BLAKE2s, CRC32
- Large files: Streaming with 8MB chunks
Usage Guidance
This appears to be a straightforward local hashing utility and is coherent with its description. Before installing or running it: (1) run it under a controlled environment (or inspect the repository link in SKILL.md) and ensure your runtime is Python 3.8+ (the code uses ':='); (2) only pass file paths or secrets you trust — the tool will read any file path you give it locally; (3) HMAC keys are used locally by the script — do not paste production secrets into an untrusted environment; and (4) if you need strict compatibility with Python 3.6–3.7, request or adapt a version of the code that avoids the walrus operator.
Capability Analysis
Type: OpenClaw Skill
Name: hash-utilities
Version: 1.0.0
The 'hash-utilities' skill is a standard implementation of a hashing and integrity verification tool using Python's built-in libraries (hashlib, hmac, zlib). The code in scripts/hash_tool.py follows best practices, such as using hmac.compare_digest for secure comparisons and processing files in chunks to handle large data efficiently, with no evidence of malicious intent or risky behaviors.
Capability Assessment
Purpose & Capability
The name, description, SKILL.md, and the included Python script all align: the skill computes and verifies hashes (MD5/SHA/CRC32/HMAC/BLAKE2) for strings and files. However, the SKILL.md claims 'Python 3.6+' while the code uses the walrus operator (':=') in file-read loops, which requires Python 3.8+. This is a mismatch between claimed runtime and actual code requirements.
Instruction Scope
SKILL.md only instructs how to hash strings/files, verify values, batch files, and generate HMACs. It does not ask the agent to read unrelated system files, environment variables, or send data to external endpoints. The CLI reads only user-specified file paths.
Install Mechanism
There is no install spec (instruction-only skill with an accompanying script). Nothing is downloaded or written during install according to metadata. The included code is pure-Python stdlib and does not require external packages.
Credentials
The skill requests no environment variables, no credentials, and no config paths. Its runtime uses only standard libraries (hashlib, hmac, zlib, binascii, os, argparse) which are appropriate for the stated functionality.
Persistence & Privilege
The skill is not marked always:true, does not request elevated/persistent presence, and does not modify other skills or system-wide configuration. Autonomous invocation is allowed by default but is not combined with any other concerning privileges.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install hash-utilities - After installation, invoke the skill by name or use
/hash-utilities - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.0
Initial release of hash-toolkit.
- Generate and verify hashes for strings and files using multiple algorithms (MD5, SHA1, SHA256, SHA512, CRC32, HMAC, BLAKE2).
- Supports file and batch hashing, verification, HMAC signatures, and CRC32 checksums.
- Processes large files efficiently with streaming.
- Pure Python implementation with zero external dependencies.
Metadata
Frequently Asked Questions
What is Hash Utilities?
Generate and verify hashes (MD5, SHA variants, CRC32, HMAC, BLAKE2) for strings and files with streaming support and no external dependencies. It is an AI Agent Skill for Claude Code / OpenClaw, with 53 downloads so far.
How do I install Hash Utilities?
Run "/install hash-utilities" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Hash Utilities free?
Yes, Hash Utilities is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Hash Utilities support?
Hash Utilities is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Hash Utilities?
It is built and maintained by darbling (@darbling); the current version is v1.0.0.
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