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BF Crypto Audit

Weak cryptography detector (OWASP A02:2021 — Cryptographic Failures). Scans Python, JavaScript/TypeScript, Go, Java, and PHP source code for 10 classes of insecure cryptography — MD5/SHA1 password hashing, PRNG for security-sensitive values, hardcoded IVs, ECB mode, DES/RC4/Blowfish, RSA key size under 2048 bits, weak JWT secrets, bcrypt rounds too low, TLS 1.0/1.1 acceptance, and hardcoded cryptographic keys in source. Zero external dependencies. CI fail-gate included.

ClawHub Agent Skills author: Lucius Pang v1.0.3 MIT-0 2 files body ≈ 7 135 tokens Open the sourceclawhub.ai↗ analyzed 3 d ago

As a process F 26/100 · Will not run — References files that are not bundled: ?:md5|sha1|sha256|sha224, ?:MD5|SHA-?1|SHA-?256, ?:md5|sha1|sha256

AnalyzerSoftware developmenttype and topics are labelled automatically from the skill text
Runs in: OpenClaw Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) Goose OpenCode
JSON
Technical rating
B
75/100
safety, quality, tests
Safety 60%
95
Quality 40%
45
Run on models
none yet
Process rating
F
26/100
Will not run
References files that are not bundled: ?:md5|sha1|sha256|sha224, ?:MD5|SHA-?1|SHA-?256, ?:md5|sha1|sha256
Tools and files w 18
0
Result and completion w 14
0
Inputs and preconditions w 11
0
the three weakest of ten parameters · all ten

What is at stake

Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.

Secrets in code medium severity

Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.

If you install

The files contain someone else's key or token. If it is live, your agent will call third-party services under a stranger's identity; if it was revoked, the skill's scripts simply fail. Such a key often arrives with the author's whole workspace, personal data included.

For the author

The key is visible to everyone who downloaded the skill and has likely been copied by catalog-scanning bots already. Revoke it now, check bills and access logs, then reissue.

How to improve

  1. Say in the description WHEN to use the skill ("use when…", example requests): that is the agent's main cue.
  2. The SKILL.md body is over 5,000 tokens: move reference detail into references/ and load it when needed.
  3. The text references files that are not there: add them or drop the references.
For the model run — optional
  • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
  • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

Guard findings · 1

✓ No critical or high findings

Medium and low: 1
  • medium Secrets in code secret-labelled-token SKILL.md:112
    Labelled token / key literal (vendor format unknown — verify it is not a live credential)
    Hardcoded AES key: SECRET_KEY = "my-s…234"

Files scanned: 2. Evidence is masked. Grey chips explain why severity was lowered.

Against the Agent Skills spec

  • warning name-format name should be kebab-case (lowercase letters, digits, hyphens)
  • warning description-no-when description does not say WHEN to use the skill (no "use when")
  • warning body-long SKILL.md body ≈ 7135 tokens (recommended < 5000); move details to references/
  • warning missing-ref reference to a missing file: ?:md5|sha1|sha256|sha224
  • warning missing-ref reference to a missing file: ?:MD5|SHA-?1|SHA-?256
  • warning missing-ref reference to a missing file: ?:md5|sha1|sha256
  • warning missing-ref reference to a missing file: ?:md5|sha1
  • warning missing-ref reference to a missing file: (?:[A-Za-z0-9+/=]{16,}|[0-9a-fA-F]{16,}
  • warning missing-ref reference to a missing file: ?:DES|DESede|RC4|ARCFOUR|Blowfish
  • warning missing-ref reference to a missing file: ?:des|des-ede3|rc4|bf
  • warning missing-ref reference to a missing file: ?:DES|3DES|RC4|BF
  • note frontmatter-key unknown frontmatter key "homepage"

Process rating: all ten parameters 26/100

Will not run. References files that are not bundled: ?:md5|sha1|sha256|sha224, ?:MD5|SHA-?1|SHA-?256, ?:md5|sha1|sha256
  • 0Tools and files. 8 referenced file(s) missing: ?:md5|sha1|sha256|sha224, ?:MD5|SHA-?1|SHA-?256, ?:md5|sha1|sha256
  • 0Result and completion. Does not say what the result is
  • 0Inputs and preconditions. Does not say what the process needs to start
  • 0Failures and branches. Linear process with no failure handling
  • 0Progress reporting. Says nothing while it works
  • 20When it triggers. No condition that starts the skill
  • 30Running it twice. 1 mutating operations with no state check
  • 40Consistency. Frontmatter name (Crypto Audit) differs from the folder (phy-crypto-audit)
  • 70Execution cost. Instruction body is 7135 tokens
  • 100Steps. 15 steps

Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

Quality signals

  • +5Description has no quoted example phrases that should trigger the skill
  • +4Description does not say when NOT to use the skill (false activations)
  • +3Output format is not stated: the model decides each time
  • +2Single-language instructions
  • +3Description length 474: enough signal without eating the budget
  • +4Structure: 19 headings
  • +3Step-by-step instructions: 15 items
  • +4Has examples (4 code blocks)
  • +1License stated

Quality base 70; lint remarks subtract, signals add up to 100. Result: 45.

External checks

ClawHub: clean
This skill is a disclosed local crypto-audit helper and the scanner alert appears to come from an example secret in its sample output, not hidden harmful behavior.
LLM: benign (high) · VirusTotal: · 29 May 2026