# Ev Certificate Validator

> Validate EV code signing certificate chain and timestamp for Windows SmartScreen

- Skill: `a5c-ai/ev-certificate-validator` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add a5c-ai/ev-certificate-validator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/ev-certificate-validator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/ev-certificate-validator

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# ev-certificate-validator

Validate EV (Extended Validation) code signing certificate chain and timestamp to ensure Windows SmartScreen compatibility.

## Capabilities

- Verify certificate chain validity
- Check timestamp presence and validity
- Validate EV certificate attributes
- Check certificate expiration
- Verify signature algorithm strength
- Validate publisher information

## Input Schema

```json
{
  "type": "object",
  "properties": {
    "signedFile": { "type": "string" },
    "checkSmartScreen": { "type": "boolean", "default": true }
  },
  "required": ["signedFile"]
}
```

## Validation Commands

```powershell
# Verify signature with chain
signtool verify /pa /all /v signed.exe

# Check certificate details
certutil -dump signed.exe

# Verify timestamp
signtool verify /pa /tw signed.exe
```

## Related Skills

- `windows-authenticode-signer`
- `code-signing-setup` process