A Python utility for analyzing X.509 certificates. This tool can inspect individual certificate files or recursively scan directories for certificates, providing detailed information about each certificate found.

• Analyze single certificate files or entire directories
• Support for multiple certificate formats (.pem, .crt, .cer, .der)
• Display key certificate information:
  • Subject Common Name
  • Full subject details
  • Issuer information
  • Validity period
  • Current validity status

• Python 3.6+
• cryptography library

Install the required dependency using pip:

pip install cryptography

python cert-inspector.py <path_to_certificate_or_directory>

Analyze a single certificate:

python cert-inspector.py /path/to/certificate.pem

Scan a directory for certificates:

python cert-inspector.py /path/to/certificates/directory

For each certificate, the tool displays:

• File path
• Certificate subject (Common Name)
• Complete subject information
• Issuer details
• Validity period
• Current status (VALID, EXPIRED, or NOT YET VALID)

• .pem - Privacy Enhanced Mail certificates
• .crt - Certificate files
• .cer - Certificate files
• .der - DER encoded certificates

The tool provides error messages for:

• Invalid file paths
• Malformed certificates
• Directories with no certificate files
• Incorrect usage