Certificate

The cross-platform tool to get certificate info (including self-signed).

Installation

For most users, the recommended method to install is via pip:

pip install pycert

Import

from pycert import CertClient

Usage

Command from usual user:

from pycert import CertClient

client = CertClient(host="172.16.0.124")
print(client.get_all_info())

from pprint import pprint
from pycert import CertClient

cert = CertClient('pypi.org')

pprint(cert.get_all_info())

{
  "version": "v3",
  "valid_from": "2021-10-22T18:41:11",
  "valid_to": "2022-11-23T18:41:10",
  "is_valid": true,
  "is_self_signed": false,
  "issuer": {
    "C": "BE",
    "O": "GlobalSign nv-sa",
    "CN": "GlobalSign Atlas R3 DV TLS CA H2 2021"
  },
  "subject": {
    "CN": "www.python.org"
  },
  "signature_algorithm": "sha256",
  "serial_number": "1B7C6CD03E8E071BE48C2B1A7994075",
  "alternative_name": [
    "DNS:www.python.org",
    "DNS:*.python.org",
    "DNS:docs.python.org",
    "DNS:downloads.python.org",
    "DNS:pypi.python.org"
  ],
  "fingerprint": "CE1F8748D2DA0265B329F1DFD70047DCEF6CD8FB"
}

Useful links

• RFC3280
• OpenSSL cheatsheet

Changelog:

unreleased

1.0.2 (17.04.2022)

• External logger added

1.0.1 (14.12.2021)

• refactored "get_all_info": not it gets issuer and subject dynamically
• get_serial_number: returns upper hexadecimal without first bit now
• is_self_signed: preliminary method added (can be changed in future)
• get_all_methods fixed: now it returns CertClient methods
• get_alt_name refactored to get extension using oid

1.0.0 (8.12.2021)

• New method added: get_fingerprint()
• get_all_info() extended with thumbprint, added params (fp_brief=True, signature_algorithm_brief=True)
• get_signature_algorithm() updated to return full or brief signature info

0.0.12 (30.11.2021)

• example added

0.0.1 (30.11.2021)

• initial commit