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Digital Studium 2025-05-14 18:55:50 +03:00
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.gitignore vendored Normal file
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.venv/

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cert_decoder/main.py Normal file
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from flask import Flask, request, render_template_string, redirect, url_for
from cryptography import x509
from cryptography.hazmat.backends import default_backend
app = Flask(__name__)
# Simple HTML Form
HTML_TEMPLATE = """
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="An online tool to decode SSL/TLS certificates. Paste your PEM certificate and instantly view details like Common Name (CN), Subject Alternative Names (SANs), issuer, validity, and more.">
<meta name="keywords" content="SSL certificate decoder, PEM decoder, SAN lookup, CN extractor, TLS cert info, certificate parser, online SSL tool">
<meta name="author" content="Your Name or Company">
<meta name="robots" content="index, follow">
<title>SSL Certificate Decoder - View CN, SAN, Issuer & More</title>
</head>
<body>
<h2>Decode SSL Certificate</h2>
<form method="POST">
<textarea name="certificate" rows="20" cols="80" placeholder="Paste your PEM certificate here..."></textarea><br><br>
<input type="submit" value="Decode">
</form>
{% if cert_info %}
<h3>Certificate Information:</h3>
<pre>{{ cert_info }}</pre>
{% endif %}
</body>
</html>
"""
def parse_certificate(pem_data):
try:
cert = x509.load_pem_x509_certificate(pem_data.encode(), default_backend())
except Exception as e:
return f"Invalid certificate: {e}"
issuer = cert.issuer.get_attributes_for_oid(x509.OID_COMMON_NAME)
subject = cert.subject.get_attributes_for_oid(x509.OID_COMMON_NAME)
not_before = cert.not_valid_before
not_after = cert.not_valid_after
serial_number = cert.serial_number
sig_algo = cert.signature_hash_algorithm.name
# Get SANs
try:
ext = cert.extensions.get_extension_for_class(x509.SubjectAlternativeName)
sans = ext.value.get_values_for_type(x509.DNSName)
except x509.ExtensionNotFound:
sans = []
output = f"""
Subject CN: {subject[0].value if subject else 'N/A'}
Issuer CN: {issuer[0].value if issuer else 'N/A'}
Valid From: {not_before}
Valid Until: {not_after}
Serial Number: {serial_number}
Signature Alg: {sig_algo}
SANs: {', '.join(sans) if sans else 'None'}
"""
return output.strip()
@app.route("/", methods=["GET", "POST"])
def index():
if request.method == "POST":
pem_cert = request.form.get("certificate", "").strip()
cert_info = parse_certificate(pem_cert)
# Store result temporarily in session or pass via GET param
return redirect(url_for('index', cert_info=cert_info))
# GET Request — show result if available
cert_info = request.args.get('cert_info')
return render_template_string(HTML_TEMPLATE, cert_info=cert_info)
if __name__ == "__main__":
app.run(debug=True, port=5000)

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cert_decoder/requirements.txt Normal file
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blinker==1.9.0
cffi==1.17.1
click==8.2.0
cryptography==44.0.3
Flask==3.1.1
itsdangerous==2.2.0
Jinja2==3.1.6
MarkupSafe==3.0.2
pycparser==2.22
Werkzeug==3.1.3