asn1crypto_csr_structure_definition_and_parsing.py

1from asn1crypto import csr, keys
2
3# Define a CSR (Certificate Signing Request)
4info = csr.CertificationRequestInfo({
5    'version': 'v1',
6    'subject': {
7        'common_name': 'python.org',
8        'country_name': 'US',
9    },
10    'subject_pk_info': {
11        'algorithm': {
12            'algorithm': 'rsa',
13        },
14        'public_key': keys.RSAPublicKey({
15            'modulus': 0x00e0b3...,
16            'public_exponent': 65537,
17        })
18    }
19})
20
21request = csr.CertificationRequest({
22    'certification_request_info': info,
23    'signature_algorithm': {
24        'algorithm': 'sha256_rsa',
25    },
26    'signature': b'...'
27})
28
29# Dump the encoded bytes
30encoded_bytes = request.dump()
31
32# Parse the encoded bytes
33parsed_request = csr.CertificationRequest.load(encoded_bytes)
34
35print(parsed_request['certification_request_info']['subject'].native)