def _create_certificate_chain():
    caext = X509Extension(b('basicConstraints'), False, b('CA:true'))

    # Step 1
    cakey = PKey()
    cakey.generate_key(TYPE_RSA, 512)
    cacert = X509()
    cacert.get_subject().commonName = "Authority Certificate"
    cacert.set_issuer(cacert.get_subject())
    cacert.set_pubkey(cakey)
    cacert.set_notBefore(b("20000101000000Z"))
    cacert.set_notAfter(b("20200101000000Z"))
    cacert.add_extensions([caext])
    cacert.set_serial_number(0)
    cacert.sign(cakey, "sha1")

    # Step 2
    ikey = PKey()
    ikey.generate_key(TYPE_RSA, 512)
    icert = X509()
    icert.get_subject().commonName = "Intermediate Certificate"
    icert.set_issuer(cacert.get_subject())
    icert.set_pubkey(ikey)
    icert.set_notBefore(b("20000101000000Z"))
    icert.set_notAfter(b("20200101000000Z"))
    icert.add_extensions([caext])
    icert.set_serial_number(0)
    icert.sign(cakey, "sha1")

    # Step 3
    skey = PKey()
    skey.generate_key(TYPE_RSA, 512)
    scert = X509()
    scert.get_subject().commonName = "Server Certificate"
    scert.set_issuer(icert.get_subject())
    scert.set_pubkey(skey)
    scert.set_notBefore(b("20000101000000Z"))
    scert.set_notAfter(b("20200101000000Z"))
    scert.add_extensions([
            X509Extension(b('basicConstraints'), True, b('CA:false'))])
    scert.set_serial_number(0)
    scert.sign(ikey, "sha1")

    return [(cakey, cacert), (ikey, icert), (skey, scert)]
Construct and return a chain of certificates.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyopenssl/OpenSSL/test/test_ssl.py/_create_certificate_chain