#
# This file is part of pyasn1-modules software.
#
# Created by Russ Housley
# Copyright (c) 2019, Vigil Security, LLC
# License: http://snmplabs.com/pyasn1/license.html
#

import sys

from pyasn1.codec.der import decoder as der_decoder
from pyasn1.codec.der import encoder as der_encoder

from pyasn1_modules import pem
from pyasn1_modules import rfc5280
from pyasn1_modules import rfc8103

try:
    import unittest2 as unittest
except ImportError:
    import unittest


class CAEADChaCha20Poly1305TestCase(unittest.TestCase):
    alg_id_pem_text = "MBsGCyqGSIb3DQEJEAMSBAzK/rq++s7brd7K+Ig="

    def setUp(self):
        self.asn1Spec = rfc5280.AlgorithmIdentifier()

    def testDerCodec(self):
        substrate = pem.readBase64fromText(self.alg_id_pem_text)
        asn1Object, rest = der_decoder.decode(substrate, asn1Spec=self.asn1Spec)
        assert not rest
        assert asn1Object.prettyPrint()
        assert asn1Object[0] == rfc8103.id_alg_AEADChaCha20Poly1305
        param, rest = der_decoder.decode(asn1Object[1], rfc8103.AEADChaCha20Poly1305Nonce())
        assert not rest
        assert param.prettyPrint()
        assert param == rfc8103.AEADChaCha20Poly1305Nonce(value='\xca\xfe\xba\xbe\xfa\xce\xdb\xad\xde\xca\xf8\x88')
        assert der_encoder.encode(asn1Object) == substrate


suite = unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])

if __name__ == '__main__':
    import sys

    result = unittest.TextTestRunner(verbosity=2).run(suite)
    sys.exit(not result.wasSuccessful())