#
# PKCS#8 syntax
#
# ASN.1 source from:
# http://tools.ietf.org/html/rfc5208
#
# Sample captures could be obtained with "openssl pkcs8 -topk8" command
#
from pyasn1.type import tag, namedtype, namedval, univ, constraint
from pyasn1_modules.rfc2459 import *
from pyasn1_modules import rfc2251

class KeyEncryptionAlgorithms(AlgorithmIdentifier): pass

class PrivateKeyAlgorithms(AlgorithmIdentifier): pass

class EncryptedData(univ.OctetString): pass

class EncryptedPrivateKeyInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('encryptionAlgorithm', AlgorithmIdentifier()),
        namedtype.NamedType('encryptedData', EncryptedData())
    )

class PrivateKey(univ.OctetString): pass

class Attributes(univ.SetOf):
    componentType = rfc2251.Attribute()

class Version(univ.Integer):
    namedValues = namedval.NamedValues(('v1', 0), ('v2', 1)) 

class PrivateKeyInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('version', Version()),
        namedtype.NamedType('privateKeyAlgorithm', AlgorithmIdentifier()),
        namedtype.NamedType('privateKey', PrivateKey()),
        namedtype.OptionalNamedType('attributes', Attributes().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 0)))
    )