#
# PKCS#10 syntax
#
# ASN.1 source from:
# http://tools.ietf.org/html/rfc2314
#
# Sample captures could be obtained with "openssl req" command
#
from pyasn1.type import tag, namedtype, namedval, univ, constraint
from pyasn1_modules.rfc2459 import *
from pyasn1_modules import rfc2251

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

class Version(univ.Integer): pass

class CertificationRequestInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('version', Version()),
        namedtype.NamedType('subject', Name()),
        namedtype.NamedType('subjectPublicKeyInfo', SubjectPublicKeyInfo()),
        namedtype.NamedType('attributes', Attributes().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 0)))
    )

class Signature(univ.BitString): pass
class SignatureAlgorithmIdentifier(AlgorithmIdentifier): pass

class CertificationRequest(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('certificationRequestInfo', CertificationRequestInfo()),
        namedtype.NamedType('signatureAlgorithm', SignatureAlgorithmIdentifier()),
        namedtype.NamedType('signature', Signature())
    )

#
# PKCS#10 syntax
#
# ASN.1 source from:
# http://tools.ietf.org/html/rfc2314
#
# Sample captures could be obtained with "openssl req" command
#
from pyasn1.type import tag, namedtype, namedval, univ, constraint
from pyasn1_modules.rfc2459 import *

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

class Version(univ.Integer): pass

class CertificationRequestInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('version', Version()),
        namedtype.NamedType('subject', Name()),
        namedtype.NamedType('subjectPublicKeyInfo', SubjectPublicKeyInfo()),
        namedtype.NamedType('attributes', Attributes().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatConstructed, 0)))
    )

class Signature(univ.BitString): pass
class SignatureAlgorithmIdentifier(AlgorithmIdentifier): pass

class CertificationRequest(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('certificationRequestInfo', CertificationRequestInfo()),
        namedtype.NamedType('signatureAlgorithm', SignatureAlgorithmIdentifier()),
        namedtype.NamedType('signature', Signature())
    )

use rfc2459.Attribute() instead of rfc2251.Attribute()