codekingpro/portable-devtools

1# This file is being contributed to pyasn1-modules software.2#3# Created by Russ Housley with assistance from the asn1ate tool, with manual4#   changes to AES_CCM_ICVlen.subtypeSpec and added comments5#6# Copyright (c) 2018-2019, Vigil Security, LLC7# License: http://snmplabs.com/pyasn1/license.html8#9#  AES-CCM and AES-GCM Algorithms fo use with the Authenticated-Enveloped-Data10#  protecting content type for the Cryptographic Message Syntax (CMS)11#12# ASN.1 source from:13# https://www.rfc-editor.org/rfc/rfc5084.txt14 15from pyasn1.type import constraint16from pyasn1.type import namedtype17from pyasn1.type import univ18 19from pyasn1_modules import rfc528020 21 22def _OID(*components):23    output = []24    for x in tuple(components):25        if isinstance(x, univ.ObjectIdentifier):26            output.extend(list(x))27        else:28            output.append(int(x))29 30    return univ.ObjectIdentifier(output)31 32 33class AES_CCM_ICVlen(univ.Integer):34    pass35 36 37class AES_GCM_ICVlen(univ.Integer):38    pass39 40 41AES_CCM_ICVlen.subtypeSpec = constraint.SingleValueConstraint(4, 6, 8, 10, 12, 14, 16)42 43AES_GCM_ICVlen.subtypeSpec = constraint.ValueRangeConstraint(12, 16)44 45 46class CCMParameters(univ.Sequence):47    pass48 49 50CCMParameters.componentType = namedtype.NamedTypes(51    namedtype.NamedType('aes-nonce', univ.OctetString().subtype(subtypeSpec=constraint.ValueSizeConstraint(7, 13))),52    # The aes-nonce parameter contains 15-L octets, where L is the size of the length field. L=8 is RECOMMENDED.53    # Within the scope of any content-authenticated-encryption key, the nonce value MUST be unique.54    namedtype.DefaultedNamedType('aes-ICVlen', AES_CCM_ICVlen().subtype(value=12))55)56 57 58class GCMParameters(univ.Sequence):59    pass60 61 62GCMParameters.componentType = namedtype.NamedTypes(63    namedtype.NamedType('aes-nonce', univ.OctetString()),64    # The aes-nonce may have any number of bits between 8 and 2^64, but it MUST be a multiple of 8 bits.65    # Within the scope of any content-authenticated-encryption key, the nonce value MUST be unique.66    # A nonce value of 12 octets can be processed more efficiently, so that length is RECOMMENDED.67    namedtype.DefaultedNamedType('aes-ICVlen', AES_GCM_ICVlen().subtype(value=12))68)69 70aes = _OID(2, 16, 840, 1, 101, 3, 4, 1)71 72id_aes128_CCM = _OID(aes, 7)73 74id_aes128_GCM = _OID(aes, 6)75 76id_aes192_CCM = _OID(aes, 27)77 78id_aes192_GCM = _OID(aes, 26)79 80id_aes256_CCM = _OID(aes, 47)81 82id_aes256_GCM = _OID(aes, 46)83 84 85# Map of Algorithm Identifier OIDs to Parameters is added to the86# ones in rfc5280.py87 88_algorithmIdentifierMapUpdate = {89    id_aes128_CCM: CCMParameters(),90    id_aes128_GCM: GCMParameters(),91    id_aes192_CCM: CCMParameters(),92    id_aes192_GCM: GCMParameters(),93    id_aes256_CCM: CCMParameters(),94    id_aes256_GCM: GCMParameters(),95}96 97rfc5280.algorithmIdentifierMap.update(_algorithmIdentifierMapUpdate)98