98 lines
2.8 KiB
Python
98 lines
2.8 KiB
Python
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# This file is being contributed to pyasn1-modules software.
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#
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# Created by Russ Housley with assistance from the asn1ate tool, with manual
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# changes to AES_CCM_ICVlen.subtypeSpec and added comments
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#
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# Copyright (c) 2018-2019, Vigil Security, LLC
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# License: http://snmplabs.com/pyasn1/license.html
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#
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# AES-CCM and AES-GCM Algorithms fo use with the Authenticated-Enveloped-Data
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# protecting content type for the Cryptographic Message Syntax (CMS)
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#
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# ASN.1 source from:
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# https://www.rfc-editor.org/rfc/rfc5084.txt
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from pyasn1.type import constraint
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from pyasn1.type import namedtype
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from pyasn1.type import univ
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from pyasn1_modules import rfc5280
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def _OID(*components):
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output = []
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for x in tuple(components):
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if isinstance(x, univ.ObjectIdentifier):
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output.extend(list(x))
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else:
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output.append(int(x))
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return univ.ObjectIdentifier(output)
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class AES_CCM_ICVlen(univ.Integer):
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pass
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class AES_GCM_ICVlen(univ.Integer):
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pass
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AES_CCM_ICVlen.subtypeSpec = constraint.SingleValueConstraint(4, 6, 8, 10, 12, 14, 16)
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AES_GCM_ICVlen.subtypeSpec = constraint.ValueRangeConstraint(12, 16)
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class CCMParameters(univ.Sequence):
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pass
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CCMParameters.componentType = namedtype.NamedTypes(
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namedtype.NamedType('aes-nonce', univ.OctetString().subtype(subtypeSpec=constraint.ValueSizeConstraint(7, 13))),
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# The aes-nonce parameter contains 15-L octets, where L is the size of the length field. L=8 is RECOMMENDED.
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# Within the scope of any content-authenticated-encryption key, the nonce value MUST be unique.
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namedtype.DefaultedNamedType('aes-ICVlen', AES_CCM_ICVlen().subtype(value=12))
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)
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class GCMParameters(univ.Sequence):
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pass
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GCMParameters.componentType = namedtype.NamedTypes(
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namedtype.NamedType('aes-nonce', univ.OctetString()),
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# The aes-nonce may have any number of bits between 8 and 2^64, but it MUST be a multiple of 8 bits.
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# Within the scope of any content-authenticated-encryption key, the nonce value MUST be unique.
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# A nonce value of 12 octets can be processed more efficiently, so that length is RECOMMENDED.
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namedtype.DefaultedNamedType('aes-ICVlen', AES_GCM_ICVlen().subtype(value=12))
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)
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aes = _OID(2, 16, 840, 1, 101, 3, 4, 1)
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id_aes128_CCM = _OID(aes, 7)
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id_aes128_GCM = _OID(aes, 6)
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id_aes192_CCM = _OID(aes, 27)
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id_aes192_GCM = _OID(aes, 26)
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id_aes256_CCM = _OID(aes, 47)
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id_aes256_GCM = _OID(aes, 46)
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# Map of Algorithm Identifier OIDs to Parameters is added to the
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# ones in rfc5280.py
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_algorithmIdentifierMapUpdate = {
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id_aes128_CCM: CCMParameters(),
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id_aes128_GCM: GCMParameters(),
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id_aes192_CCM: CCMParameters(),
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id_aes192_GCM: GCMParameters(),
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id_aes256_CCM: CCMParameters(),
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id_aes256_GCM: GCMParameters(),
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}
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rfc5280.algorithmIdentifierMap.update(_algorithmIdentifierMapUpdate)
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