1#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
2#
3#  Licensed under the Apache License, Version 2.0 (the "License");
4#  you may not use this file except in compliance with the License.
5#  You may obtain a copy of the License at
6#
7#      https://www.apache.org/licenses/LICENSE-2.0
8#
9#  Unless required by applicable law or agreed to in writing, software
10#  distributed under the License is distributed on an "AS IS" BASIS,
11#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12#  See the License for the specific language governing permissions and
13#  limitations under the License.
14
15"""ASN.1 definitions.
16
17Not all ASN.1-handling code use these definitions, but when it does, they should be here.
18"""
19
20from pyasn1.type import univ, namedtype, tag
21
22
23class PubKeyHeader(univ.Sequence):
24    componentType = namedtype.NamedTypes(
25            namedtype.NamedType('oid', univ.ObjectIdentifier()),
26            namedtype.NamedType('parameters', univ.Null()),
27    )
28
29
30class OpenSSLPubKey(univ.Sequence):
31    componentType = namedtype.NamedTypes(
32            namedtype.NamedType('header', PubKeyHeader()),
33
34            # This little hack (the implicit tag) allows us to get a Bit String as Octet String
35            namedtype.NamedType('key', univ.OctetString().subtype(
36                    implicitTag=tag.Tag(tagClass=0, tagFormat=0, tagId=3))),
37    )
38
39
40class AsnPubKey(univ.Sequence):
41    """ASN.1 contents of DER encoded public key:
42
43    RSAPublicKey ::= SEQUENCE {
44         modulus           INTEGER,  -- n
45         publicExponent    INTEGER,  -- e
46    """
47
48    componentType = namedtype.NamedTypes(
49            namedtype.NamedType('modulus', univ.Integer()),
50            namedtype.NamedType('publicExponent', univ.Integer()),
51    )
52