python.pyasn1在strctu下面表示

Question

我是Python和PYASN1的新手，下面的结构如何表达？有什么文件我可以参考吗？我在网上搜索，有一个关于PYASN1的小文件

OtherInfo ::= SEQUENCE {
       keyInfo KeySpecificInfo,
       partyAInfo [0] OCTET STRING OPTIONAL,
       suppPubInfo [2] OCTET STRING
     }

KeySpecificInfo ::= SEQUENCE {
    algorithm OBJECT IDENTIFIER,
    counter OCTET STRING SIZE (4..4) }

Answer 1

假设您的ASN.1模块默认声明显式标记，则应该是这样的

还有docs

class KeySpecificInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('algorithm', ObjectIdentifier()),
        namedtype.NamedType(
            'counter', OctetString().subtype(subtypeSpec=ValueSizeConstraint(4, 4)))
    )

class OtherInfo(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('keyInfo', KeySpecificInfo()),
        namedtype.OptionalNamedType('partyAInfo', OctetString().subtype(
            explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)),
        namedtype.NamedType('suppPubInfo', OctetString().subtype(
            explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2))
    )