OBJECT IDENTIFIER

The ASN.1 OBJECT IDENTIFIER (OID) type uniquely identifies objects such as standards, protocols, and algorithms using a dotted-decimal string notation.

In Python, the generated OBJECT IDENTIFIER class wraps a native str representing the dotted-decimal OID, e.g., "1.3.6.1.4.1".

Example ASN.1 definition:

MyOid ::= OBJECT IDENTIFIER

which generates a Python class similar to:

class MyOid(_Asn1BasicType[str]):
    pass

Conceptual Representation

class _Asn1BasicType[str]

Represents an ASN.1 OBJECT IDENTIFIER.

__init__(self, value: str | None = None) → None

Initializes the OID with an optional dotted-decimal string.

property value: str

Gets or sets the OID as a dotted-decimal string.

The string must follow the OID syntax, e.g., numbers separated by dots. Validation against this syntax is typically performed.

Usage Notes

• The OID string represents a hierarchical series of integer nodes separated by dots.

• Example of a valid OID string: "1.2.840.113549.1.1.5"

• Assignment accepts any valid dotted-decimal string.

RELATIVE-OID

The ASN.1 RELATIVE-OID type is similar to OBJECT IDENTIFIER but represents a relative path in the OID tree, omitting the root nodes.

In Python, RELATIVE-OID is also represented as a native str containing dot-separated integer arcs.

Example ASN.1 definition:

MyRelOid ::= RELATIVE-OID

which generates a Python class similar to:

class MyRelOid(_Asn1BasicType[str]):
    pass

Conceptual Representation

class _Asn1BasicType[str]

Represents an ASN.1 RELATIVE-OID.

__init__(self, value: str | None = None) → None

Initializes the relative OID with an optional dot-separated string.

property value: str

Gets or sets the relative OID string.

The string consists of dot-separated integers representing arcs relative to some root.