OCTET STRING

The ASN.1 OCTET STRING type represents a sequence of octets (8-bit bytes). It is typically used to store arbitrary binary data or fixed-length byte arrays. In Python, the generated OCTET STRING class wraps the native bytes type.

Example ASN.1 definition:

MyOctetString ::= OCTET STRING

which generates a Python class roughly equivalent to:

class MyOctetString(_Asn1BasicType[bytes]):
    pass

Conceptual Representation

class _Asn1BasicType[bytes]

Represents an OCTET STRING ASN.1 type.

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

Initializes the OCTET STRING instance with an optional initial value.

The value must be a bytes object or None.

property value: bytes

Gets or sets the octet string value.

Setting the value accepts any object implementing the buffer protocol.

Note

Mutating the returned bytes object is not possible (since it is immutable). To update the value, assign a new bytes object explicitly.