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Tpm2 policy calc

tpm2_policy_calc

A module containing classes used to calculate TPM 2.0 policies.

PolicyHasher

An object used to hash TPM 2.0 policies with a specified hash.

__init__ 

__init__(hash_type: str) -> PolicyHasher

Init the hasher with the specified hash.

Parameters:

Name Type Description Default
hash_type str

sha256 or sha384

 required

Raises:

Type Description
ValueError

Invalid hash type

get_size 

get_size() -> int

Returns the size of the hash.

hash 

hash(data: str) -> bytes

Hashes the data using the specified type.

PolicyTreeOr

Object representing an OR junction in a policy tree.

__init__ 

__init__(
    components: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> PolicyTreeOr

Inits the policy tree junction with a list of connected components.

Parameters:

Name Type Description Default
components list

list of components

 required

Raises:

Type Description
ValueError

More then 8 connections

get_type 

get_type() -> str

Returns the type of junction.

validate 

validate() -> bool

Validates all components have the correct attributes.

get_policy_buffer 

get_policy_buffer(
    hash_obj: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> bytes

Creates and returns a buffer representing the policy.

get_policy 

get_policy(
    hash_obj: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> int

Returns a hashed policy buffer.

PolicyTreeAnd

Object representing an AND junction in a policy tree.

__init__ 

__init__(
    components: list[
        Union[PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo]
    ]
) -> PolicyTreeAnd

Inits the policy tree junction with a list of connected components.

get_type 

get_type() -> str

Returns the type of junction.

validate 

validate() -> bool

Validate.

get_policy 

get_policy(
    hash_obj: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> bytes

Returns a hashed policy buffer.

PolicyTreeSolo

This object should only be used to put a single policy claim under an OR.

__init__ 

__init__(
    policy_obj: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> PolicyTreeSolo

Inits the policy tree junction.

get_type 

get_type() -> str

Returns the type of junction.

validate 

validate() -> bool

Validate.

get_policy_buffer 

get_policy_buffer(
    hash_obj: Union[
        PolicyTreeAnd, PolicyTreeOr, PolicyTreeSolo
    ]
) -> bytes

Creates and returns a buffer representing the policy.

get_policy 

get_policy(
    hash_obj: Union[PolicyTreeAnd, PolicyTreeOr]
) -> int

Returns a hashed policy buffer.

PolicyLocality

Policy Primitive to describe a single assertion to create complex assertions.

__init__ 

__init__(localities: list[int]) -> PolicyLocality

Init with the requested localities.

get_bitfield 

get_bitfield() -> int

Return the bitfield attribute.

calc_bitfield_from_list 

calc_bitfield_from_list(localities: list[int]) -> int

Calculate the bitfield from a list of localities.

get_buffer_for_digest 

get_buffer_for_digest() -> str

Serializes the primitive.

Returns:

Type Description
str

string representing packed data as bytes (i.e. b'\x01\x00\x03')

PolicyCommandCode

Policy Primitive to describe a Command code.

__init__ 

__init__(
    command_code_string: Optional[str] = None,
) -> PolicyCommandCode

Init with the requested command code string.

get_code 

get_code() -> str

Returns the command_code_string attribute.

get_buffer_for_digest 

get_buffer_for_digest() -> str

Serializes the primitive.

Returns:

Type Description
str

string representing packed data as bytes (i.e. b'\x01\x00\x03')