JSON Web Signature

JSON Web Signature.

class josepy.jws.MediaType

MediaType field encoder/decoder.

PREFIX = 'application/'

MIME Media Type and Content Type prefix.

classmethod decode(value: str) → str

Decoder.

classmethod encode(value: str) → str

Encoder.

class josepy.jws.Header(**kwargs: Any)

JOSE Header.

Warning

This class supports only Registered Header Parameter Names (as defined in section 4.1 of the protocol). If you need Public Header Parameter Names (4.2) or Private Header Parameter Names (4.3), you must subclass and override from_json() and to_partial_json() appropriately.

Warning

This class does not support any extensions through the “crit” (Critical) Header Parameter (4.1.11) and as a conforming implementation, from_json() treats its occurrence as an error. Please subclass if you seek for a different behaviour.

Variables:

• x5tS256 – “x5t#S256”

• typ (str) – MIME Media Type, inc. MediaType.PREFIX.

• cty (str) – Content-Type, inc. MediaType.PREFIX.

not_omitted() → Dict[str, Field]

Fields that would not be omitted in the JSON object.

find_key() → JWK

Find key based on header.

Todo

Supports only “jwk” header parameter lookup.

Returns:

(Public) key found in the header.

Return type:

.JWK

Raises:

josepy.errors.Error – if key could not be found

class josepy.jws.Signature(**kwargs: Any)

JWS Signature.

Variables:

• combined – Combined Header (protected and unprotected, Header).

• protected (unicode) – JWS protected header (Jose Base-64 decoded).

• header – JWS Unprotected Header (Header).

• signature (str) – The signature.

header_cls

alias of Header

verify(payload: bytes, key: Optional[JWK] = None) → bool

Verify.

Parameters:

• payload (bytes) – Payload to verify.

• key (JWK) – Key used for verification.

classmethod sign(payload: bytes, key: JWK, alg: JWASignature, include_jwk: bool = True, protect: FrozenSet = frozenset({}), **kwargs: Any) → Signature

Sign.

Parameters:

• payload (bytes) – Payload to sign.

• key (JWK) – Key for signature.

• alg (JWASignature) – Signature algorithm to use to sign.

• include_jwk (bool) – If True, insert the JWK inside the signature headers.

• protect (FrozenSet) – List of headers to protect.

fields_to_partial_json() → Dict[str, Any]

Serialize fields to JSON.

classmethod fields_from_json(jobj: Mapping[str, Any]) → Dict[str, Any]

Deserialize fields from JSON.

class josepy.jws.JWS(**kwargs: Any)

JSON Web Signature.

Variables:

• payload (str) – JWS Payload.

• signature (str) – JWS Signatures.

signature_cls

alias of Signature

verify(key: Optional[JWK] = None) → bool

Verify.

classmethod sign(payload: bytes, **kwargs: Any) → JWS

Sign.

property signature: Signature

Get a singleton signature.

Return type:

JWS.signature_cls

to_compact() → bytes

Compact serialization.

Return type:

bytes

classmethod from_compact(compact: bytes) → JWS

Compact deserialization.

Parameters:

compact (bytes) –

to_partial_json(flat: bool = True) → Dict[str, Any]

Partially serialize.

Following the example, partial serialization means the following:

assert isinstance(Bar().to_partial_json()[0], Foo)
assert isinstance(Bar().to_partial_json()[1], Foo)

# in particular...
assert Bar().to_partial_json() != ['foo', 'foo']

Raises:

josepy.errors.SerializationError – in case of any serialization error.

Returns:

Partially serializable object.

classmethod from_json(jobj: Mapping[str, Any]) → JWS

Deserialize a decoded JSON document.

Parameters:

jobj – Python object, composed of only other basic data types, as decoded from JSON document. Not necessarily dict (as decoded from “JSON object” document).

Raises:

josepy.errors.DeserializationError – if decoding was unsuccessful, e.g. in case of unparseable X509 certificate, or wrong padding in JOSE base64 encoded string, etc.

class josepy.jws.CLI

JWS CLI.

classmethod sign(args: Namespace) → None

Sign.

classmethod verify(args: Namespace) → bool

Verify.

classmethod run(args: Optional[List[str]] = None) → Optional[bool]

Parse arguments and sign/verify.