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from enum import Enum
from asn1crypto.core import (
Boolean,
Enumerated,
Integer,
Null,
OctetString,
Sequence,
SetOf,
)
class Integers(SetOf):
_child_spec = Integer
class SecurityLevel(Enumerated):
_map = {
0: "Software",
1: "TrustedEnvironment",
2: "StrongBox",
}
class VerifiedBootState(Enumerated):
_map = {
0: "Verified",
1: "SelfSigned",
2: "Unverified",
3: "Failed",
}
class RootOfTrust(Sequence):
_fields = [
("verifiedBootKey", OctetString),
("deviceLocked", Boolean),
("verifiedBootState", VerifiedBootState),
("verifiedBootHash", OctetString),
]
class AuthorizationList(Sequence):
_fields = [
("purpose", Integers, {"explicit": 1, "optional": True}),
("algorithm", Integer, {"explicit": 2, "optional": True}),
("keySize", Integer, {"explicit": 3, "optional": True}),
("digest", Integers, {"explicit": 5, "optional": True}),
("padding", Integers, {"explicit": 6, "optional": True}),
("ecCurve", Integer, {"explicit": 10, "optional": True}),
("rsaPublicExponent", Integer, {"explicit": 200, "optional": True}),
("rollbackResistance", Null, {"explicit": 303, "optional": True}),
("activeDateTime", Integer, {"explicit": 400, "optional": True}),
("originationExpireDateTime", Integer, {"explicit": 401, "optional": True}),
("usageExpireDateTime", Integer, {"explicit": 402, "optional": True}),
("noAuthRequired", Null, {"explicit": 503, "optional": True}),
("userAuthType", Integer, {"explicit": 504, "optional": True}),
("authTimeout", Integer, {"explicit": 505, "optional": True}),
("allowWhileOnBody", Null, {"explicit": 506, "optional": True}),
("trustedUserPresenceRequired", Null, {"explicit": 507, "optional": True}),
("trustedConfirmationRequired", Null, {"explicit": 508, "optional": True}),
("unlockedDeviceRequired", Null, {"explicit": 509, "optional": True}),
("allApplications", Null, {"explicit": 600, "optional": True}),
("applicationId", OctetString, {"explicit": 601, "optional": True}),
("creationDateTime", Integer, {"explicit": 701, "optional": True}),
("origin", Integer, {"explicit": 702, "optional": True}),
("rollbackResistant", Null, {"explicit": 703, "optional": True}),
("rootOfTrust", RootOfTrust, {"explicit": 704, "optional": True}),
("osVersion", Integer, {"explicit": 705, "optional": True}),
("osPatchLevel", Integer, {"explicit": 706, "optional": True}),
("attestationApplicationId", OctetString, {"explicit": 709, "optional": True}),
("attestationIdBrand", OctetString, {"explicit": 710, "optional": True}),
("attestationIdDevice", OctetString, {"explicit": 711, "optional": True}),
("attestationIdProduct", OctetString, {"explicit": 712, "optional": True}),
("attestationIdSerial", OctetString, {"explicit": 713, "optional": True}),
("attestationIdImei", OctetString, {"explicit": 714, "optional": True}),
("attestationIdMeid", OctetString, {"explicit": 715, "optional": True}),
("attestationIdManufacturer", OctetString, {"explicit": 716, "optional": True}),
("attestationIdModel", OctetString, {"explicit": 717, "optional": True}),
("vendorPatchLevel", Integer, {"explicit": 718, "optional": True}),
("bootPatchLevel", Integer, {"explicit": 719, "optional": True}),
]
class KeyDescription(Sequence):
"""Attestation extension content as ASN.1 schema (DER-encoded)
Corresponds to X.509 certificate extension with the following OID:
`1.3.6.1.4.1.11129.2.1.17`
See https://source.android.com/security/keystore/attestation#schema
"""
_fields = [
("attestationVersion", Integer),
("attestationSecurityLevel", SecurityLevel),
("keymasterVersion", Integer),
("keymasterSecurityLevel", SecurityLevel),
("attestationChallenge", OctetString),
("uniqueId", OctetString),
("softwareEnforced", AuthorizationList),
("teeEnforced", AuthorizationList),
]
class KeyOrigin(int, Enum):
"""`Tag::ORIGIN`
See https://source.android.com/security/keystore/tags#origin
"""
GENERATED = 0
DERIVED = 1
IMPORTED = 2
UNKNOWN = 3
class KeyPurpose(int, Enum):
"""`Tag::PURPOSE`
See https://source.android.com/security/keystore/tags#purpose
"""
ENCRYPT = 0
DECRYPT = 1
SIGN = 2
VERIFY = 3
DERIVE_KEY = 4
WRAP_KEY = 5
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