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@peculiar/asn1-android
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@peculiar/asn1-android
The KeyDescription
class in this library represents the ASN.1 schema for the Android Keystore Key Description structure. However, in practice, there are cases where the AuthorizationList
fields in the softwareEnforced
and teeEnforced
fields are not strictly ordered, which can lead to ASN.1 structure reading errors.
To address this issue, this library provides a NonStandardKeyDescription
class that can read such structures. However, when creating extensions, it is recommended to use KeyDescription
, as it guarantees the order of object fields according to the specification.
Here are simplified TypeScript examples:
Example of creating a KeyDescription
object in TypeScript for the Android Keystore system
const attestation = new android.AttestationApplicationId({
packageInfos: [
new android.AttestationPackageInfo({
packageName: new OctetString(Buffer.from("123", "utf8")),
version: 1,
}),
],
signatureDigests: [
new OctetString(Buffer.from("123", "utf8")),
],
});
const keyDescription = new KeyDescription({
attestationVersion: android.Version.v200,
attestationSecurityLevel: android.SecurityLevel.software,
keymasterVersion: 1,
keymasterSecurityLevel: android.SecurityLevel.software,
attestationChallenge: new OctetString(Buffer.from("123", "utf8")),
uniqueId: new OctetString(Buffer.from("123", "utf8")),
softwareEnforced: new android.AuthorizationList({
creationDateTime: 1506793476000,
attestationApplicationId: new OctetString(AsnConvert.serialize(attestation)),
}),
teeEnforced: new android.AuthorizationList({
purpose: new android.IntegerSet([1]),
algorithm: 1,
keySize: 1,
digest: new android.IntegerSet([1]),
ecCurve: 1,
userAuthType: 1,
origin: 1,
rollbackResistant: null,
}),
});
const raw = AsnConvert.serialize(keyDescription);
Example of reading a NonStandardKeyDescription
object in TypeScript
const keyDescription = AsnConvert.parse(raw, NonStandardKeyDescription);
console.log(keyDescription.attestationVersion); // 100
console.log(keyDescription.attestationSecurityLevel); // 1
console.log(keyDescription.keymasterVersion); // 100
console.log(keyDescription.keymasterSecurityLevel); // 1
console.log(keyDescription.attestationChallenge.byteLength); // 32
console.log(keyDescription.uniqueId.byteLength); // 0
console.log(keyDescription.softwareEnforced.findProperty("attestationApplicationId")?.byteLength); // 81
console.log(keyDescription.teeEnforced.findProperty("attestationIdBrand")?.byteLength); // 8
FAQs
[![License](https://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/PeculiarVentures/asn1-schema/master/packages/android/LICENSE.md) [![npm version](https://badge.fury.io/js/%40peculiar%2Fasn1-android.svg)](https:
We found that @peculiar/asn1-android demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 6 open source maintainers collaborating on the project.
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