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import asn1 from '@lapo/asn1js';
/**
* Decode an X.509 certificate's ASN1 document (e.g. attStmt.x5c[0])
*/
export function leafCertToASN1Object(leafCert: Buffer): ASN1Object {
return asn1.decode(leafCert);
}
/**
* Recursively map an ASN1 document to JSON
*/
export function asn1ObjectToJSON(asn1object: ASN1Object): JASN1 {
const jasn: JASN1 = {
type: asn1object.typeName(),
data: [],
};
if (!asn1object.sub) {
if (asn1object.typeName() === 'BIT_STRING' || asn1object.typeName() === 'OCTET_STRING')
jasn.data = asn1object.stream.enc.slice(asn1object.posContent(), asn1object.posEnd());
else jasn.data = asn1object.content();
return jasn;
}
jasn.data = [];
for (const sub of asn1object.sub) {
jasn.data.push(asn1ObjectToJSON(sub));
}
return jasn;
}
/**
* Find a specific extension in an ASN1 document by its OBJECT_IDENTIFIER
*/
export function findOID(asn1object: ASN1Object, oid: string): JASN1 | undefined {
if (!asn1object.sub) {
return;
}
for (const sub of asn1object.sub) {
const type = sub.typeName();
const content = sub.content();
if (type !== 'OBJECT_IDENTIFIER' || (typeof content === 'string' && content.indexOf(oid) < 0)) {
const result = findOID(sub, oid);
if (result) {
return result;
}
} else {
return asn1ObjectToJSON(asn1object);
}
}
}
/**
* Observed output from asn1.decode() relevant to the various helpers
*/
export type ASN1Object = {
typeName: () => string;
posContent: () => number;
posEnd: () => number;
content: () => string | null;
stream: {
enc: Buffer;
};
sub?: ASN1Object[];
};
/**
* JSON-decoded values from an ASN1 document
*/
export type JASN1 = {
type: string;
data: JASN1[] | string | Buffer | null;
};
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