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JavaScript generic ASN.1 parser (mirror)
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asn1js dumpASN1.js
2.9 kB · 83 lines
JavaScript
at github-104
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384#!/usr/bin/env node
// usage:// ./dumpASN1.js filename// ./dumpASN1.js data:base64,MDMCAQFjLgQACgEACgEAAgEAAgEAAQEAoA+jDQQFTnRWZXIEBAEAAAAwCgQITmV0bG9nb24===
import * as fs from 'node:fs';import { Base64 } from './base64.js';import { ASN1 } from './asn1.js';import { Defs } from './defs.js';
const colYellow = '\x1b[33m', colBlue = '\x1b[34m', colReset = '\x1b[0m', reDataURI = /^data:(?:[a-z-]+[/][a-z.+-]+;)?base64,([A-Za-z0-9+/=\s]+)$/;
function print(value, indent) { if (indent === undefined) indent = ''; const def = value.def; let name = ''; if (def?.type) { if (def.id) name += colBlue + def.id + colReset; if (typeof def.type == 'object' && def.name) name = (name ? name + ' ' : '') + def.name; if (def.mismatch) name = (name ? name + ' ' : '') + '[?]'; if (name) name += ' '; } let s = indent + name + colYellow + value.typeName() + colReset + ' @' + value.stream.pos; if (value.length >= 0) s += '+'; s += value.length; if (value.tag.tagConstructed) s += ' (constructed)'; else if ((value.tag.isUniversal() && ((value.tag.tagNumber == 0x03) || (value.tag.tagNumber == 0x04))) && (value.sub !== null)) s += ' (encapsulates)'; let content = value.content(); if (content) s += ': ' + content.replace(/\n/g, '|'); s += '\n'; if (value.sub !== null) { indent += ' '; for (const subval of value.sub) s += print(subval, indent); } return s;}
const filename = process.argv[2];const match = reDataURI.exec(filename);let content = match ? Buffer.from(match[1]) : fs.readFileSync(filename);try { // try PEM first content = Base64.unarmor(content);} catch (ignore) { // try DER/BER then}let result = ASN1.decode(content);content = null;const t0 = performance.now();if (process.argv.length == 5) { Defs.match(result, Defs.moduleAndType(Defs.RFC[process.argv[3]], process.argv[4]));} else { const types = Defs.commonTypes .map(type => { const stats = Defs.match(result, type); return { type, match: stats.recognized / stats.total }; }) .sort((a, b) => b.match - a.match); const t1 = performance.now(); console.log('Parsed in ' + (t1 - t0).toFixed(2) + ' ms; possible types:'); for (const t of types) console.log((t.match * 100).toFixed(2).padStart(6) + '% ' + t.type.description); Defs.match(result, types[0].type); // const stats = Defs.match(result, types[0].type); // console.log('Stats:', stats); console.log('Parsed as:', result.def); // const type = searchType(process.argv[2]); // const stats = applyDef(result, type);}console.log(print(result));// console.log('Stats:', (stats.recognized * 100 / stats.total).toFixed(2) + '%');// // print(result, searchType(process.argv[2]), stats);// // console.log('Defs:', stats.defs);