This is a pure JS implementation of ECDSA features for eMRTD certificates (ICAO 9303 p.12) with explicit ECC parameters
bun add github:li0ard/ecdsa_icaoimport { curveFromECParams } from "@li0ard/ecdsa_icao"
import { AsnConvert } from "@peculiar/asn1-schema"
import { CertificateChoices } from "@peculiar/asn1-cms"
import fs from "fs"
let certificate = AsnConvert.parse(fs.readFileSync("./cert.der"), CertificateChoices)
let curve = curveFromECParams(certificate.tbsCertificate.subjectPublicKeyInfo.parameters)