How to use the jsrsasign.ASN1HEX function in jsrsasign

(pkFields[i].value + "\n").padStart(
                    18 - (pkFields[i].key.length + 3) + pkFields[i].value.length + 1,
                    " "
                );
        }

        // Signature fields
        let breakoutSig = false;
        try {
            breakoutSig = r.ASN1HEX.dump(sig).indexOf("SEQUENCE") === 0;
        } catch (err) {
            // Error processing signature, output without further breakout
        }

        if (breakoutSig) { // DSA or ECDSA
            sigStr = "  r:              " + PublicKey._formatByteStr(r.ASN1HEX.getV(sig, 4), 16, 18) + "\n" +
                "  s:              " + PublicKey._formatByteStr(r.ASN1HEX.getV(sig, 48), 16, 18);
        } else { // RSA or unknown
            sigStr = "  Signature:      " + PublicKey._formatByteStr(sig, 16, 18);
        }


        let issuerStr = PublicKey._formatDnStr(issuer, 2),
            nbDate = PublicKey._formatDate(cert.getNotBefore()),
            naDate = PublicKey._formatDate(cert.getNotAfter()),
            subjectStr = PublicKey._formatDnStr(subject, 2);

        return `Version:          ${cert.version} (0x${Utils.hex(cert.version - 1)})
Serial number:    ${new r.BigInteger(sn, 16).toString()} (0x${sn})
Algorithm ID:     ${cert.getSignatureAlgorithmField()}
Validity
  Not Before:     ${nbDate} (dd-mm-yy hh:mm:ss) (${cert.getNotBefore()})

});
        }

        // Format Public Key fields
        for (let i = 0; i < pkFields.length; i++) {
            pkStr += "  " + pkFields[i].key + ":" +
                (pkFields[i].value + "\n").padStart(
                    18 - (pkFields[i].key.length + 3) + pkFields[i].value.length + 1,
                    " "
                );
        }

        // Signature fields
        let breakoutSig = false;
        try {
            breakoutSig = r.ASN1HEX.dump(sig).indexOf("SEQUENCE") === 0;
        } catch (err) {
            // Error processing signature, output without further breakout
        }

        if (breakoutSig) { // DSA or ECDSA
            sigStr = "  r:              " + PublicKey._formatByteStr(r.ASN1HEX.getV(sig, 4), 16, 18) + "\n" +
                "  s:              " + PublicKey._formatByteStr(r.ASN1HEX.getV(sig, 48), 16, 18);
        } else { // RSA or unknown
            sigStr = "  Signature:      " + PublicKey._formatByteStr(sig, 16, 18);
        }


        let issuerStr = PublicKey._formatDnStr(issuer, 2),
            nbDate = PublicKey._formatDate(cert.getNotBefore()),
            naDate = PublicKey._formatDate(cert.getNotAfter()),
            subjectStr = PublicKey._formatDnStr(subject, 2);

runParseAsn1HexString: function(input, args) {
        let truncateLen = args[1],
            index = args[0];
        return r.ASN1HEX.dump(input.replace(/\s/g, ""), {
            "ommitLongOctet": truncateLen
        }, index);
    },