var crypto = require("crypto");

const EXTRACT_PUBLIC_KEYS = new RegExp(
 "-----BEGIN [A-Z\x20]*PUBLIC[A-Z\x20]*-----([^-]*)-----END [A-Z\x20]*-----",
    "g"
);

function getPublicKeysFromPem(pem) {
  const publicKeys = [];
  let match;

  while ((match = EXTRACT_PUBLIC_KEYS.exec(pem)) !== null) {
    const key = crypto.createPublicKey(match[0]);
    if (!key.asymmetricKeyType) {continue;}
    publicKeys.push([key,key.asymmetricKeyType]);
  }

  return publicKeys;
}

  let rsaKeyValue = '';
  let dsaKeyValue = '';
  let ecKeyValue = '';
  let publicKeys = utils.getPublicKeysFromPem(publicCert);
  publicKeys.forEach(([key,type]) => {
    switch (type) {
      case "rsa": {
        const {n: modulus, e: exponent} = key.export({format: 'jwk'});
        rsaKeyValue += `<${prefix}RSAKeyValue><${prefix}Modulus>${modulus}</${prefix}Modulus><${prefix}Exponent>${exponent}</${prefix}Exponent></${prefix}RSAKeyValue>`;
        break;
      }
      case "dsa": {
        const {p: p, q: q, g: g, y: y} = key.export({format: 'jwk'});
        dsaKeyValue += `<${prefix}DSAKeyValue><${prefix}P>${p}</${prefix}P><${prefix}Q>${q}</${prefix}Q><${prefix}G>${g}</${prefix}G><${prefix}Y>${y}</${prefix}Y></${prefix}DSAKeyValue>`;
        break;
      }
      case "ec": {
        const {crv: crv, x: x, y: y} = key.export({format: 'jwk'});
        ecKeyValue += `<${prefix}ECKeyValue><${prefix}NamedCurve URI="urn:oid:${crv}"/><${prefix}PublicKey><${prefix}X>${x}</${prefix}X><${prefix}Y>${y}</${prefix}Y></${prefix}PublicKey></${prefix}ECKeyValue>`;
        break;
      }
    }});