ecc521.js

const commonEcc = require('./common-ecc')
const CURVE_NAME = 'secp521r1'
const HASH_TYPE = 'sha512'

module.exports = {
  curveName: CURVE_NAME,

  /**
   * Convert a PEM certificate to a JSON Web Key.
   *
   * @param {string|Buffer} privateOrPublicPem - The private or public PEM key.
   * @param {Array} privateKeyOps - The operations intended for the private key.
   * @param {Array} publicKeyOps - The operations intended for the public key.
   * @returns {Promise<Object>} The converted certificate.
   */
  convertPemToJwk: (privateOrPublicPem, privateKeyOps = [],
    publicKeyOps = []) => {
    return commonEcc.convertPemToJwk(
      CURVE_NAME, privateOrPublicPem, privateKeyOps, publicKeyOps)
  },

  /**
   * Convert a JSON Web Key to a PEM certificate.
   *
   * @param {string|Buffer} privateOrPublicJwk - The private or public JSON Web Key.
   * @returns {Promise<Object>} The converted certificate.
   */
  convertJwkToPem: (privateOrPublicJwk) => {
    return commonEcc.convertJwkToPem(CURVE_NAME, privateOrPublicJwk)
  },

  /**
   * Generate an ECDH key pair as a JSON Web Key.
   *
   * @param {Array} privateKeyOps - The operations intended for the private key.
   * @param {Array} publicKeyOps - The operations intended for the public key.
   * @returns {Promise<Object>} The ECDH key pair.
   */
  generateJwkKeyPair: (privateKeyOps = [], publicKeyOps = []) => {
    return commonEcc.generateJwkKeyPair(CURVE_NAME, privateKeyOps, publicKeyOps)
  },

  /**
   * Generate an ECDH key pair as PEM certificates.
   *
   * @returns {Promise<Object>} The PEM certificates.
   */
  generatePemKeyPair: () => {
    return commonEcc.generatePemKeyPair(CURVE_NAME)
  },

  /**
   * Sign a payload to prevent it from tamper.
   *
   * @param {string} payload - The payload to sign.
   * @param {string} privateKeyPem - The private key in PEM format.
   * @returns {Promise<string>} The signature for the payload.
   */
  signPayload: (payload, privateKeyPem) => {
    return commonEcc.signPayload(payload, privateKeyPem, HASH_TYPE)
  },

  /**
   * Verify the signature of a given payload.
   *
   * @param {string} payload - The payload against which the signature will be checked.
   * @param {string|Buffer} signature - The signature of the payload.
   * @param {Object} publicKeyPem - The public ECDH key in PEM format.
   * @returns {Promise<boolean>}
   */
  verifyPayloadSignature: (payload, signature, publicKeyPem) => {
    return commonEcc.verifyPayloadSignature(
      payload, signature, publicKeyPem, HASH_TYPE)
  },

  /**
   * Compute an ECDH shared secret.
   *
   * @param {Object} privatePemKey - The private ECDH key in PEM format.
   * @param {Object} otherPublicPemKey - The other public ECDH key in PEM format.
   * @returns {Promise<string>}
   */
  computeSecret: (privatePemKey, otherPublicPemKey) => {
    return commonEcc.computeSecret(CURVE_NAME, privatePemKey, otherPublicPemKey)
  }
}