eckey2hex

#!/usr/bin/env node

/*
 * eckey2hex - read PKCS#1/5/8 PEM EC private or public key and show key in hexadecimal
 *
 * Copyright (c) 2020 Kenji Urushima (kenji.urushima@gmail.com)
 *
 * This software is licensed under the terms of the MIT License.
 * https://kjur.github.io/jsrsasign/license
 *
 * The above copyright and license notice shall be 
 * included in all copies or substantial portions of the Software.
 * 
 * Please use '-h' option for this script usage.
 * ---------------------------------------------------------
 * DESCRIPTION
 *   read PKCS#1/5/8 PEM EC private or public key and show key in hexadecimal
 *
 * USAGE
 *   % eckey2hex private.key
 *   private key = 1234abcd...
 *   public key = 04abcd...
 *   % eckey2hex public.key
 *   public key = 04abcd...
 */

var program = require('commander');
var rs = require('jsrsasign');
var rsu = require('jsrsasign-util');
var path = require('path');

program
  .version('1.0.0 (2020-APr-12)')
  .description('read EC key and show key in hexadecimal string')
  .usage(' ec-key-file')
  .parse(process.argv);

if (program.args.length != 1)
  throw "wrong number of arguments";

var inFile = program.args[program.args.length - 1];

var pem;
try {
  pem = rsu.readFile(inFile);
} catch (ex) {
  throw "can't read file: " + inFile
}

var key = rs.KEYUTIL.getKey(pem);
if (key instanceof rs.KJUR.crypto.ECDSA) {
  if (key.prvKeyHex != null)
    console.log("private key = " + key.prvKeyHex);
  if (key.pubKeyHex != null)
    console.log("public key = " + key.pubKeyHex);
}