Function symEncrypt

src/modules/crypto.js:26–51

(msg, passphrase)

 * @return {openpgp.Message} new message with encrypted content
 */
export async function symEncrypt(msg, passphrase) {
  if (!passphrase) {
    throw new Error('The passphrase cannot be empty!');
  }
  const sessionKeyAlgorithm = enums.symmetric.aes256;
  const packetlist = new PacketList();
  // create a Symmetric-key Encrypted Session Key (ESK)
  const symESKPacket = new SymEncryptedSessionKeyPacket();
  symESKPacket.version = 4;
  symESKPacket.sessionKeyAlgorithm = sessionKeyAlgorithm;
  // call encrypt one time to init S2K
  await symESKPacket.encrypt('123456');
  symESKPacket.sessionKey = null;
  symESKPacket.encrypted = null;
  // call decrypt to generate the session key
  await symESKPacket.decrypt(passphrase);
  packetlist.push(symESKPacket);
  // create integrity protected packet
  const symEncryptedPacket = new SymEncryptedIntegrityProtectedDataPacket();
  symEncryptedPacket.packets = msg.packets;
  await symEncryptedPacket.encrypt(sessionKeyAlgorithm, symESKPacket.sessionKey);
  packetlist.push(symEncryptedPacket);
  // remove packets after encryption
  symEncryptedPacket.packets = new PacketList();
  return new Message(packetlist);
}

/**
 * Return a secure random number in the specified range