decrypt-example.ts

import TextManipulationHelper from './text-manipulation';
import CryptographyService from './cryptography.service';

const decrypt = async (cipherText: string, secretKey: string, initialVector: string) => {
  const keyBuffer = TextManipulationHelper.convertBase64ToStream(secretKey);
  const decryptionKey = await CryptographyService.parseKey(keyBuffer);

  const cipherBuffer = TextManipulationHelper.convertBase64ToStream(cipherText);
  
  const ivBuffer = TextManipulationHelper.convertBase64ToStream<Uint8Array>(initialVector);

  return await CryptographyService.decrypt(cipherBuffer, decryptionKey, ivBuffer)
};

const cipher = 'base64-encrypted-content';
const key = 'base64-encrpytion-key';
const iv = 'base64-initial-vector';

const plainText = decrypt(cipher, key, iv);
console.log(plainText);