import crypto from "crypto"; const ALGORITHM = "aes256"; const INPUT_ENCODING = "utf8"; const OUTPUT_ENCODING = "hex"; const IV_LENGTH = 16; // AES blocksize /** * * @param text Value to be encrypted * @param key Key used to encrypt value must be 32 bytes for AES256 encryption algorithm * * @returns Encrypted value using key */ export const symmetricEncrypt = function (text: string, key: string) { const _key = Buffer.from(key, "latin1"); const iv = crypto.randomBytes(IV_LENGTH); const cipher = crypto.createCipheriv(ALGORITHM, _key, iv); let ciphered = cipher.update(text, INPUT_ENCODING, OUTPUT_ENCODING); ciphered += cipher.final(OUTPUT_ENCODING); const ciphertext = iv.toString(OUTPUT_ENCODING) + ":" + ciphered; return ciphertext; }; /** * * @param text Value to decrypt * @param key Key used to decrypt value must be 32 bytes for AES256 encryption algorithm */ export const symmetricDecrypt = function (text: string, key: string) { const _key = Buffer.from(key, "latin1"); const components = text.split(":"); const iv_from_ciphertext = Buffer.from(components.shift() || "", OUTPUT_ENCODING); const decipher = crypto.createDecipheriv(ALGORITHM, _key, iv_from_ciphertext); let deciphered = decipher.update(components.join(":"), OUTPUT_ENCODING, INPUT_ENCODING); deciphered += decipher.final(INPUT_ENCODING); return deciphered; };