cal.pub0.org/packages/lib/crypto.ts

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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;
};