gx-twofish64/dist/index.mjs

A library for encrypting and decrypting data using the Twofish algorithm and Base64 encoding. Based on the Genexus implementation (Encrypt64 and Decrypt64).

// src/index.ts
import { twofish as createTwofish } from "twofish";
var twofish = createTwofish();
function padToBlockSize(text) {
  const blockSize = 16;
  const encoder = new TextEncoder();
  const bytes = encoder.encode(text);
  const paddingNeeded = blockSize - bytes.length % blockSize;
  const paddedBytes = new Uint8Array(bytes.length + paddingNeeded);
  paddedBytes.set(bytes);
  for (let i = bytes.length; i < paddedBytes.length; i++) {
    paddedBytes[i] = 32;
  }
  return paddedBytes;
}
function unpadText(buffer) {
  const decoder = new TextDecoder("utf-8");
  return decoder.decode(buffer).trimEnd();
}
function hexToBytes(hex) {
  if (hex.length % 2 !== 0) throw new Error("Clave inv\xE1lida");
  const bytes = new Uint8Array(hex.length / 2);
  for (let i = 0; i < bytes.length; i++) {
    bytes[i] = parseInt(hex.substr(i * 2, 2), 16);
  }
  return bytes;
}
function encrypt64(text, hexKey) {
  const key = hexToBytes(hexKey);
  const input = padToBlockSize(text);
  const encrypted = new Uint8Array(input.length);
  for (let i = 0; i < input.length; i += 16) {
    const block = input.subarray(i, i + 16);
    const encryptedBlock = twofish.encrypt(key, block);
    encrypted.set(encryptedBlock, i);
  }
  return Buffer.from(encrypted).toString("base64");
}
function decrypt64(base64Text, hexKey) {
  const key = hexToBytes(hexKey);
  const input = Buffer.from(base64Text, "base64");
  const decrypted = new Uint8Array(input.length);
  for (let i = 0; i < input.length; i += 16) {
    const block = input.subarray(i, i + 16);
    const decryptedBlock = twofish.decrypt(key, block);
    decrypted.set(decryptedBlock, i);
  }
  return unpadText(decrypted);
}
export {
  decrypt64,
  encrypt64
};