Voucher History

const CryptoJS = require('crypto-js');

const decryptMerchantVouchers = async ({ encryptedVouchers, apiKey, apiSecret }) => {
    // Create the same combined key used for encryption
    const combinedKey = CryptoJS.SHA256(apiKey + apiSecret).toString();

    // Decrypt using the combined key
    const bytes = CryptoJS.AES.decrypt(encryptedVouchers, combinedKey);
    const decryptedVouchers = bytes.toString(CryptoJS.enc.Utf8);
    return decryptedVouchers;
}

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.util.Base64;

public class VoucherDecryptor {

    public static String decryptMerchantVouchers(String encryptedVouchers, String apiKey, String apiSecret) throws Exception {
        // Create the combined key using SHA-256
        String combined = apiKey + apiSecret;
        MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
        byte[] combinedKey = sha256.digest(combined.getBytes("UTF-8"));

        // Decode the base64-encoded encrypted string
        byte[] encryptedData = Base64.getDecoder().decode(encryptedVouchers);

        // Extract IV (first 16 bytes) and ciphertext
        byte[] iv = new byte[16];
        byte[] ciphertext = new byte[encryptedData.length - 16];
        System.arraycopy(encryptedData, 0, iv, 0, 16);
        System.arraycopy(encryptedData, 16, ciphertext, 0, ciphertext.length);

        // Set up AES cipher
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec keySpec = new SecretKeySpec(combinedKey, "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

        // Decrypt the ciphertext
        byte[] decryptedBytes = cipher.doFinal(ciphertext);
        return new String(decryptedBytes, "UTF-8");
    }
}