CheckTelegramAuthorizationData.java

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.codec.digest.HmacUtils;

private Boolean isTelegramAccountDataRight(
        String telegramAccountData, // data check string
        String telegramBotToken // bot token
) { 
    byte[] data = telegramAccountData.toString().getBytes();
    byte[] secret = DigestUtils.sha256(telegramBotToken);

    String hashParam = telegramAccount.getHash();
    String hash = HmacUtils.hmacSha256Hex(secret, data);

    return hash.equals(hashParam);
}