ru.tinkoff.acquiring.sdk.CryptoUtils Maven / Gradle / Ivy

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Library which allows you to use internet acquiring in your android app

There is a newer version: 4.3.0

/*
 * Copyright © 2016 Tinkoff Bank
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ru.tinkoff.acquiring.sdk;

import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import ru.tinkoff.acquiring.sdk.utils.Base64;

/**
 * @author Mikhail Artemyev
 */
public class CryptoUtils {

    public static String sha256(final String string) {
        if (string == null) {
            throw new IllegalArgumentException("Argument cannot be null");
        }

        try {
            final MessageDigest digest = MessageDigest.getInstance("SHA-256");
            final byte[] hash = digest.digest(string.getBytes("UTF-8"));
            final StringBuffer hexString = new StringBuffer();

            for (int i = 0; i < hash.length; i++) {
                final String hex = Integer.toHexString(0xff & hash[i]);
                if (hex.length() == 1) hexString.append('0');
                hexString.append(hex);
            }

            return hexString.toString();
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static byte[] encryptRsa(final String string, final PublicKey publicKey) {
        try {
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            return cipher.doFinal(string.getBytes());
        } catch (NoSuchPaddingException | InvalidKeyException | NoSuchAlgorithmException |
                BadPaddingException | IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        }
    }

    public static String encodeBase64(final byte[] value) {
        return Base64.encodeToString(value, Base64.DEFAULT).trim();
    }


}