aiai.apps.commons.utils.SecUtils.java Source code

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Here is the source code for aiai.apps.commons.utils.SecUtils.java

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/*
 AiAi, Copyright (C) 2017 - 2018, Serge Maslyukov
    
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
    
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
    
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.
    
 */
package aiai.apps.commons.utils;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.StringUtils;

import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class SecUtils {

    public static final String SIGNATURE_DELIMITER = "###";

    public static String getSignature(String data, PrivateKey privateKey) throws GeneralSecurityException {
        return getSignature(data, privateKey, false);
    }

    public static String getSignature(String data, PrivateKey privateKey, boolean isChuncked)
            throws GeneralSecurityException {
        Signature signer = Signature.getInstance("SHA256withRSA");
        signer.initSign(privateKey);
        signer.update(data.getBytes(StandardCharsets.UTF_8));
        return StringUtils.newStringUsAscii(Base64.encodeBase64(signer.sign(), isChuncked));
    }

    public static PublicKey getPublicKey(String keyBase64)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        byte[] keyBytes = Base64.decodeBase64(keyBase64);
        X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        return kf.generatePublic(spec);
    }

    public static PrivateKey getPrivateKey(String keyBase64)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        byte[] keyBytes = Base64.decodeBase64(keyBase64);
        PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        return kf.generatePrivate(spec);
    }

}