org.catools.common.security.CCipher Maven / Gradle / Ivy

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The common objects which use in all other CATools projects

There is a newer version: 2.0.0

package org.catools.common.security;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

public class CCipher {
    public static String decrypt(String strToDecrypt, String secret) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, getEncryptionKey(secret));
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } catch (Exception e) {
            throw new CCipherException("decrypt", strToDecrypt, e);
        }
    }

    public static String encrypt(String strToEncrypt, String secret) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, getEncryptionKey(secret));
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
        } catch (Exception e) {
            throw new CCipherException("encrypt", strToEncrypt, e);
        }
    }

    private static SecretKeySpec getEncryptionKey(String myKey) throws NoSuchAlgorithmException {
        MessageDigest sha;
        byte[] key = myKey.getBytes(StandardCharsets.UTF_8);
        sha = MessageDigest.getInstance("SHA-1");
        key = sha.digest(key);
        key = Arrays.copyOf(key, 16);
        return new SecretKeySpec(key, "AES");
    }
}