1gr40Wxh

1package com.alexsomai.blog.crypto;
2
3import com.alexsomai.blog.util.SerializationUtil;
4import org.bouncycastle.crypto.Digest;
5import org.bouncycastle.crypto.InvalidCipherTextException;
6import org.bouncycastle.crypto.digests.SHA256Digest;
7import org.bouncycastle.crypto.engines.AESEngine;
8import org.bouncycastle.crypto.modes.CBCBlockCipher;
9import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
10import org.bouncycastle.crypto.params.KeyParameter;
11import org.bouncycastle.util.encoders.Hex;
12import org.springframework.beans.factory.annotation.Value;
13import org.springframework.stereotype.Component;
14
15import java.nio.charset.StandardCharsets;
16
17@Component
18public class CipherServiceImpl implements CipherService {
19
20    @Value("${cipher.service.secret-key}")
21    private String secretKey;
22
23    ...
24
25    private byte[] applyAlgorithm(byte[] inputBytes, boolean forEncryption) {
26        PaddedBufferedBlockCipher paddedBufferedBlockCipher = initPaddedBufferedBlockCipher(forEncryption);
27
28        byte[] outputBytes = new byte[paddedBufferedBlockCipher.getOutputSize(inputBytes.length)];
29        int outputLength = paddedBufferedBlockCipher.processBytes(inputBytes, 0, inputBytes.length, outputBytes, 0);
30
31        try {
32            paddedBufferedBlockCipher.doFinal(outputBytes, outputLength);
33        } catch (InvalidCipherTextException e) {
34            throw new RuntimeException("Exception occurred while encrypting/decrypting the object");
35        }
36
37        return outputBytes;
38    }
39
40    private PaddedBufferedBlockCipher initPaddedBufferedBlockCipher(boolean forEncryption) {
41        PaddedBufferedBlockCipher bufferedBlockCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()));
42
43        KeyParameter keyParameter = new KeyParameter(secretKey.getBytes(StandardCharsets.UTF_8));
44        bufferedBlockCipher.init(forEncryption, keyParameter);
45
46        return bufferedBlockCipher;
47    }
48}