Java 部分解密字符串&；这是胡言乱语

我使用的嵌入式Derby需要

无填充

和

blockSize=8

字节，以及Bouncy Castle

在以下代码中，问题是：

加密的

字符串的
byteArray
长度为20字节。从DB检索到的
byteArray
长度为20字节，而
encryptBlock
值仅提供8字节的长度

即使是8个字节也是乱七八糟的

如何将IV嵌入密码文本

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3.嵌入IV的一般方法是使用它预先修复加密文本，它不需要保密。正如名称所述，

encryptBlock

处理一个在您的情况下为8字节的块，因为您使用64位段初始化了CFBsize@Artjom..Derby加密声明块大小应该是8字节…那么在这种情况下我应该如何解密所有数据？对不起，我不知道这段代码与Apache Derby有什么关系。AES的块大小为16字节。CFB模式可以将其转换为8字节的段大小。我看过一些文档，其中提到了DES和Blowfish，它们的块大小都是8字节。我不知道你想做什么，也不知道你为什么要写这段代码。@Artjom..谢谢…实际上Derby docs声明了块密码（BlockCipher，BitBlockSize）…我同意你的观点，问题在于密码初始化。。。

private CFBBlockCipher cipher() {

    secureRandom = new SecureRandom(KEY);
    byte[] randomBytes = new byte[32];
    secureRandom.nextBytes(randomBytes);

    kgp = new KeyGenerationParameters(secureRandom, 256);

    ckg = new CipherKeyGenerator();
    ckg.init(kgp);

    sk = ckg.generateKey();

    /* Initialize cipher parameters....with key & the IV */
    cipherParameters = new ParametersWithIV(new KeyParameter(sk), IVBYTES); //IVYTES array
    /*3- Generate the encryption & decryption ciphers*/
    CFBB = CFBBlockCipher(new AESEngine(), BITBLOCKSIZE); //BITBLOCKSIZE =64bit

    byte[] cfbbMoneyOneCurrentIV = CFBB.getCurrentIV();

    /*4- initialize the cipher*/
    CFBB.init(true, cipherParameters);

    return CFBB;
}

private void resetCipher() {
    if (CFBB != null) {
        CFBB.reset();
    }
}

private byte[] encrypt(CFBBlockCipher CFBB,String stringOne) {
    this.CFBB=CFBB;
    /*1- get the stream data to be ciphered*/            
        stringOneByteArray = stringOne.getBytes(StandardCharsets.UTF_8);

        toSaveByteArray = new byte[stringOneByteArray.length];
        int encryptBlock = CFBB.encryptBlock(stringOneByteArray, 0, toSaveByteArray, 0);
        System.out.println("encryptBlock length is :"+encryptBlock);          

    resetCipher();
    return toSaveByteArray;
}

private InputStream decrypt(CFBBlockCipher CFBB) {
    this.CFBB=CFBB;
    //connect to DB, get column data/
    String getData = "select moneyEditor from settingsTable where id=1";
    try {
        stmtOne = conn.createStatement();
        boolean execute = stmtOne.execute(getData);
        rsOne = stmtOne.getResultSet();
        while (rsOne.next()) {
            rsByteArray = rsOne.getBytes("moneyEditor");
            if (rsByteArray != null) {
                System.out.println("rsByteArray length is :" + rsByteArray.length);

                toSaveDecryptByteArray = new byte[rsByteArray.length];
                int decryptedByteArrayLength;
                decryptedByteArrayLength = CFBB.decryptBlock(rsByteArray, 0, toSaveDecryptByteArray, 0);
                System.out.println("decryptedByteArrayLength is :" + decryptedByteArrayLength);
                isFromDecoded = new ByteArrayInputStream(toSaveDecryptByteArray);

            } else {
                isFromDecoded = null;
            }
        }
        rsOne.close();
        resetCipher();
    } catch (SQLException ex) {
        Logger.getLogger(FrontFace.class.getName()).log(Level.SEVERE, null, ex);
    }
    return isFromDecoded;
}