IllegalArgumentException ChaCha20需要128位或256位密钥 [英] IllegalArgumentException ChaCha20 requires 128 bit or 256 bit key

问题描述

如何将字符串转换为128或256位的chacha20加密密钥。

How could I convert String to 128 or 256 bit key for chacha20 Encryption .

    ChaCha20Encryptor chaCha20Encryptor = new ChaCha20Encryptor();
    byte[] data = chaCha20Encryptor.encrypt(plaintext.getBytes(),key2.getBytes());
    String enStr = BaseUtilityHelper.encodeBase64URLSafeString(data);
    encryptedTv.setText(enStr);

ChaCha20Encryptor

public class ChaCha20Encryptor implements Encryptor {

    private final byte randomIvBytes[] = {0, 1, 2, 3, 4, 5, 6, 7};

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    @Override
    public byte[] encrypt(byte[] data, byte[] randomKeyBytes) throws IOException, InvalidKeyException,
            InvalidAlgorithmParameterException, InvalidCipherTextException {

        ChaChaEngine cipher = new ChaChaEngine();
        cipher.init(true, new ParametersWithIV(new KeyParameter(randomKeyBytes), randomIvBytes));

        byte[] result = new byte[data.length];
        cipher.processBytes(data, 0, data.length, result, 0);
        return result;
    }

    @Override
    public byte[] decrypt(byte[] data, byte[] randomKeyBytes)
            throws InvalidKeyException, InvalidAlgorithmParameterException, IOException,
            IllegalStateException, InvalidCipherTextException {

        ChaChaEngine cipher = new ChaChaEngine();
        cipher.init(false, new ParametersWithIV(new KeyParameter(randomKeyBytes), randomIvBytes));

        byte[] result = new byte[data.length];
        cipher.processBytes(data, 0, data.length, result, 0);
        return result;
    }

    @Override
    public int getKeyLength() {
        return 32;
    }

    @Override
    public String toString() {
        return "ChaCha20()";
    }
}

其中

private String key2 = "19920099-564A-4869-99B3-363F8145C0BB";
private String plaintext = "Hello";

我也尝试过不同的键。但它需要key2将其转换为128位或256位。我在SO上搜索过。并找到一些链接

I have also tried different keys. but it requires key2 to convert it to 128 or 256 bits. I have searched on SO. and find some links

Java 256位AES密码加密

将字符串转换为AES的128位密钥

但这些看起来不像我的要求

but these doesn't look like relevant to my requirement

推荐答案

您的密钥，没有破折号，是一个完全有效的128位十六进制密钥。它是32个字符，它是16个字节=> 128位。

Your key, without the dashes, is a perfectly valid 128 bits hexadecimal key. It is 32 characters, which is 16 bytes => 128 bits.

所有你需要做的是：

1. 删除破折号 key2.replace（ - ，）;


2. 将十六进制字符串转换为其byte []表示形式。我个人使用了$ 1.7以上的 javax.xml.bind.DatatypeConverter 。使用如下： DatatypeConverter.parseHexBinary（hexString）;

1. remove the dashes key2.replace("-","");
2. Convert the hexadecimal String to its byte[] representation. I personally use javax.xml.bind.DatatypeConverter available for java 1.7 and above. Use it like this : DatatypeConverter.parseHexBinary(hexString);

您的完整调用应该如下所示：

Your complete call should look like this :

chaCha20Encryptor.encrypt(
             plaintext.getBytes(),
             DatatypeConverter.parseHexBinary(key2.replace("-","")));

这篇关于IllegalArgumentException ChaCha20需要128位或256位密钥的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！