Java 中十六进制密钥、IV 和数据的 AES 加密

Question

我必须使用密钥和 IV 将十六进制字符串加密为十六进制数据。请在下面找到我使用的代码。问题是我需要加密的字符串是明文。我需要将明文转换为十六进制，但我不知道该怎么做。谁能帮帮我？？

我一直在用webtool确认，

static byte[] IV = {  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };

static String plaintext = "00010101010102020202020303030303"; 

static byte[] encryptionKey = {0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
    0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41  };

public static void main(String[] args) {
    try {

        System.out.println("==Java==");
        System.out.println("plain:   " + plaintext);

        byte[] cipher = encrypt(plaintext, encryptionKey);

        System.out.print("cipher:  ");
        for (int i = 0; i < cipher.length; i++) {
            // System.out.print(new Integer(cipher[i]) + " ");
            byte b = cipher[i];
            System.out.print(String.format("%02x", b & 0xFF) + " ");

        }

        String decrypted = decrypt(cipher, encryptionKey);

        System.out.println("decrypt: " + decrypted);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static byte[] encrypt(String plainText, byte[] encryptionKey)
        throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    SecretKeySpec key = new SecretKeySpec(encryptionKey, "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV));
    return cipher.doFinal(plainText.getBytes("UTF-8"));
}

public static String decrypt(byte[] cipherText, byte[] encryptionKey)
        throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    SecretKeySpec key = new SecretKeySpec(encryptionKey, "AES");
    cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV));
    return new String(cipher.doFinal(cipherText), "UTF-8");
}

以上数据我应该得到，

b6 06 da b9 cd dc 2d 89 4b 49 0a ab 4e e7 dc 58

而是我得到了，

e3 62 34 3f 广告 8b 89 37 57 81 91 31 ee 79 49 52 26 bf 40 cb d0 ce 36 bd 8a 04 6b af 34 d9 f3 d7

提前致谢。

Answer 1

可能从中学到的最好的事情是 CBC（以及底层分组密码）等现代操作模式对二进制数据进行操作，通常以一组字节的形式提供。

从这个意义上讲，最好尽可能坚持使用二进制数据。不要使用比绝对必要更多的转换，并且仅在供人类使用时才使用十六进制编码。如果您需要使用基于文本的表示来传输二进制文件，则可以使用 Base 64 编码。

Encoding/decoding 最好使用 Apache Commons Codec、Guava、Bouncy Castle 等库来执行，Java 8 仍然不十六进制 encode/decode 字节数组（唉).

我创建了一个小代码示例，输出十六进制格式，就好像它是 Java 字节数组文字一样。我会留给你创建不同的版本。

static byte[] IV = {  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };

static byte[] plaintext = { 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03 }; 

static byte[] encryptionKey = {0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
    0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41  };

public static void main(String[] args) {
    try {

        System.out.println("==Java==");
        System.out.println("plain:   " + toJavaHex(plaintext));

        byte[] cipher = encrypt(plaintext, encryptionKey);

        System.out.println("cipher:  " + toJavaHex(cipher));

        String decrypted = toJavaHex(decrypt(cipher, encryptionKey));

        System.out.println("decrypt: " + decrypted);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static String toJavaHex(byte[] data) {
    StringBuilder sb = new StringBuilder(13 * data.length);
    for (int i = 0; i < data.length; i++) {
        if (i != 0) {
            sb.append(", ");
        }
        sb.append(String.format("(byte) 0x%02x", data[i]));
    }
    return sb.toString();
}

public static byte[] encrypt(byte[] plainText, byte[] encryptionKey)
        throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    SecretKeySpec key = new SecretKeySpec(encryptionKey, "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV));
    return cipher.doFinal(plainText);
}

public static byte[] decrypt(byte[] cipherText, byte[] encryptionKey)
        throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    SecretKeySpec key = new SecretKeySpec(encryptionKey, "AES");
    cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV));
    return cipher.doFinal(cipherText);
}

Java 中十六进制密钥、IV 和数据的 AES 加密

AES encryption for hex key, IV and data in Java

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