Java中的十六进制密钥,IV和数据的AES加密

时间:2015-02-03 09:54:02

标签: java encryption aes

我必须使用密钥和IV加密十六进制字符串,也作为十六进制数据。请找到我在下面使用的代码。问题是我需要加密的字符串是纯文本。我需要将明文转换为Hex,我不知道该怎么做。任何人都可以帮助我吗?

我一直在确认使用webtool,

http://aes.online-domain-tools.com/

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");
}

对于我应该得到的上述数据,

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

但是我得到了,

e3 62 34 3f ad 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

先谢谢。

1 个答案:

答案 0 :(得分:1)

从中可以学到的最好的事情是,现代操作模式(如CBC(以及底层分组密码))对二进制数据进行操作,通常以一组字节形式提供。

从这个意义上讲,最好尽可能地坚持二进制数据。不要使用比严格必要的转换更多的转换,并且如果它仅供人类使用,则仅使用十六进制编码。如果您需要使用基于文本的表示传输二进制文件,则可以使用Base 64编码。

编码/解码最好使用Apache Commons Codec,Guava,Bouncy Castle等库来执行,Java 8仍然没有十六进制编码/解码字节数组(叹气)。


我创建了一个小代码示例,它输出十六进制格式,好像它是一个Java字节数组文字。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);
}