Java中的错误AES密码

Question

我尝试在 Java 中使用 AES。 我找到了一个代码片段，但输出是错误的。 输出中有很多EF BF BD 。 我找不到我的代码有什么问题？

public class AES
{
static String encryptionKey = "48C3B4286FF421A4A328E68AD9E542A4";
    static String clearText = "00000000000000000000000000000000";

    public static void main(String[] args) throws UnsupportedEncodingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException
    {
        encr();
    }

    public static String toHexString(byte[] ba)
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < ba.length; i++)
        {
            sb.append(String.format("%02X ", ba[i]));
        }
        return sb.toString();
    }

    public static void encr() throws InvalidKeyException, UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException
    {
        //Security.addProvider(new com.sun.crypto.provider.SunJCE());
        SecretKeySpec secretKey = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");

        byte[] clearTextBytes = clearText.getBytes("UTF8");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] cipherBytes = cipher.doFinal(clearTextBytes);

        System.out.print("enc1:  ");
        for (int i = 0; i < cipherBytes.length; i++)
        {
            System.out.print(cipherBytes[i]);
        }
        System.out.println("");

        String cipherText = new String(cipherBytes, "UTF8");
        System.out.println("enc2: " + cipherText);

        System.out.println("enc3: " + toHexString(cipherText.getBytes("UTF-8")));
    }
}

输出是：

enc1:  51 72 -122 -57 -109 127 57 85 116 63 -89 -35 55 -72 37 -96 51 72 -122 -57 -109 127 57 85 116 63 -89 -35 55 -72 37 -96 -82 103 -117 -60 -102 -91 -51 55 -53 23 33 -82 -70 -14 74 41 
enc2: 3H�Ǔ9Ut?��7�%�3H�Ǔ9Ut?��7�%��g�Ě��7�!���
enc3: 33 48 EF BF BD C7 93 7F 39 55 74 3F EF BF BD EF BF BD 37 EF BF BD 25 EF BF BD 33 48 EF BF BD C7 93 7F 39 55 74 3F EF BF BD EF BF BD 37 EF BF BD 25 EF BF BD EF BF BD 67 EF BF BD C4 9A EF BF BD EF BF BD 37 EF BF BD 17 21 EF BF BD EF BF BD EF BF BD 

但应该是

33  48  86  c7  93  7f  39  55  74  3f  a7  dd  37  b8  25  a0

Answer 1

如果打印toHexString(cipherText.getBytes("UTF-8")) ，结果是

33 48 86 C7 93 7F 39 55 74 3F A7 DD 37 B8 25 A0 33 48 86 C7 93 7F 39 55 74 3F A7 DD 37 B8 25 A0 AE 67 8B 1 A CB 4 A 2AE 7 BA 2 BA 7 BA 2

当您将byte[]转换为String ，java 会根据字符集删除无效数据。