在php和java之间使用不同的AES128,填充加密为零

时间:2014-10-09 04:21:38

标签: java php encryption aes

我在使用零填充且没有IV加密的AES128时,java和php方法之间有不同的结果。

这里是PHP代码:

<?php
$ptaDataString = "secretdata";
$ptaDataString = encryptData($ptaDataString);
$ptaDataString = base64_encode($ptaDataString);
function encryptData($input) {
                $ptaKey = 'secret'; 
                $iv = "\0";
                $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $ptaKey, $input, MCRYPT_MODE_CBC, $iv);
                return $encrypted;
}
echo $ptaDataString;
?>

这是java代码:

public static String encrypt() throws Exception {
    try {
        String data = "secretdata";
        String key = "secret0000000000";
        String iv = "0000000000000000";

        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        int blockSize = cipher.getBlockSize();

        byte[] dataBytes = data.getBytes();
        int plaintextLength = dataBytes.length;
        if (plaintextLength % blockSize != 0) {
            plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
        }

        byte[] plaintext = new byte[plaintextLength];
        System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

        SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

        cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
        byte[] encrypted = cipher.doFinal(plaintext);

        return new sun.misc.BASE64Encoder().encode(encrypted);

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

php结果:kjgE5p / 3qrum6ghdjiVIoA ==

Java结果:zLKhVMksRRr1VHQigmPQ2Q ==

任何帮助将不胜感激, 感谢

1 个答案:

答案 0 :(得分:3)

在Java中,表示为字符串的零字节为"\0"而非"0"。如果您按如下方式更正示例,则结果匹配:

String data = "secretdata";
String key = "secret\0\0\0\0\0\0\0\0\0\0";
String iv = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";

对于IV,它可能更容易编写:

byte[] iv = new byte[<block size>];

在代码的最后一行,您可以访问sun.misc.BASE64Encoder()。访问以sun.*开头的任何内容都是不受欢迎的,因为这些是内部类。请考虑使用:

return DatatypeConverter.printBase64Binary(encrypted);