Java:如何解码在php上使用已知密钥加密的字符串 - Java: How to decode string encrypted on php with known key?

Java: How to decode string encrypted on php with known key?

所以我在php服务器上加密了一个字符串。

encrypt("http://google.com", "happy");
function encrypt($str, $key)
{
    $block = mcrypt_get_block_size('des', 'ecb');
    $pad = $block - (strlen($str) % $block);
    $str .= str_repeat(chr($pad), $pad);
    return mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
}

顺便说一句，这会返回一些奇怪的字符串。。。我期待着字母和数字：ZöÞ ÔP»8

回到Java，我需要用密钥解密这个字符串。

这可能有助于java:中的MCrypt

http://www.java2s.com/Open-Source/Java-Document/EJB-Server/resin-4.0.7/com/caucho/quercus/lib/mcrypt/Mcrypt.java.htm

另一个链接：

http://www.kanatorn.info/2011/11/07/aes-encrypt-decrypt-between-java-php/

我不喜欢mcrypt，但通过加密运行ASCII明文并不总是产生ASCII密文。当你试图将生成的加密密文解释为ASCII或unicode文本时，很可能会将其转换为"奇怪的字符串"。

首先，确保它不是单向加密。其次，php中使用的算法和参数以及java

中的逆向工程

我认为这会很有用。请注意，字符集是UTF-8。

public class Foo {
    public static void main(String[] args) {
        try {
            String cipherSpec = "DES/ECB/NoPadding";
            Cipher cipher = Cipher.getInstance(cipherSpec);
            int blockSize = cipher.getBlockSize();
            String keyText = "happy";
            Key key = new SecretKeySpec(padRight(keyText, blockSize).getBytes("UTF-8"), "DES");
            String input = "http://google.com";
                   input = padRight(input, input.length() + blockSize - (input.length() % blockSize));
            // encrypt
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] cipherText = cipher.doFinal(input.getBytes(CHARSET));
            System.out.println("'ncipher text: ");
            System.out.println(new String(cipherText, CHARSET));
            // decrypt
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] plainText = cipher.doFinal(cipherText);
            System.out.println("'nplain text: ");
            System.out.println(new String(plainText, CHARSET));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    final static String CHARSET = "UTF-8";
    static String padRight(String s, int n) {
        return String.format("%1$-" + n + "s", s);
    }
}