Java AES CBC解密

Question

PHP加密功能

$privateKey = "1234567812345678";
$iv = "1234567812345678";
$data = "Test string";

$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $privateKey, $data, MCRYPT_MODE_CBC, $iv);

echo(base64_encode($encrypted));

Result: iz1qFlQJfs6Ycp+gcc2z4w==

当我尝试使用下面的函数在Java中解密这个结果时,我得到的所有内容都是ì š@ÔBKxnfÈ~¯Ô'M而我期待"测试字符串".我错的任何想法？谢谢

public static String decrypt() throws Exception{
    try{
        String Base64EncodedText = "iz1qFlQJfs6Ycp+gcc2z4w==";
        String decodedText = com.sun.xml.internal.messaging.saaj.util.Base64.base64Decode(Base64EncodedText);
        String key = "1234567812345678";
        String iv = "1234567812345678";

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

        javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("AES/CBC/NoPadding");
        cipher.init(javax.crypto.Cipher.DECRYPT_MODE, keyspec, ivspec);
        byte[] decrypted = cipher.doFinal(decodedText.getBytes());

        String str = new String(decrypted);

        return str;

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

Answer 1

编辑:从Java 8开始Java现在包含一个可接受的Base64类java.util.Base64.

这条线

String decodedText = com.sun.xml.internal.messaging.saaj.util.Base64.base64Decode(Base64EncodedText);

看起来不对劲 相反,使用apache commons编解码器类或Harder base64类.此外,mcrypt使用的默认填充,零填充,可以说是错误的,并且很难在其他语言中使用结果.mcrypt_encrypt网页的用户评论部分提供了如何执行此操作的示例.

这是一个使用apache commons类来解密字符串的小例子.

import java.nio.charset.Charset;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

public class AESToy3 {

    private static final Charset ASCII = Charset.forName("US-ASCII");

    public static void main(String[] args) throws Exception {
        String base64Cipher = "iz1qFlQJfs6Ycp+gcc2z4w==";
        byte [] cipherBytes = Base64.decodeBase64(base64Cipher);
        byte [] iv = "1234567812345678".getBytes(ASCII);
        byte [] keyBytes = "1234567812345678".getBytes(ASCII);

        SecretKey aesKey = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/NOPADDING");
        cipher.init(Cipher.DECRYPT_MODE, aesKey, new IvParameterSpec(iv));

        byte[] result = cipher.doFinal(cipherBytes);
        System.out.println(Hex.encodeHexString(result));
    }

}

这会产生以下输出:

5465737420737472696e670000000000

当解码为ASCII并删除尾随零时,它会给你 Test string