解密PHP中的as3crypto加密文本 [英] decrypt a as3crypto encrypted text in PHP
问题描述
我试图通过演示程序加密as3crypto中的文本。
i tried to encrypt a text in as3crypto via the demo app.
现在我试图通过php解密加密的文本，但似乎文本不是妥善解密。有谁知道如何通过PHP正确解密？还是我做错了？请启发我...
now i am trying to decrypt the crypted text via php but it seems that the text is not properly decrypted. has anyone know how to properly decrypt it via PHP? or am I doing it wrong? please enlighten me...
这里是这种情况：
-
在 http://crypto.hurlant.com/demo/ 中进行加密：
加密： AES
模式： CBC
padding： none
键： 11918f8bcd112e92744125008722050c
key: 11918f8bcd112e92744125008722050c
文字： Lorem ipsum dolor sit amet，consectetur adipiscing elit。
text: Lorem ipsum dolor sit amet, consectetur adipiscing elit. In ut massa nec purus laoreet posuere quis vitae tortor.
初始化向量： 将其留空
按加密。选择base64并复制密文。
press encrypt. select base64 and copy the cipher text.
制作一个具有这些代码并运行它的PHP脚本：
make a php script that has these codes and run it:
$ cipher = MCRYPT_RIJNDAEL_128;
$cipher = MCRYPT_RIJNDAEL_128;
$ mode = MCRYPT_MODE_CBC;
$mode = MCRYPT_MODE_CBC;
$ key =11918f8bcd112e92744125008722050c;
$key = "11918f8bcd112e92744125008722050c";
$ cipher =PLACE CIPHER TEXT HERE ...;
$cipher = "PLACE CIPHER TEXT HERE...";
$ data = base64_decode（$ cipher）;
$data = base64_decode($cipher);
echo mcrypt_decrypt（$ cipher，$ key，$ data ，$ mode）;
echo mcrypt_decrypt($cipher, $key, $data, $mode);
推荐答案
这个问题可能在于你的钥匙。虽然你可以将一个十六进制字符串提供给as3crypto，它会知道该怎么做， mcrypt_decrypt 会将每个字符解释为它的底层ASCII值（如a = 97），而不是它是十六进制值（a = 10）。使用 hex2bin 方法将十六进制字符串转换为字节字符串，并解密应该可以正常工作。
the issue probably lies in your key. While you can feed a hex string to as3crypto and it will know what do to with it, mcrypt_decrypt will interpret each character as it's underlying ASCII value (like a = 97) instead of it's hexadecimal value (a = 10). Use the hex2bin method to convert the hex string into a byte string, and your decryption should probably work fine.
还有一个问题可能在于as3crypto和php之间的默认IV（初始化向量）的不同想法。既然你使用CBC模式，你应该指定一个IV，就像一个很好的安全实践。还要注意与您的密钥类似的潜在陷阱，在as3中指定十六进制字符串，需要在php中转换。
also, an issue may rest with different ideas of a default IV (initialization vector) between as3crypto and php. Since you are using CBC mode, you should be specifying an IV, just as a good security practice. also be aware of the potential pitfalls similar to those with your key, of specifying a hex string in as3 and needing to convert it in php.
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