問題描述
出于某些原因，我需要使用 256 位塊大小而不是使用 128 位塊大小的 AES 來實現 Rijndael 解/壓縮(原因:數據在 PHP 中使用 Rijndael 進行加密...).
For certain reasons I need to implement Rijndael de/compression with a blocksize of 256 bits instead of AES which uses a block size of 128 bits (reason: data is encrypted in PHP using Rijndael...).
如何更改密碼的塊大小?
How can I change the block-size for a cipher?
如果我只是用 "RIJNDAEL/CFB/PKCS5Padding" 得到一個密碼并嘗試用 256 位初始化一個 IV，我會得到一個異常，因為塊大小只有 128 位.p>
If i just get a cipher with "RIJNDAEL/CFB/PKCS5Padding" and try to initialize a IV with 256 bits I get an exception, because the block-size is only 128 bits.
推薦答案
除了 128 位塊大小的 Rijndael 之外，任何 Sun JCE 提供程序都不支持:這是 AES 算法.要獲得 256 位塊大小的 rijndael，您將不得不去其他地方.我建議使用 Bouncycastle java 庫.RijndaelEngine 類有一個構造函數接受以位為單位的塊大小.大多數人發現 PaddedBufferedBlockCipher 類與合適的填充一起使用時更方便，例如
There is no support in any of the Sun JCE providers for anything other than Rijndael with the 128-bit blocksize: this is the AES algorithm. To get rijndael with the 256-bit blocksize you will have to go somewhere else. I suggest the Bouncycastle java library. The RijndaelEngine class has a constructor that accepts a block size in bits. Most people find the PaddedBufferedBlockCipher class to be more convenient when used with suitable padding, e.g.
PaddedBufferedBlockCipher c = new PaddedBufferedBlockCipher(new RijndaelEngine(256), new PKCS7Padding());
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