c# - 得到错误 : "Specified block size is not valid for this algorithm" while initialize AesCryptoProvider

Question

我正在尝试为 AES 加密使用更大的 block 大小:

private static void EncryptFile(string inFile, RSACryptoServiceProvider rsaPublicKey)
{
    using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
    {
        // Create instance of AesManaged for
        // symetric encryption of the data.
        aes.KeySize = 256;

        // Allocating 64K
        aes.BlockSize = 8 * 1024 * 64; 
    }
}

并遇到以下异常:

System.Security.Cryptography.CryptographicException was unhandled
Message=Specified block size is not valid for this algorithm.
Source=mscorlib StackTrace: at System.Security.Cryptography.SymmetricAlgorithm.set_BlockSize(Int32 value) at ConsoleApplication4.Program.EncryptFile(String inFile, RSACryptoServiceProvider rsaPublicKey) in C:\Projects\ConsoleApplication4\Program.cs:line 117

我确实遗漏了一些明显的东西，有什么线索吗？

Answer 1

似乎 AES 只支持等于 128 的 block 大小。看来您可以通过将数据处理为多个 block 来解决这个问题。

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