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c# - AES 加密和输入字符串编码

问题描述

有人可以解释一下为什么这两段代码没有给出相同的结果，而第二个示例中的 StreamWriter 使用的是 UTF8 编码：

var TokenEncryptKey = "D268197CF891452844441A143AAEAAEB";
        var key = Encoding.UTF8.GetBytes(TokenEncryptKey);

        var alg = new RijndaelManaged();
        alg.Key = key;
        alg.Mode = CipherMode.ECB;

        var mem = new MemoryStream();

        CryptoStream encryptStream = new CryptoStream(mem, alg.CreateEncryptor(), CryptoStreamMode.Write);

        var validReservation = Encoding.UTF8.GetBytes("AAAAAAAAAAAAAAAAAAAAAAA");
        encryptStream.Write(validReservation, 0, validReservation.Length);
        encryptStream.Flush();
        encryptStream.FlushFinalBlock();

        Console.Out.WriteLine(Convert.ToBase64String(mem.GetBuffer(), 0, (int)mem.Length));

第二个例子

var TokenEncryptKey = "D268197CF891452844441A143AAEAAEB";
        var key = Encoding.UTF8.GetBytes(TokenEncryptKey);

        var alg = new RijndaelManaged();
        alg.Key = key;
        alg.Mode = CipherMode.ECB;

        var mem = new MemoryStream();

        CryptoStream encryptStream = new CryptoStream(mem, alg.CreateEncryptor(), CryptoStreamMode.Write);

        StreamWriter sw = new StreamWriter(encryptStream, Encoding.UTF8);
        sw.Write("AAAAAAAAAAAAAAAAAAAAAAA");
        sw.Flush();
        encryptStream.FlushFinalBlock();

        Console.Out.WriteLine(Convert.ToBase64String(mem.GetBuffer(), 0, (int)mem.Length));

标签： c#encryptioncharacter-encoding

解决方案

当您使用StreamWriter(encryptStream, Encoding.UTF8)时，这将添加 3 个字节的 Unicode BOM（字节顺序标记）。为避免这种情况，请new StreamWriter(m, new UTF8Encoding())改用。

Encoding.UTF8.GetBytes即使设置了编码来执行此操作，也不会添加 BOM - 如果需要，您可以使用它来检索它GetPreamble。

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