Question

有一种方法（ Version1 ）对输入流进行编码，并且有一个功能Decrypt（）可以成功解码编码数据。但是当输入数据很大时，可能会出现错误 OutOfMemory （在线＆＃34; 字符串textEncrypted = Convert.ToBase64String（ms.ToArray（））＆＃ 34。）

版本1

    private static Stream EncryptRijndael1(byte[] key, byte[] iv, Stream plainText)
    {
        if (plainText == null)
            return null;

        byte[] bytesEncrypted;

        RijndaelManaged rjndl = RijndaelManagedWithConfig(key, iv);

        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, rjndl.CreateEncryptor(key, iv), CryptoStreamMode.Write))
            {
                byte[] buffer = new byte[16 * 1024];
                int readed;
                while ((readed = (plainText.Read(buffer, 0, buffer.Length))) > 0)
                {
                    cs.Write(buffer, 0, readed);
                }
            }
            string textEncrypted = Convert.ToBase64String(ms.ToArray());
            bytesEncrypted = Encoding.ASCII.GetBytes(textEncrypted);
        }
        return new MemoryStream(bytesEncrypted);
    }

所以我修改了方法来逐个部分地处理数组（块）。这是版本2 。它会导致错误＆＃34;偏移量和长度必须引用字符串中的位置＆＃34; 行 Convert.ToBase64String（ms.ToArray（），offset，read）< /强>

版本2

private static Stream EncryptRijndael2(byte[] key, byte[] iv, Stream plainText) { if (plainText == null) return null; byte[] bytesEncrypted; RijndaelManaged rjndl = RijndaelManagedWithConfig(key, iv); string textEncrypted = String.Empty; using (MemoryStream ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, rjndl.CreateEncryptor(key, iv), CryptoStreamMode.Write)) { byte[] buffer = new byte[16 * 1024]; int readed; int offset = 0; while ((readed = (plainText.Read(buffer, 0, buffer.Length))) > 0) { cs.Write(buffer, 0, readed); textEncrypted += Convert.ToBase64String(ms.ToArray(), offset, readed); offset += readed; } } bytesEncrypted = Encoding.ASCII.GetBytes(textEncrypted); } return new MemoryStream(bytesEncrypted); }

然后我做了 Version3 。它的工作没有错误，但输出数据长度现在大于具有相同输入数据的 Version1 。 Decryt（）函数抛出错误＆＃34;输入不是有效的Base-64字符串，因为它包含非基本64字符，两个以上的填充字符或填充字符中的非法字符。＃34;

版本3

private static Stream EncryptRijndael3(byte[] key, byte[] iv, Stream plainText) { if (plainText == null) return null; byte[] bytesEncrypted; RijndaelManaged rjndl = RijndaelManagedWithConfig(key, iv); using (MemoryStream ms = new MemoryStream()) { string textEncrypted = String.Empty; using (CryptoStream cs = new CryptoStream(ms, rjndl.CreateEncryptor(key, iv), CryptoStreamMode.Write)) { byte[] buffer = new byte[16*1024]; int readed; while ((readed = (plainText.Read(buffer, 0, buffer.Length))) > 0) { cs.Write(buffer, 0, readed); } } byte[] buffer1 = new byte[16*1024]; int readed1; using (MemoryStream ms1 = new MemoryStream(ms.ToArray())) { while ((readed1 = (ms1.Read(buffer1, 0, buffer1.Length))) > 0) { if (readed1 < buffer1.Length) { var lastBuf = new List<Byte>(); for (int i = 0; i < readed1; i++) { lastBuf.Add(buffer1[i]); } textEncrypted += Convert.ToBase64String(lastBuf.ToArray()); continue; } textEncrypted += Convert.ToBase64String(buffer1); } } bytesEncrypted = Encoding.ASCII.GetBytes(textEncrypted); } return new MemoryStream(bytesEncrypted); }

我的RijndaelManaged

private static RijndaelManaged RijndaelManagedWithConfig(byte[] key, byte[] iv) { RijndaelManaged rjndl = new RijndaelManaged(); rjndl.KeySize = 256; rjndl.BlockSize = 128; rjndl.Key = key; rjndl.IV = iv; rjndl.Mode = CipherMode.CBC; rjndl.Padding = PaddingMode.PKCS7; return rjndl; }

请帮我摆脱错误或告诉我如何使版本1进程转换.ToBase64String数据部分。

Answer 1

我已经做出了决定

         private static Stream EncryptRijndael(byte[] key, byte[] iv, Stream plainText)
    {
        if (plainText == null)
            return null;

        byte[] buffer = new byte[5120 * 1024];

        RijndaelManaged rjndl = RijndaelManagedWithConfig(key, iv);

        using (var memoryStream = new MemoryStream())
        {
            int readedBytes;
            using (var cs = new CryptoStream(memoryStream, rjndl.CreateEncryptor(key, iv), CryptoStreamMode.Write))
            {
                while ((readedBytes = (plainText.Read(buffer, 0, buffer.Length))) > 0)
                {
                    cs.Write(buffer, 0, readedBytes);
                }
            }


            using (var cryptoMemoryStream = new MemoryStream(memoryStream.ToArray()))
            {
                using (var base64MemoryStream = new MemoryStream())
                {
                    using (ICryptoTransform transform = new ToBase64Transform())
                    {
                        using (var cryptStream = new CryptoStream(base64MemoryStream, transform, CryptoStreamMode.Write))
                        {
                            while ((readedBytes = cryptoMemoryStream.Read(buffer, 0, buffer.Length)) > 0)
                            {
                                cryptStream.Write(buffer, 0, readedBytes);
                            }
                            cryptStream.FlushFinalBlock();
                        }

                        return new MemoryStream(base64MemoryStream.ToArray());
                    }
                }
            }
        }
    }

在C＃中的块中将CryptoStream编码为Base64字符串

1 个答案: