C# 将CryptoStream编码为C中的块中的Base64字符串#
有一个方法(Version1)对输入流进行编码,还有一个函数Decrypt()成功解码编码数据。但当输入数据较大时,可能会出现错误OutOfMemory(在“string textEncrypted=Convert.ToBase64String(ms.ToArray())”行上) 版本1C# 将CryptoStream编码为C中的块中的Base64字符串#,c#,asp.net,base64,chunks,cryptostream,C#,Asp.net,Base64,Chunks,Cryptostream,有一个方法(Version1)对输入流进行编码,还有一个函数Decrypt()成功解码编码数据。但当输入数据较大时,可能会出现错误OutOfMemory(在“string textEncrypted=Convert.ToBase64String(ms.ToArray())”行上) 版本1 private static Stream EncryptRijndael1(byte[] key, byte[] iv, Stream plainText) { if (pla
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);
}
因此,我修改了该方法以逐部分(块)处理数组。
这里是第2版。它会导致错误“偏移量和长度必须参考Convert.ToBase64String(ms.ToArray(),offset,read)行中字符串“中的位置。”
Version2
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);
}
然后我制作了第三版。它可以正常工作,但现在的输出数据长度大于具有相同输入数据的Version1。
函数的Decryt()抛出一个错误“输入不是有效的Base-64字符串,因为它包含一个非Base-64字符、两个以上的填充字符或填充字符中的非法字符。”
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);
}
请帮助我消除错误,或告诉我如何使Version1进程转换。TOBASE64字符串数据部分我已做出决定
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());
}
}
}
}
}
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());
}
}
}
}
}
您的数据有多大?大多数机器都能处理2Gb文件的加密。不,我试着对300 Mb的输入数据进行编码。300 Mb对于现代机器来说是微不足道的(通常有4-16Gb的RAM)。我知道。。。我想优化转换为Base64String,但我的修改版本1中没有一个不能正常工作。您的数据有多大?大多数机器都能处理2Gb文件的加密。不,我试着对300 Mb的输入数据进行编码。300 Mb对于现代机器来说是微不足道的(通常有4-16Gb的RAM)。我知道。。。我想优化转换为Base64String,但我的修改版本1中没有一个不能正常工作。