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有一種編碼輸入流的方法(版本1),並且存在成功解碼編碼數據的函數Decrypt()。但是,當輸入數據很大時,可能會出現錯誤OutOfMemory(行「string textEncrypted = Convert.ToBase64String(ms.ToArray())」)。在C#中將CryptoStream編碼爲Base64字符串#
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);
}
所以我修改以處理由部分(組塊)的陣列部分中的方法。 這是版本2。它會導致錯誤「偏移量和長度必須引用行Convert.ToBase64String(ms.ToArray(),offset,read)中的字符串」「中的位置。
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);
}
然後,我做出版本3。它的工作原理沒有錯誤,但輸出數據長度現在大於具有相同輸入數據的版本1。 Decryt()函數引發錯誤「輸入不是有效的Base-64字符串,因爲它包含非基本64字符,多於兩個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);
}
我RijndaelManaged的
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;
}
請幫我擺脫錯誤的或者告訴我如何使版本1的過程Convert.ToBase64String數據部分。
多大你的數據的決定嗎?大多數機器可以處理2Gb文件的加密。 –
不,我嘗試編碼300 Mb輸入數據 –
300Mb對於現代機器(通常具有4-16Gb的RAM)毫無用處。 –