问题
Based on this code:
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
I need to get get the result (encrypted) saved to a file too. I tried to create a filestream and to CopyTo or WriteTo form the memorystream to the filestream but the output is empty:
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
{
msEncrypt.CopyTo(file);
}
}
}
}
回答1:
My comments where all wrong :-)
Now... I was forgetting that on Dispose(), the StreamWriter Dispose()s the underlying stream (the CryptoStream) in this case.
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
{
file.Write(encrypted, 0, encrypted.Length);
}
}
}
}
So my suggested revision is simply to leave the msEncrypt.ToArray() "as is" and write the byte[] encrypted as a byte[]
回答2:
Because i need to have a file (no need for the memorystream) i substitued the memorystream directly with the filestream and now i have a file containing the encrypted text:
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
//byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
//using (MemoryStream msEncrypt = new MemoryStream())
using (FileStream fileEncrypt = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
{
using (CryptoStream csEncrypt = new CryptoStream(fileEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
//encrypted = fileEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return null;
}
Edit: here the result for a Text file containing: Hello, my name is moon! Nice to meet you!
With my solution: zªžRí#°ìªPélZ_êY–eòÞiOLÍô]xÏÛùNeסÔí°"þà
With Xanatos one: +h†+vÁïˆ60œû¦&PÐvd;xäAÊ<²¾’ïõž2×-†êº,]°
Another try with mine: ¤µØ¬?ùVF‹R(ªÆä˜Éöb·¯Sƒ¸øÂiœô¶Žµ),vÒÕ¥–F3U
Another try with Xanatos tips: D*’``¢Ý4RúŽP2ÚwvŠE§ÚÅâ8íÜèq%ÉO¶}¸J‘—ôå ¼7
mmmm... they change every time i Encrypt.... i don't know before, sorry... Thanks Xanatos, your solution is good!
回答3:
Because i need to have a file (no need for the memorystream) i substitued the memorystream directly with the filestream and now i have a file containing the encrypted text:
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
//byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
//using (MemoryStream msEncrypt = new MemoryStream())
using (FileStream fileEncrypt = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
{
using (CryptoStream csEncrypt = new CryptoStream(fileEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
//encrypted = fileEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return null;
}
@Plutonix, your are right.... i decided for the solution of Xanatos which cover my question:
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an Rijndael object
// with the specified key and IV.
using (Rijndael rijAlg = Rijndael.Create())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
//csEncrypt.Flush();
//msEncrypt.Position = 0;
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
{
file.Write(encrypted, 0, encrypted.Length);
}
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
来源：https://stackoverflow.com/questions/29731462/encrypt-to-memory-stream-pass-it-to-file-stream