希望有人可以提供帮助。我遵循了有关如何制作加密/解密工具的非常简单的教程。加密效果很好，但是解密不起作用。加密的工作原理是，当我在文本文档中打开加密文件时，它都是随机字符，但是当我尝试对其进行解密时，原始数据将无法恢复，只是恢复了更多随机字符。
private void Btn_Encrypt_Click(object sender, EventArgs e)
{
MessageBox.Show("Your file has been encrypted", "Complete");
// a simle message box used to notify the user that the encryption process has been completed.
Encrypt(ShowPathEnc.Text, TxtSaved.Text, key);
// when the button is clicked the private void "Encrypt" is called and ran.
}
private void Encrypt(string input, string output, string strHash)
{
FileStream inStream, OutStream;
// provideds a stearm for the input(selected raw file) to be ran through the encryption algorithm and for the Output(the saved encryption file) for that file to leave
//the stearm as an encrypted file
CryptoStream CryptStream;
// CryptoStream is used to define a stream that is used to link data streams (inStrean & OutStream) to cryptographyc transformations(ASCII Encoding in this case)
TripleDESCryptoServiceProvider TripCrypto = new TripleDESCryptoServiceProvider();
//Defines a wrapper object to access the cryptographic service provider for triple data encryption
MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
//defines new object that takes a string and uses MD5 to return a 32 character hexedecimal fotrmated string hash.
byte[] byteHash, byteText;
inStream = new FileStream(input, FileMode.Open, FileAccess.Read);
// takes the raw file that has been selected by the user that is in tne dtream opens that file and reads it.
OutStream = new FileStream(output, FileMode.OpenOrCreate, FileAccess.Write);
// takes the save as file that the user has selected opens or creates it and writes the encrypted data into it
byteHash = MD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strHash));
// uses the MD5 hash to compute the data in the file and uses the ASCII key generated earlier to encrypt each byte of data in the file.
byteText = File.ReadAllBytes(input);
//reads all the bytes in the in the raw file making to have every byte encrypted.
MD5.Clear();
// the hash is then cleared for the next encryption as a completely new unique hash will be used for the next file.
TripCrypto.Key = byteHash;
// uses the key to give "TripCrypto" access to the bytes that have been computed by the hash and ASCII encoding.
TripCrypto.Mode = CipherMode.ECB;
//sets the triple layer data encryption to use the CBC standard of encryption.
CryptStream = new CryptoStream(OutStream, TripCrypto.CreateEncryptor(), CryptoStreamMode.Write);
//uses the cyrptostream to take the file in OutStrean tun it through the Triple layer dadta encryption and the the wtite mode to write the encrypted data back to the
//file in the OutStream
int bytesRead;
long length, position = 0;
//instantiates variables used to check the length of the stream in bytes and the position of each byte in the stream
length = inStream.Length;
// gets the length of the stream in bytes
while (position < length)
{
bytesRead = inStream.Read(byteText, 0, byteText.Length);
position += bytesRead;
CryptStream.Write(byteText, 0, bytesRead);
}
//the while loop is comparin g the length of each byte and position of each byte to ensure that there has been a change in position meaning data scrambling
//is used aswell as layered encryption.
inStream.Close();
OutStream.Close();
//files have exited bothe streams and therefore there is no need for those streams to be running and they're closed.
}
private void Btn_Decrypt_Click(object sender, EventArgs e)
{
MessageBox.Show("Your file has been decrypted", "Complete");
// a simle message box used to notify the user that the encryption process has been completed.
decrypt(ShowPathDec.Text, SaveDec.Text, key);
// when the button is clicked the private void "Encrypt" is called and ran.
}
private void decrypt(string input, string output, string strHash)
{
FileStream inStream, OutStream;
// provideds a stearm for the input(selected raw file) to be ran through the encryption algorithm and for the Output(the saved encryption file) for that file to leave
//the stearm as an encrypted file
CryptoStream CryptStream;
// CryptoStream is used to define a stream that is used to link data streams (inStrean & OutStream) to cryptographyc transformations(ASCII Encoding in this case)
TripleDESCryptoServiceProvider TripCrypto = new TripleDESCryptoServiceProvider();
//Defines a wrapper object to access the cryptographic service provider for triple data encryption
MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
//defines new object that takes a string and uses MD5 to return a 32 character hexedecimal fotrmated string hash.
byte[] byteHash, byteText;
inStream = new FileStream(input, FileMode.Open, FileAccess.Read);
// takes the raw file that has been selected by the user that is in tne dtream opens that file and reads it.
OutStream = new FileStream(output, FileMode.OpenOrCreate, FileAccess.Write);
// takes the save as file that the user has selected opens or creates it and writes the encrypted data into it
byteHash = MD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strHash));
// uses the MD5 hash to compute the data in the file and uses the ASCII key generated earlier to encrypt each byte of data in the file.
byteText = File.ReadAllBytes(input);
//reads all the bytes in the in the raw file making to have every byte encrypted.
MD5.Clear();
// the hash is then cleared for the next encryption as a completely new unique hash will be used for the next file.
TripCrypto.Key = byteHash;
// uses the key to give "TripCrypto" access to the bytes that have been computed by the hash and ASCII encoding.
TripCrypto.Mode = CipherMode.ECB;
//sets the triple layer data encryption to use the CBC standard of encryption.
CryptStream = new CryptoStream(OutStream, TripCrypto.CreateDecryptor(), CryptoStreamMode.Write);
//uses the cyrptostream to take the file in OutStrean tun it through the Triple layer dadta encryption and the the wtite mode to write the encrypted data back to the
//file in the OutStream
int bytesRead;
long length, position = 0;
//instantiates variables used to check the length of the stream in bytes and the position of each byte in the stream
length = inStream.Length;
// gets the length of the stream in bytes
while (position < length)
{
bytesRead = inStream.Read(byteText, 0, byteText.Length);
position += bytesRead;
CryptStream.Write(byteText, 0, bytesRead);
}
//the while loop is comparin g the length of each byte and position of each byte to ensure that there has been a change in position meaning data scrambling
//is used aswell as layered encryption.
inStream.Close();
OutStream.Close();
//files have exited bothe streams and therefore there is no need for those streams to be running and they're closed.
}
答案 0 :(得分：1)
简短的答案：在您的CryptoStreams周围放置一个using块。
您正在为加密提供者使用“电子密码簿”模式。 这意味着，除非您为该块提供足够的数据以进行加密，否则它将不会写入加密的块。
我不知道默认的默认块长，但是为了说明起见，我们假装默认为4。
Text before encryption: ABCDEFGHI [ABCD] -> Fills up the block and gets encrypted. [DEFG] -> Fills up the block and gets encrypted. [HI__] -> Doesn't fill up the code block and never gets encrypted or written to your file.
要强制CryptoStream对未完成的块进行加密，可以调用CryptoStream.Flush（）或在CryptoStream周围使用using块。