C# 逐行加密/解密文件?
我对加密相当陌生,我正在尝试让一个逐行加密机工作;我需要能够在应用程序运行时将加密的行附加到文件中,而不是只对所有内容进行一次大规模的加密和保存。不过,我和它相处得很愉快。这是我的加密机,在我自己多次尝试失败后不知羞耻地被偷了:C# 逐行加密/解密文件?,c#,encryption,rijndaelmanaged,character-encoding,encoding,C#,Encryption,Rijndaelmanaged,Character Encoding,Encoding,我对加密相当陌生,我正在尝试让一个逐行加密机工作;我需要能够在应用程序运行时将加密的行附加到文件中,而不是只对所有内容进行一次大规模的加密和保存。不过,我和它相处得很愉快。这是我的加密机,在我自己多次尝试失败后不知羞耻地被偷了: class Encryption { private static readonly byte[] SALT = new byte[] { 0x26, 0xdc, 0xff, 0x00, 0xad, 0xed, 0x7a, 0xee, 0xc5
class Encryption
{
private static readonly byte[] SALT = new byte[] { 0x26, 0xdc, 0xff, 0x00, 0xad, 0xed, 0x7a, 0xee, 0xc5, 0xfe, 0x07, 0xaf, 0x4d, 0x08, 0x22, 0x3c };
public static byte[] Encrypt(byte[] plain, string password)
{
MemoryStream memoryStream;
CryptoStream cryptoStream;
Rijndael rijndael = Rijndael.Create();
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, SALT);
rijndael.Key = pdb.GetBytes(32);
rijndael.IV = pdb.GetBytes(16);
memoryStream = new MemoryStream();
cryptoStream = new CryptoStream(memoryStream, rijndael.CreateEncryptor(), CryptoStreamMode.Write);
cryptoStream.Write(plain, 0, plain.Length);
cryptoStream.FlushFinalBlock();
cryptoStream.Close();
return memoryStream.ToArray();
}
public static byte[] Decrypt(byte[] cipher, string password)
{
MemoryStream memoryStream;
CryptoStream cryptoStream;
Rijndael rijndael = Rijndael.Create();
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(password, SALT);
rijndael.Key = pdb.GetBytes(32);
rijndael.IV = pdb.GetBytes(16);
memoryStream = new MemoryStream();
cryptoStream = new CryptoStream(memoryStream, rijndael.CreateDecryptor(), CryptoStreamMode.Write);
cryptoStream.Write(cipher, 0, cipher.Length);
cryptoStream.FlushFinalBlock();
cryptoStream.Close();
return memoryStream.ToArray();
}
}
这是一个虚拟函数,显示了我是如何尝试的:
private void EncryptFile(string filepath, string outputPath, string password)
{
FileInfo fileInfo = new FileInfo(filepath);
string filename = fileInfo.Name;
string fullpath = outputPath + "\\" + filename;
BinaryWriter writer = new BinaryWriter(File.OpenWrite(fullpath), Encoding.ASCII);
/// Two methods that I've attempted here:
/// 1. The desired method: encrypt line by line - I assumed I'd be able to generate
/// multiple blocks of data and decrypt them later. This isn't working
//string[] lines = File.ReadAllLines(filepath);
/// 2. Just read the whole thing and encrypt and write it in one swoop.
string line = File.ReadAllText(filepath);
//foreach(string line in lines)
{
byte[] bytes = Encoding.ASCII.GetBytes(line);
byte[] encoded = Encryption.Encrypt(bytes, password);
writer.Write(encoded);
writer.Flush();
}
writer.Close();
}
private void DecryptFile(string filepath, string outputPath, string password)
{
FileInfo fileInfo = new FileInfo(filepath);
string filename = fileInfo.Name;
string fullpath = outputPath + "\\" + filename;
StreamWriter writer = new StreamWriter(fullpath, false, Encoding.UTF8);
byte[] bytes = File.ReadAllBytes(filepath);
/// Here is the method that's working at the moment for decrypting; just
/// grab all the data and decrypt it on one swoop.
byte[] decrypted = Encryption.Decrypt(bytes, password);
string s = Encoding.ASCII.GetString(decrypted);
writer.Write(s);
writer.Flush();
/// I've tried a number of things here to decrypt line by line,
/// none of which work. This crashes with an issue about the padding
/// being invalid.
/*
int index = 0;
int count = 32;
while (index
私有void加密文件(字符串文件路径、字符串输出路径、字符串密码)
{
FileInfo FileInfo=新的FileInfo(filepath);
字符串文件名=fileInfo.Name;
字符串fullpath=outputPath+“\\”+文件名;
BinaryWriter=新的BinaryWriter(File.OpenWrite(fullpath),Encoding.ASCII);
///我在这里尝试了两种方法:
///1.理想的方法:逐行加密-我假设我能够生成
///多个数据块,稍后再解密。这不起作用
//string[]lines=File.ReadAllLines(文件路径);
///2.只需通读整件事,然后一下子加密并写入即可。
字符串行=File.ReadAllText(文件路径);
//foreach(行中的字符串行)
{
byte[]bytes=Encoding.ASCII.GetBytes(行);
字节[]编码=加密。加密(字节,密码);
writer.Write(编码);
writer.Flush();
}
writer.Close();
}
私有无效解密文件(字符串文件路径、字符串输出路径、字符串密码)
{
FileInfo FileInfo=新的FileInfo(filepath);
字符串文件名=fileInfo.Name;
字符串fullpath=outputPath+“\\”+文件名;
StreamWriter writer=新的StreamWriter(完整路径,false,Encoding.UTF8);
byte[]bytes=File.ReadAllBytes(文件路径);
///这是目前正在进行解密的方法;只是
///抓取所有数据,一下子解密。
byte[]decrypted=加密。解密(字节,密码);
字符串s=Encoding.ASCII.GetString(已解密);
作者:写;
writer.Flush();
///我尝试了很多方法来逐行解密,
///这些都不起作用。这会因为填充问题而崩溃
///无效的。
/*
int指数=0;
整数计数=32;
while(索引)
我不完全确定我应该再做什么。我一直在四处闲逛,在网上浏览一些东西和例子,但它们似乎都是如何加密整个文件或只是加密一段数据,除了立即再次解密之外什么也不做。我应该如何处理逐行写入?而不是pr为您编程,我将给您一个您可以实施的方案 如果你有每行加密,我想你也希望能够对每行进行解密。请注意,“行”对于计算机来说是一个相当不方便的术语。它只是一组以某种行终止符结尾的字符。字符本身是使用特定的 此外,我将做出以下假设:
- 加密文本应以行形式显示,这意味着字节需要从二进制转换为字符(使用)
- 您希望使用单个密钥,同时保持安全
- 您不需要密码文本的完整性保护或身份验证,只需要保密
相反,请反向执行此过程,尽管IV应该在base64解码后从字节中检索,并且密钥当然应该使用加密过程中使用的相同方法进行计算。输出文件应该是什么样子?文本文件还是二进制流?您可能不想逐行读取。相反,您需要t将文件作为流抓取,然后使用加密流。对于那些对加密一无所知的人,IV是初始化向量。有时称为“nonce”或使用过一次的数字。