前些时间看了一下加密的,接着就写了一个文件加密:
先定义一个加密异常类
/// <summary>
/// 加密异常类
/// </summary>
public class CryptoFileException : ApplicationException
{
/// <summary>
/// 加密异常构造函数
/// </summary>
/// <param name="msg">异常信息</param>
public CryptoFileException(string msg) : base(msg) { }
}
下面是实现/// 加密异常类
/// </summary>
public class CryptoFileException : ApplicationException
{
/// <summary>
/// 加密异常构造函数
/// </summary>
/// <param name="msg">异常信息</param>
public CryptoFileException(string msg) : base(msg) { }
}
/// <summary>
/// 文件加密
/// </summary>
public class CrypToFile
{
private string password="Grouppower";
private const ulong FC_TAG = 0xFC010203040506CF;
private const int BUFFER_SIZE = 128 * 1024;
private RandomNumberGenerator rand = new RNGCryptoServiceProvider();//加密文件随机数生成
/// <summary>
/// 文件加密构造
/// </summary>
/// <param name="password">用于文件加密的密钥</param>
public CrypToFile(string password)
{
this.password = password;
}
/// <summary>
/// 文件加密默认构造
/// </summary>
public CrypToFile() { }
/// <summary>
/// 返加加密密钥
/// </summary>
public string Password
{
get
{
string result = "";
if (password == null || password == "Grouppower")
{
result = "";
}
else
{
result = password;
}
return result;
}
set
{
if (value == null || value == "")
{
value = "Grouppower";
}
password = value;
}
}
/// <summary>
/// 检验两个Byte数组是否相同
/// </summary>
/// <param name="b1">字节数组一</param>
/// <param name="b2">字节数组二</param>
/// <returns>结果是否相等</returns>
private bool CheckByteArrays(byte[] b1, byte[] b2)
{
if (b1.Length == b2.Length)
{
for (int i = 0; i < b1.Length; ++i)
{
if (b1[i] != b2[i])
return false;
}
return true;
}
return false;
}
/// <summary>
/// 创建Rijndael SymmetricAlgorithm
/// </summary>
/// <param name="password">密码</param>
/// <param name="salt">密钥的字节数组</param>
/// <returns>加密对象</returns>
private SymmetricAlgorithm CreateRijndael(string password, byte[] salt)
{
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, "SHA256", 1000);
SymmetricAlgorithm sma = Rijndael.Create();
sma.KeySize = 256;
sma.Key = pdb.GetBytes(32);
sma.Padding = PaddingMode.PKCS7;
return sma;
}
/// <summary>
/// 生成指定长度的随机Byte数组
/// </summary>
/// <param name="count">长度</param>
/// <returns>随机Byte数组</returns>
private byte[] GenerateRandomBytes(int count)
{
byte[] bytes = new byte[count];
rand.GetBytes(bytes);
return bytes;
}
/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">原始文件</param>
/// <param name="outFile">密码文件</param>
/// <param name="password">密码</param>
private void EncryptFile(string inFile, string outFile, string password)
{
string fileName = Path.GetFileName(inFile);
string pFileName = Path.GetFileNameWithoutExtension(inFile);
if (outFile.EndsWith("\\"))
{
outFile = string.Format("{0}{1}.pgd", outFile, pFileName);
}
else
{
outFile = string.Format("{0}\\{1}.pgd", outFile, pFileName);
}
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
long lSize = fin.Length; // 输入文件长度
int size = (int)lSize;
byte[] bytes = new byte[BUFFER_SIZE]; // 缓存
int read = -1; // 输入文件读取数量
int value = 0;
// 获取IV和salt
byte[] IV = GenerateRandomBytes(16);
byte[] salt = GenerateRandomBytes(16);
// 创建加密对象
SymmetricAlgorithm sma = CreateRijndael(password, salt);
sma.IV = IV;
// 在输出文件开始部分写入IV和salt
fout.Write(IV, 0, IV.Length);
fout.Write(salt, 0, salt.Length);
// 创建散列加密
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
BinaryWriter bw = new BinaryWriter(cout);
bw.Write(lSize);
bw.Write(FC_TAG);
// 读写字节块到加密流缓冲区
while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)
{
cout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
}
// 关闭加密流
chash.Flush();
chash.Close();
// 读取散列
byte[] hash = hasher.Hash;
// 输入文件写入散列
cout.Write(hash, 0, hash.Length);
bytes = Encoding.Default.GetBytes(fileName);
cout.Write(bytes,0,bytes.Length);
// 关闭文件流
cout.Flush();
cout.Close();
}
}
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="inFile">密码文件</param>
/// <param name="outFile">原始文件</param>
/// <param name="password">密码</param>
private void DecryptFile(string inFile, string outFile, string password)
{
string tarDir = outFile;
string fileName=Path.GetFileNameWithoutExtension(inFile);
// 创建打开文件流
if (outFile.EndsWith("\\"))
{
outFile = string.Format("{0}{1}", outFile,fileName);
}
else
{
tarDir+="\\";
outFile = string.Format("{0}\\{1}", outFile,fileName);
}
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
int size = (int)fin.Length;
byte[] bytes = new byte[BUFFER_SIZE];
int read = -1;
int value = 0;
int outValue = 0;
byte[] IV = new byte[16];
fin.Read(IV, 0, 16);
byte[] salt = new byte[16];
fin.Read(salt, 0, 16);
SymmetricAlgorithm sma = CreateRijndael(password, salt);
sma.IV = IV;
value = 32;
long lSize = -1;
// 创建散列对象, 校验文件
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
// 读取文件长度
BinaryReader br = new BinaryReader(cin);
lSize = br.ReadInt64();
ulong tag = br.ReadUInt64();
if (FC_TAG != tag)
throw new CryptoFileException("文件被破坏");
long numReads = lSize / BUFFER_SIZE;
long slack = (long)lSize % BUFFER_SIZE;
for (int i = 0; i < numReads; ++i)
{
read = cin.Read(bytes, 0, bytes.Length);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
if (slack > 0)
{
read = cin.Read(bytes, 0, (int)slack);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
chash.Flush();
chash.Close();
fout.Flush();
fout.Close();
byte[] curHash = hasher.Hash;
// 获取比较和旧的散列对象
byte[] oldHash = new byte[hasher.HashSize / 8];
read = cin.Read(oldHash, 0, oldHash.Length);
if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))
throw new CryptoFileException("文件被破坏");
if (outValue != lSize)
throw new CryptoFileException("文件大小不匹配");
try
{
byte[] fileBytes = new byte[256];
StringBuilder resultBuilder = new StringBuilder();
while ((read = cin.Read(fileBytes, 0, fileBytes.Length)) > 0)
{
resultBuilder.Append(Encoding.Default.GetString(fileBytes, 0, fileBytes.Length));
}
fileName = resultBuilder.ToString();
if (fileName != null && fileName != "")
{
string tarFileName = string.Format("{0}{1}", tarDir, fileName).Trim(new char[] { '\0' });
File.Move(outFile, tarFileName);
}
}
catch
{
throw new CryptoFileException("密钥不正确");
}
}
}
}
/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">待加密的文件</param>
/// <param name="outFile">加密后的文件</param>
public void EncryFile(string inFile,string outFile)
{
if (File.Exists(inFile) && Directory.Exists(outFile))
{
EncryptFile(inFile, outFile, password);
}
else
{
throw new FileNotFoundException("文件或文件夹不存在");
}
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="inFile">待解密的文件</param>
/// <param name="outFile">解密后的文件</param>
public void DecryFile(string inFile, string outFile)
{
if (File.Exists(inFile) && Directory.Exists(outFile))
{
DecryptFile(inFile, outFile, password);
}
else
{
throw new FileNotFoundException("文件或文件夹不存在");
}
}
}
/// 文件加密
/// </summary>
public class CrypToFile
{
private string password="Grouppower";
private const ulong FC_TAG = 0xFC010203040506CF;
private const int BUFFER_SIZE = 128 * 1024;
private RandomNumberGenerator rand = new RNGCryptoServiceProvider();//加密文件随机数生成
/// <summary>
/// 文件加密构造
/// </summary>
/// <param name="password">用于文件加密的密钥</param>
public CrypToFile(string password)
{
this.password = password;
}
/// <summary>
/// 文件加密默认构造
/// </summary>
public CrypToFile() { }
/// <summary>
/// 返加加密密钥
/// </summary>
public string Password
{
get
{
string result = "";
if (password == null || password == "Grouppower")
{
result = "";
}
else
{
result = password;
}
return result;
}
set
{
if (value == null || value == "")
{
value = "Grouppower";
}
password = value;
}
}
/// <summary>
/// 检验两个Byte数组是否相同
/// </summary>
/// <param name="b1">字节数组一</param>
/// <param name="b2">字节数组二</param>
/// <returns>结果是否相等</returns>
private bool CheckByteArrays(byte[] b1, byte[] b2)
{
if (b1.Length == b2.Length)
{
for (int i = 0; i < b1.Length; ++i)
{
if (b1[i] != b2[i])
return false;
}
return true;
}
return false;
}
/// <summary>
/// 创建Rijndael SymmetricAlgorithm
/// </summary>
/// <param name="password">密码</param>
/// <param name="salt">密钥的字节数组</param>
/// <returns>加密对象</returns>
private SymmetricAlgorithm CreateRijndael(string password, byte[] salt)
{
PasswordDeriveBytes pdb = new PasswordDeriveBytes(password, salt, "SHA256", 1000);
SymmetricAlgorithm sma = Rijndael.Create();
sma.KeySize = 256;
sma.Key = pdb.GetBytes(32);
sma.Padding = PaddingMode.PKCS7;
return sma;
}
/// <summary>
/// 生成指定长度的随机Byte数组
/// </summary>
/// <param name="count">长度</param>
/// <returns>随机Byte数组</returns>
private byte[] GenerateRandomBytes(int count)
{
byte[] bytes = new byte[count];
rand.GetBytes(bytes);
return bytes;
}
/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">原始文件</param>
/// <param name="outFile">密码文件</param>
/// <param name="password">密码</param>
private void EncryptFile(string inFile, string outFile, string password)
{
string fileName = Path.GetFileName(inFile);
string pFileName = Path.GetFileNameWithoutExtension(inFile);
if (outFile.EndsWith("\\"))
{
outFile = string.Format("{0}{1}.pgd", outFile, pFileName);
}
else
{
outFile = string.Format("{0}\\{1}.pgd", outFile, pFileName);
}
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
long lSize = fin.Length; // 输入文件长度
int size = (int)lSize;
byte[] bytes = new byte[BUFFER_SIZE]; // 缓存
int read = -1; // 输入文件读取数量
int value = 0;
// 获取IV和salt
byte[] IV = GenerateRandomBytes(16);
byte[] salt = GenerateRandomBytes(16);
// 创建加密对象
SymmetricAlgorithm sma = CreateRijndael(password, salt);
sma.IV = IV;
// 在输出文件开始部分写入IV和salt
fout.Write(IV, 0, IV.Length);
fout.Write(salt, 0, salt.Length);
// 创建散列加密
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cout = new CryptoStream(fout, sma.CreateEncryptor(), CryptoStreamMode.Write),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
BinaryWriter bw = new BinaryWriter(cout);
bw.Write(lSize);
bw.Write(FC_TAG);
// 读写字节块到加密流缓冲区
while ((read = fin.Read(bytes, 0, bytes.Length)) != 0)
{
cout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
}
// 关闭加密流
chash.Flush();
chash.Close();
// 读取散列
byte[] hash = hasher.Hash;
// 输入文件写入散列
cout.Write(hash, 0, hash.Length);
bytes = Encoding.Default.GetBytes(fileName);
cout.Write(bytes,0,bytes.Length);
// 关闭文件流
cout.Flush();
cout.Close();
}
}
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="inFile">密码文件</param>
/// <param name="outFile">原始文件</param>
/// <param name="password">密码</param>
private void DecryptFile(string inFile, string outFile, string password)
{
string tarDir = outFile;
string fileName=Path.GetFileNameWithoutExtension(inFile);
// 创建打开文件流
if (outFile.EndsWith("\\"))
{
outFile = string.Format("{0}{1}", outFile,fileName);
}
else
{
tarDir+="\\";
outFile = string.Format("{0}\\{1}", outFile,fileName);
}
using (FileStream fin = File.OpenRead(inFile),
fout = File.OpenWrite(outFile))
{
int size = (int)fin.Length;
byte[] bytes = new byte[BUFFER_SIZE];
int read = -1;
int value = 0;
int outValue = 0;
byte[] IV = new byte[16];
fin.Read(IV, 0, 16);
byte[] salt = new byte[16];
fin.Read(salt, 0, 16);
SymmetricAlgorithm sma = CreateRijndael(password, salt);
sma.IV = IV;
value = 32;
long lSize = -1;
// 创建散列对象, 校验文件
HashAlgorithm hasher = SHA256.Create();
using (CryptoStream cin = new CryptoStream(fin, sma.CreateDecryptor(), CryptoStreamMode.Read),
chash = new CryptoStream(Stream.Null, hasher, CryptoStreamMode.Write))
{
// 读取文件长度
BinaryReader br = new BinaryReader(cin);
lSize = br.ReadInt64();
ulong tag = br.ReadUInt64();
if (FC_TAG != tag)
throw new CryptoFileException("文件被破坏");
long numReads = lSize / BUFFER_SIZE;
long slack = (long)lSize % BUFFER_SIZE;
for (int i = 0; i < numReads; ++i)
{
read = cin.Read(bytes, 0, bytes.Length);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
if (slack > 0)
{
read = cin.Read(bytes, 0, (int)slack);
fout.Write(bytes, 0, read);
chash.Write(bytes, 0, read);
value += read;
outValue += read;
}
chash.Flush();
chash.Close();
fout.Flush();
fout.Close();
byte[] curHash = hasher.Hash;
// 获取比较和旧的散列对象
byte[] oldHash = new byte[hasher.HashSize / 8];
read = cin.Read(oldHash, 0, oldHash.Length);
if ((oldHash.Length != read) || (!CheckByteArrays(oldHash, curHash)))
throw new CryptoFileException("文件被破坏");
if (outValue != lSize)
throw new CryptoFileException("文件大小不匹配");
try
{
byte[] fileBytes = new byte[256];
StringBuilder resultBuilder = new StringBuilder();
while ((read = cin.Read(fileBytes, 0, fileBytes.Length)) > 0)
{
resultBuilder.Append(Encoding.Default.GetString(fileBytes, 0, fileBytes.Length));
}
fileName = resultBuilder.ToString();
if (fileName != null && fileName != "")
{
string tarFileName = string.Format("{0}{1}", tarDir, fileName).Trim(new char[] { '\0' });
File.Move(outFile, tarFileName);
}
}
catch
{
throw new CryptoFileException("密钥不正确");
}
}
}
}
/// <summary>
/// 加密文件
/// </summary>
/// <param name="inFile">待加密的文件</param>
/// <param name="outFile">加密后的文件</param>
public void EncryFile(string inFile,string outFile)
{
if (File.Exists(inFile) && Directory.Exists(outFile))
{
EncryptFile(inFile, outFile, password);
}
else
{
throw new FileNotFoundException("文件或文件夹不存在");
}
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="inFile">待解密的文件</param>
/// <param name="outFile">解密后的文件</param>
public void DecryFile(string inFile, string outFile)
{
if (File.Exists(inFile) && Directory.Exists(outFile))
{
DecryptFile(inFile, outFile, password);
}
else
{
throw new FileNotFoundException("文件或文件夹不存在");
}
}
}