public class strorfilepass {
/// <summary>
/// 初始化安全类
/// </summary>
public strorfilepass()
{
///默认密码
key = "www.qhjsw.net";
}
private string key; //默认密钥
private byte[] sKey;
private byte[] sIV;
#region 加密字符串
/// <summary>
/// 加密字符串
/// </summary>
/// <param name="inputStr">输入字符串</param>
/// <param name="keyStr">密码，可以为""</param>
/// <returns>输出加密后字符串</returns>
public string EncryptString(string inputStr,string keyStr)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
if (keyStr == "")
keyStr = key;
byte[] inputByteArray = Encoding.Default.GetBytes(inputStr);
byte[] keyByteArray = Encoding.Default.GetBytes(keyStr);
SHA1 ha = new SHA1Managed();
byte[] hb = ha.ComputeHash(keyByteArray);
sKey = new byte[8];
sIV = new byte[8];
for (int i = 0; i < 8; i++)
sKey[i] = hb[i];
for (int i = 8; i < 16; i++)
sIV[i - 8] = hb[i];
des.Key = sKey;
des.IV = sIV;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write);
cs.Write(inputByteArray,inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}",b);
}
cs.Close();
ms.Close();
return ret.ToString();
}
/// <summary>
/// 解密字符串
/// </summary>
/// <param name="inputStr">要解密的字符串</param>
/// <param name="keyStr">密钥</param>
/// <returns>解密后的结果</returns>
public string DecryptString(string inputStr,string keyStr)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
if (keyStr == "")
keyStr = key;
byte[] inputByteArray = new byte[inputStr.Length / 2];
for (int x = 0; x < inputStr.Length / 2; x++)
{
int i = (Convert.ToInt32(inputStr.Substring(x * 2,2),16));
inputByteArray[x] = (byte)i;
}
byte[] keyByteArray = Encoding.Default.GetBytes(keyStr);
SHA1 ha = new SHA1Managed();
byte[] hb = ha.ComputeHash(keyByteArray);
sKey = new byte[8];
sIV = new byte[8];
for (int i = 0; i < 8; i++)
sKey[i] = hb[i];
for (int i = 8; i < 16; i++)
sIV[i - 8] = hb[i];
des.Key = sKey;
des.IV = sIV;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,des.CreateDecryptor(),inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
#endregion
#region 加密文件
/// <summary>
/// 加密文件
/// </summary>
/// <param name="filePath">输入文件路径</param>
/// <param name="savePath">加密后输出文件路径</param>
/// <param name="keyStr">密码，可以为""</param>
/// <returns></returns>
public bool EncryptFile(string filePath,string savePath,string keyStr)
{
try
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
if (keyStr == "")
keyStr = key;
FileStream fs = File.OpenRead(filePath);
byte[] inputByteArray = new byte[fs.Length];
fs.Read(inputByteArray,(int)fs.Length);
fs.Close();
byte[] keyByteArray = Encoding.Default.GetBytes(keyStr);
SHA1 ha = new SHA1Managed();
byte[] hb = ha.ComputeHash(keyByteArray);
sKey = new byte[8];
sIV = new byte[8];
for (int i = 0; i < 8; i++)
sKey[i] = hb[i];
for (int i = 8; i < 16; i++)
sIV[i - 8] = hb[i];
des.Key = sKey;
des.IV = sIV;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms,CryptoStreamMode.Write);
cs.Write(inputByteArray,inputByteArray.Length);
cs.FlushFinalBlock();
fs = File.OpenWrite(savePath);
foreach (byte b in ms.ToArray())
{
fs.WriteByte(b);
}
fs.Close();
cs.Close();
ms.Close();
return true;
}
catch{
return false;
}
}
#endregion
#region 解密文件
/// <summary>
/// 解密文件
/// </summary>
/// <param name="filePath">输入文件路径</param>
/// <param name="savePath">解密后输出文件路径</param>
/// <param name="keyStr">密码，可以为""</param>
/// <returns></returns>
public bool DecryptFile(string filePath,inputByteArray.Length);
cs.FlushFinalBlock();
fs = File.OpenWrite(savePath);
foreach (byte b in ms.ToArray())
{
fs.WriteByte(b);
}
fs.Close();
cs.Close();
ms.Close();
return true;
}
catch {
return false;
}
}
#endregion
# region 大文件加密
/// <summary>
/// 加密文件
/// </summary>
/// <param name="filePath">输入文件路径</param>
/// <param name="savePath">加密后输出文件路径</param>
/// <param name="keyStr">密码，可以为""</param>
/// <returns></returns>
public bool BEncryptFile(string filePath,string keyStr)
{
try
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
if (keyStr == "")
keyStr = key;
FileStream fs = File.OpenRead(filePath);
byte[] inputByteArray = new byte[500];
long Myfilesize = fs.Length;
int Mycompletedsize = 0;
byte[] keyByteArray = Encoding.Default.GetBytes(keyStr);
SHA1 ha = new SHA1Managed();
byte[] hb = ha.ComputeHash(keyByteArray);
sKey = new byte[8];
sIV = new byte[8];
for (int i = 0; i < 8; i++)
sKey[i] = hb[i];
for (int i = 8; i < 16; i++)
sIV[i - 8] = hb[i];
des.Key = sKey;
des.IV = sIV;
FileStream ms = File.OpenWrite(savePath);
CryptoStream cs = new CryptoStream(ms,CryptoStreamMode.Write);
while (Mycompletedsize < Myfilesize)
{
int length = fs.Read(inputByteArray,500);
cs.Write(inputByteArray,length);
Mycompletedsize += length;
}
cs.FlushFinalBlock();
fs.Close();
fs.dispose();
cs.Close();
cs.dispose();
ms.Close();
ms.dispose();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 解密文件
/// </summary>
/// <param name="filePath">输入文件路径</param>
/// <param name="savePath">解密后输出文件路径</param>
/// <param name="keyStr">密码，可以为""</param>
/// <returns></returns>
public bool BDecryptFile(string filePath,length);
Mycompletedsize += length;
}
cs.FlushFinalBlock();
fs.Close();
fs.dispose();
cs.Close();
cs.dispose();
ms.Close();
ms.dispose();
return true;
}
catch
{
return false;
}
}
#endregion
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