获取Access 数据库密码

private string GetPassword(string file)
{ // 未加密的文件0x42开始至0x61之前的每间隔一字节的数值
byte[] baseByte = { 0xbe, 0xec, 0x65, 0x9c, 0xfe, 0x28, 0x2b, 0x8a, 0x6c, 0x7b, 0xcd, 0xdf, 0x4f, 0x13, 0xf7, 0xb1, };
byte flagByte = 0x0c; // 标志 0x62 处的数值
string password = "";
try
{
FileStream fs = File.OpenRead(file);
fs.Seek(0x14, SeekOrigin.Begin);
byte ver = (byte)fs.ReadByte(); // 取得版本, 1为Access2000, 0为Access97
fs.Seek(0x42, SeekOrigin.Begin);
byte[] bs = new byte[33];
if (fs.Read(bs, 0, 33) != 33) return "";
byte flag = (byte)(bs[32] ^ flagByte);
for (int i = 0; i < 16; i++)
{
byte b = (byte)(baseByte[i] ^ bs[i * 2]);
if (i % 2 == 0 && ver == 1) b ^= flag; //Access 2000
if (b > 0) password += (char)b;
}
}
catch { }
return password;
}

private void button4_Click(object sender, EventArgs e)
{
OpenFileDialog myOpenFileDialog = new OpenFileDialog();
myOpenFileDialog.InitialDirectory = "c:\\";
myOpenFileDialog.Filter = "Access文件|*.mdb|所有文件|*.*";

if (myOpenFileDialog.ShowDialog() == DialogResult.OK)
{
this.textBox5.Text = this.GetPassword(myOpenFileDialog.FileName);
}
}