private void save_encrypted(string szFileName)
{
EncrDecr ed;
System.IO.FileStream fs = new System.IO.FileStream(szFileName, System.IO.FileMode.Create);
System.IO.BinaryWriter sw = new System.IO.BinaryWriter(fs, System.Text.Encoding.UTF8);
sw.Write(PASSWORD_PROTECTED);
int i, l;
string tmp;
for (i = unlockPassword.Length; i < EncrDecr.C_KEYSIZE; i++)
{
sw.Write(crypt_key[i]);
}
//sw.Write(crypt_key);
sw.Write(crypt_iv);
ed = new EncrDecr();
sw.Write(ed.Encrypt(C_VERIFYTEXT, crypt_key, crypt_iv));
tmp = xmlDoc.OuterXml;
l = tmp.Length;
for (i = 0; i < l; i += C_BLOCKSIZE)
{
if (i + C_BLOCKSIZE <= l)
{
ed = new EncrDecr();
sw.Write(ed.Encrypt(tmp.Substring(i, C_BLOCKSIZE), crypt_key, crypt_iv));
}
else
{
ed = new EncrDecr();
sw.Write(ed.Encrypt(tmp.Substring(i), crypt_key, crypt_iv));
}
}
sw.Close();
fs.Close();
}
public bool TryPassword(string password)
{
bool bRet = false;
unlockPassword = password;
string tmp;
EncrDecr ed;
ed = new EncrDecr();
crypt_key = new byte[EncrDecr.C_KEYSIZE];
crypt_iv = new byte[EncrDecr.C_IVSIZE];
System.IO.FileStream fs = new System.IO.FileStream(FileName, System.IO.FileMode.Open);
System.IO.BinaryReader br = new System.IO.BinaryReader(fs, System.Text.Encoding.UTF8);
// read 'PASSWORD-'
tmp = br.ReadString();
// set password
int i;
for (i = 0; i < unlockPassword.Length && i < EncrDecr.C_KEYSIZE; i++)
{
crypt_key[i] = (byte)(unlockPassword[i] & 0xFF);
}
byte[] data = new Byte[fs.Length - (tmp.Length + 1) - (EncrDecr.C_KEYSIZE - i) - EncrDecr.C_IVSIZE];
// read crypt-key
for (; i < EncrDecr.C_KEYSIZE; i++)
{
crypt_key[i] = br.ReadByte();
}
// read crypt-iv
br.Read(crypt_iv, 0, EncrDecr.C_IVSIZE);
// read VerifyText
byte[] data_test = new Byte[C_VERIFYTEXT.Length * 2 + 16];
br.Read(data_test, 0, C_VERIFYTEXT.Length * 2 + 16);
if (ed.Decrypt(data_test, crypt_key, crypt_iv).CompareTo(C_VERIFYTEXT) != 0)
{
unlockPassword = "";
bRet = false;
}
else
{
byte[] data_frag = new Byte[C_BLOCKSIZE * 2 + 16];
int realsize;
System.Text.StringBuilder xml = new System.Text.StringBuilder(10000);
while ((realsize = br.Read(data_frag, 0, C_BLOCKSIZE * 2 + 16)) > 0)
{
int olds = xml.Length;
ed = new EncrDecr();
string element = ed.Decrypt(data_frag, crypt_key, crypt_iv);
xml.Append(element, 0, element.Length);
}
xmlDoc.LoadXml(xml.ToString());
this.szFullfile = null;
bRet = true;
}
checkXMLValidity();
br.Close();
fs.Close();
return(bRet);
}
