public PdfFile(string filename)
{
Info = new FileInfo(filename);
EncryptionRecordInfo = new EncryptionRecord()
{
isEncrypted = false,
PasswordCharset = CharsetEncoding.Ascii,
encryptionType = PdfEncryptionType.None,
MaxPasswordSize = Constants.MaxPasswordSize
};
}
protected RC4DecryptorBase(EncryptionRecord encryptionInfo)
{
state = new byte[256];
userKey = new byte[32];
permission = new byte[4];
arrayMath = new ArrayMath();
md5 = new MD5CryptoServiceProvider();
mkey = new byte[encryptionInfo.keyLength / 8];
digest = new byte[encryptionInfo.keyLength / 8];
permission[0] = (byte)encryptionInfo.pValue;
permission[1] = (byte)(encryptionInfo.pValue >> 8);
permission[2] = (byte)(encryptionInfo.pValue >> 16);
permission[3] = (byte)(encryptionInfo.pValue >> 24);
}
public AESISODecryptor256Bit(EncryptionRecord encryptionInfo) : base()
{
EncryptionInfo = encryptionInfo;
sha256 = new SHA256CryptoServiceProvider();
sha384 = new SHA384CryptoServiceProvider();
sha512 = new SHA512CryptoServiceProvider();
arrayMath = new ArrayMath();
aes = new AesCryptoServiceProvider()
{
Mode = CipherMode.CBC,
Padding = PaddingMode.None,
BlockSize = 128,
KeySize = 128
};
}
public static IDecryptor Get(EncryptionRecord encryptionInfo)
{
switch (encryptionInfo.encryptionType)
{
case PdfEncryptionType.StandardEncryption40Bit:
return(new RC4Decryptor40Bit(encryptionInfo));
case PdfEncryptionType.StandardEncryption128Bit:
case PdfEncryptionType.AesEncryption128Bit:
return(new RC4Decryptor128Bit(encryptionInfo));
case PdfEncryptionType.AesEncryption256Bit:
return(new AESDecryptor256Bit(encryptionInfo));
case PdfEncryptionType.AesIsoEncryption256Bit:
return(new AESISODecryptor256Bit(encryptionInfo));
default:
throw new Exception("Unsupported encryption type.");
}
}
public PdfLoginViewModel(Window pdfLoginWindow, EncryptionRecord encryptionRecord)
{
PdfDecryptor = DecryptorFactory.Get(encryptionRecord);
pdfLoginView = pdfLoginWindow;
InitializeCommands();
}
public AESDecryptor256Bit(EncryptionRecord encryptionInfo)
{
EncryptionInfo = encryptionInfo;
sha256 = new SHA256CryptoServiceProvider();
arrayMath = new ArrayMath();
}
public static DocumentEntry CreateEncryptionEntry(DirectoryEntry dir, String path, EncryptionRecord out1)
{
String[] parts = path.Split("/".ToCharArray());
for (int i = 0; i < parts.Length - 1; i++)
{
dir = dir.HasEntry(parts[i])
? (DirectoryEntry)dir.GetEntry(parts[i])
: dir.CreateDirectory(parts[i]);
}
byte[] buf = new byte[5000];
LittleEndianByteArrayOutputStream bos = new LittleEndianByteArrayOutputStream(buf, 0);
out1.Write(bos);
String fileName = parts[parts.Length - 1];
if (dir.HasEntry(fileName))
{
dir.GetEntry(fileName).Delete();
}
return(dir.CreateDocument(fileName, bos.WriteIndex, new POIFSWriterListenerImpl(buf)));
}
public RC4Decryptor40Bit(EncryptionRecord encryptionInfo) : base(encryptionInfo)
{
EncryptionInfo = encryptionInfo;
}
