public override void Write(byte[] buffer, int offset, int count)
{
if (mode == CryptoMode.Decrypt)
{
throw new NotSupportedException("This stream does not Decrypt via Write()");
}
if (count == 0)
{
return;
}
byte[] plaintext = null;
if (offset != 0)
{
plaintext = new byte[count];
Buffer.BlockCopy(buffer, offset, plaintext, 0, count);
}
else
{
plaintext = buffer;
}
byte[] encrypted = encryptor.Encrypt(plaintext, count);
stream.Write(encrypted, 0, encrypted.Length);
}
public static PkwareTraditionalEncryptionData ForWrite(string password, uint crc, out byte[] encryptionHeader)
{
var encryptor = new PkwareTraditionalEncryptionData(password);
var random = new Random();
var plainTextHeader = new byte[12];
random.NextBytes(plainTextHeader);
plainTextHeader[11] = (byte)((crc >> 24) & 0xff);
encryptionHeader = encryptor.Encrypt(plainTextHeader, plainTextHeader.Length);
return(encryptor);
}
public static PkwareTraditionalEncryptionData ForWrite(string password, DateTime?modificationTime, out byte[] encryptionHeader)
{
var encryptor = new PkwareTraditionalEncryptionData(password);
var random = new Random();
var plainTextHeader = new byte[12];
random.NextBytes(plainTextHeader);
uint timeBlob = modificationTime.DateTimeToDosTime();
plainTextHeader[11] = (byte)((timeBlob >> 8) & 0xff);
encryptionHeader = encryptor.Encrypt(plainTextHeader, plainTextHeader.Length);
return(encryptor);
}
