Hello,

would you please provide me with some simple sample of how to use the
DESCryptoServiceProvider to encrypt a buffer

byte[] buffer;

with key

byte[] key;

I saw some sample using Streams, but is there a simpler method working for
buffers?

O.

Hello Ondrej Sevecek" ondra_at_sevecek_dt_com,

you have to use CryptoStream. You could couple it with a MemoryStream to
do it all in-Memory buffer based.

if have an example here
http://www.leastprivilege.com/PermaL...f-eb06ab317075

which uses RijndaelManaged and a FileStream. Should be easy to modify

Dominick Baier - DevelopMentor
www.leastprivilege.com

Working with buffers... something like following shall do it (not sure if it
simplier :-):

SymmetricAlgorithm algorithm = DES.Create();
ICryptoTransform encryptor = algorithm.CreateEncryptor();
int blockByteSize = algorithm.BlockSize / 8;
int nBlocks = ((data.Length+blockByteSize-1)/blockByteSize);
Byte[] encryptedData = new Byte[nBlocks*blockByteSize];
for (int i = 0; i < nBlocks; i++)
{
if (i == nBlocks - 1)
{
Byte[] lastBlock = encryptor.TransformFinalBlock(data, i *
blockByteSize, nBlocks * blockByteSize - data.Length);
Array.Copy(lastBlock, 0, encryptedData, i * blockByteSize,
lastBlock.Length);
}
else
{
encryptor.TransformBlock(
data, i * blockByteSize, blockByteSize,
encryptedData, i * blockByteSize);
}
}

-Valery
http://www.harper.no/valery

"Ondrej Sevecek" <ondra_at_sevecek_dt_com> wrote