encryption of a dataset

[Mike Peretz]

I am trying to encrypt and decrypts a dataset using ds.WriteXml and
ds.ReadXml. I am able to encrypt the dataset but I can never read the data
back...I get an exception of Bad Data

for example, for writing there seems to be no problem...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Create,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{
using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_encryptor, CryptoStreamMode.Write))
{
m_dsRegistration.WriteXml(cryptStream, XmlWriteMode.WriteSchema);
}
}

for reading...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Open,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{

using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_decryptor, CryptoStreamMode.Read))
{
// load the data with the schema. After this line we should have all
our
// registration information.

m_dsRegistration.ReadXml(cryptStream, XmlReadMode.ReadSchema);

}
}
}

However... cryptStream.Read(...) works does not cause an exception.

Any ideas?

[Michael Giagnocavo [MVP]]

Ivan Medvedev has a nice example of using CryptoStreams:
http://blogs.gotdotnet.com/ivanmed/

http://blogs.gotdotnet.com/ivanmed/P...6-5973106935a4

You could try building up from there to see where the problem lies.

-mike
MVP

"Mike Peretz" <m_******@sympatico.ca> wrote in message
news:iI********************@news20.bellglobal.com. ..

I am trying to encrypt and decrypts a dataset using ds.WriteXml and
ds.ReadXml. I am able to encrypt the dataset but I can never read the data
back...I get an exception of Bad Data

for example, for writing there seems to be no problem...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Create,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{
using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_encryptor, CryptoStreamMode.Write))
{
m_dsRegistration.WriteXml(cryptStream, XmlWriteMode.WriteSchema);
}
}

for reading...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Open,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{

using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_decryptor, CryptoStreamMode.Read))
{
// load the data with the schema. After this line we should have all
our
// registration information.

m_dsRegistration.ReadXml(cryptStream, XmlReadMode.ReadSchema);

}
}
}

However... cryptStream.Read(...) works does not cause an exception.

Any ideas?

[Mike Peretz]

Thanks.
"Michael Giagnocavo [MVP]" <mg*******@Atrevido.net> wrote in message
news:O4**************@TK2MSFTNGP10.phx.gbl...

Ivan Medvedev has a nice example of using CryptoStreams:
http://blogs.gotdotnet.com/ivanmed/

http://blogs.gotdotnet.com/ivanmed/P...5-40b9-ace6-59
73106935a4
You could try building up from there to see where the problem lies.

-mike
MVP

"Mike Peretz" <m_******@sympatico.ca> wrote in message
news:iI********************@news20.bellglobal.com. ..

I am trying to encrypt and decrypts a dataset using ds.WriteXml and
ds.ReadXml. I am able to encrypt the dataset but I can never read the data back...I get an exception of Bad Data

for example, for writing there seems to be no problem...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Create,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{
using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_encryptor, CryptoStreamMode.Write))
{
m_dsRegistration.WriteXml(cryptStream, XmlWriteMode.WriteSchema);
}
}

for reading...

using (IsolatedStorageFileStream storeStream = new
IsolatedStorageFileStream("reg.xml",
FileMode.Open,
FileAccess.ReadWrite,
FileShare.Read,
m_storeFile))
{

using (CryptoStream cryptStream = new CryptoStream(storeStream,
m_decryptor, CryptoStreamMode.Read))
{
// load the data with the schema. After this line we should have all our
// registration information.

m_dsRegistration.ReadXml(cryptStream, XmlReadMode.ReadSchema);

}
}
}

However... cryptStream.Read(...) works does not cause an exception.

Any ideas?