Can anyone tell me whats wrong with this code?

[Tony]

I found similar code for encoding/decoding strings in VB which works fine.
However I wanted to use it in a C# projected and can't get it to work.
When it executes the TransformFinalB lock() call at the end it always returns
the error

"System.Securit y.Cryptography. CryptographicEx ception: Length of the data to
decrypt is invalid."

Can anyone see what I am doing wrong - I have tried playing with the lengths
and the construction of the byte array without any luck:

public string EncryptTripleDE S(string sIn, string sKey )
{
// takes a string and encodes it
TripleDESCrypto ServiceProvider DES = new TripleDESCrypto ServiceProvider ();
MD5CryptoServic eProvider hashMD5 = new MD5CryptoServic eProvider();

// Compute the MD5 hash.
DES.Key = hashMD5.Compute Hash(System.Tex t.ASCIIEncoding .ASCII.GetBytes (sKey));

// Set the cipher mode.
DES.Mode = CipherMode.ECB;

// Create the encryptor.
ICryptoTransfor m DESEncrypt = DES.CreateDecry ptor();

// Tried with out any luck!
// int byteCount = System.Text.ASC IIEncoding.ASCI I.GetByteCount( sIn);
// Byte[] Buffer = new Byte[byteCount];

byte[] Buffer = System.Text.ASC IIEncoding.ASCI I.GetBytes(sIn) ;

// Transform and return the string.
return Convert.ToBase6 4String(DESEncr ypt.TransformFi nalBlock(Buffer , 0,
Buffer.Length)) ;
}

Its this very last line that fails - I have tried Length-1 but that doesnt
work, I've also tried creatinf the byte array first, with same result
TIA
Tony

[Scott Allen]

Hi Tony:

I think this is simple - the giveaway is the error message that says
it has a problem DECRYPTING data in your encryption function.

Change

DES.CreateDecry ptor();

to

DES.CreateEncry ptor();

and you should be fine. Looks like a copy and paste error :)

--
Scott
http://www.OdeToCode.com

On Sun, 12 Sep 2004 17:51:03 -0700, "Tony"
<To**@discussio ns.microsoft.co m> wrote:

I found similar code for encoding/decoding strings in VB which works fine.
However I wanted to use it in a C# projected and can't get it to work.
When it executes the TransformFinalB lock() call at the end it always returns
the error

"System.Securi ty.Cryptography .CryptographicE xception: Length of the data to
decrypt is invalid."

Can anyone see what I am doing wrong - I have tried playing with the lengths
and the construction of the byte array without any luck:

public string EncryptTripleDE S(string sIn, string sKey )
{
// takes a string and encodes it
TripleDESCrypt oServiceProvide r DES = new TripleDESCrypto ServiceProvider ();
MD5CryptoServi ceProvider hashMD5 = new MD5CryptoServic eProvider();

// Compute the MD5 hash.
DES.Key = hashMD5.Compute Hash(System.Tex t.ASCIIEncoding .ASCII.GetBytes (sKey));

// Set the cipher mode.
DES.Mode = CipherMode.ECB;

// Create the encryptor.
ICryptoTransfo rm DESEncrypt = DES.CreateDecry ptor();

// Tried with out any luck!
// int byteCount = System.Text.ASC IIEncoding.ASCI I.GetByteCount( sIn);
// Byte[] Buffer = new Byte[byteCount];

byte[] Buffer = System.Text.ASC IIEncoding.ASCI I.GetBytes(sIn) ;

// Transform and return the string.
return Convert.ToBase6 4String(DESEncr ypt.TransformFi nalBlock(Buffer , 0,
Buffer.Length) );
}

Its this very last line that fails - I have tried Length-1 but that doesnt
work, I've also tried creatinf the byte array first, with same result
TIA
Tony

[Tony]

Hi Scott

A huge thank you for spotting this - you wont believe the hours I spent
scratching my head looking at the length of the Buffer

Thanks
Tony :-)

"Scott Allen" wrote:

Hi Tony:

I think this is simple - the giveaway is the error message that says
it has a problem DECRYPTING data in your encryption function.

Change

DES.CreateDecry ptor();

to

DES.CreateEncry ptor();

and you should be fine. Looks like a copy and paste error :)

--
Scott
http://www.OdeToCode.com

On Sun, 12 Sep 2004 17:51:03 -0700, "Tony"
<To**@discussio ns.microsoft.co m> wrote:

I found similar code for encoding/decoding strings in VB which works fine.
However I wanted to use it in a C# projected and can't get it to work.
When it executes the TransformFinalB lock() call at the end it always returns
the error

"System.Securi ty.Cryptography .CryptographicE xception: Length of the data to
decrypt is invalid."

Can anyone see what I am doing wrong - I have tried playing with the lengths
and the construction of the byte array without any luck:

public string EncryptTripleDE S(string sIn, string sKey )
{
// takes a string and encodes it
TripleDESCrypt oServiceProvide r DES = new TripleDESCrypto ServiceProvider ();
MD5CryptoServi ceProvider hashMD5 = new MD5CryptoServic eProvider();

// Compute the MD5 hash.
DES.Key = hashMD5.Compute Hash(System.Tex t.ASCIIEncoding .ASCII.GetBytes (sKey));

// Set the cipher mode.
DES.Mode = CipherMode.ECB;

// Create the encryptor.
ICryptoTransfo rm DESEncrypt = DES.CreateDecry ptor();

// Tried with out any luck!
// int byteCount = System.Text.ASC IIEncoding.ASCI I.GetByteCount( sIn);
// Byte[] Buffer = new Byte[byteCount];

byte[] Buffer = System.Text.ASC IIEncoding.ASCI I.GetBytes(sIn) ;

// Transform and return the string.
return Convert.ToBase6 4String(DESEncr ypt.TransformFi nalBlock(Buffer , 0,
Buffer.Length) );
}

Its this very last line that fails - I have tried Length-1 but that doesnt
work, I've also tried creatinf the byte array first, with same result
TIA
Tony