TripleDES encryption problem

[c duden]

I am attempting to encrypt some text and be able to decrypt it at a later
time. I have two methods to do this:

public static Byte[] EncryptText(str ing textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt);
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new
TripleDESCrypto ServiceProvider ();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS
documentation.
System.IO.Memor yStream ms = new System.IO.Memor yStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write);
cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length);

System.IO.Strea mWriter sw = new System.IO.Strea mWriter(cryptos tream);
sw.Write(bytear rayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes, 0,mBytes.Length );
cryptostream.Cl ose();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byt e[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new
TripleDESCrypto ServiceProvider ();
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
System.IO.Memor yStream ms = new System.IO.Memor yStream(bytearr ayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read);
System.IO.Strea mReader SR = new
System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II);
return SR.ReadToEnd();
}

I have tried this about half a hundred ways with the same results :
It chokes on
SR.ReadToEnd(); when atttepting to Decrypt the data that was encrypted by
EncryptText(..)

Length of the data to decrypt is invalid.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.Security .Cryptography.C ryptographicExc eption:
Length of the data to decrypt is invalid.
Can someone explain what is going on and what I am doing wrong. In looking
for insight into this I have seen allot of newsgroup posts where people had
the same problem but no answers.

Thanks,
CMD

[c duden]

Found something interesting that narrows the scope of the problem somewhat.

Here are a set of methods (one set of many I have tried):

public static byte[] DesEncrypt(byte[] data, string hashString)
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToEncrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(40 96);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return bResult;
}
public static byte[] DesDecrypt ( byte[] data, string hashString )
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToDeCrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(da ta.Length);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader(en cStream).ReadTo End();
encStream.Close ();
return ASCIIEncoding.A SCII.GetBytes(s trResult);
}

Doing the following works:
byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword");
byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"password") ;

Response.Write( encrypted);
Response.Write( "<BR>");
Response.Write( decrypted);

But the following Does not work:

byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword");
string encryptedStr = System.Text.ASC IIEncoding.ASCI I.GetString(enc rypted);
byte[] reencrypted = System.Text.ASC IIEncoding.ASCI I.GetBytes(encr yptedStr);
byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(reencryp ted,"password") ;
System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding();
Response.Write( enc.GetString(e ncrypted));
Response.Write( "<BR>");
Response.Write( enc.GetString(d ecrypted));

Somehow converting the output of DesEncrypt to a string and then converting
that string back to a byte array caused the decryption method to bomb with a
"Bad Data" error.

Anyone have any ideas?
"c duden" <cd****@hotmail .com> wrote in message
news:uQ******** ******@TK2MSFTN GP10.phx.gbl...

I am attempting to encrypt some text and be able to decrypt it at a later
time. I have two methods to do this:

public static Byte[] EncryptText(str ing textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt);
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new
TripleDESCrypto ServiceProvider ();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS
documentation.
System.IO.Memor yStream ms = new System.IO.Memor yStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write);
cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length);

System.IO.Strea mWriter sw = new System.IO.Strea mWriter(cryptos tream);
sw.Write(bytear rayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes, 0,mBytes.Length );
cryptostream.Cl ose();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byt e[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new
TripleDESCrypto ServiceProvider ();
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
System.IO.Memor yStream ms = new System.IO.Memor yStream(bytearr ayinput); //Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read);
System.IO.Strea mReader SR = new
System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II);
return SR.ReadToEnd();
}

I have tried this about half a hundred ways with the same results :
It chokes on
SR.ReadToEnd(); when atttepting to Decrypt the data that was encrypted by
EncryptText(..)

Length of the data to decrypt is invalid.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.Security .Cryptography.C ryptographicExc eption:
Length of the data to decrypt is invalid.
Can someone explain what is going on and what I am doing wrong. In looking for insight into this I have seen allot of newsgroup posts where people had the same problem but no answers.

Thanks,
CMD

[c duden]

Ok, I figured out a workaround -- changed everything to use UnicodeEncoding
instead of ASCIIEncoding and it now works. BUT does anyone have any insight
into why this will fail when you use ASCII encoding? I know that in C# all
strings are Unicode Byte Arrays but why would the conversion not work
correctly using the Crypto providers?

Thanks
"c duden" <cd****@hotmail .com> wrote in message
news:uJ******** ******@TK2MSFTN GP10.phx.gbl...

Found something interesting that narrows the scope of the problem somewhat.
Here are a set of methods (one set of many I have tried):

public static byte[] DesEncrypt(byte[] data, string hashString)
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToEncrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(40 96);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return bResult;
}
public static byte[] DesDecrypt ( byte[] data, string hashString )
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToDeCrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(da ta.Length);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader(en cStream).ReadTo End();
encStream.Close ();
return ASCIIEncoding.A SCII.GetBytes(s trResult);
}

Doing the following works:
byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword");
byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"password") ;

Response.Write( encrypted);
Response.Write( "<BR>");
Response.Write( decrypted);

But the following Does not work:

byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword");
string encryptedStr = System.Text.ASC IIEncoding.ASCI I.GetString(enc rypted); byte[] reencrypted = System.Text.ASC IIEncoding.ASCI I.GetBytes(encr yptedStr); byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(reencryp ted,"password") ; System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding();
Response.Write( enc.GetString(e ncrypted));
Response.Write( "<BR>");
Response.Write( enc.GetString(d ecrypted));

Somehow converting the output of DesEncrypt to a string and then converting that string back to a byte array caused the decryption method to bomb with a "Bad Data" error.

Anyone have any ideas?
"c duden" <cd****@hotmail .com> wrote in message
news:uQ******** ******@TK2MSFTN GP10.phx.gbl...

I am attempting to encrypt some text and be able to decrypt it at a later time. I have two methods to do this:

public static Byte[] EncryptText(str ing textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt);
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new TripleDESCrypto ServiceProvider ();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

0x10,

0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS
documentation.
System.IO.Memor yStream ms = new System.IO.Memor yStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write);
cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length);

System.IO.Strea mWriter sw = new System.IO.Strea mWriter(cryptos tream); sw.Write(bytear rayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes, 0,mBytes.Length );
cryptostream.Cl ose();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byt e[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security .Cryptography.T ripleDESCryptoS erviceProvider des = new TripleDESCrypto ServiceProvider ();
string pws = encryptionHash;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16) ;
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

0x10,

0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
System.IO.Memor yStream ms = new

System.IO.Memor yStream(bytearr ayinput);

//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read);
System.IO.Strea mReader SR = new
System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II);
return SR.ReadToEnd();
}

I have tried this about half a hundred ways with the same results :
It chokes on
SR.ReadToEnd(); when atttepting to Decrypt the data that was encrypted by EncryptText(..)

Length of the data to decrypt is invalid.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.Security .Cryptography.C ryptographicExc eption:
Length of the data to decrypt is invalid.
Can someone explain what is going on and what I am doing wrong. In

looking

for insight into this I have seen allot of newsgroup posts where people

had

the same problem but no answers.

Thanks,
CMD

[gcl]

give me your code and I can check..
Your early message causes confusion

-----Original Message-----
Ok, I figured out a workaround -- changed everything to use UnicodeEncodinginstead of ASCIIEncoding and it now works. BUT does anyone have any insightinto why this will fail when you use ASCII encoding? I know that in C# allstrings are Unicode Byte Arrays but why would the conversion not workcorrectly using the Crypto providers?

Thanks
"c duden" <cd****@hotmail .com> wrote in message
news:uJ******* *******@TK2MSFT NGP10.phx.gbl.. .

Found something interesting that narrows the scope of the problem

somewhat.

Here are a set of methods (one set of many I have tried):
public static byte[] DesEncrypt(byte[] data, string hashString) {
//byte[] data = ASCIIEncoding.A SCII.GetBytes (stringToEncryp t); byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes (hashString); byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes (hashString); MemoryStream ms = new MemoryStream(40 96);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return bResult;
}
public static byte[] DesDecrypt ( byte[] data, string hashString ) {
//byte[] data = ASCIIEncoding.A SCII.GetBytes (stringToDeCryp t); byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes (hashString); byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes (hashString); MemoryStream ms = new MemoryStream(da ta.Length);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader (encStream).Rea dToEnd(); encStream.Close ();
return ASCIIEncoding.A SCII.GetBytes(s trResult);
}

Doing the following works:
byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes ("Hello my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt (data,"password "); byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt (encrypted,"pas sword");
Response.Write( encrypted);
Response.Write( "<BR>");
Response.Write( decrypted);

But the following Does not work:

byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes ("Hello my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt (data,"password "); string encryptedStr =System.Text.AS CIIEncoding.ASC II.GetString(en crypted);

byte[] reencrypted =

System.Text.AS CIIEncoding.ASC II.GetBytes(enc ryptedStr);

byte[] decrypted =

NFS.Architectu re.Security.Tex tEncryption.Des Decrypt

(reencrypted,"p assword");

System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding(); Response.Write( enc.GetString(e ncrypted));
Response.Write( "<BR>");
Response.Write( enc.GetString(d ecrypted));

Somehow converting the output of DesEncrypt to a string and thenconverting

that string back to a byte array caused the decryption

method to bomb witha

"Bad Data" error.

Anyone have any ideas?
"c duden" <cd****@hotmail .com> wrote in message
news:uQ******** ******@TK2MSFTN GP10.phx.gbl...

> I am attempting to encrypt some text and be able to decrypt it at a

later > time. I have two methods to do this:
>
> public static Byte[] EncryptText(str ing

textToEncrypt, string > encryptionHash)
> {
> Byte[] bytearrayinput =
> StringAndByteMa nipulation.Conv ertStringToByte Array (textToEncrypt) ; > //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvide
r des =

new > TripleDESCrypto ServiceProvider ();
> // use the default SHA-1 hash algorithm
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes

db = new > System.Security .Cryptography.P asswordDeriveBy tes (pws,new byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,

> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the

example in MS > documentation.
> System.IO.Memor yStream ms = new System.IO.Memor yStream(); > //Create Crypto Stream that transforms text stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateEncr yptor (prndKey,IV),Cr yptoStreamMode. Write); > cryptostream.Wr ite (bytearrayinput ,0,bytearrayinp ut.Length); >
> System.IO.Strea mWriter sw = new

System.IO.Stre amWriter(crypto stream); > sw.Write(bytear rayinput);
> Byte[] mBytes = new Byte[ms.Length-1];
> ms.Position = 0;
> ms.Read(mBytes, 0,mBytes.Length );
> cryptostream.Cl ose();
> ms.Close();
> return mBytes;
> }
>
> public static string DeCryptText(Byt e[] textToDecrypt, string > encryptionHash)
> {
> Byte[] bytearrayinput = textToDecrypt;
> //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvide
r des =new

> TripleDESCrypto ServiceProvider ();
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes

db = new > System.Security .Cryptography.P asswordDeriveBy tes (pws,new byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,

> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
> System.IO.Memor yStream ms = new System.IO.Memor yStream(bytearr ayinput);

> //Create Crypto Stream that transforms text

stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateDecr yptor (prndKey,IV),Cr yptoStreamMode. Read); > System.IO.Strea mReader SR = new
> System.IO.Strea mReader (cryptostream,S ystem.Text.Enco ding.ASCII); > return SR.ReadToEnd();
> }
>
> I have tried this about half a hundred ways with the same results : > It chokes on
> SR.ReadToEnd(); when atttepting to Decrypt the data that was encryptedby > EncryptText(..)
>
> Length of the data to decrypt is invalid.
> Description: An unhandled exception occurred during

the execution of the > current web request. Please review the stack trace for more information > about the error and where it originated in the code.
>
> Exception Details: System.Security .Cryptography.C ryptographicExc eption: > Length of the data to decrypt is invalid.
>
>
> Can someone explain what is going on and what I am

doing wrong. In looking

> for insight into this I have seen allot of newsgroup

posts where people had

> the same problem but no answers.
>
> Thanks,
> CMD
>
>

.

[c duden]

Not sure how it was confusing but this is what I am now using and it works:

public static string DesEncrypt(stri ng stringToEncrypt , string hashString)
{
byte[] data = ConvertStringTo ByteArray(strin gToEncrypt);
string pws = hashString;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] m_bDESKey= db.GetBytes(16) ;
TripleDESCrypto ServiceProvider des = new TripleDESCrypto ServiceProvider ();
des.Mode = CipherMode.CBC;
byte[] m_bDESIV = UnicodeEncoding .Unicode.GetByt es(hashString);
MemoryStream ms = new MemoryStream(40 96);
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return UnicodeEncoding .Unicode.GetStr ing(bResult);
}
public static string DesDecrypt ( string stringToDeCrypt , string
hashString )
{
byte[] data = ConvertStringTo ByteArray(strin gToDeCrypt);
string pws = hashString;
System.Security .Cryptography.P asswordDeriveBy tes db = new
System.Security .Cryptography.P asswordDeriveBy tes(pws,new byte[0]);
byte[] m_bDESKey= db.GetBytes(16) ;
TripleDESCrypto ServiceProvider des = new TripleDESCrypto ServiceProvider ();
des.Mode = CipherMode.CBC;
byte[] m_bDESIV = UnicodeEncoding .Unicode.GetByt es(hashString);
MemoryStream ms = new MemoryStream(da ta.Length);
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader(en cStream).ReadTo End();
encStream.Close ();
return strResult;
}

private Byte[] ConvertStringTo ByteArray(Strin g s)
{
Byte[] returnValue = UnicodeEncoding .Unicode.GetByt es(s);
return returnValue;
}

In my test harness this was how I tested the methods above:

string encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt("Hello
World","passwor d");
string decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"password") ;
Console.WriteLi ne(encrypted);
Console.WriteLi ne(decrypted);
Console.ReadLin e();

Now if you replace UnicodeEncoding .Unicode with ASCIIEncoding.A SCII
everywhere it is used in the code above it will fail when you attempt to
decrypt what is encrypted.

Essentially I would just like a better understanding of why that is. What
is going on internally that makes it fail.

Thanks.
"gcl" <ln*******@comc ast.net> wrote in message
news:02******** *************** *****@phx.gbl.. .

give me your code and I can check..
Your early message causes confusion

-----Original Message-----
Ok, I figured out a workaround -- changed everything to

use UnicodeEncoding

instead of ASCIIEncoding and it now works. BUT does

anyone have any insight

into why this will fail when you use ASCII encoding? I

know that in C# all

strings are Unicode Byte Arrays but why would the

conversion not work

correctly using the Crypto providers?

Thanks
"c duden" <cd****@hotmail .com> wrote in message
news:uJ******* *******@TK2MSFT NGP10.phx.gbl.. .

Found something interesting that narrows the scope of the problem

somewhat.

Here are a set of methods (one set of many I have

tried):
public static byte[] DesEncrypt(byte[] data, string hashString) {
//byte[] data = ASCIIEncoding.A SCII.GetBytes (stringToEncryp t); byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes (hashString); byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes (hashString); MemoryStream ms = new MemoryStream(40 96);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return bResult;
}
public static byte[] DesDecrypt ( byte[] data, string hashString ) {
//byte[] data = ASCIIEncoding.A SCII.GetBytes (stringToDeCryp t); byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes (hashString); byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes (hashString); MemoryStream ms = new MemoryStream(da ta.Length);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader (encStream).Rea dToEnd(); encStream.Close ();
return ASCIIEncoding.A SCII.GetBytes(s trResult);
}

Doing the following works:
byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes ("Hello my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt (data,"password "); byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt (encrypted,"pas sword");
Response.Write( encrypted);
Response.Write( "<BR>");
Response.Write( decrypted);

But the following Does not work:

byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes ("Hello my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt (data,"password "); string encryptedStr =

System.Text.AS CIIEncoding.ASC II.GetString(en crypted);

byte[] reencrypted =

System.Text.AS CIIEncoding.ASC II.GetBytes(enc ryptedStr);

byte[] decrypted =

NFS.Architectu re.Security.Tex tEncryption.Des Decrypt

(reencrypted,"p assword");

System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding(); Response.Write( enc.GetString(e ncrypted));
Response.Write( "<BR>");
Response.Write( enc.GetString(d ecrypted));

Somehow converting the output of DesEncrypt to a string and then

converting

that string back to a byte array caused the decryption

method to bomb with

a

"Bad Data" error.

Anyone have any ideas?
"c duden" <cd****@hotmail .com> wrote in message
news:uQ******** ******@TK2MSFTN GP10.phx.gbl...
> I am attempting to encrypt some text and be able to

decrypt it at a

later

> time. I have two methods to do this:
>
> public static Byte[] EncryptText(str ing

textToEncrypt, string > encryptionHash)
> {
> Byte[] bytearrayinput =
> StringAndByteMa nipulation.Conv ertStringToByte Array (textToEncrypt) ; > //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvide
r des =

new

> TripleDESCrypto ServiceProvider ();
> // use the default SHA-1 hash algorithm
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes

db = new > System.Security .Cryptography.P asswordDeriveBy tes (pws,new byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS > documentation.
> System.IO.Memor yStream ms = new System.IO.Memor yStream(); > //Create Crypto Stream that transforms text stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateEncr yptor (prndKey,IV),Cr yptoStreamMode. Write); > cryptostream.Wr ite (bytearrayinput ,0,bytearrayinp ut.Length); >
> System.IO.Strea mWriter sw = new

System.IO.Stre amWriter(crypto stream);

> sw.Write(bytear rayinput);
> Byte[] mBytes = new Byte[ms.Length-1];
> ms.Position = 0;
> ms.Read(mBytes, 0,mBytes.Length );
> cryptostream.Cl ose();
> ms.Close();
> return mBytes;
> }
>
> public static string DeCryptText(Byt e[] textToDecrypt, string > encryptionHash)
> {
> Byte[] bytearrayinput = textToDecrypt;
> //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvide
r des =

new

> TripleDESCrypto ServiceProvider ();
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes

db = new > System.Security .Cryptography.P asswordDeriveBy tes (pws,new byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
> System.IO.Memor yStream ms = new
System.IO.Memor yStream(bytearr ayinput);
> //Create Crypto Stream that transforms text stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateDecr yptor (prndKey,IV),Cr yptoStreamMode. Read); > System.IO.Strea mReader SR = new
> System.IO.Strea mReader (cryptostream,S ystem.Text.Enco ding.ASCII); > return SR.ReadToEnd();
> }
>
> I have tried this about half a hundred ways with the same results : > It chokes on
> SR.ReadToEnd(); when atttepting to Decrypt the data that was encrypted

by

> EncryptText(..)
>
> Length of the data to decrypt is invalid.
> Description: An unhandled exception occurred during

the execution of the > current web request. Please review the stack trace for more information > about the error and where it originated in the code.
>
> Exception Details: System.Security .Cryptography.C ryptographicExc eption: > Length of the data to decrypt is invalid.
>
>
> Can someone explain what is going on and what I am doing wrong. In looking
> for insight into this I have seen allot of newsgroup posts where people had
> the same problem but no answers.
>
> Thanks,
> CMD
>
>

.

[c duden]

Ok, Michael that makes perfect sense when you put it that way. Follow up
question then -- with the Unicode working verison I insert that encrypted
data into a field in SQL2k -- (nvarchar -- supposed to be able to handle
Unicode values) but when I pull it out it can't unencode it -- fails with
"bad data" error. Is SQL doing something in the translation?
"Michael Giagnocavo [MVP]" <mg*******@Atre vido.net> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

ASCII is only a 7-bit encoding, and your key uses the full 8-bit space
of each byte. Thus, writing your key to ASCII results in some data
being messed up.

-mike
MVP

"c duden" <cd****@hotmail .com> wrote in message
news:u2******** ******@TK2MSFTN GP10.phx.gbl...

Ok, I figured out a workaround -- changed everything to use

UnicodeEncoding

instead of ASCIIEncoding and it now works. BUT does anyone have any

insight

into why this will fail when you use ASCII encoding? I know that in

C# all

strings are Unicode Byte Arrays but why would the conversion not

work

correctly using the Crypto providers?

Thanks
"c duden" <cd****@hotmail .com> wrote in message
news:uJ******** ******@TK2MSFTN GP10.phx.gbl...

Found something interesting that narrows the scope of the problem

somewhat.

Here are a set of methods (one set of many I have tried):

public static byte[] DesEncrypt(byte[] data, string hashString)
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToEncrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(40 96);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateEncry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Write);
encStream.Write (data,0,data.Le ngth);
encStream.Flush FinalBlock();
//calculate the length of the encrypted data
byte[] bResult = new byte[ms.Position];
ms.Position = 0;
ms.Read(bResult , 0, bResult.Length) ;
encStream.Close ();
return bResult;
}
public static byte[] DesDecrypt ( byte[] data, string hashString )
{
//byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToDeCrypt) ;
byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
MemoryStream ms = new MemoryStream(da ta.Length);
DES des = new DESCryptoServic eProvider() ;
CryptoStream encStream = new CryptoStream(ms ,
des.CreateDecry ptor(m_bDESKey, m_bDESIV),
CryptoStreamMod e.Read);
ms.Write(data,0 ,data.Length);
ms.Position = 0;
string strResult = new StreamReader(en cStream).ReadTo End();
encStream.Close ();
return ASCIIEncoding.A SCII.GetBytes(s trResult);
}

Doing the following works:
byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); byte[] decrypted =
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"passwor
d");
Response.Write( encrypted);
Response.Write( "<BR>");
Response.Write( decrypted);

But the following Does not work:

byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend"); byte[] encrypted =
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); string encryptedStr =

System.Text.ASC IIEncoding.ASCI I.GetString(enc rypted);

byte[] reencrypted =

System.Text.ASC IIEncoding.ASCI I.GetBytes(encr yptedStr);

byte[] decrypted =

NFS.Architectur e.Security.Text Encryption.DesD ecrypt(reencryp ted,"passw
ord");

System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding();
Response.Write( enc.GetString(e ncrypted));
Response.Write( "<BR>");
Response.Write( enc.GetString(d ecrypted));

Somehow converting the output of DesEncrypt to a string and then

converting

that string back to a byte array caused the decryption method to bomb with

a

"Bad Data" error.

Anyone have any ideas?
"c duden" <cd****@hotmail .com> wrote in message
news:uQ******** ******@TK2MSFTN GP10.phx.gbl...
> I am attempting to encrypt some text and be able to decrypt it

at a

later

> time. I have two methods to do this:
>
> public static Byte[] EncryptText(str ing textToEncrypt, string
> encryptionHash)
> {
> Byte[] bytearrayinput =
>

StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt); > //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvider des =

new

> TripleDESCrypto ServiceProvider ();
> // use the default SHA-1 hash algorithm
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes db = new
> System.Security .Cryptography.P asswordDeriveBy tes(pws,new

byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS
> documentation.
> System.IO.Memor yStream ms = new System.IO.Memor yStream();
> //Create Crypto Stream that transforms text stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write
); > cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length);
>
> System.IO.Strea mWriter sw = new

System.IO.Strea mWriter(cryptos tream);

> sw.Write(bytear rayinput);
> Byte[] mBytes = new Byte[ms.Length-1];
> ms.Position = 0;
> ms.Read(mBytes, 0,mBytes.Length );
> cryptostream.Cl ose();
> ms.Close();
> return mBytes;
> }
>
> public static string DeCryptText(Byt e[] textToDecrypt, string
> encryptionHash)
> {
> Byte[] bytearrayinput = textToDecrypt;
> //DES instance
> System.Security .Cryptography.T ripleDESCryptoS erviceProvider des =

new

> TripleDESCrypto ServiceProvider ();
> string pws = encryptionHash;
> System.Security .Cryptography.P asswordDeriveBy tes db = new
> System.Security .Cryptography.P asswordDeriveBy tes(pws,new

byte[0]); > byte[] prndKey= db.GetBytes(16) ;
> byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
> 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
> System.IO.Memor yStream ms = new
System.IO.Memor yStream(bytearr ayinput);
> //Create Crypto Stream that transforms text stream using Triple DES > encryption
> CryptoStream cryptostream = new
> CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read)
; > System.IO.Strea mReader SR = new
> System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II);
> return SR.ReadToEnd();
> }
>
> I have tried this about half a hundred ways with the same results : > It chokes on
> SR.ReadToEnd(); when atttepting to Decrypt the data that was encrypted

by

> EncryptText(..)
>
> Length of the data to decrypt is invalid.
> Description: An unhandled exception occurred during the

execution of the > current web request. Please review the stack trace for more information > about the error and where it originated in the code.
>
> Exception Details: System.Security .Cryptography.C ryptographicExc eption: > Length of the data to decrypt is invalid.
>
>
> Can someone explain what is going on and what I am doing wrong. In looking
> for insight into this I have seen allot of newsgroup posts where people had
> the same problem but no answers.
>
> Thanks,
> CMD
>
>

[Michael Giagnocavo [MVP]]

Store as a varchar or char, and use Base64 (Convert.ToBase 64String) to
get your byte[] to an easily managed string.
-mike
MVP

"c duden" <cd****@hotmail .com> wrote in message
news:ei******** ******@TK2MSFTN GP12.phx.gbl...

Ok, Michael that makes perfect sense when you put it that way. Follow up question then -- with the Unicode working verison I insert that encrypted data into a field in SQL2k -- (nvarchar -- supposed to be able to handle Unicode values) but when I pull it out it can't unencode it -- fails with "bad data" error. Is SQL doing something in the translation?
"Michael Giagnocavo [MVP]" <mg*******@Atre vido.net> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

ASCII is only a 7-bit encoding, and your key uses the full 8-bit space of each byte. Thus, writing your key to ASCII results in some data being messed up.

-mike
MVP

"c duden" <cd****@hotmail .com> wrote in message
news:u2******** ******@TK2MSFTN GP10.phx.gbl...

Ok, I figured out a workaround -- changed everything to use

UnicodeEncoding

instead of ASCIIEncoding and it now works. BUT does anyone have any

insight

into why this will fail when you use ASCII encoding? I know

that in C# all

strings are Unicode Byte Arrays but why would the conversion not

work

correctly using the Crypto providers?

Thanks
"c duden" <cd****@hotmail .com> wrote in message
news:uJ******** ******@TK2MSFTN GP10.phx.gbl...
> Found something interesting that narrows the scope of the

problem somewhat.
>
> Here are a set of methods (one set of many I have tried):
>
> public static byte[] DesEncrypt(byte[] data, string hashString) > {
> //byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToEncrypt) ;
> byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
> byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
> MemoryStream ms = new MemoryStream(40 96);
> DES des = new DESCryptoServic eProvider() ;
> CryptoStream encStream = new CryptoStream(ms ,
> des.CreateEncry ptor(m_bDESKey, m_bDESIV),
> CryptoStreamMod e.Write);
> encStream.Write (data,0,data.Le ngth);
> encStream.Flush FinalBlock();
> //calculate the length of the encrypted data
> byte[] bResult = new byte[ms.Position];
> ms.Position = 0;
> ms.Read(bResult , 0, bResult.Length) ;
> encStream.Close ();
> return bResult;
> }
> public static byte[] DesDecrypt ( byte[] data, string hashString ) > {
> //byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToDeCrypt) ;
> byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
> byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
> MemoryStream ms = new MemoryStream(da ta.Length);
> DES des = new DESCryptoServic eProvider() ;
> CryptoStream encStream = new CryptoStream(ms ,
> des.CreateDecry ptor(m_bDESKey, m_bDESIV),
> CryptoStreamMod e.Read);
> ms.Write(data,0 ,data.Length);
> ms.Position = 0;
> string strResult = new StreamReader(en cStream).ReadTo End();
> encStream.Close ();
> return ASCIIEncoding.A SCII.GetBytes(s trResult);
> }
>
> Doing the following works:
> byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");

> byte[] encrypted =
>

NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); > byte[] decrypted =
>

NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"passwor d");

>
> Response.Write( encrypted);
> Response.Write( "<BR>");
> Response.Write( decrypted);
>
> But the following Does not work:
>
> byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my

friend");

> byte[] encrypted =
>

NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); > string encryptedStr =
System.Text.ASC IIEncoding.ASCI I.GetString(enc rypted);
> byte[] reencrypted =
System.Text.ASC IIEncoding.ASCI I.GetBytes(encr yptedStr);
> byte[] decrypted =
>

NFS.Architectur e.Security.Text Encryption.DesD ecrypt(reencryp ted,"passw ord");

> System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding(); > Response.Write( enc.GetString(e ncrypted));
> Response.Write( "<BR>");
> Response.Write( enc.GetString(d ecrypted));
>
> Somehow converting the output of DesEncrypt to a string and then converting
> that string back to a byte array caused the decryption method to

bomb with

a
> "Bad Data" error.
>
> Anyone have any ideas?
>
>
> "c duden" <cd****@hotmail .com> wrote in message
> news:uQ******** ******@TK2MSFTN GP10.phx.gbl...
> > I am attempting to encrypt some text and be able to decrypt

it at a

later
> > time. I have two methods to do this:
> >
> > public static Byte[] EncryptText(str ing textToEncrypt,

string > > encryptionHash)
> > {
> > Byte[] bytearrayinput =
> >

StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt);

> > //DES instance
> > System.Security .Cryptography.T ripleDESCryptoS erviceProvider des =

new
> > TripleDESCrypto ServiceProvider ();
> > // use the default SHA-1 hash algorithm
> > string pws = encryptionHash;
> > System.Security .Cryptography.P asswordDeriveBy tes db =

new > > System.Security .Cryptography.P asswordDeriveBy tes(pws,new

byte[0]);

> > byte[] prndKey= db.GetBytes(16) ;
> > byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

> 0x10,
> > 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in

MS > > documentation.
> > System.IO.Memor yStream ms = new System.IO.Memor yStream(); > > //Create Crypto Stream that transforms text stream using

Triple DES

> > encryption
> > CryptoStream cryptostream = new
> >

CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write );

> > cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length); > >
> > System.IO.Strea mWriter sw = new
System.IO.Strea mWriter(cryptos tream);
> > sw.Write(bytear rayinput);
> > Byte[] mBytes = new Byte[ms.Length-1];
> > ms.Position = 0;
> > ms.Read(mBytes, 0,mBytes.Length );
> > cryptostream.Cl ose();
> > ms.Close();
> > return mBytes;
> > }
> >
> > public static string DeCryptText(Byt e[] textToDecrypt, string > > encryptionHash)
> > {
> > Byte[] bytearrayinput = textToDecrypt;
> > //DES instance
> > System.Security .Cryptography.T ripleDESCryptoS erviceProvider

des =

new
> > TripleDESCrypto ServiceProvider ();
> > string pws = encryptionHash;
> > System.Security .Cryptography.P asswordDeriveBy tes db =

new > > System.Security .Cryptography.P asswordDeriveBy tes(pws,new

byte[0]);

> > byte[] prndKey= db.GetBytes(16) ;
> > byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

> 0x10,
> > 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
> > System.IO.Memor yStream ms = new
> System.IO.Memor yStream(bytearr ayinput);
> > //Create Crypto Stream that transforms text stream using

Triple DES

> > encryption
> > CryptoStream cryptostream = new
> >

CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read) ;

> > System.IO.Strea mReader SR = new
> >

System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II); > > return SR.ReadToEnd();
> > }
> >
> > I have tried this about half a hundred ways with the same

results :

> > It chokes on
> > SR.ReadToEnd(); when atttepting to Decrypt the data that was

encrypted

by
> > EncryptText(..)
> >
> > Length of the data to decrypt is invalid.
> > Description: An unhandled exception occurred during the

execution of the

> > current web request. Please review the stack trace for more

information

> > about the error and where it originated in the code.
> >
> > Exception Details:

System.Security .Cryptography.C ryptographicExc eption:

> > Length of the data to decrypt is invalid.
> >
> >
> > Can someone explain what is going on and what I am doing

wrong. In

> looking
> > for insight into this I have seen allot of newsgroup posts

where people

> had
> > the same problem but no answers.
> >
> > Thanks,
> > CMD
> >
> >
>
>

[c duden]

Converting to and from Base64String was the ticket. Thanks much, appreciate
the help.

"Michael Giagnocavo [MVP]" <mg*******@Atre vido.net> wrote in message
news:ek******** ******@TK2MSFTN GP10.phx.gbl...

Store as a varchar or char, and use Base64 (Convert.ToBase 64String) to
get your byte[] to an easily managed string.
-mike
MVP

"c duden" <cd****@hotmail .com> wrote in message
news:ei******** ******@TK2MSFTN GP12.phx.gbl...

Ok, Michael that makes perfect sense when you put it that way.

Follow up

question then -- with the Unicode working verison I insert that

encrypted

data into a field in SQL2k -- (nvarchar -- supposed to be able to

handle

Unicode values) but when I pull it out it can't unencode it -- fails

with

"bad data" error. Is SQL doing something in the translation?
"Michael Giagnocavo [MVP]" <mg*******@Atre vido.net> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

ASCII is only a 7-bit encoding, and your key uses the full 8-bit space of each byte. Thus, writing your key to ASCII results in some data being messed up.

-mike
MVP

"c duden" <cd****@hotmail .com> wrote in message
news:u2******** ******@TK2MSFTN GP10.phx.gbl...
> Ok, I figured out a workaround -- changed everything to use
UnicodeEncoding
> instead of ASCIIEncoding and it now works. BUT does anyone have any insight
> into why this will fail when you use ASCII encoding? I know that in C# all
> strings are Unicode Byte Arrays but why would the conversion not
work
> correctly using the Crypto providers?
>
> Thanks
>
>
> "c duden" <cd****@hotmail .com> wrote in message
> news:uJ******** ******@TK2MSFTN GP10.phx.gbl...
> > Found something interesting that narrows the scope of the problem > somewhat.
> >
> > Here are a set of methods (one set of many I have tried):
> >
> > public static byte[] DesEncrypt(byte[] data, string hashString) > > {
> > //byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToEncrypt) ;
> > byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
> > byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
> > MemoryStream ms = new MemoryStream(40 96);
> > DES des = new DESCryptoServic eProvider() ;
> > CryptoStream encStream = new CryptoStream(ms ,
> > des.CreateEncry ptor(m_bDESKey, m_bDESIV),
> > CryptoStreamMod e.Write);
> > encStream.Write (data,0,data.Le ngth);
> > encStream.Flush FinalBlock();
> > //calculate the length of the encrypted data
> > byte[] bResult = new byte[ms.Position];
> > ms.Position = 0;
> > ms.Read(bResult , 0, bResult.Length) ;
> > encStream.Close ();
> > return bResult;
> > }
> > public static byte[] DesDecrypt ( byte[] data, string hashString ) > > {
> > //byte[] data = ASCIIEncoding.A SCII.GetBytes(s tringToDeCrypt) ;
> > byte[] m_bDESKey = ASCIIEncoding.A SCII.GetBytes(h ashString);
> > byte[] m_bDESIV = ASCIIEncoding.A SCII.GetBytes(h ashString);
> > MemoryStream ms = new MemoryStream(da ta.Length);
> > DES des = new DESCryptoServic eProvider() ;
> > CryptoStream encStream = new CryptoStream(ms ,
> > des.CreateDecry ptor(m_bDESKey, m_bDESIV),
> > CryptoStreamMod e.Read);
> > ms.Write(data,0 ,data.Length);
> > ms.Position = 0;
> > string strResult = new StreamReader(en cStream).ReadTo End();
> > encStream.Close ();
> > return ASCIIEncoding.A SCII.GetBytes(s trResult);
> > }
> >
> > Doing the following works:
> > byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
> > byte[] encrypted =
> >
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); > > byte[] decrypted =
> >
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(encrypte d,"passwor d");
> >
> > Response.Write( encrypted);
> > Response.Write( "<BR>");
> > Response.Write( decrypted);
> >
> > But the following Does not work:
> >
> > byte[] data = System.Text.ASC IIEncoding.ASCI I.GetBytes("Hel lo my friend");
> > byte[] encrypted =
> >
NFS.Architectur e.Security.Text Encryption.DesE ncrypt(data,"pa ssword"); > > string encryptedStr =
> System.Text.ASC IIEncoding.ASCI I.GetString(enc rypted);
> > byte[] reencrypted =
> System.Text.ASC IIEncoding.ASCI I.GetBytes(encr yptedStr);
> > byte[] decrypted =
> >
>
NFS.Architectur e.Security.Text Encryption.DesD ecrypt(reencryp ted,"passw ord");
> > System.Text.ASC IIEncoding enc = new System.Text.ASC IIEncoding(); > > Response.Write( enc.GetString(e ncrypted));
> > Response.Write( "<BR>");
> > Response.Write( enc.GetString(d ecrypted));
> >
> > Somehow converting the output of DesEncrypt to a string and then > converting
> > that string back to a byte array caused the decryption method to bomb with
> a
> > "Bad Data" error.
> >
> > Anyone have any ideas?
> >
> >
> > "c duden" <cd****@hotmail .com> wrote in message
> > news:uQ******** ******@TK2MSFTN GP10.phx.gbl...
> > > I am attempting to encrypt some text and be able to decrypt it at a
> later
> > > time. I have two methods to do this:
> > >
> > > public static Byte[] EncryptText(str ing textToEncrypt, string > > > encryptionHash)
> > > {
> > > Byte[] bytearrayinput =
> > >
StringAndByteMa nipulation.Conv ertStringToByte Array(textToEnc rypt);
> > > //DES instance
> > > System.Security .Cryptography.T ripleDESCryptoS erviceProvider des =
> new
> > > TripleDESCrypto ServiceProvider ();
> > > // use the default SHA-1 hash algorithm
> > > string pws = encryptionHash;
> > > System.Security .Cryptography.P asswordDeriveBy tes db = new > > > System.Security .Cryptography.P asswordDeriveBy tes(pws,new
byte[0]);
> > > byte[] prndKey= db.GetBytes(16) ;
> > > byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
> > 0x10,
> > > 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS > > > documentation.
> > > System.IO.Memor yStream ms = new System.IO.Memor yStream(); > > > //Create Crypto Stream that transforms text stream using
Triple DES
> > > encryption
> > > CryptoStream cryptostream = new
> > >
CryptoStream(ms ,des.CreateEncr yptor(prndKey,I V),CryptoStream Mode.Write );
> > > cryptostream.Wr ite(bytearrayin put,0,bytearray input.Length); > > >
> > > System.IO.Strea mWriter sw = new
> System.IO.Strea mWriter(cryptos tream);
> > > sw.Write(bytear rayinput);
> > > Byte[] mBytes = new Byte[ms.Length-1];
> > > ms.Position = 0;
> > > ms.Read(mBytes, 0,mBytes.Length );
> > > cryptostream.Cl ose();
> > > ms.Close();
> > > return mBytes;
> > > }
> > >
> > > public static string DeCryptText(Byt e[] textToDecrypt, string > > > encryptionHash)
> > > {
> > > Byte[] bytearrayinput = textToDecrypt;
> > > //DES instance
> > > System.Security .Cryptography.T ripleDESCryptoS erviceProvider des =
> new
> > > TripleDESCrypto ServiceProvider ();
> > > string pws = encryptionHash;
> > > System.Security .Cryptography.P asswordDeriveBy tes db = new > > > System.Security .Cryptography.P asswordDeriveBy tes(pws,new
byte[0]);
> > > byte[] prndKey= db.GetBytes(16) ;
> > > byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
> > 0x10,
> > > 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
> > > System.IO.Memor yStream ms = new
> > System.IO.Memor yStream(bytearr ayinput);
> > > //Create Crypto Stream that transforms text stream using
Triple DES
> > > encryption
> > > CryptoStream cryptostream = new
> > >
CryptoStream(ms ,des.CreateDecr yptor(prndKey,I V),CryptoStream Mode.Read) ;
> > > System.IO.Strea mReader SR = new
> > > System.IO.Strea mReader(cryptos tream,System.Te xt.Encoding.ASC II); > > > return SR.ReadToEnd();
> > > }
> > >
> > > I have tried this about half a hundred ways with the same
results :
> > > It chokes on
> > > SR.ReadToEnd(); when atttepting to Decrypt the data that was
encrypted
> by
> > > EncryptText(..)
> > >
> > > Length of the data to decrypt is invalid.
> > > Description: An unhandled exception occurred during the
execution of the
> > > current web request. Please review the stack trace for more
information
> > > about the error and where it originated in the code.
> > >
> > > Exception Details:
System.Security .Cryptography.C ryptographicExc eption:
> > > Length of the data to decrypt is invalid.
> > >
> > >
> > > Can someone explain what is going on and what I am doing wrong. In
> > looking
> > > for insight into this I have seen allot of newsgroup posts where people
> > had
> > > the same problem but no answers.
> > >
> > > Thanks,
> > > CMD
> > >
> > >
> >
> >
>
>