TripleDES encryption problem

C

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(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read);
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
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

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.ASCII.GetBytes(stringToEncrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(4096);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateEncryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Write);
encStream.Write(data,0,data.Length);
encStream.FlushFinalBlock();
//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.ASCII.GetBytes(stringToDeCrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(data.Length);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateDecryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Read);
ms.Write(data,0,data.Length);
ms.Position = 0;
string strResult = new StreamReader(encStream).ReadToEnd();
encStream.Close();
return ASCIIEncoding.ASCII.GetBytes(strResult);
}

Doing the following works:
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
byte[] decrypted =
NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"password");

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

But the following Does not work:

byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
string encryptedStr = System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
byte[] reencrypted = System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
byte[] decrypted =
NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"password");
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Response.Write(enc.GetString(encrypted));
Response.Write("<BR>");
Response.Write(enc.GetString(decrypted));

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 said:
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(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read);
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
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
Click to expand...
 
C

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 said:
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.ASCII.GetBytes(stringToEncrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(4096);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateEncryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Write);
encStream.Write(data,0,data.Length);
encStream.FlushFinalBlock();
//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.ASCII.GetBytes(stringToDeCrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(data.Length);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateDecryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Read);
ms.Write(data,0,data.Length);
ms.Position = 0;
string strResult = new StreamReader(encStream).ReadToEnd();
encStream.Close();
return ASCIIEncoding.ASCII.GetBytes(strResult);
}

Doing the following works:
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
byte[] decrypted =
NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"password");

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

But the following Does not work:

byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
string encryptedStr = System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
byte[] reencrypted = System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
byte[] decrypted =
NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"password");
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Response.Write(enc.GetString(encrypted));
Response.Write("<BR>");
Response.Write(enc.GetString(decrypted));

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 said:
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(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider des = new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read);
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
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
Click to expand...
Click to expand...
 
C

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 said:
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 said:
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 said:
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.ASCII.GetBytes(stringToEncrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(4096);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateEncryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Write);
encStream.Write(data,0,data.Length);
encStream.FlushFinalBlock();
//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.ASCII.GetBytes(stringToDeCrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(data.Length);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateDecryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Read);
ms.Write(data,0,data.Length);
ms.Position = 0;
string strResult = new StreamReader(encStream).ReadToEnd();
encStream.Close();
return ASCIIEncoding.ASCII.GetBytes(strResult);
}

Doing the following works:
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
byte[] decrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"passwor
d");
Response.Write(encrypted);
Response.Write("<BR>");
Response.Write(decrypted);

But the following Does not work:

byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my friend");
byte[] encrypted =
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
string encryptedStr = System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
byte[] reencrypted = System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
byte[] decrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"passw
ord");
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Response.Write(enc.GetString(encrypted));
Response.Write("<BR>");
Response.Write(enc.GetString(decrypted));

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

Anyone have any ideas?


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

public static Byte[] EncryptText(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider
Click to expand...
des =
new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
Click to expand...
CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write
);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider
Click to expand...
des =
new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new
System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
Click to expand...
CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read)
;
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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
Click to expand...
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.CryptographicException:
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
Click to expand...
Click to expand...
Click to expand...
 
Y

Yan-Hong Huang[MSFT]

Hello,

I am not too familar with DB. But on my opinion, for the encrypted data, I suggest you try binary type field in sql server to see if
the problem could be resolved. Thanks.

Best regards,
Yanhong Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
!From: "c duden" <[email protected]>
!References: <[email protected]> <[email protected]>
<[email protected]> <#[email protected]>
!Subject: Re: TripleDES encryption problem
!Date: Tue, 22 Jul 2003 14:48:29 -0700
!Lines: 242
!X-Priority: 3
!X-MSMail-Priority: Normal
!X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
!X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
!Message-ID: <[email protected]>
!Newsgroups:
microsoft.public.dotnet.framework,microsoft.public.dotnet.general,microsoft.public.dotnet.languages.csharp,microsoft.public.
dotnet.security
!NNTP-Posting-Host: 204.120.69.230
!Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP12.phx.gbl
!Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.general:102083 microsoft.public.dotnet.languages.csharp:171064
microsoft.public.dotnet.security:2181 microsoft.public.dotnet.framework:49580
!X-Tomcat-NG: microsoft.public.dotnet.framework
!
!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?
!
!
!!> 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
!>
!> !> > 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
!> >
!> >
!> > !> > > 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.ASCII.GetBytes(stringToEncrypt);
!> > > byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
!> > > byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
!> > > MemoryStream ms = new MemoryStream(4096);
!> > > DES des = new DESCryptoServiceProvider() ;
!> > > CryptoStream encStream = new CryptoStream(ms,
!> > > des.CreateEncryptor(m_bDESKey, m_bDESIV),
!> > > CryptoStreamMode.Write);
!> > > encStream.Write(data,0,data.Length);
!> > > encStream.FlushFinalBlock();
!> > > //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.ASCII.GetBytes(stringToDeCrypt);
!> > > byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
!> > > byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
!> > > MemoryStream ms = new MemoryStream(data.Length);
!> > > DES des = new DESCryptoServiceProvider() ;
!> > > CryptoStream encStream = new CryptoStream(ms,
!> > > des.CreateDecryptor(m_bDESKey, m_bDESIV),
!> > > CryptoStreamMode.Read);
!> > > ms.Write(data,0,data.Length);
!> > > ms.Position = 0;
!> > > string strResult = new StreamReader(encStream).ReadToEnd();
!> > > encStream.Close();
!> > > return ASCIIEncoding.ASCII.GetBytes(strResult);
!> > > }
!> > >
!> > > Doing the following works:
!> > > byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my
!> friend");
!> > > byte[] encrypted =
!> > >
!> NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
!> > > byte[] decrypted =
!> > >
!> NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"passwor
!> d");
!> > >
!> > > Response.Write(encrypted);
!> > > Response.Write("<BR>");
!> > > Response.Write(decrypted);
!> > >
!> > > But the following Does not work:
!> > >
!> > > byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my
!> friend");
!> > > byte[] encrypted =
!> > >
!> NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
!> > > string encryptedStr =
!> > System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
!> > > byte[] reencrypted =
!> > System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
!> > > byte[] decrypted =
!> > >
!> >
!> NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"passw
!> ord");
!> > > System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
!> > > Response.Write(enc.GetString(encrypted));
!> > > Response.Write("<BR>");
!> > > Response.Write(enc.GetString(decrypted));
!> > >
!> > > 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?
!> > >
!> > >
!> > > !> > > > 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(string textToEncrypt, string
!> > > > encryptionHash)
!> > > > {
!> > > > Byte[] bytearrayinput =
!> > > >
!> StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
!> > > > //DES instance
!> > > > System.Security.Cryptography.TripleDESCryptoServiceProvider
!> des =
!> > new
!> > > > TripleDESCryptoServiceProvider();
!> > > > // use the default SHA-1 hash algorithm
!> > > > string pws = encryptionHash;
!> > > > System.Security.Cryptography.PasswordDeriveBytes db = new
!> > > > System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
!> > > > //Create Crypto Stream that transforms text stream using
!> Triple DES
!> > > > encryption
!> > > > CryptoStream cryptostream = new
!> > > >
!> CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write
!> );
!> > > > cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);
!> > > >
!> > > > System.IO.StreamWriter sw = new
!> > System.IO.StreamWriter(cryptostream);
!> > > > sw.Write(bytearrayinput);
!> > > > Byte[] mBytes = new Byte[ms.Length-1];
!> > > > ms.Position = 0;
!> > > > ms.Read(mBytes,0,mBytes.Length);
!> > > > cryptostream.Close();
!> > > > ms.Close();
!> > > > return mBytes;
!> > > > }
!> > > >
!> > > > public static string DeCryptText(Byte[] textToDecrypt, string
!> > > > encryptionHash)
!> > > > {
!> > > > Byte[] bytearrayinput = textToDecrypt;
!> > > > //DES instance
!> > > > System.Security.Cryptography.TripleDESCryptoServiceProvider
!> des =
!> > new
!> > > > TripleDESCryptoServiceProvider();
!> > > > string pws = encryptionHash;
!> > > > System.Security.Cryptography.PasswordDeriveBytes db = new
!> > > > System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new
!> > > System.IO.MemoryStream(bytearrayinput);
!> > > > //Create Crypto Stream that transforms text stream using
!> Triple DES
!> > > > encryption
!> > > > CryptoStream cryptostream = new
!> > > >
!> CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read)
!> ;
!> > > > System.IO.StreamReader SR = new
!> > > > System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
!> > > > 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
!> > > >
!> > > >
!> > >
!> > >
!> >
!> >
!>
!>
!
!
!
 
M

Michael Giagnocavo [MVP]

Store as a varchar or char, and use Base64 (Convert.ToBase64String) to
get your byte[] to an easily managed string.
-mike
MVP

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

Thanks


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.ASCII.GetBytes(stringToEncrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(4096);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateEncryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Write);
encStream.Write(data,0,data.Length);
encStream.FlushFinalBlock();
//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.ASCII.GetBytes(stringToDeCrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(data.Length);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateDecryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Read);
ms.Write(data,0,data.Length);
ms.Position = 0;
string strResult = new StreamReader(encStream).ReadToEnd();
encStream.Close();
return ASCIIEncoding.ASCII.GetBytes(strResult);
}

Doing the following works:
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello
Click to expand...
my
friend");
byte[] encrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
byte[] decrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"passwor
d");
Response.Write(encrypted);
Response.Write("<BR>");
Response.Write(decrypted);

But the following Does not work:

byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello
Click to expand...
my
friend");
byte[] encrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
string encryptedStr =
System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
byte[] reencrypted =
System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
byte[] decrypted =
Click to expand...
NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"passw
ord");
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Response.Write(enc.GetString(encrypted));
Response.Write("<BR>");
Response.Write(enc.GetString(decrypted));

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

Anyone have any ideas?


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

public static Byte[] EncryptText(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =
StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
Click to expand...
System.Security.Cryptography.TripleDESCryptoServiceProvider
des =
new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16);
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
Click to expand...
0x08,
0x09,
0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; // from the example in MS
documentation.
System.IO.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
Click to expand...
CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write
);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new
System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
Click to expand...
System.Security.Cryptography.TripleDESCryptoServiceProvider
des =
new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(pws,new byte[0]);
byte[] prndKey= db.GetBytes(16);
byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
Click to expand...
0x08,
0x09,
0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16};
System.IO.MemoryStream ms = new
System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using Triple DES
encryption
CryptoStream cryptostream = new
Click to expand...
CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read)
;
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
Length of the data to decrypt is invalid.


Can someone explain what is going on and what I am doing
Click to expand...
wrong.
In
looking
for insight into this I have seen allot of newsgroup posts
Click to expand...
where
people
had
the same problem but no answers.

Thanks,
CMD
Click to expand...
Click to expand...
Click to expand...
 
C

c duden

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



Michael Giagnocavo said:
Store as a varchar or char, and use Base64 (Convert.ToBase64String) to
get your byte[] to an easily managed string.
-mike
MVP

c duden said:
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 said:
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

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


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.ASCII.GetBytes(stringToEncrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(4096);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateEncryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Write);
encStream.Write(data,0,data.Length);
encStream.FlushFinalBlock();
//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.ASCII.GetBytes(stringToDeCrypt);
byte[] m_bDESKey = ASCIIEncoding.ASCII.GetBytes(hashString);
byte[] m_bDESIV = ASCIIEncoding.ASCII.GetBytes(hashString);
MemoryStream ms = new MemoryStream(data.Length);
DES des = new DESCryptoServiceProvider() ;
CryptoStream encStream = new CryptoStream(ms,
des.CreateDecryptor(m_bDESKey, m_bDESIV),
CryptoStreamMode.Read);
ms.Write(data,0,data.Length);
ms.Position = 0;
string strResult = new StreamReader(encStream).ReadToEnd();
encStream.Close();
return ASCIIEncoding.ASCII.GetBytes(strResult);
}

Doing the following works:
byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my
friend");
byte[] encrypted =

NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
byte[] decrypted =

NFS.Architecture.Security.TextEncryption.DesDecrypt(encrypted,"passwor
d");

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

But the following Does not work:

byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes("Hello my
friend");
byte[] encrypted =

NFS.Architecture.Security.TextEncryption.DesEncrypt(data,"password");
string encryptedStr =
System.Text.ASCIIEncoding.ASCII.GetString(encrypted);
byte[] reencrypted =
System.Text.ASCIIEncoding.ASCII.GetBytes(encryptedStr);
byte[] decrypted =


NFS.Architecture.Security.TextEncryption.DesDecrypt(reencrypted,"passw
ord");
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
Response.Write(enc.GetString(encrypted));
Response.Write("<BR>");
Response.Write(enc.GetString(decrypted));

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?


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(string textToEncrypt, string
encryptionHash)
{
Byte[] bytearrayinput =

StringAndByteManipulation.ConvertStringToByteArray(textToEncrypt);
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider
des =
new
TripleDESCryptoServiceProvider();
// use the default SHA-1 hash algorithm
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new System.IO.MemoryStream();
//Create Crypto Stream that transforms text stream using
Triple DES
encryption
CryptoStream cryptostream = new

CryptoStream(ms,des.CreateEncryptor(prndKey,IV),CryptoStreamMode.Write
);
cryptostream.Write(bytearrayinput,0,bytearrayinput.Length);

System.IO.StreamWriter sw = new
System.IO.StreamWriter(cryptostream);
sw.Write(bytearrayinput);
Byte[] mBytes = new Byte[ms.Length-1];
ms.Position = 0;
ms.Read(mBytes,0,mBytes.Length);
cryptostream.Close();
ms.Close();
return mBytes;
}

public static string DeCryptText(Byte[] textToDecrypt, string
encryptionHash)
{
Byte[] bytearrayinput = textToDecrypt;
//DES instance
System.Security.Cryptography.TripleDESCryptoServiceProvider
des =
new
TripleDESCryptoServiceProvider();
string pws = encryptionHash;
System.Security.Cryptography.PasswordDeriveBytes db = new
System.Security.Cryptography.PasswordDeriveBytes(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.MemoryStream ms = new
System.IO.MemoryStream(bytearrayinput);
//Create Crypto Stream that transforms text stream using
Triple DES
encryption
CryptoStream cryptostream = new

CryptoStream(ms,des.CreateDecryptor(prndKey,IV),CryptoStreamMode.Read)
;
System.IO.StreamReader SR = new
System.IO.StreamReader(cryptostream,System.Text.Encoding.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.CryptographicException:
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
Click to expand...
Click to expand...
Click to expand...
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

Decryption 1
IO.Compression and Encryption 3
Can I append to an encrypted text file? 1
Problem with encryption/decryption 7
Decrypt String Issue 2
Encrypt text to only viewable characters?? 3
.NET encryption 3
Simple string encryption (solution) 2

Top