"Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
news:eEQCGgsvFHA.1132@TK2MSFTNGP10.phx.gbl...
> I'm experiencing something that I am not certain is normal or a problem.
> I have a byte array that, once run through a method that encrypts using
> Triple DES, the array now "appears" to be truncated.  By this I mean that
> the final three bytes are now showing 0 (zero) in the debugger.  When I
> decrypt, the string is now missing characters.
>
> I encrypt like this (no, that is not the actual method name.  yes, I have
> this hardcoded for testing only and have omitted the key and iv array
> values in this sample) :
>
> public int Encrypt(ref MemoryStream a, ref MemoryStream b)
> {
>    // the memory streams have a byte[] as the backing source
>    byte[] k = {  };
>    byte[] i = { };
>    byte[] encBuffer = new byte[a.Length];
>    int iRead = 0, iTally = 0;
>
>    TripleDESCryptoServiceProvider tdes = new
> TripleDESCryptoServiceProvider();
>    tdes.Key = k;
>    tdes.IV = i;
>    CryptoStream encStream = new CryptoStream(b, tdes.CreateEncryptor(),
> CryptoStreamMode.Write);
>
>    while ((iRead = a.Read(encBuffer, 0, encBuffer.Length)) > 0)
>    {
>        iTally += iRead;
>        encStream.Write(encBuffer, 0, iTally);
>    }
>
>    return iTally;
> }
>
> I decrypt like so:
>
> public int Decrypt(ref MemoryStream a, ref MemoryStream b)
> {
>            byte[] k = { };
>            byte[] i = { };
>            byte[] encBuffer = new byte[a.Length + 10];
>            int iRead = 0, iTally = 0;
>
>            try
>            {
>                TripleDESCryptoServiceProvider tdes = new
> TripleDESCryptoServiceProvider();
>                CryptoStream decStream = new CryptoStream(b,
> tdes.CreateDecryptor(k, i), CryptoStreamMode.Write);
>
>                while ((iRead = a.Read(encBuffer, iTally, (int)a.Length -
> iRead)) > 0)
>                {
>                    iTally += iRead;
>                    decStream.Write(encBuffer, 0, iRead);
>                }
>
>            }
>            catch (Exception ex)
>            {
>                Console.WriteLine("ERROR...bytes read:  {0}", iRead);
>            }
>
>            return iTally;
> }
>
> Any thoughts?
>

"Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
news:O$Rh3d5vFHA.1032@TK2MSFTNGP12.phx.gbl...
>I have been doing heavy debugging, as I must get this code working, and
>I've found what I believe is a problem with the CryptoStream object.  I'm
>creating the MemoryStream with a byte[] backing containing 35 bytes.  After
>my encStream.Write call, the _position value (member of the underlying
>MemoryStream class) is 32, not 35 as I would expect.  When I look into the
>CryptoStream object, I see that the _InputBufferSize member is 3, which is
>the number of bytes "missing" when the loop ends.  somehow, the final three
>bytes are not being written in the Write call.  Now, I have tried using
>Flush(), but those three bytes don't get written.  If I attempt to do a
>FlushFinalBlock, I get an error:  memory stream is not expandable.
>
> None of this makes any sense (it should be working!), and I'm beating my
> head against the wall over the situation.  Any help would be greatly
> appreciated.
>
> Tim
>
> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
> news:eEQCGgsvFHA.1132@TK2MSFTNGP10.phx.gbl...
>> I'm experiencing something that I am not certain is normal or a problem.
>> I have a byte array that, once run through a method that encrypts using
>> Triple DES, the array now "appears" to be truncated.  By this I mean that
>> the final three bytes are now showing 0 (zero) in the debugger.  When I
>> decrypt, the string is now missing characters.
>>
>> I encrypt like this (no, that is not the actual method name.  yes, I have
>> this hardcoded for testing only and have omitted the key and iv array
>> values in this sample) :
>>
>> public int Encrypt(ref MemoryStream a, ref MemoryStream b)
>> {
>>    // the memory streams have a byte[] as the backing source
>>    byte[] k = {  };
>>    byte[] i = { };
>>    byte[] encBuffer = new byte[a.Length];
>>    int iRead = 0, iTally = 0;
>>
>>    TripleDESCryptoServiceProvider tdes = new
>> TripleDESCryptoServiceProvider();
>>    tdes.Key = k;
>>    tdes.IV = i;
>>    CryptoStream encStream = new CryptoStream(b, tdes.CreateEncryptor(),
>> CryptoStreamMode.Write);
>>
>>    while ((iRead = a.Read(encBuffer, 0, encBuffer.Length)) > 0)
>>    {
>>        iTally += iRead;
>>        encStream.Write(encBuffer, 0, iTally);
>>    }
>>
>>    return iTally;
>> }
>>
>> I decrypt like so:
>>
>> public int Decrypt(ref MemoryStream a, ref MemoryStream b)
>> {
>>            byte[] k = { };
>>            byte[] i = { };
>>            byte[] encBuffer = new byte[a.Length + 10];
>>            int iRead = 0, iTally = 0;
>>
>>            try
>>            {
>>                TripleDESCryptoServiceProvider tdes = new
>> TripleDESCryptoServiceProvider();
>>                CryptoStream decStream = new CryptoStream(b,
>> tdes.CreateDecryptor(k, i), CryptoStreamMode.Write);
>>
>>                while ((iRead = a.Read(encBuffer, iTally, (int)a.Length -
>> iRead)) > 0)
>>                {
>>                    iTally += iRead;
>>                    decStream.Write(encBuffer, 0, iRead);
>>                }
>>
>>            }
>>            catch (Exception ex)
>>            {
>>                Console.WriteLine("ERROR...bytes read:  {0}", iRead);
>>            }
>>
>>            return iTally;
>> }
>>
>> Any thoughts?
>>
>
>

"Joe Kaplan (MVP - ADSI)" <joseph.e.kap***@removethis.accenture.com> wrote
in message news:%23WfnPu5vFHA.908@tk2msftngp13.phx.gbl...
> Have you read Ivan's sample code and discussion on symmetric encryption?
> He has a pretty good "canonical" sample.
>
> http://www.dotnetthis.com/Articles/Crypto.htm
>
> Joe K.
>
> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
> news:O$Rh3d5vFHA.1032@TK2MSFTNGP12.phx.gbl...
>>I have been doing heavy debugging, as I must get this code working, and
>>I've found what I believe is a problem with the CryptoStream object.  I'm
>>creating the MemoryStream with a byte[] backing containing 35 bytes.
>>After my encStream.Write call, the _position value (member of the
>>underlying MemoryStream class) is 32, not 35 as I would expect.  When I
>>look into the CryptoStream object, I see that the _InputBufferSize member
>>is 3, which is the number of bytes "missing" when the loop ends.  somehow,
>>the final three bytes are not being written in the Write call.  Now, I
>>have tried using Flush(), but those three bytes don't get written.  If I
>>attempt to do a FlushFinalBlock, I get an error:  memory stream is not
>>expandable.
>>
>> None of this makes any sense (it should be working!), and I'm beating my
>> head against the wall over the situation.  Any help would be greatly
>> appreciated.
>>
>> Tim
>>
>> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in
>> message news:eEQCGgsvFHA.1132@TK2MSFTNGP10.phx.gbl...
>>> I'm experiencing something that I am not certain is normal or a problem.
>>> I have a byte array that, once run through a method that encrypts using
>>> Triple DES, the array now "appears" to be truncated.  By this I mean
>>> that the final three bytes are now showing 0 (zero) in the debugger.
>>> When I decrypt, the string is now missing characters.
>>>
>>> I encrypt like this (no, that is not the actual method name.  yes, I
>>> have this hardcoded for testing only and have omitted the key and iv
>>> array values in this sample) :
>>>
>>> public int Encrypt(ref MemoryStream a, ref MemoryStream b)
>>> {
>>>    // the memory streams have a byte[] as the backing source
>>>    byte[] k = {  };
>>>    byte[] i = { };
>>>    byte[] encBuffer = new byte[a.Length];
>>>    int iRead = 0, iTally = 0;
>>>
>>>    TripleDESCryptoServiceProvider tdes = new
>>> TripleDESCryptoServiceProvider();
>>>    tdes.Key = k;
>>>    tdes.IV = i;
>>>    CryptoStream encStream = new CryptoStream(b, tdes.CreateEncryptor(),
>>> CryptoStreamMode.Write);
>>>
>>>    while ((iRead = a.Read(encBuffer, 0, encBuffer.Length)) > 0)
>>>    {
>>>        iTally += iRead;
>>>        encStream.Write(encBuffer, 0, iTally);
>>>    }
>>>
>>>    return iTally;
>>> }
>>>
>>> I decrypt like so:
>>>
>>> public int Decrypt(ref MemoryStream a, ref MemoryStream b)
>>> {
>>>            byte[] k = { };
>>>            byte[] i = { };
>>>            byte[] encBuffer = new byte[a.Length + 10];
>>>            int iRead = 0, iTally = 0;
>>>
>>>            try
>>>            {
>>>                TripleDESCryptoServiceProvider tdes = new
>>> TripleDESCryptoServiceProvider();
>>>                CryptoStream decStream = new CryptoStream(b,
>>> tdes.CreateDecryptor(k, i), CryptoStreamMode.Write);
>>>
>>>                while ((iRead = a.Read(encBuffer, iTally, (int)a.Length -
>>> iRead)) > 0)
>>>                {
>>>                    iTally += iRead;
>>>                    decStream.Write(encBuffer, 0, iRead);
>>>                }
>>>
>>>            }
>>>            catch (Exception ex)
>>>            {
>>>                Console.WriteLine("ERROR...bytes read:  {0}", iRead);
>>>            }
>>>
>>>            return iTally;
>>> }
>>>
>>> Any thoughts?
>>>
>>
>>
>
>

"Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
news:uUS5wj6vFHA.664@tk2msftngp13.phx.gbl...
> Joe:
>
> Thanks for the link.  I changed my code to work exactly like Joe's sample,
> but when the decrypting is completed, instead of the 35 bytes initially in
> the byte array transmitted, I'm left with 24.  Furthermore, when I try to
> close the CryptoStream, I still get the "not expandable" error.
>
> Any other ideas?
>
> Tim
>
> "Joe Kaplan (MVP - ADSI)" <joseph.e.kap***@removethis.accenture.com> wrote
> in message news:%23WfnPu5vFHA.908@tk2msftngp13.phx.gbl...
>> Have you read Ivan's sample code and discussion on symmetric encryption?
>> He has a pretty good "canonical" sample.
>>
>> http://www.dotnetthis.com/Articles/Crypto.htm
>>
>> Joe K.
>>
>> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in
>> message news:O$Rh3d5vFHA.1032@TK2MSFTNGP12.phx.gbl...
>>>I have been doing heavy debugging, as I must get this code working, and
>>>I've found what I believe is a problem with the CryptoStream object.  I'm
>>>creating the MemoryStream with a byte[] backing containing 35 bytes.
>>>After my encStream.Write call, the _position value (member of the
>>>underlying MemoryStream class) is 32, not 35 as I would expect.  When I
>>>look into the CryptoStream object, I see that the _InputBufferSize member
>>>is 3, which is the number of bytes "missing" when the loop ends.
>>>somehow, the final three bytes are not being written in the Write call.
>>>Now, I have tried using Flush(), but those three bytes don't get written.
>>>If I attempt to do a FlushFinalBlock, I get an error:  memory stream is
>>>not expandable.
>>>
>>> None of this makes any sense (it should be working!), and I'm beating my
>>> head against the wall over the situation.  Any help would be greatly
>>> appreciated.
>>>
>>> Tim
>>>
>>> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in
>>> message news:eEQCGgsvFHA.1132@TK2MSFTNGP10.phx.gbl...
>>>> I'm experiencing something that I am not certain is normal or a
>>>> problem. I have a byte array that, once run through a method that
>>>> encrypts using Triple DES, the array now "appears" to be truncated.  By
>>>> this I mean that the final three bytes are now showing 0 (zero) in the
>>>> debugger. When I decrypt, the string is now missing characters.
>>>>
>>>> I encrypt like this (no, that is not the actual method name.  yes, I
>>>> have this hardcoded for testing only and have omitted the key and iv
>>>> array values in this sample) :
>>>>
>>>> public int Encrypt(ref MemoryStream a, ref MemoryStream b)
>>>> {
>>>>    // the memory streams have a byte[] as the backing source
>>>>    byte[] k = {  };
>>>>    byte[] i = { };
>>>>    byte[] encBuffer = new byte[a.Length];
>>>>    int iRead = 0, iTally = 0;
>>>>
>>>>    TripleDESCryptoServiceProvider tdes = new
>>>> TripleDESCryptoServiceProvider();
>>>>    tdes.Key = k;
>>>>    tdes.IV = i;
>>>>    CryptoStream encStream = new CryptoStream(b, tdes.CreateEncryptor(),
>>>> CryptoStreamMode.Write);
>>>>
>>>>    while ((iRead = a.Read(encBuffer, 0, encBuffer.Length)) > 0)
>>>>    {
>>>>        iTally += iRead;
>>>>        encStream.Write(encBuffer, 0, iTally);
>>>>    }
>>>>
>>>>    return iTally;
>>>> }
>>>>
>>>> I decrypt like so:
>>>>
>>>> public int Decrypt(ref MemoryStream a, ref MemoryStream b)
>>>> {
>>>>            byte[] k = { };
>>>>            byte[] i = { };
>>>>            byte[] encBuffer = new byte[a.Length + 10];
>>>>            int iRead = 0, iTally = 0;
>>>>
>>>>            try
>>>>            {
>>>>                TripleDESCryptoServiceProvider tdes = new
>>>> TripleDESCryptoServiceProvider();
>>>>                CryptoStream decStream = new CryptoStream(b,
>>>> tdes.CreateDecryptor(k, i), CryptoStreamMode.Write);
>>>>
>>>>                while ((iRead = a.Read(encBuffer, iTally,
>>>> (int)a.Length - iRead)) > 0)
>>>>                {
>>>>                    iTally += iRead;
>>>>                    decStream.Write(encBuffer, 0, iRead);
>>>>                }
>>>>
>>>>            }
>>>>            catch (Exception ex)
>>>>            {
>>>>                Console.WriteLine("ERROR...bytes read:  {0}", iRead);
>>>>            }
>>>>
>>>>            return iTally;
>>>> }
>>>>
>>>> Any thoughts?
>>>>
>>>
>>>
>>
>>
>
>

"William Stacey [MVP]" <stac***@mvps.org> wrote in message
news:%236Ng4R7vFHA.2064@TK2MSFTNGP09.phx.gbl...
>I do it this way.  Another neat thing is the same EncryptBytes and
>DecryptBytes methods will work with 3Des and Rijndael unchanged.  Just pass
>the respective ICryptoTransform you need.
>
> // Use the methods Sample:
>            TripleDESCryptoServiceProvider td = new
> TripleDESCryptoServiceProvider();
>            // Set td key and iv here.
>            string clearString = "This string will be encrypted.";
>            byte[] clearData = Encoding.UTF8.GetBytes(clearString);
>            byte[] encData = Utils.EncryptBytes(td.CreateEncryptor(),
> clearData);
>            clearData = Utils.DecryptBytes(td.CreateDecryptor(), encData);
>            clearString = Encoding.UTF8.GetString(clearData);
>            Console.WriteLine(clearString);
>
> // Put these static methods in a Utils class or something.
>  public static byte[] EncryptBytes(ICryptoTransform encryptor, byte[]
> data)
>  {
>              if ( encryptor == null )
>    throw new ArgumentNullException("encryptor");
>   if ( data == null )
>    throw new ArgumentNullException("data");
>
>   using(MemoryStream msEncrypt = new MemoryStream())
>   using(CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor,
> CryptoStreamMode.Write))
>   {
>    csEncrypt.Write(data, 0, data.Length);
>    csEncrypt.FlushFinalBlock();
>    byte[] encrypted = msEncrypt.ToArray();
>    return encrypted;
>   }
>  }
>
>  public static byte[] DecryptBytes(ICryptoTransform decryptor, byte[]
> encrypted)
>  {
>   if ( decryptor == null )
>    throw new ArgumentNullException("decryptor");
>   if ( encrypted == null )
>    throw new ArgumentNullException("encrypted");
>
>   using(MemoryStream msDecrypt = new MemoryStream(encrypted))
>   using(CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor,
> CryptoStreamMode.Read))
>   {
>    byte[] fromEncrypt = new byte[encrypted.Length];
>    int read = csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
>    if ( read < fromEncrypt.Length )
>    {
>     byte[] clearBytes = new byte[read];
>     Buffer.BlockCopy(fromEncrypt, 0, clearBytes, 0, read);
>     return clearBytes;
>    }
>    return fromEncrypt;
>   }
>  }
>
> --
> William Stacey [MVP]
>
> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in message
> news:uUS5wj6vFHA.664@tk2msftngp13.phx.gbl...
>> Joe:
>>
>> Thanks for the link.  I changed my code to work exactly like Joe's
>> sample, but when the decrypting is completed, instead of the 35 bytes
>> initially in the byte array transmitted, I'm left with 24.  Furthermore,
>> when I try to close the CryptoStream, I still get the "not expandable"
>> error.
>>
>> Any other ideas?
>>
>> Tim
>>
>> "Joe Kaplan (MVP - ADSI)" <joseph.e.kap***@removethis.accenture.com>
>> wrote in message news:%23WfnPu5vFHA.908@tk2msftngp13.phx.gbl...
>>> Have you read Ivan's sample code and discussion on symmetric encryption?
>>> He has a pretty good "canonical" sample.
>>>
>>> http://www.dotnetthis.com/Articles/Crypto.htm
>>>
>>> Joe K.
>>>
>>> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in
>>> message news:O$Rh3d5vFHA.1032@TK2MSFTNGP12.phx.gbl...
>>>>I have been doing heavy debugging, as I must get this code working, and
>>>>I've found what I believe is a problem with the CryptoStream object.
>>>>I'm creating the MemoryStream with a byte[] backing containing 35 bytes.
>>>>After my encStream.Write call, the _position value (member of the
>>>>underlying MemoryStream class) is 32, not 35 as I would expect.  When I
>>>>look into the CryptoStream object, I see that the _InputBufferSize
>>>>member is 3, which is the number of bytes "missing" when the loop ends.
>>>>somehow, the final three bytes are not being written in the Write call.
>>>>Now, I have tried using Flush(), but those three bytes don't get
>>>>written. If I attempt to do a FlushFinalBlock, I get an error:  memory
>>>>stream is not expandable.
>>>>
>>>> None of this makes any sense (it should be working!), and I'm beating
>>>> my head against the wall over the situation.  Any help would be greatly
>>>> appreciated.
>>>>
>>>> Tim
>>>>
>>>> "Tim Wallace" <twallace-ThisDoesNotBelong-AT-emailDOTcom> wrote in
>>>> message news:eEQCGgsvFHA.1132@TK2MSFTNGP10.phx.gbl...
>>>>> I'm experiencing something that I am not certain is normal or a
>>>>> problem. I have a byte array that, once run through a method that
>>>>> encrypts using Triple DES, the array now "appears" to be truncated.
>>>>> By this I mean that the final three bytes are now showing 0 (zero) in
>>>>> the debugger. When I decrypt, the string is now missing characters.
>>>>>
>>>>> I encrypt like this (no, that is not the actual method name.  yes, I
>>>>> have this hardcoded for testing only and have omitted the key and iv
>>>>> array values in this sample) :
>>>>>
>>>>> public int Encrypt(ref MemoryStream a, ref MemoryStream b)
>>>>> {
>>>>>    // the memory streams have a byte[] as the backing source
>>>>>    byte[] k = {  };
>>>>>    byte[] i = { };
>>>>>    byte[] encBuffer = new byte[a.Length];
>>>>>    int iRead = 0, iTally = 0;
>>>>>
>>>>>    TripleDESCryptoServiceProvider tdes = new
>>>>> TripleDESCryptoServiceProvider();
>>>>>    tdes.Key = k;
>>>>>    tdes.IV = i;
>>>>>    CryptoStream encStream = new CryptoStream(b,
>>>>> tdes.CreateEncryptor(), CryptoStreamMode.Write);
>>>>>
>>>>>    while ((iRead = a.Read(encBuffer, 0, encBuffer.Length)) > 0)
>>>>>    {
>>>>>        iTally += iRead;
>>>>>        encStream.Write(encBuffer, 0, iTally);
>>>>>    }
>>>>>
>>>>>    return iTally;
>>>>> }
>>>>>
>>>>> I decrypt like so:
>>>>>
>>>>> public int Decrypt(ref MemoryStream a, ref MemoryStream b)
>>>>> {
>>>>>            byte[] k = { };
>>>>>            byte[] i = { };
>>>>>            byte[] encBuffer = new byte[a.Length + 10];
>>>>>            int iRead = 0, iTally = 0;
>>>>>
>>>>>            try
>>>>>            {
>>>>>                TripleDESCryptoServiceProvider tdes = new
>>>>> TripleDESCryptoServiceProvider();
>>>>>                CryptoStream decStream = new CryptoStream(b,
>>>>> tdes.CreateDecryptor(k, i), CryptoStreamMode.Write);
>>>>>
>>>>>                while ((iRead = a.Read(encBuffer, iTally,
>>>>> (int)a.Length - iRead)) > 0)
>>>>>                {
>>>>>                    iTally += iRead;
>>>>>                    decStream.Write(encBuffer, 0, iRead);
>>>>>                }
>>>>>
>>>>>            }
>>>>>            catch (Exception ex)
>>>>>            {
>>>>>                Console.WriteLine("ERROR...bytes read:  {0}", iRead);
>>>>>            }
>>>>>
>>>>>            return iTally;
>>>>> }
>>>>>
>>>>> Any thoughts?
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>