encryption and decryption

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  • Start date Start date
G

Guest

I got the error of "Bad Data" when decrypting in PPC side, please help
thanks a lot!!!
the bytes are encrypted in desktop --->

byte[] writeBuffer = new byte[1024];
System.Text.ASCIIEncoding encode = new ASCIIEncoding ();
writeBuffer = encode.GetBytes(mServerMsg);
//encrypt the bytes to be sent
writeBuffer = Crypto.Encrypt (writeBuffer);
sock.send(writeBuffer);

private DES encryptAlg = new DESCryptoServiceProvider();
private static string pwd = "012345678901234567890";
private PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwd,
new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
encryptAlg.Key = pdb.GetBytes (8);
encryptAlg.IV = pdb.GetBytes (8);

public byte[] Encrypt(byte[] inputByteArray)
{
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, encryptAlg.CreateEncryptor(),
CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return ms.ToArray ();
}
------------------------------------
PPC client decrypts -->

int rcount = sock.Receive(receiveByte,receiveByte.Length,0) ;
//decrypt the bytes received
receiveByte = cCryptoCls.Decrypt (receiveByte);
System.Text.ASCIIEncoding encode = new ASCIIEncoding ();
message = encode.GetString(receiveByte,0,receiveByte.Length ) ;
message = message.Substring(0,rcount);

private DES encryptAlg = new DESCryptoServiceProvider();
private static string pwd = "012345678901234567890";
private PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwd,
new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
encryptAlg.Key = pdb.GetBytes (8);
encryptAlg.IV = pdb.GetBytes (8);
public byte[] Encrypt(byte[] input)
{
return encryptAlg.EncryptValue(input);
}
public byte[] Decrypt(byte[] input)
{
return encryptAlg.DecryptValue(input);
}
 
i can decrypt in the client side now
but the problem is that
server sends "apple"
but client decrypts like this " !!@#$ ple"

the byte length is the same in both side
what is the problem?

thanks a lot!!
 
Hi Alan, could you please try to receive that data on a desktop application
and tell me what happen? Do you get the same message or is it able to
decrypt the information properly?

Thx
Fernando
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--------------------
| Thread-Topic: encryption and decryption
| thread-index: AcULkzr9ZH0yQ34LR/CoI4SveC94dw==
| X-WBNR-Posting-Host: 203.218.158.29
| From: "=?Utf-8?B?YWxhbg==?=" <[email protected]>
| Subject: encryption and decryption
| Date: Sat, 5 Feb 2005 06:59:02 -0800
| Lines: 55
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microsoft.public.dotnet.framework.compactframework:70580
| X-Tomcat-NG: microsoft.public.dotnet.framework.compactframework
|
| I got the error of "Bad Data" when decrypting in PPC side, please help
| thanks a lot!!!
| the bytes are encrypted in desktop --->
|
| byte[] writeBuffer = new byte[1024];
| System.Text.ASCIIEncoding encode = new ASCIIEncoding ();
| writeBuffer = encode.GetBytes(mServerMsg);
| //encrypt the bytes to be sent
| writeBuffer = Crypto.Encrypt (writeBuffer);
| sock.send(writeBuffer);
|
| private DES encryptAlg = new DESCryptoServiceProvider();
| private static string pwd = "012345678901234567890";
| private PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwd,
| new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
| 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
| encryptAlg.Key = pdb.GetBytes (8);
| encryptAlg.IV = pdb.GetBytes (8);
|
| public byte[] Encrypt(byte[] inputByteArray)
| {
| MemoryStream ms = new MemoryStream();
| CryptoStream cs = new CryptoStream(ms, encryptAlg.CreateEncryptor(),
| CryptoStreamMode.Write);
| cs.Write(inputByteArray, 0, inputByteArray.Length);
| cs.FlushFinalBlock();
| return ms.ToArray ();
| }
| ------------------------------------
| PPC client decrypts -->
|
| int rcount = sock.Receive(receiveByte,receiveByte.Length,0) ;
| //decrypt the bytes received
| receiveByte = cCryptoCls.Decrypt (receiveByte);
| System.Text.ASCIIEncoding encode = new ASCIIEncoding ();
| message = encode.GetString(receiveByte,0,receiveByte.Length ) ;
| message = message.Substring(0,rcount);
|
| private DES encryptAlg = new DESCryptoServiceProvider();
| private static string pwd = "012345678901234567890";
| private PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwd,
| new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
| 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
| encryptAlg.Key = pdb.GetBytes (8);
| encryptAlg.IV = pdb.GetBytes (8);
| public byte[] Encrypt(byte[] input)
| {
| return encryptAlg.EncryptValue(input);
| }
| public byte[] Decrypt(byte[] input)
| {
| return encryptAlg.DecryptValue(input);
| }
|
|
|
 
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