[Gingin]

Here's the XTEA functions in C#, in case someone needs them. For third party developers, you'll have to read they key from the clients memory.

Code

public unsafe static bool XteaEncrypt(ref byte[] buffer, ref int length, int index, uint[] key)
  {
    if (key == null)
    return false;

    int msgSize = length - index;

    int pad = msgSize % 8;
    if (pad > 0)
    {
    msgSize += (8 - pad);
    length = index + msgSize;
    }

    fixed (byte* bufferPtr = buffer)
    {
    uint* words = (uint*)(bufferPtr + index);

    for (int pos = 0; pos < msgSize / 4; pos += 2)
    {
    uint x_sum = 0, x_delta = 0x9e3779b9, x_count = 32;

    while (x_count-- > 0)
    {
    words[pos] += (words[pos+1] << 4 ^ words[pos+1] >> 5) + words[pos+1] ^ x_sum
    + key[x_sum & 3];
    x_sum += x_delta;
    words[pos+1] += (words[pos] << 4 ^ words[pos] >> 5) + words[pos] ^ x_sum
    + key[x_sum >> 11 & 3];
    }
    }
    }

    return true;
  }

  public unsafe static bool XteaDecrypt(ref byte[] buffer, ref int length, int index, uint[] key)
  {
    if (length <= index || (length - index) % 8 > 0 || key == null)
    return false;

    fixed (byte* bufferPtr = buffer)
    {
    uint* words = (uint*)(bufferPtr + index);
    int msgSize = length - index;

    for (int pos = 0; pos < msgSize / 4; pos += 2)
    {
    uint x_count = 32, x_sum = 0xC6EF3720, x_delta = 0x9E3779B9;

    while (x_count-- > 0)
    {
    words[pos + 1] -= (words[pos] << 4 ^ words[pos] >> 5) + words[pos] ^ x_sum
    + key[x_sum >> 11 & 3];
    x_sum -= x_delta;
    words[pos] -= (words[pos + 1] << 4 ^ words[pos + 1] >> 5) + words[pos + 1] ^ x_sum
    + key[x_sum & 3];
    }
    }
    }
    length = (int)(BitConverter.ToUInt16(buffer, index) + 2 + index);
    return true;
  }

[d3v1l401]

dude,i fkin love you!
i was searching exactly for this!

[Marcusramse1]

Nice encryption :D I tried to make one once.. Faild.

[INFAМOUS]

Great share! thanks for this :D

[d3c0mpil3r]

No problem guys.
btwXXTEA Encryption (Click to View)https://hackforums.net/showthread.php?tid=993836

[felicixus]

Wonderful job. Great man. You are just great :)

[IsraX0r]

Very nice, I suggest you to make it polymorphic to make it even better.

[INFAМOUS]

im getting an error..

Code

Public Class Form1
    Dim xtea As XTea
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  xtea = New XTea(TextBox3.Text)
  TextBox2.Text = xtea.EncryptString(TextBox1.Text)
    End Sub

the error is...

Code

Error    1    'EncryptString' is not a member of 'XTea_Encryption.XTea'.

Any thoughts?

[d3c0mpil3r]

im getting an error..

Code

Public Class Form1
    Dim xtea As XTea
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  xtea = New XTea(TextBox3.Text)
  TextBox2.Text = xtea.EncryptString(TextBox1.Text)
    End Sub

the error is...

Code

Error    1    'EncryptString' is not a member of 'XTea_Encryption.XTea'.

Any thoughts?

Their is no method named 'EncryptString'. Read the source!
You call it like:

Code

Dim x as new XTea("password")
x.Encrypt("data_to_encrypt")

[0van]

Could you help me?
I have a file encrypted with XTEA and I have the key, but when I want to decrypt the file I ever get an Overflow Error :/

[Ethereal]

XTEA is TEA's precursor.

XTEA = Extended TEA, so its a subsequent version, not a precursor ^^

Aside from that, it looks okay. Above poster gravedug, by the way.

[Stenography]

Epic encryption..
Now trying how add this to my crypter and delete that gay detectable rc4.