public static byte[] WhatsappEncrypt(byte[] key, byte[] data, bool appendHash)
{
if (encryptionOutgoing == null)
{
encryptionOutgoing = new RC4(key, 256);
}
HMACSHA1 h = new HMACSHA1(key);
byte[] buff = new byte[data.Length];
Buffer.BlockCopy(data, 0, buff, 0, data.Length);
encryptionOutgoing.Cipher(buff);
byte[] hashByte = h.ComputeHash(buff);
byte[] response = new byte[4 + buff.Length];
if (appendHash)
{
Buffer.BlockCopy(buff, 0, response, 0, buff.Length);
Buffer.BlockCopy(hashByte, 0, response, buff.Length, 4);
}
else
{
Buffer.BlockCopy(hashByte, 0, response, 0, 4);
Buffer.BlockCopy(buff, 0, response, 4, buff.Length);
}
return(response);
}
public static byte[] WhatsappDecrypt(byte[] key, byte[] data)
{
if (encryptionIncoming == null)
{
encryptionIncoming = new RC4(key, 256);
}
byte[] buff = new byte[data.Length];
Buffer.BlockCopy(data, 0, buff, 0, data.Length);
encryptionIncoming.Cipher(buff);
return(buff);
}
public KeyStream(byte[] key, byte[] macKey)
{
this.rc4 = new RC4(key, 768);
this.mac = new HMACSHA1(macKey);
}