private void InitCipher(ref IntPtr ctx, byte[] iv, bool isCipher)
{
ctx = Marshal.AllocHGlobal(_cipherInfo[3]);
byte[] realkey;
if (_method == "rc4-md5")
{
byte[] temp = new byte[keyLen + ivLen];
realkey = new byte[keyLen];
Array.Copy(_key, 0, temp, 0, keyLen);
Array.Copy(iv, 0, temp, keyLen, ivLen);
realkey = MD5.Create().ComputeHash(temp);
}
else
{
realkey = _key;
}
if (_cipher == CIPHER_AES)
{
PolarSSL.aes_init(ctx);
// PolarSSL takes key length by bit
// since we'll use CFB mode, here we both do enc, not dec
PolarSSL.aes_setkey_enc(ctx, realkey, keyLen * 8);
if (isCipher)
{
_encryptIV = new byte[ivLen];
Array.Copy(iv, _encryptIV, ivLen);
}
else
{
_decryptIV = new byte[ivLen];
Array.Copy(iv, _decryptIV, ivLen);
}
}
else if (_cipher == CIPHER_BF)
{
PolarSSL.blowfish_init(ctx);
// PolarSSL takes key length by bit
PolarSSL.blowfish_setkey(ctx, realkey, keyLen * 8);
if (isCipher)
{
_encryptIV = new byte[ivLen];
Array.Copy(iv, _encryptIV, ivLen);
}
else
{
_decryptIV = new byte[ivLen];
Array.Copy(iv, _decryptIV, ivLen);
}
}
else if (_cipher == CIPHER_RC4)
{
PolarSSL.arc4_init(ctx);
// PolarSSL RC4 takes key length by byte
PolarSSL.arc4_setup(ctx, realkey, keyLen);
}
}
protected override void initCipher(byte[] iv, bool isCipher)
{
base.initCipher(iv, isCipher);
IntPtr ctx;
ctx = Marshal.AllocHGlobal(_cipherInfo[3]);
if (isCipher)
{
_encryptCtx = ctx;
}
else
{
_decryptCtx = ctx;
}
byte[] realkey;
if (_method == "rc4-md5")
{
byte[] temp = new byte[keyLen + ivLen];
realkey = new byte[keyLen];
Array.Copy(_key, 0, temp, 0, keyLen);
Array.Copy(iv, 0, temp, keyLen, ivLen);
realkey = MD5.Create().ComputeHash(temp);
}
else
{
realkey = _key;
}
if (_cipher == CIPHER_AES)
{
PolarSSL.aes_init(ctx);
// PolarSSL takes key length by bit
// since we'll use CFB mode, here we both do enc, not dec
PolarSSL.aes_setkey_enc(ctx, realkey, keyLen * 8);
}
else if (_cipher == CIPHER_RC4)
{
PolarSSL.arc4_init(ctx);
// PolarSSL RC4 takes key length by byte
PolarSSL.arc4_setup(ctx, realkey, keyLen);
}
}