bool SrtpSymCrypto::setNewKey(const uint8_t* k, int32_t keyLength) {
// release an existing key before setting a new one
if (key != NULL)
delete[] (uint8_t*)key;
if (!(keyLength == 16 || keyLength == 32)) {
return false;
}
if (algorithm == SrtpEncryptionAESCM || algorithm == SrtpEncryptionAESF8) {
key = new uint8_t[sizeof(AES_KEY)];
memset(key, 0, sizeof(AES_KEY) );
AES_set_encrypt_key(k, keyLength*8, (AES_KEY *)key);
}
else if (algorithm == SrtpEncryptionTWOCM || algorithm == SrtpEncryptionTWOF8) {
if (!twoFishInit) {
Twofish_initialise();
twoFishInit = 1;
}
key = new uint8_t[sizeof(Twofish_key)];
memset(key, 0, sizeof(Twofish_key));
Twofish_prepare_key((Twofish_Byte*)k, keyLength, (Twofish_key*)key);
}
else
return false;
return true;
}
bool CTwofish::init(RD_UINT8 *pKey, unsigned long uKeyLen, RD_UINT8 *initVector)
{
ASSERT(pKey != NULL);
if(pKey == NULL) return false;
ASSERT(uKeyLen != 0);
if(uKeyLen == 0) return false;
if(g_bInitialized == false)
{
Twofish_initialise();
g_bInitialized = true;
}
Twofish_prepare_key((Twofish_Byte *)pKey, uKeyLen, &m_key);
if(initVector != NULL) memcpy(m_pInitVector, initVector, 16);
else memset(m_pInitVector, 0, 16);
return true;
}