static void
mppe_key_change(mppe *_mppe, mppe_rc4_t *_this)
{
u_char interim[16];
void *keychg;
keychg = rc4_create_ctx();
GetNewKeyFromSHA(_this->master_key, _this->session_key,
_this->keylen, interim);
rc4_key(keychg, _this->keylen, interim);
rc4(keychg, _this->keylen, interim, _this->session_key);
mppe_reduce_key(_this);
if (_this->old_session_keys) {
int idx = _this->coher_cnt % MPPE_NOLDKEY;
memcpy(_this->old_session_keys[idx],
_this->session_key, MPPE_KEYLEN);
}
free(keychg);
}
SECURITY_STATUS
SspMapContext(
IN PCtxtHandle phContext,
IN PUCHAR pSessionKey,
IN ULONG NegotiateFlags,
IN HANDLE TokenHandle,
IN LPWSTR ContextNames,
IN PTimeStamp PasswordExpiry OPTIONAL
)
/*++
RoutineDescription:
Create a local context for a real context
Arguments:
Return Value:
--*/
{
SECURITY_STATUS scRet = SEC_E_OK;
PCheaterContext pContext;
pContext = SspAddLocalContext(
phContext,
pSessionKey,
NegotiateFlags,
TokenHandle,
ContextNames );
if (pContext)
{
if (ARGUMENT_PRESENT(PasswordExpiry))
{
pContext->PasswordExpiry = *PasswordExpiry;
}
else
{
pContext->PasswordExpiry.QuadPart = 0;
}
pContext->Nonce = 0;
#ifndef EXPORT_BUILD
if ((NegotiateFlags & NTLMSSP_NEGOTIATE_STRONG_CRYPT) != 0) {
rc4_key(&pContext->Rc4Key, MSV1_0_USER_SESSION_KEY_LENGTH, pContext->SessionKey);
} else
#endif
if (NegotiateFlags & NTLMSSP_NEGOTIATE_LM_KEY)
{
UCHAR Key[MSV1_0_LANMAN_SESSION_KEY_LENGTH];
ASSERT(MSV1_0_LANMAN_SESSION_KEY_LENGTH == 8);
RtlCopyMemory(Key,pContext->SessionKey,5);
//
// Put a well-known salt at the end of the key to
// limit the changing part to 40 bits.
//
Key[5] = 0xe5;
Key[6] = 0x38;
Key[7] = 0xb0;
rc4_key(&pContext->Rc4Key, MSV1_0_LANMAN_SESSION_KEY_LENGTH, Key);
} else {
rc4_key(&pContext->Rc4Key, MSV1_0_USER_SESSION_KEY_LENGTH, pContext->SessionKey);
}
}
else scRet = SEC_E_INVALID_HANDLE;
return(scRet);
}
static int
mppe_rc4_setoldkey(mppe *_mppe, mppe_rc4_t *_this, uint16_t coher_cnt)
{
return rc4_key(_this->rc4ctx, _this->keylen,
_this->old_session_keys[coher_cnt % MPPE_NOLDKEY]);
}
static int
mppe_rc4_setkey(mppe *_mppe, mppe_rc4_t *_this)
{
return rc4_key(_this->rc4ctx, _this->keylen, _this->session_key);
}
int _cdecl main(int argc, char **argv)
{
struct RC4_KEYSTRUCT KeyContext;
BYTE Buffer[sizeof(Plaintext)];
printf("=================== RC4 Unit Test ==================\n");
//
// Test Key-Scheduling Algorithm (KSA)
//
printf("Key-Scheduling Algorithm (KSA) ...\t\t");
rc4_key(&KeyContext, sizeof(Key), Key);
#if 0
// ==
printf("\n");
for (i = 0; i < 256; i++)
{
printf("0x%02X, ", KeyContext.S[i]);
if ((i + 1) % 8 == 0) printf("\n");
}
printf("\n");
// ==
#endif
if (memcmp(KeyContext.S, KeystreamResult, sizeof(KeystreamResult)) != 0)
{
printf("FAIL\n");
return 1;
}
else
printf("SUCC\n");
//
// Test Pseudo-Random Generation Algorithm (PRGA)
//
printf("Pseudo-Random Generation Algorithm (PRGA) ...\t");
memcpy(Buffer, Plaintext, sizeof(Plaintext));
rc4(&KeyContext, sizeof(Buffer), Buffer);
#if 0
// ==
printf("\n");
for (i = 0; i < sizeof(Buffer); i++)
{
printf("0x%02X, ", Buffer[i]);
if ((i + 1) % 8 == 0) printf("\n");
}
printf("\n");
// ==
#endif
if (memcmp(Buffer, CiphertextResult, sizeof(CiphertextResult)) != 0)
{
printf("FAIL\n");
return 1;
}
else
printf("SUCC\n");
printf("====================================================\n");
return 0;
}