uint32_t SecretKey::release()
{
uint32_t cRefs = ASMAtomicDecU32(&m_cRefs);
if (!cRefs)
{
int rc = RTMemSaferScramble(m_pbKey, m_cbKey);
AssertRC(rc);
}
return cRefs;
}
SecretKey::SecretKey(const uint8_t *pbKey, size_t cbKey, bool fKeyBufNonPageable)
{
m_cRefs = 0;
m_fRemoveOnSuspend = false;
m_cUsers = 0;
m_cbKey = cbKey;
int rc = RTMemSaferAllocZEx((void **)&this->m_pbKey, cbKey,
fKeyBufNonPageable ? RTMEMSAFER_F_REQUIRE_NOT_PAGABLE : 0);
if (RT_SUCCESS(rc))
{
memcpy(this->m_pbKey, pbKey, cbKey);
/* Scramble content to make retrieving the key more difficult. */
rc = RTMemSaferScramble(this->m_pbKey, cbKey);
}
else
throw rc;
}
static void doMemSaferScramble(RTTEST hTest, void *pvBuf, size_t cbAlloc)
{
/*
* Fill it with random bytes and make a reference copy of these.
*/
RTRandBytes(pvBuf, cbAlloc);
void *pvRef = RTMemDup(pvBuf, cbAlloc);
RTTESTI_CHECK_RETV(pvRef);
/*
* Scramble the allocation and check that it no longer matches the refernece bytes.
*/
int rc = RTMemSaferScramble(pvBuf, cbAlloc);
if (RT_SUCCESS(rc))
{
if (!memcmp(pvRef, pvBuf, cbAlloc))
RTTestIFailed("Memory blocks must differ (%z bytes, 0x%p vs. 0x%p)!\n",
cbAlloc, pvRef, pvBuf);
else
{
/*
* Check that unscrambling returns the original content.
*/
rc = RTMemSaferUnscramble(pvBuf, cbAlloc);
if (RT_SUCCESS(rc))
{
if (memcmp(pvRef, pvBuf, cbAlloc))
RTTestIFailed("Memory blocks must not differ (%z bytes, 0x%p vs. 0x%p)!\n",
cbAlloc, pvRef, pvBuf);
}
else
RTTestIFailed("Unscrambling %z bytes failed with %Rrc!\n", cbAlloc, rc);
}
}
else
RTTestIFailed("Scrambling %z bytes failed with %Rrc!\n", cbAlloc, rc);
RTMemFree(pvRef);
}
