static PRStatus
rng_init(void)
{
PRUint8 bytes[PRNG_SEEDLEN * 2]; /* entropy + nonce */
unsigned int numBytes;
SECStatus rv = SECSuccess;
if (globalrng == NULL) {
/* bytes needs to have enough space to hold
* a SHA256 hash value. Blow up at compile time if this isn't true */
PR_STATIC_ASSERT(sizeof(bytes) >= SHA256_LENGTH);
/* create a new global RNG context */
globalrng = &theGlobalRng;
PORT_Assert(NULL == globalrng->lock);
/* create a lock for it */
globalrng->lock = PZ_NewLock(nssILockOther);
if (globalrng->lock == NULL) {
globalrng = NULL;
PORT_SetError(PR_OUT_OF_MEMORY_ERROR);
return PR_FAILURE;
}
/* Try to get some seed data for the RNG */
numBytes = (unsigned int)RNG_SystemRNG(bytes, sizeof bytes);
PORT_Assert(numBytes == 0 || numBytes == sizeof bytes);
if (numBytes != 0) {
/* if this is our first call, instantiate, otherwise reseed
* prng_instantiate gets a new clean state, we want to mix
* any previous entropy we may have collected */
if (V(globalrng)[0] == 0) {
rv = prng_instantiate(globalrng, bytes, numBytes);
} else {
rv = prng_reseed_test(globalrng, bytes, numBytes, NULL, 0);
}
memset(bytes, 0, numBytes);
} else {
PZ_DestroyLock(globalrng->lock);
globalrng->lock = NULL;
globalrng = NULL;
return PR_FAILURE;
}
if (rv != SECSuccess) {
return PR_FAILURE;
}
/* the RNG is in a valid state */
globalrng->isValid = PR_TRUE;
globalrng->isKatTest = PR_FALSE;
/* fetch one random value so that we can populate rng->oldV for our
* continous random number test. */
prng_generateNewBytes(globalrng, bytes, SHA256_LENGTH, NULL, 0);
/* Fetch more entropy into the PRNG */
RNG_SystemInfoForRNG();
}
return PR_SUCCESS;
}
/*
* Test vector API. Use NIST SP 800-90 general interface so one of the
* other NIST SP 800-90 algorithms may be used in the future.
*/
SECStatus
PRNGTEST_Instantiate(const PRUint8 *entropy, unsigned int entropy_len,
const PRUint8 *nonce, unsigned int nonce_len,
const PRUint8 *personal_string, unsigned int ps_len)
{
int bytes_len = entropy_len + nonce_len + ps_len;
PRUint8 *bytes = NULL;
SECStatus rv;
if (entropy_len < 256/PR_BITS_PER_BYTE) {
PORT_SetError(SEC_ERROR_NEED_RANDOM);
return SECFailure;
}
bytes = PORT_Alloc(bytes_len);
if (bytes == NULL) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
return SECFailure;
}
/* concatenate the various inputs, internally NSS only instantiates with
* a single long string */
PORT_Memcpy(bytes, entropy, entropy_len);
if (nonce) {
PORT_Memcpy(&bytes[entropy_len], nonce, nonce_len);
} else {
PORT_Assert(nonce_len == 0);
}
if (personal_string) {
PORT_Memcpy(&bytes[entropy_len+nonce_len], personal_string, ps_len);
} else {
PORT_Assert(ps_len == 0);
}
rv = prng_instantiate(&testContext, bytes, bytes_len);
PORT_ZFree(bytes, bytes_len);
if (rv == SECFailure) {
return SECFailure;
}
testContext.isValid = PR_TRUE;
return SECSuccess;
}
