static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx)
{
BN_BLINDING *ret;
int got_write_lock = 0;
CRYPTO_r_lock(CRYPTO_LOCK_RSA);
if (rsa->blinding == NULL)
{
CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
CRYPTO_w_lock(CRYPTO_LOCK_RSA);
got_write_lock = 1;
if (rsa->blinding == NULL)
rsa->blinding = RSA_setup_blinding(rsa, ctx);
}
ret = rsa->blinding;
if (ret == NULL)
goto err;
if (BN_BLINDING_get_thread_id(ret) == CRYPTO_thread_id())
{
/* rsa->blinding is ours! */
*local = 1;
}
else
{
/* resort to rsa->mt_blinding instead */
*local = 0; /* instructs rsa_blinding_convert(), rsa_blinding_invert()
* that the BN_BLINDING is shared, meaning that accesses
* require locks, and that the blinding factor must be
* stored outside the BN_BLINDING
*/
if (rsa->mt_blinding == NULL)
{
if (!got_write_lock)
{
CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
CRYPTO_w_lock(CRYPTO_LOCK_RSA);
got_write_lock = 1;
}
if (rsa->mt_blinding == NULL)
rsa->mt_blinding = RSA_setup_blinding(rsa, ctx);
}
ret = rsa->mt_blinding;
}
err:
if (got_write_lock)
CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
else
CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
return ret;
}
static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx)
{
BN_BLINDING *ret;
CRYPTO_THREAD_write_lock(rsa->lock);
if (rsa->blinding == NULL) {
rsa->blinding = RSA_setup_blinding(rsa, ctx);
}
ret = rsa->blinding;
if (ret == NULL)
goto err;
if (BN_BLINDING_is_current_thread(ret)) {
/* rsa->blinding is ours! */
*local = 1;
} else {
/* resort to rsa->mt_blinding instead */
/*
* instructs rsa_blinding_convert(), rsa_blinding_invert() that the
* BN_BLINDING is shared, meaning that accesses require locks, and
* that the blinding factor must be stored outside the BN_BLINDING
*/
*local = 0;
if (rsa->mt_blinding == NULL) {
rsa->mt_blinding = RSA_setup_blinding(rsa, ctx);
}
ret = rsa->mt_blinding;
}
err:
CRYPTO_THREAD_unlock(rsa->lock);
return ret;
}
static BN_BLINDING *rsa_get_blinding(RSA *rsa, BIGNUM **r, int *local, BN_CTX *ctx)
{
BN_BLINDING *ret;
if (rsa->blinding == NULL)
{
if (rsa->blinding == NULL)
{
CRYPTO_w_lock(CRYPTO_LOCK_RSA);
if (rsa->blinding == NULL)
rsa->blinding = RSA_setup_blinding(rsa, ctx);
CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
}
}
ret = rsa->blinding;
if (ret == NULL)
return NULL;
if (BN_BLINDING_get_thread_id(ret) != CRYPTO_thread_id())
{
*local = 0;
if (rsa->mt_blinding == NULL)
{
CRYPTO_w_lock(CRYPTO_LOCK_RSA);
if (rsa->mt_blinding == NULL)
rsa->mt_blinding = RSA_setup_blinding(rsa, ctx);
CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
}
ret = rsa->mt_blinding;
}
else
*local = 1;
return ret;
}
int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
{
int ret=0;
if (rsa->blinding != NULL)
RSA_blinding_off(rsa);
rsa->blinding = RSA_setup_blinding(rsa, ctx);
if (rsa->blinding == NULL)
goto err;
rsa->flags |= RSA_FLAG_BLINDING;
rsa->flags &= ~RSA_FLAG_NO_BLINDING;
ret=1;
err:
return(ret);
}
