BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
{
BIGNUM *e;
BN_CTX *ctx;
BN_BLINDING *ret = NULL;
if (in_ctx == NULL) {
if ((ctx = BN_CTX_new()) == NULL)
return 0;
} else
ctx = in_ctx;
BN_CTX_start(ctx);
e = BN_CTX_get(ctx);
if (e == NULL) {
RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
goto err;
}
if (rsa->e == NULL) {
e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
if (e == NULL) {
RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
goto err;
}
} else
e = rsa->e;
{
BIGNUM *n = BN_new();
if (n == NULL) {
RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
goto err;
}
BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
rsa->_method_mod_n);
/* We MUST free n before any further use of rsa->n */
BN_free(n);
}
if (ret == NULL) {
RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
goto err;
}
BN_BLINDING_set_current_thread(ret);
err:
BN_CTX_end(ctx);
if (ctx != in_ctx)
BN_CTX_free(ctx);
if (e != rsa->e)
BN_free(e);
return ret;
}
BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
{
BN_BLINDING *ret = NULL;
bn_check_top(mod);
if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
BN_BLINDING_set_current_thread(ret);
if (A != NULL) {
if ((ret->A = BN_dup(A)) == NULL)
goto err;
}
if (Ai != NULL) {
if ((ret->Ai = BN_dup(Ai)) == NULL)
goto err;
}
/* save a copy of mod in the BN_BLINDING structure */
if ((ret->mod = BN_dup(mod)) == NULL)
goto err;
if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0)
BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
/*
* Set the counter to the special value -1 to indicate that this is
* never-used fresh blinding that does not need updating before first
* use.
*/
ret->counter = -1;
return ret;
err:
BN_BLINDING_free(ret);
return NULL;
}
