BN_CTX *ctx);
 int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
                           BN_CTX *ctx);
 int BN_BLINDING_is_current_thread(BN_BLINDING *b);
 void BN_BLINDING_set_current_thread(BN_BLINDING *b);
 int BN_BLINDING_lock(BN_BLINDING *b);
 int BN_BLINDING_unlock(BN_BLINDING *b);
 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
 void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
 BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
                           