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; }