BN_BLINDING *BN_BLINDING_create_param(
BN_BLINDING *b, const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, const BN_MONT_CTX *mont),
const BN_MONT_CTX *mont) {
int retry_counter = 32;
BN_BLINDING *ret = NULL;
if (b == NULL) {
ret = BN_BLINDING_new(NULL, NULL, m);
} else {
ret = b;
}
if (ret == NULL) {
goto err;
}
if (ret->A == NULL && (ret->A = BN_new()) == NULL) {
goto err;
}
if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) {
goto err;
}
if (e != NULL) {
BN_free(ret->e);
ret->e = BN_dup(e);
}
if (ret->e == NULL) {
goto err;
}
if (bn_mod_exp != NULL) {
ret->bn_mod_exp = bn_mod_exp;
}
if (mont != NULL) {
ret->mont = mont;
}
do {
if (!BN_rand_range(ret->A, ret->mod)) {
goto err;
}
int no_inverse;
if (BN_mod_inverse_ex(ret->Ai, &no_inverse, ret->A, ret->mod, ctx) == NULL) {
/* this should almost never happen for good RSA keys */
if (no_inverse) {
if (retry_counter-- == 0) {
OPENSSL_PUT_ERROR(RSA, RSA_R_TOO_MANY_ITERATIONS);
goto err;
}
ERR_clear_error();
} else {
goto err;
}
} else {
break;
}
} while (1);
if (ret->bn_mod_exp != NULL && ret->mont != NULL) {
if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->mont)) {
goto err;
}
} else {
if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) {
goto err;
}
}
return ret;
err:
if (b == NULL) {
BN_BLINDING_free(ret);
ret = NULL;
}
return ret;
}
BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
int (*bn_mod_exp) (BIGNUM *r,
const BIGNUM *a,
const BIGNUM *p,
const BIGNUM *m,
BN_CTX *ctx,
BN_MONT_CTX *m_ctx),
BN_MONT_CTX *m_ctx)
{
int retry_counter = 32;
BN_BLINDING *ret = NULL;
if (b == NULL)
ret = BN_BLINDING_new(NULL, NULL, m);
else
ret = b;
if (ret == NULL)
goto err;
if (ret->A == NULL && (ret->A = BN_new()) == NULL)
goto err;
if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL)
goto err;
if (e != NULL) {
if (ret->e != NULL)
BN_free(ret->e);
ret->e = BN_dup(e);
}
if (ret->e == NULL)
goto err;
if (bn_mod_exp != NULL)
ret->bn_mod_exp = bn_mod_exp;
if (m_ctx != NULL)
ret->m_ctx = m_ctx;
do {
if (!BN_rand_range(ret->A, ret->mod))
goto err;
if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL) {
/*
* this should almost never happen for good RSA keys
*/
unsigned long error = ERR_peek_last_error();
if (ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
if (retry_counter-- == 0) {
BNerr(BN_F_BN_BLINDING_CREATE_PARAM,
BN_R_TOO_MANY_ITERATIONS);
goto err;
}
ERR_clear_error();
} else
goto err;
} else
break;
} while (1);
if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) {
if (!ret->bn_mod_exp
(ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx))
goto err;
} else {
if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx))
goto err;
}
return ret;
err:
if (b == NULL && ret != NULL) {
BN_BLINDING_free(ret);
ret = NULL;
}
return ret;
}
