BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
{
BIGNUM local_n;
BIGNUM *e, *n;
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;
if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL) {
/*
* if PRNG is not properly seeded, resort to secret exponent as
* unpredictable seed
*/
RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
}
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME)) {
/* Set BN_FLG_CONSTTIME flag */
n = &local_n;
BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
} else
n = rsa->n;
ret = BN_BLINDING_create_param(NULL, e, n, ctx,
rsa->meth->bn_mod_exp, rsa->_method_mod_n);
if (ret == NULL) {
RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
goto err;
}
CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
err:
BN_CTX_end(ctx);
if (in_ctx == NULL)
BN_CTX_free(ctx);
if (rsa->e == NULL)
BN_free(e);
return ret;
}
BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
{
BIGNUM local_n;
BIGNUM *e,*n;
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;
if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
{
/* Set BN_FLG_CONSTTIME flag */
n = &local_n;
BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
}
else
n = rsa->n;
ret = BN_BLINDING_create_param(NULL, e, n, ctx,
rsa->meth->bn_mod_exp, rsa->_method_mod_n);
if (ret == NULL)
{
RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
goto err;
}
CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
err:
BN_CTX_end(ctx);
if (in_ctx == NULL)
BN_CTX_free(ctx);
if(rsa->e == NULL)
BN_free(e);
return ret;
}
BN_BLINDING *rsa_setup_blinding(RSA *rsa, BN_CTX *in_ctx) {
BIGNUM local_n;
BIGNUM *e, *n;
BN_CTX *ctx;
BN_BLINDING *ret = NULL;
BN_MONT_CTX *mont_ctx = NULL;
if (in_ctx == NULL) {
ctx = BN_CTX_new();
if (ctx == NULL) {
return 0;
}
} else {
ctx = in_ctx;
}
BN_CTX_start(ctx);
e = BN_CTX_get(ctx);
if (e == NULL) {
OPENSSL_PUT_ERROR(RSA, 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) {
OPENSSL_PUT_ERROR(RSA, RSA_R_NO_PUBLIC_EXPONENT);
goto err;
}
} else {
e = rsa->e;
}
n = &local_n;
BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
if (rsa->flags & RSA_FLAG_CACHE_PUBLIC) {
mont_ctx = BN_MONT_CTX_set_locked(&rsa->mont_n, &rsa->lock, rsa->n, ctx);
if (mont_ctx == NULL) {
goto err;
}
}
ret = BN_BLINDING_create_param(NULL, e, n, ctx, mont_ctx);
if (ret == NULL) {
OPENSSL_PUT_ERROR(RSA, ERR_R_BN_LIB);
goto err;
}
err:
BN_CTX_end(ctx);
if (in_ctx == NULL) {
BN_CTX_free(ctx);
}
if (rsa->e == NULL) {
BN_free(e);
}
return ret;
}
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 RSA *rsa, BN_CTX *ctx) {
assert(ctx != NULL);
BN_BLINDING *ret = OPENSSL_malloc(sizeof(BN_BLINDING));
if (ret == NULL) {
OPENSSL_PUT_ERROR(RSA, ERR_R_MALLOC_FAILURE);
return NULL;
}
memset(ret, 0, sizeof(BN_BLINDING));
ret->A = BN_new();
if (ret->A == NULL) {
goto err;
}
ret->Ai = BN_new();
if (ret->Ai == NULL) {
goto err;
}
if (rsa->e != NULL) {
ret->e = BN_dup(rsa->e);
if (ret->e == NULL) {
goto err;
}
} else {
ret->e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
if (ret->e == NULL) {
OPENSSL_PUT_ERROR(RSA, RSA_R_NO_PUBLIC_EXPONENT);
goto err;
}
}
/* save a copy of mod in the BN_BLINDING structure */
ret->mod = BN_dup(rsa->n);
if (ret->mod == NULL) {
goto err;
}
BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
/* The blinding values need to be created before this blinding can be used. */
ret->counter = BN_BLINDING_COUNTER - 1;
return ret;
err:
BN_BLINDING_free(ret);
return NULL;
}
