static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
{
int to_return = 0;
const RSA_METHOD * def_rsa_method;
/* Try the limits of RSA (2048 bits) */
if(BN_num_bytes(rsa->p) > 128 ||
BN_num_bytes(rsa->q) > 128 ||
BN_num_bytes(rsa->dmp1) > 128 ||
BN_num_bytes(rsa->dmq1) > 128 ||
BN_num_bytes(rsa->iqmp) > 128)
{
#ifdef RSA_NULL
def_rsa_method=RSA_null_method();
#else
#if 0
def_rsa_method=RSA_PKCS1_RSAref();
#else
def_rsa_method=RSA_PKCS1_SSLeay();
#endif
#endif
if(def_rsa_method)
return def_rsa_method->rsa_mod_exp(r0, I, rsa, ctx);
}
if(!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
{
CSWIFTerr(CSWIFT_F_CSWIFT_RSA_MOD_EXP,CSWIFT_R_MISSING_KEY_COMPONENTS);
goto err;
}
to_return = cswift_mod_exp_crt(r0, I, rsa->p, rsa->q, rsa->dmp1,
rsa->dmq1, rsa->iqmp, ctx);
err:
return to_return;
}
/* This function is aliased to mod_exp (with the mont stuff dropped). */
static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
{
const RSA_METHOD * def_rsa_method;
/* Try the limits of RSA (2048 bits) */
if(BN_num_bytes(r) > 256 ||
BN_num_bytes(a) > 256 ||
BN_num_bytes(m) > 256)
{
#ifdef RSA_NULL
def_rsa_method=RSA_null_method();
#else
#if 0
def_rsa_method=RSA_PKCS1_RSAref();
#else
def_rsa_method=RSA_PKCS1_SSLeay();
#endif
#endif
if(def_rsa_method)
return def_rsa_method->bn_mod_exp(r, a, p, m, ctx, m_ctx);
}
return cswift_mod_exp(r, a, p, m, ctx);
}
RSA *RSA_new_method(const RSA_METHOD *meth)
{
RSA *ret;
if (default_RSA_meth == NULL)
{
#ifdef RSA_NULL
default_RSA_meth=RSA_null_method();
#else
#ifdef RSAref
default_RSA_meth=RSA_PKCS1_RSAref();
#else
default_RSA_meth=RSA_PKCS1_SSLeay();
#endif
#endif
}
ret=(RSA *)Malloc(sizeof(RSA));
if (ret == NULL)
{
RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
return(NULL);
}
if (meth == NULL)
ret->meth=default_RSA_meth;
else
ret->meth=meth;
ret->pad=0;
ret->version=0;
ret->n=NULL;
ret->e=NULL;
ret->d=NULL;
ret->p=NULL;
ret->q=NULL;
ret->dmp1=NULL;
ret->dmq1=NULL;
ret->iqmp=NULL;
ret->references=1;
ret->_method_mod_n=NULL;
ret->_method_mod_p=NULL;
ret->_method_mod_q=NULL;
// make blinding per thread
ret->num_blinding_threads = 0;
pthread_mutex_init(&ret->blinding_mutex, NULL);
ret->blinding_array = NULL;
ret->bignum_data=NULL;
ret->flags=ret->meth->flags;
if ((ret->meth->init != NULL) && !ret->meth->init(ret))
{
Free(ret);
ret=NULL;
}
else
CRYPTO_new_ex_data(rsa_meth,ret,&ret->ex_data);
return(ret);
}
const RSA_METHOD *RSA_get_default_method(void)
{
if (default_RSA_meth == NULL)
{
#ifdef RSA_NULL
default_RSA_meth=RSA_null_method();
#else
#if 0 /* was: #ifdef RSAref */
default_RSA_meth=RSA_PKCS1_RSAref();
#else
default_RSA_meth=RSA_PKCS1_SSLeay();
#endif
#endif
}
return default_RSA_meth;
}
