* - Geoff
*/
+
+
#include <stdio.h>
#include <time.h>
#include "cryptlib.h"
static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
{
BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp;
+ BIGNUM *local_r0, *local_d, *local_p;
+ BIGNUM *pr0,*d,*p;
int bitsp,bitsq,ok= -1,n=0;
BN_CTX *ctx=NULL;
+ local_r0 = BN_new();
+ local_d = BN_new();
+ local_p = BN_new();
+ if(!local_r0 || !local_d || !local_p)
+ goto err;
+
ctx=BN_CTX_new();
if (ctx == NULL) goto err;
BN_CTX_start(ctx);
if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */
if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */
if (!BN_mul(r0,r1,r2,ctx)) goto err; /* (p-1)(q-1) */
- if (!BN_mod_inverse(rsa->d,rsa->e,r0,ctx)) goto err; /* d */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ pr0 = local_r0;
+ BN_with_flags(pr0, r0, BN_FLG_CONSTTIME);
+ }
+ else
+ pr0 = r0;
+ if (!BN_mod_inverse(rsa->d,rsa->e,pr0,ctx)) goto err; /* d */
+
+ /* set up d for correct BN_FLG_CONSTTIME flag */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ d = local_d;
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+ }
+ else
+ d = rsa->d;
/* calculate d mod (p-1) */
- if (!BN_mod(rsa->dmp1,rsa->d,r1,ctx)) goto err;
+ if (!BN_mod(rsa->dmp1,d,r1,ctx)) goto err;
/* calculate d mod (q-1) */
- if (!BN_mod(rsa->dmq1,rsa->d,r2,ctx)) goto err;
+ if (!BN_mod(rsa->dmq1,d,r2,ctx)) goto err;
/* calculate inverse of q mod p */
- if (!BN_mod_inverse(rsa->iqmp,rsa->q,rsa->p,ctx)) goto err;
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ p = local_p;
+ BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
+ }
+ else
+ p = rsa->p;
+ if (!BN_mod_inverse(rsa->iqmp,rsa->q,p,ctx)) goto err;
ok=1;
err:
+ if(local_r0) BN_free(local_r0);
+ if(local_d) BN_free(local_d);
+ if(local_p) BN_free(local_p);
if (ok == -1)
{
RSAerr(RSA_F_RSA_BUILTIN_KEYGEN,ERR_LIB_BN);