* [including the GNU Public Licence.]
*/
-#ifndef NO_SHA
+
+
#include <stdio.h>
#include <time.h>
#include "cryptlib.h"
-#include <openssl/sha.h>
+#ifndef OPENSSL_NO_SHA
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/rand.h>
+static int dsa_builtin_keygen(DSA *dsa);
+
int DSA_generate_key(DSA *dsa)
+ {
+ if(dsa->meth->dsa_keygen)
+ return dsa->meth->dsa_keygen(dsa);
+ return dsa_builtin_keygen(dsa);
+ }
+
+static int dsa_builtin_keygen(DSA *dsa)
{
int ok=0;
- unsigned int i;
BN_CTX *ctx=NULL;
BIGNUM *pub_key=NULL,*priv_key=NULL;
else
priv_key=dsa->priv_key;
- i=BN_num_bits(dsa->q);
- for (;;)
- {
- if (!BN_rand(priv_key,i,1,0))
- goto err;
- if (BN_cmp(priv_key,dsa->q) >= 0)
- BN_sub(priv_key,priv_key,dsa->q);
- if (!BN_is_zero(priv_key)) break;
- }
+ do
+ if (!BN_rand_range(priv_key,dsa->q)) goto err;
+ while (BN_is_zero(priv_key));
if (dsa->pub_key == NULL)
{
}
else
pub_key=dsa->pub_key;
+
+ {
+ BIGNUM *local_prk = NULL;
+ BIGNUM *prk;
- if (!BN_mod_exp(pub_key,dsa->g,priv_key,dsa->p,ctx)) goto err;
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
+ {
+ local_prk = prk = BN_new();
+ if(!local_prk) goto err;
+ BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
+ }
+ else
+ prk = priv_key;
+
+ if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx))
+ {
+ if (local_prk != NULL) BN_free(local_prk);
+ goto err;
+ }
+ if (local_prk != NULL) BN_free(local_prk);
+ }
dsa->priv_key=priv_key;
dsa->pub_key=pub_key;