X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Frsa%2Frsa_gen.c;h=767f7ab682ad8beff40c7234931e5dc4d39b9aa3;hb=bf8883b3519c4a91f474c61bdaa6f9f8fcd93259;hp=383d6095f57c989522d1aa6ec860d7f8a7f10173;hpb=8afca8d9c60c3d7db6f9bc94a97c77f016fc139d;p=oweals%2Fopenssl.git

diff --git a/crypto/rsa/rsa_gen.c b/crypto/rsa/rsa_gen.c
index 383d6095f5..767f7ab682 100644
--- a/crypto/rsa/rsa_gen.c
+++ b/crypto/rsa/rsa_gen.c
@@ -85,6 +85,8 @@ int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
 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;
 
@@ -165,16 +167,39 @@ static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
 	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:
@@ -183,8 +208,11 @@ err:
 		RSAerr(RSA_F_RSA_BUILTIN_KEYGEN,ERR_LIB_BN);
 		ok=0;
 		}
-	BN_CTX_end(ctx);
-	BN_CTX_free(ctx);
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
 
 	return ok;
 	}