work around a bug in BN_div_recp or BN_reciprocal

c04949e9 · Ulf Möller · 505b5a0e · c04949e9
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crypto/bn/bn_recp.c crypto/bn/bn_recp.c +9 -0

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--- a/crypto/bn/bn_recp.c
+++ b/crypto/bn/bn_recp.c
@@ -191,7 +191,16 @@ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *m, BN_RECP_CTX *recp,
 		{
 		if (j++ > 2)
 			{
+#if 1
+			/* work around some bug:
+			   -1CC0E177F93042B29D309839F8019DB93404D7A395F1E162
+			   5383BF622A20B17E1BAA999336988B82B93F5FB77B55B4B68
+			   9412000000000031 / 298EB5957DBFB8CBB2CC2A9F789D2B5
+			   fails, for example. */
+			ret=BN_div(dv,rem,a,&(recp->N),ctx);
+#else
 			BNerr(BN_F_BN_MOD_MUL_RECIPROCAL,BN_R_BAD_RECIPROCAL);
+#endif
 			goto err;
 			}
 		if (!BN_usub(r,r,&(recp->N))) goto err;