work around a bug in BN_div_recp or BN_reciprocal

diff --git a/crypto/bn/bn_recp.c b/crypto/bn/bn_recp.c
index 80539c5e2c570d9ab19555864312e0201999ce39..bc0787d75a769d2bd05b5af5ce7a0970be0733b4 100644 (file)
--- 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;