1 files changed, 13 insertions, 9 deletions

diff --git a/src/lib/libcrypto/bn/bn_recp.c b/src/lib/libcrypto/bn/bn_recp.c
index ef5fdd4708..2e8efb8dae 100644
--- a/src/lib/libcrypto/bn/bn_recp.c
+++ b/src/lib/libcrypto/bn/bn_recp.c
@@ -94,7 +94,7 @@ void BN_RECP_CTX_free(BN_RECP_CTX *recp)
 int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *d, BN_CTX *ctx)
         {
         if (!BN_copy(&(recp->N),d)) return 0;
-        if (!BN_zero(&(recp->Nr))) return 0;
+        BN_zero(&(recp->Nr));
         recp->num_bits=BN_num_bits(d);
         recp->shift=0;
         return(1);
@@ -123,6 +123,7 @@ int BN_mod_mul_reciprocal(BIGNUM *r, const BIGNUM *x, const BIGNUM *y,
         ret = BN_div_recp(NULL,r,ca,recp,ctx);
 err:
         BN_CTX_end(ctx);
+        bn_check_top(r);
         return(ret);
         }
 
@@ -147,7 +148,7 @@ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
 
         if (BN_ucmp(m,&(recp->N)) < 0)
                 {
-                if (!BN_zero(d)) return 0;
+                BN_zero(d);
                 if (!BN_copy(r,m)) return 0;
                 BN_CTX_end(ctx);
                 return(1);
@@ -190,7 +191,7 @@ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
                 {
                 if (j++ > 2)
                         {
-                        BNerr(BN_F_BN_MOD_MUL_RECIPROCAL,BN_R_BAD_RECIPROCAL);
+                        BNerr(BN_F_BN_DIV_RECP,BN_R_BAD_RECIPROCAL);
                         goto err;
                         }
                 if (!BN_usub(r,r,&(recp->N))) goto err;
@@ -203,6 +204,8 @@ int BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
         ret=1;
 err:
         BN_CTX_end(ctx);
+        bn_check_top(dv);
+        bn_check_top(rem);
         return(ret);
         } 
 
@@ -214,17 +217,18 @@ err:
 int BN_reciprocal(BIGNUM *r, const BIGNUM *m, int len, BN_CTX *ctx)
         {
         int ret= -1;
-        BIGNUM t;
+        BIGNUM *t;
 
-        BN_init(&t);
+        BN_CTX_start(ctx);
+        if((t = BN_CTX_get(ctx)) == NULL) goto err;
 
-        if (!BN_zero(&t)) goto err;
-        if (!BN_set_bit(&t,len)) goto err;
+        if (!BN_set_bit(t,len)) goto err;
 
-        if (!BN_div(r,NULL,&t,m,ctx)) goto err;
+        if (!BN_div(r,NULL,t,m,ctx)) goto err;
 
         ret=len;
 err:
-        BN_free(&t);
+        bn_check_top(r);
+        BN_CTX_end(ctx);
         return(ret);
         }