c3-lang/libtommath

diff --git a/bn_fast_mp_invmod.c b/bn_fast_mp_invmod.c
index c595247..25e145b 100644
--- a/bn_fast_mp_invmod.c
+++ b/bn_fast_mp_invmod.c
@@ -27,7 +27,7 @@ int fast_mp_invmod (mp_int * a, mp_int * b, mp_int * c)
   int     res, neg;
 
   /* 2. [modified] b must be odd   */
-  if (mp_iseven (b) == 1) {
+  if (mp_iseven (b) == MP_YES) {
     return MP_VAL;
   }
 
@@ -57,13 +57,13 @@ int fast_mp_invmod (mp_int * a, mp_int * b, mp_int * c)
 
 top:
   /* 4.  while u is even do */
-  while (mp_iseven (&u) == 1) {
+  while (mp_iseven (&u) == MP_YES) {
     /* 4.1 u = u/2 */
     if ((res = mp_div_2 (&u, &u)) != MP_OKAY) {
       goto LBL_ERR;
     }
     /* 4.2 if B is odd then */
-    if (mp_isodd (&B) == 1) {
+    if (mp_isodd (&B) == MP_YES) {
       if ((res = mp_sub (&B, &x, &B)) != MP_OKAY) {
         goto LBL_ERR;
       }
@@ -75,13 +75,13 @@ top:
   }
 
   /* 5.  while v is even do */
-  while (mp_iseven (&v) == 1) {
+  while (mp_iseven (&v) == MP_YES) {
     /* 5.1 v = v/2 */
     if ((res = mp_div_2 (&v, &v)) != MP_OKAY) {
       goto LBL_ERR;
     }
     /* 5.2 if D is odd then */
-    if (mp_isodd (&D) == 1) {
+    if (mp_isodd (&D) == MP_YES) {
       /* D = (D-x)/2 */
       if ((res = mp_sub (&D, &x, &D)) != MP_OKAY) {
         goto LBL_ERR;
@@ -115,7 +115,7 @@ top:
   }
 
   /* if not zero goto step 4 */
-  if (mp_iszero (&u) == 0) {
+  if (mp_iszero (&u) == MP_NO) {
     goto top;
   }
 
diff --git a/bn_fast_s_mp_mul_digs.c b/bn_fast_s_mp_mul_digs.c
index adda3f5..4d4000c 100644
--- a/bn_fast_s_mp_mul_digs.c
+++ b/bn_fast_s_mp_mul_digs.c
@@ -78,7 +78,7 @@ int fast_s_mp_mul_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
 
       /* make next carry */
       _W = _W >> ((mp_word)DIGIT_BIT);
- }
+  }
 
   /* setup dest */
   olduse  = c->used;
diff --git a/bn_mp_cnt_lsb.c b/bn_mp_cnt_lsb.c
index a617767..92cc4e8 100644
--- a/bn_mp_cnt_lsb.c
+++ b/bn_mp_cnt_lsb.c
@@ -26,12 +26,12 @@ int mp_cnt_lsb(mp_int *a)
    mp_digit q, qq;
 
    /* easy out */
-   if (mp_iszero(a) == 1) {
+   if (mp_iszero(a) == MP_YES) {
       return 0;
    }
 
    /* scan lower digits until non-zero */
-   for (x = 0; x < a->used && a->dp[x] == 0; x++);
+   for (x = 0; x < a->used && a->dp[x] == 0; x++) {}
    q = a->dp[x];
    x *= DIGIT_BIT;
 
diff --git a/bn_mp_div.c b/bn_mp_div.c
index 336a57b..2b87399 100644
--- a/bn_mp_div.c
+++ b/bn_mp_div.c
@@ -24,7 +24,7 @@ int mp_div(mp_int * a, mp_int * b, mp_int * c, mp_int * d)
    int    res, n, n2;
 
   /* is divisor zero ? */
-  if (mp_iszero (b) == 1) {
+  if (mp_iszero (b) == MP_YES) {
     return MP_VAL;
   }
 
@@ -40,7 +40,7 @@ int mp_div(mp_int * a, mp_int * b, mp_int * c, mp_int * d)
     }
     return res;
   }
-	
+
   /* init our temps */
   if ((res = mp_init_multi(&ta, &tb, &tq, &q, NULL)) != MP_OKAY) {
      return res;
@@ -50,7 +50,7 @@ int mp_div(mp_int * a, mp_int * b, mp_int * c, mp_int * d)
   mp_set(&tq, 1);
   n = mp_count_bits(a) - mp_count_bits(b);
   if (((res = mp_abs(a, &ta)) != MP_OKAY) ||
-      ((res = mp_abs(b, &tb)) != MP_OKAY) || 
+      ((res = mp_abs(b, &tb)) != MP_OKAY) ||
       ((res = mp_mul_2d(&tb, n, &tb)) != MP_OKAY) ||
       ((res = mp_mul_2d(&tq, n, &tq)) != MP_OKAY)) {
       goto LBL_ERR;
@@ -87,17 +87,17 @@ LBL_ERR:
 
 #else
 
-/* integer signed division. 
+/* integer signed division.
  * c*b + d == a [e.g. a/b, c=quotient, d=remainder]
  * HAC pp.598 Algorithm 14.20
  *
- * Note that the description in HAC is horribly 
- * incomplete.  For example, it doesn't consider 
- * the case where digits are removed from 'x' in 
- * the inner loop.  It also doesn't consider the 
+ * Note that the description in HAC is horribly
+ * incomplete.  For example, it doesn't consider
+ * the case where digits are removed from 'x' in
+ * the inner loop.  It also doesn't consider the
  * case that y has fewer than three digits, etc..
  *
- * The overall algorithm is as described as 
+ * The overall algorithm is as described as
  * 14.20 from HAC but fixed to treat these cases.
 */
 int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
@@ -106,7 +106,7 @@ int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
   int     res, n, t, i, norm, neg;
 
   /* is divisor zero ? */
-  if (mp_iszero (b) == 1) {
+  if (mp_iszero (b) == MP_YES) {
     return MP_VAL;
   }
 
@@ -187,7 +187,7 @@ int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
       continue;
     }
 
-    /* step 3.1 if xi == yt then set q{i-t-1} to b-1, 
+    /* step 3.1 if xi == yt then set q{i-t-1} to b-1,
      * otherwise set q{i-t-1} to (xi*b + x{i-1})/yt */
     if (x.dp[i] == y.dp[t]) {
       q.dp[i - t - 1] = ((((mp_digit)1) << DIGIT_BIT) - 1);
@@ -196,15 +196,16 @@ int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
       tmp = ((mp_word) x.dp[i]) << ((mp_word) DIGIT_BIT);
       tmp |= ((mp_word) x.dp[i - 1]);
       tmp /= ((mp_word) y.dp[t]);
-      if (tmp > (mp_word) MP_MASK)
+      if (tmp > (mp_word) MP_MASK) {
         tmp = MP_MASK;
+      }
       q.dp[i - t - 1] = (mp_digit) (tmp & (mp_word) (MP_MASK));
     }
 
-    /* while (q{i-t-1} * (yt * b + y{t-1})) > 
-             xi * b**2 + xi-1 * b + xi-2 
-     
-       do q{i-t-1} -= 1; 
+    /* while (q{i-t-1} * (yt * b + y{t-1})) >
+             xi * b**2 + xi-1 * b + xi-2
+
+       do q{i-t-1} -= 1;
     */
     q.dp[i - t - 1] = (q.dp[i - t - 1] + 1) & MP_MASK;
     do {
@@ -255,10 +256,10 @@ int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
     }
   }
 
-  /* now q is the quotient and x is the remainder 
-   * [which we have to normalize] 
+  /* now q is the quotient and x is the remainder
+   * [which we have to normalize]
    */
-  
+
   /* get sign before writing to c */
   x.sign = x.used == 0 ? MP_ZPOS : a->sign;
 
@@ -269,7 +270,9 @@ int mp_div (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
   }
 
   if (d != NULL) {
-    mp_div_2d (&x, norm, &x, NULL);
+    if ((res = mp_div_2d (&x, norm, &x, NULL)) != MP_OKAY) {
+      goto LBL_Y;
+    }
     mp_exch (&x, d);
   }
 
diff --git a/bn_mp_div_d.c b/bn_mp_div_d.c
index 579221d..dbaeb10 100644
--- a/bn_mp_div_d.c
+++ b/bn_mp_div_d.c
@@ -20,7 +20,7 @@ static int s_is_power_of_two(mp_digit b, int *p)
    int x;
 
    /* fast return if no power of two */
-   if ((b==0) || (b & (b-1))) {
+   if ((b == 0) || ((b & (b-1)) != 0)) {
       return 0;
    }
 
@@ -47,7 +47,7 @@ int mp_div_d (mp_int * a, mp_digit b, mp_int * c, mp_digit * d)
   }
 
   /* quick outs */
-  if (b == 1 || mp_iszero(a) == 1) {
+  if (b == 1 || mp_iszero(a) == MP_YES) {
      if (d != NULL) {
         *d = 0;
      }
diff --git a/bn_mp_dr_reduce.c b/bn_mp_dr_reduce.c
index 84c3006..7cfe462 100644
--- a/bn_mp_dr_reduce.c
+++ b/bn_mp_dr_reduce.c
@@ -82,7 +82,9 @@ top:
    * Each successive "recursion" makes the input smaller and smaller.
    */
   if (mp_cmp_mag (x, n) != MP_LT) {
-    s_mp_sub(x, n, x);
+    if ((err = s_mp_sub(x, n, x)) != MP_OKAY) {
+      return err;
+    }
     goto top;
   }
   return MP_OKAY;
diff --git a/bn_mp_export.c b/bn_mp_export.c
index 1a82e4a..7829315 100644
--- a/bn_mp_export.c
+++ b/bn_mp_export.c
@@ -34,7 +34,8 @@ int mp_export(void* rop, size_t* countp, int order, size_t size,
 		union {
 			unsigned int i;
 			char c[4];
-		} lint = {0x01020304};
+		} lint;
+		lint.i = 0x01020304;
 
 		endian = (lint.c[0] == 4 ? -1 : 1);
 	}
@@ -47,7 +48,7 @@ int mp_export(void* rop, size_t* countp, int order, size_t size,
 	nail_bytes = nails / 8;
 
 	bits = mp_count_bits(&t);
-	count = bits / (size * 8 - nails) + (bits % (size * 8 - nails) ? 1 : 0);
+	count = bits / (size * 8 - nails) + ((bits % (size * 8 - nails) != 0) ? 1 : 0);
 
 	for (i = 0; i < count; ++i) {
 		for (j = 0; j < size; ++j) {
@@ -73,7 +74,7 @@ int mp_export(void* rop, size_t* countp, int order, size_t size,
 
 	mp_clear(&t);
 
-	if (countp) {
+	if (countp != NULL) {
 		*countp = count;
 	}
 
diff --git a/bn_mp_expt_d_ex.c b/bn_mp_expt_d_ex.c
index 93f4f19..8b12d24 100644
--- a/bn_mp_expt_d_ex.c
+++ b/bn_mp_expt_d_ex.c
@@ -30,10 +30,10 @@ int mp_expt_d_ex (mp_int * a, mp_digit b, mp_int * c, int fast)
   /* set initial result */
   mp_set (c, 1);
 
-  if (fast) {
+  if (fast != 0) {
     while (b > 0) {
       /* if the bit is set multiply */
-      if (b & 1) {
+      if ((b & 1) != 0) {
         if ((res = mp_mul (c, &g, c)) != MP_OKAY) {
           mp_clear (&g);
           return res;
@@ -41,9 +41,11 @@ int mp_expt_d_ex (mp_int * a, mp_digit b, mp_int * c, int fast)
       }
 
       /* square */
-      if (b > 1 && (res = mp_sqr (&g, &g)) != MP_OKAY) {
-        mp_clear (&g);
-        return res;
+      if (b > 1) {
+        if ((res = mp_sqr (&g, &g)) != MP_OKAY) {
+          mp_clear (&g);
+          return res;
+        }
       }
 
       /* shift to next bit */
@@ -69,9 +71,9 @@ int mp_expt_d_ex (mp_int * a, mp_digit b, mp_int * c, int fast)
       /* shift to next bit */
       b <<= 1;
     }
-    } /* if ... else */
+  } /* if ... else */
 
-    mp_clear (&g);
+  mp_clear (&g);
   return MP_OKAY;
 }
 #endif
diff --git a/bn_mp_exptmod.c b/bn_mp_exptmod.c
index da0a8d3..1d9059e 100644
--- a/bn_mp_exptmod.c
+++ b/bn_mp_exptmod.c
@@ -89,7 +89,7 @@ int mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
     
   /* if the modulus is odd or dr != 0 use the montgomery method */
 #ifdef BN_MP_EXPTMOD_FAST_C
-  if (mp_isodd (P) == 1 || dr !=  0) {
+  if (mp_isodd (P) == MP_YES || dr !=  0) {
     return mp_exptmod_fast (G, X, P, Y, dr);
   } else {
 #endif
diff --git a/bn_mp_exteuclid.c b/bn_mp_exteuclid.c
index c486e1c..f04fca0 100644
--- a/bn_mp_exteuclid.c
+++ b/bn_mp_exteuclid.c
@@ -15,7 +15,7 @@
  * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
  */
 
-/* Extended euclidean algorithm of (a, b) produces 
+/* Extended euclidean algorithm of (a, b) produces
    a*u1 + b*u2 = u3
  */
 int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
@@ -61,9 +61,9 @@ int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
 
    /* make sure U3 >= 0 */
    if (u3.sign == MP_NEG) {
-      mp_neg(&u1, &u1);
-      mp_neg(&u2, &u2);
-      mp_neg(&u3, &u3);
+       if ((err = mp_neg(&u1, &u1)) != MP_OKAY)                                   { goto _ERR; }
+       if ((err = mp_neg(&u2, &u2)) != MP_OKAY)                                   { goto _ERR; }
+       if ((err = mp_neg(&u3, &u3)) != MP_OKAY)                                   { goto _ERR; }
    }
 
    /* copy result out */
diff --git a/bn_mp_gcd.c b/bn_mp_gcd.c
index 7d1c1c6..8cf6e00 100644
--- a/bn_mp_gcd.c
+++ b/bn_mp_gcd.c
@@ -70,7 +70,7 @@ int mp_gcd (mp_int * a, mp_int * b, mp_int * c)
      }
   }
 
-  while (mp_iszero(&v) == 0) {
+  while (mp_iszero(&v) == MP_NO) {
      /* make sure v is the largest */
      if (mp_cmp_mag(&u, &v) == MP_GT) {
         /* swap u and v to make sure v is >= u */
diff --git a/bn_mp_get_long.c b/bn_mp_get_long.c
index 8286082..7f2a54b 100644
--- a/bn_mp_get_long.c
+++ b/bn_mp_get_long.c
@@ -31,7 +31,7 @@ unsigned long mp_get_long(mp_int * a)
   /* get most significant digit of result */
   res = DIGIT(a,i);
 
-#if ULONG_MAX != 0xfffffffful || DIGIT_BIT < 32
+#if ULONG_MAX != 0xffffffffuL || DIGIT_BIT < 32
   while (--i >= 0) {
     res = (res << DIGIT_BIT) | DIGIT(a,i);
   }
diff --git a/bn_mp_import.c b/bn_mp_import.c
index b5d4ed9..c106e02 100644
--- a/bn_mp_import.c
+++ b/bn_mp_import.c
@@ -30,7 +30,8 @@ int mp_import(mp_int* rop, size_t count, int order, size_t size,
 		union {
 			unsigned int i;
 			char c[4];
-		} lint = {0x01020304};
+		} lint;
+		lint.i = 0x01020304;
 
 		endian = (lint.c[0] == 4 ? -1 : 1);
 	}
diff --git a/bn_mp_init_multi.c b/bn_mp_init_multi.c
index 830068c..388b813 100644
--- a/bn_mp_init_multi.c
+++ b/bn_mp_init_multi.c
@@ -37,7 +37,7 @@ int mp_init_multi(mp_int *mp, ...)
             /* now start cleaning up */            
             cur_arg = mp;
             va_start(clean_args, mp);
-            while (n--) {
+            while (n-- != 0) {
                 mp_clear(cur_arg);
                 cur_arg = va_arg(clean_args, mp_int*);
             }
diff --git a/bn_mp_invmod.c b/bn_mp_invmod.c
index 67a9a61..c0eb2c0 100644
--- a/bn_mp_invmod.c
+++ b/bn_mp_invmod.c
@@ -19,13 +19,13 @@
 int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
 {
   /* b cannot be negative */
-  if (b->sign == MP_NEG || mp_iszero(b) == 1) {
+  if (b->sign == MP_NEG || mp_iszero(b) == MP_YES) {
     return MP_VAL;
   }
 
 #ifdef BN_FAST_MP_INVMOD_C
   /* if the modulus is odd we can use a faster routine instead */
-  if (mp_isodd (b) == 1) {
+  if (mp_isodd (b) == MP_YES) {
     return fast_mp_invmod (a, b, c);
   }
 #endif
diff --git a/bn_mp_invmod_slow.c b/bn_mp_invmod_slow.c
index e0adda9..50ce2c1 100644
--- a/bn_mp_invmod_slow.c
+++ b/bn_mp_invmod_slow.c
@@ -22,7 +22,7 @@ int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c)
   int     res;
 
   /* b cannot be negative */
-  if (b->sign == MP_NEG || mp_iszero(b) == 1) {
+  if (b->sign == MP_NEG || mp_iszero(b) == MP_YES) {
     return MP_VAL;
   }
 
@@ -41,7 +41,7 @@ int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c)
   }
 
   /* 2. [modified] if x,y are both even then return an error! */
-  if (mp_iseven (&x) == 1 && mp_iseven (&y) == 1) {
+  if (mp_iseven (&x) == MP_YES && mp_iseven (&y) == MP_YES) {
     res = MP_VAL;
     goto LBL_ERR;
   }
@@ -58,13 +58,13 @@ int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c)
 
 top:
   /* 4.  while u is even do */
-  while (mp_iseven (&u) == 1) {
+  while (mp_iseven (&u) == MP_YES) {
     /* 4.1 u = u/2 */
     if ((res = mp_div_2 (&u, &u)) != MP_OKAY) {
       goto LBL_ERR;
     }
     /* 4.2 if A or B is odd then */
-    if (mp_isodd (&A) == 1 || mp_isodd (&B) == 1) {
+    if (mp_isodd (&A) == MP_YES || mp_isodd (&B) == MP_YES) {
       /* A = (A+y)/2, B = (B-x)/2 */
       if ((res = mp_add (&A, &y, &A)) != MP_OKAY) {
          goto LBL_ERR;
@@ -83,13 +83,13 @@ top:
   }
 
   /* 5.  while v is even do */
-  while (mp_iseven (&v) == 1) {
+  while (mp_iseven (&v) == MP_YES) {
     /* 5.1 v = v/2 */
     if ((res = mp_div_2 (&v, &v)) != MP_OKAY) {
       goto LBL_ERR;
     }
     /* 5.2 if C or D is odd then */
-    if (mp_isodd (&C) == 1 || mp_isodd (&D) == 1) {
+    if (mp_isodd (&C) == MP_YES || mp_isodd (&D) == MP_YES) {
       /* C = (C+y)/2, D = (D-x)/2 */
       if ((res = mp_add (&C, &y, &C)) != MP_OKAY) {
          goto LBL_ERR;
@@ -137,7 +137,7 @@ top:
   }
 
   /* if not zero goto step 4 */
-  if (mp_iszero (&u) == 0)
+  if (mp_iszero (&u) == MP_NO)
     goto top;
 
   /* now a = C, b = D, gcd == g*v */
diff --git a/bn_mp_is_square.c b/bn_mp_is_square.c
index 5348ca9..8c2f221 100644
--- a/bn_mp_is_square.c
+++ b/bn_mp_is_square.c
@@ -82,13 +82,13 @@ int mp_is_square(mp_int *arg,int *ret)
    * free "t" so the easiest way is to goto ERR.  We know that res
    * is already equal to MP_OKAY from the mp_mod call 
    */ 
-  if ( (1L<<(r%11)) & 0x5C4L )             goto ERR;
-  if ( (1L<<(r%13)) & 0x9E4L )             goto ERR;
-  if ( (1L<<(r%17)) & 0x5CE8L )            goto ERR;
-  if ( (1L<<(r%19)) & 0x4F50CL )           goto ERR;
-  if ( (1L<<(r%23)) & 0x7ACCA0L )          goto ERR;
-  if ( (1L<<(r%29)) & 0xC2EDD0CL )         goto ERR;
-  if ( (1L<<(r%31)) & 0x6DE2B848L )        goto ERR;
+  if (((1L<<(r%11)) & 0x5C4L) != 0L)       goto ERR;
+  if (((1L<<(r%13)) & 0x9E4L) != 0L)       goto ERR;
+  if (((1L<<(r%17)) & 0x5CE8L) != 0L)      goto ERR;
+  if (((1L<<(r%19)) & 0x4F50CL) != 0L)     goto ERR;
+  if (((1L<<(r%23)) & 0x7ACCA0L) != 0L)    goto ERR;
+  if (((1L<<(r%29)) & 0xC2EDD0CL) != 0L)   goto ERR;
+  if (((1L<<(r%31)) & 0x6DE2B848L) != 0L)  goto ERR;
 
   /* Final check - is sqr(sqrt(arg)) == arg ? */
   if ((res = mp_sqrt(arg,&t)) != MP_OKAY) {
diff --git a/bn_mp_jacobi.c b/bn_mp_jacobi.c
index b0722df..b8427a5 100644
--- a/bn_mp_jacobi.c
+++ b/bn_mp_jacobi.c
@@ -30,7 +30,7 @@ int mp_jacobi (mp_int * a, mp_int * p, int *c)
   }
 
   /* step 1.  if a == 0, return 0 */
-  if (mp_iszero (a) == 1) {
+  if (mp_iszero (a) == MP_YES) {
     *c = 0;
     return MP_OKAY;
   }
diff --git a/bn_mp_mod.c b/bn_mp_mod.c
index 589972d..f7eb1c4 100644
--- a/bn_mp_mod.c
+++ b/bn_mp_mod.c
@@ -31,7 +31,7 @@ mp_mod (mp_int * a, mp_int * b, mp_int * c)
     return res;
   }
 
-  if (mp_iszero(&t) || t.sign == b->sign) {
+  if (mp_iszero(&t) != MP_NO || t.sign == b->sign) {
     res = MP_OKAY;
     mp_exch (&t, c);
   } else {
diff --git a/bn_mp_montgomery_reduce.c b/bn_mp_montgomery_reduce.c
index ffdd127..e92a988 100644
--- a/bn_mp_montgomery_reduce.c
+++ b/bn_mp_montgomery_reduce.c
@@ -85,7 +85,7 @@ mp_montgomery_reduce (mp_int * x, mp_int * n, mp_digit rho)
 
 
       /* propagate carries upwards as required*/
-      while (u) {
+      while (u != 0) {
         *tmpx   += u;
         u        = *tmpx >> DIGIT_BIT;
         *tmpx++ &= MP_MASK;
diff --git a/bn_mp_mul.c b/bn_mp_mul.c
index 74b5135..d7f0074 100644
--- a/bn_mp_mul.c
+++ b/bn_mp_mul.c
@@ -49,12 +49,13 @@ int mp_mul (mp_int * a, mp_int * b, mp_int * c)
       res = fast_s_mp_mul_digs (a, b, c, digs);
     } else 
 #endif
+    {
 #ifdef BN_S_MP_MUL_DIGS_C
       res = s_mp_mul (a, b, c); /* uses s_mp_mul_digs */
 #else
       res = MP_VAL;
 #endif
-
+    }
   }
   c->sign = (c->used > 0) ? neg : MP_ZPOS;
   return res;
diff --git a/bn_mp_prime_next_prime.c b/bn_mp_prime_next_prime.c
index e306f3b..a977a44 100644
--- a/bn_mp_prime_next_prime.c
+++ b/bn_mp_prime_next_prime.c
@@ -84,7 +84,7 @@ int mp_prime_next_prime(mp_int *a, int t, int bbs_style)
          if ((err = mp_sub_d(a, (a->dp[0] & 3) + 1, a)) != MP_OKAY) { return err; };
       }
    } else {
-      if (mp_iseven(a) == 1) {
+      if (mp_iseven(a) == MP_YES) {
          /* force odd */
          if ((err = mp_sub_d(a, 1, a)) != MP_OKAY) {
             return err;
diff --git a/bn_mp_prime_random_ex.c b/bn_mp_prime_random_ex.c
index 981a8fe..3dfc425 100644
--- a/bn_mp_prime_random_ex.c
+++ b/bn_mp_prime_random_ex.c
@@ -41,7 +41,7 @@ int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback
    }
 
    /* LTM_PRIME_SAFE implies LTM_PRIME_BBS */
-   if (flags & LTM_PRIME_SAFE) {
+   if ((flags & LTM_PRIME_SAFE) != 0) {
       flags |= LTM_PRIME_BBS;
    }
 
@@ -60,13 +60,13 @@ int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback
    /* calc the maskOR_msb */
    maskOR_msb        = 0;
    maskOR_msb_offset = ((size & 7) == 1) ? 1 : 0;
-   if (flags & LTM_PRIME_2MSB_ON) {
+   if ((flags & LTM_PRIME_2MSB_ON) != 0) {
       maskOR_msb       |= 0x80 >> ((9 - size) & 7);
    }  
 
    /* get the maskOR_lsb */
    maskOR_lsb         = 1;
-   if (flags & LTM_PRIME_BBS) {
+   if ((flags & LTM_PRIME_BBS) != 0) {
       maskOR_lsb     |= 3;
    }
 
@@ -94,7 +94,7 @@ int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback
          continue;
       }
 
-      if (flags & LTM_PRIME_SAFE) {
+      if ((flags & LTM_PRIME_SAFE) != 0) {
          /* see if (a-1)/2 is prime */
          if ((err = mp_sub_d(a, 1, a)) != MP_OKAY)                    { goto error; }
          if ((err = mp_div_2(a, a)) != MP_OKAY)                       { goto error; }
@@ -104,7 +104,7 @@ int mp_prime_random_ex(mp_int *a, int t, int size, int flags, ltm_prime_callback
       }
    } while (res == MP_NO);
 
-   if (flags & LTM_PRIME_SAFE) {
+   if ((flags & LTM_PRIME_SAFE) != 0) {
       /* restore a to the original value */
       if ((err = mp_mul_2(a, a)) != MP_OKAY)                          { goto error; }
       if ((err = mp_add_d(a, 1, a)) != MP_OKAY)                       { goto error; }
diff --git a/bn_mp_read_radix.c b/bn_mp_read_radix.c
index 178339e..d407e9d 100644
--- a/bn_mp_read_radix.c
+++ b/bn_mp_read_radix.c
@@ -43,12 +43,12 @@ int mp_read_radix (mp_int * a, const char *str, int radix)
   mp_zero (a);
   
   /* process each digit of the string */
-  while (*str) {
+  while (*str != '\0') {
     /* if the radix <= 36 the conversion is case insensitive
      * this allows numbers like 1AB and 1ab to represent the same  value
      * [e.g. in hex]
      */
-    ch = (char) ((radix <= 36) ? toupper ((int)*str) : *str);
+    ch = (radix <= 36) ? (char)toupper((int)*str) : *str;
     for (y = 0; y < 64; y++) {
       if (ch == mp_s_rmap[y]) {
          break;
@@ -73,7 +73,7 @@ int mp_read_radix (mp_int * a, const char *str, int radix)
   }
   
   /* set the sign only if a != 0 */
-  if (mp_iszero(a) != 1) {
+  if (mp_iszero(a) != MP_YES) {
      a->sign = neg;
   }
   return MP_OKAY;
diff --git a/bn_mp_read_unsigned_bin.c b/bn_mp_read_unsigned_bin.c
index 3598ec8..4d0472c 100644
--- a/bn_mp_read_unsigned_bin.c
+++ b/bn_mp_read_unsigned_bin.c
@@ -37,12 +37,12 @@ int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c)
     }
 
 #ifndef MP_8BIT
-      a->dp[0] |= *b++;
-      a->used += 1;
+    a->dp[0] |= *b++;
+    a->used += 1;
 #else
-      a->dp[0] = (*b & MP_MASK);
-      a->dp[1] |= ((*b++ >> 7U) & 1);
-      a->used += 2;
+    a->dp[0] = (*b & MP_MASK);
+    a->dp[1] |= ((*b++ >> 7U) & 1);
+    a->used += 2;
 #endif
   }
   mp_clamp (a);
diff --git a/bn_mp_reduce_2k.c b/bn_mp_reduce_2k.c
index cfa59c7..d19b847 100644
--- a/bn_mp_reduce_2k.c
+++ b/bn_mp_reduce_2k.c
@@ -20,35 +20,37 @@ int mp_reduce_2k(mp_int *a, mp_int *n, mp_digit d)
 {
    mp_int q;
    int    p, res;
-   
+
    if ((res = mp_init(&q)) != MP_OKAY) {
       return res;
    }
-   
-   p = mp_count_bits(n);    
+
+   p = mp_count_bits(n);
 top:
    /* q = a/2**p, a = a mod 2**p */
    if ((res = mp_div_2d(a, p, &q, a)) != MP_OKAY) {
       goto ERR;
    }
-   
+
    if (d != 1) {
       /* q = q * d */
-      if ((res = mp_mul_d(&q, d, &q)) != MP_OKAY) { 
+      if ((res = mp_mul_d(&q, d, &q)) != MP_OKAY) {
          goto ERR;
       }
    }
-   
+
    /* a = a + q */
    if ((res = s_mp_add(a, &q, a)) != MP_OKAY) {
       goto ERR;
    }
-   
+
    if (mp_cmp_mag(a, n) != MP_LT) {
-      s_mp_sub(a, n, a);
+      if ((res = s_mp_sub(a, n, a)) != MP_OKAY) {
+         goto ERR;
+      }
       goto top;
    }
-   
+
 ERR:
    mp_clear(&q);
    return res;
diff --git a/bn_mp_reduce_2k_l.c b/bn_mp_reduce_2k_l.c
index 076018c..675065f 100644
--- a/bn_mp_reduce_2k_l.c
+++ b/bn_mp_reduce_2k_l.c
@@ -15,7 +15,7 @@
  * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
  */
 
-/* reduces a modulo n where n is of the form 2**p - d 
+/* reduces a modulo n where n is of the form 2**p - d
    This differs from reduce_2k since "d" can be larger
    than a single digit.
 */
@@ -23,33 +23,35 @@ int mp_reduce_2k_l(mp_int *a, mp_int *n, mp_int *d)
 {
    mp_int q;
    int    p, res;
-   
+
    if ((res = mp_init(&q)) != MP_OKAY) {
       return res;
    }
-   
-   p = mp_count_bits(n);    
+
+   p = mp_count_bits(n);
 top:
    /* q = a/2**p, a = a mod 2**p */
    if ((res = mp_div_2d(a, p, &q, a)) != MP_OKAY) {
       goto ERR;
    }
-   
+
    /* q = q * d */
-   if ((res = mp_mul(&q, d, &q)) != MP_OKAY) { 
+   if ((res = mp_mul(&q, d, &q)) != MP_OKAY) {
       goto ERR;
    }
-   
+
    /* a = a + q */
    if ((res = s_mp_add(a, &q, a)) != MP_OKAY) {
       goto ERR;
    }
-   
+
    if (mp_cmp_mag(a, n) != MP_LT) {
-      s_mp_sub(a, n, a);
+      if ((res = s_mp_sub(a, n, a)) != MP_OKAY) {
+         goto ERR;
+      }
       goto top;
    }
-   
+
 ERR:
    mp_clear(&q);
    return res;
diff --git a/bn_mp_shrink.c b/bn_mp_shrink.c
index 0eaa09e..bbc1208 100644
--- a/bn_mp_shrink.c
+++ b/bn_mp_shrink.c
@@ -21,8 +21,9 @@ int mp_shrink (mp_int * a)
   mp_digit *tmp;
   int used = 1;
   
-  if(a->used > 0)
+  if(a->used > 0) {
     used = a->used;
+  }
   
   if (a->alloc != used) {
     if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) {
diff --git a/bn_mp_sqr.c b/bn_mp_sqr.c
index f1d72ef..5167ce0 100644
--- a/bn_mp_sqr.c
+++ b/bn_mp_sqr.c
@@ -29,7 +29,7 @@ mp_sqr (mp_int * a, mp_int * b)
   } else 
 #endif
 #ifdef BN_MP_KARATSUBA_SQR_C
-if (a->used >= KARATSUBA_SQR_CUTOFF) {
+  if (a->used >= KARATSUBA_SQR_CUTOFF) {
     res = mp_karatsuba_sqr (a, b);
   } else 
 #endif
@@ -42,11 +42,13 @@ if (a->used >= KARATSUBA_SQR_CUTOFF) {
       res = fast_s_mp_sqr (a, b);
     } else
 #endif
+    {
 #ifdef BN_S_MP_SQR_C
       res = s_mp_sqr (a, b);
 #else
       res = MP_VAL;
 #endif
+    }
   }
   b->sign = MP_ZPOS;
   return res;
diff --git a/bn_mp_to_signed_bin.c b/bn_mp_to_signed_bin.c
index 0c0149e..2898908 100644
--- a/bn_mp_to_signed_bin.c
+++ b/bn_mp_to_signed_bin.c
@@ -23,7 +23,7 @@ int mp_to_signed_bin (mp_int * a, unsigned char *b)
   if ((res = mp_to_unsigned_bin (a, b + 1)) != MP_OKAY) {
     return res;
   }
-  b[0] = (unsigned char) ((a->sign == MP_ZPOS) ? 0 : 1);
+  b[0] = (a->sign == MP_ZPOS) ? (unsigned char)0 : (unsigned char)1;
   return MP_OKAY;
 }
 #endif
diff --git a/bn_mp_to_unsigned_bin.c b/bn_mp_to_unsigned_bin.c
index 9655b31..132a6ca 100644
--- a/bn_mp_to_unsigned_bin.c
+++ b/bn_mp_to_unsigned_bin.c
@@ -26,7 +26,7 @@ int mp_to_unsigned_bin (mp_int * a, unsigned char *b)
   }
 
   x = 0;
-  while (mp_iszero (&t) == 0) {
+  while (mp_iszero (&t) == MP_NO) {
 #ifndef MP_8BIT
       b[x++] = (unsigned char) (t.dp[0] & 255);
 #else
diff --git a/bn_mp_toom_mul.c b/bn_mp_toom_mul.c
index 3d8ab99..942680d 100644
--- a/bn_mp_toom_mul.c
+++ b/bn_mp_toom_mul.c
@@ -15,28 +15,28 @@
  * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
  */
 
-/* multiplication using the Toom-Cook 3-way algorithm 
+/* multiplication using the Toom-Cook 3-way algorithm
  *
- * Much more complicated than Karatsuba but has a lower 
- * asymptotic running time of O(N**1.464).  This algorithm is 
- * only particularly useful on VERY large inputs 
+ * Much more complicated than Karatsuba but has a lower
+ * asymptotic running time of O(N**1.464).  This algorithm is
+ * only particularly useful on VERY large inputs
  * (we're talking 1000s of digits here...).
 */
 int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
 {
     mp_int w0, w1, w2, w3, w4, tmp1, tmp2, a0, a1, a2, b0, b1, b2;
     int res, B;
-        
+
     /* init temps */
-    if ((res = mp_init_multi(&w0, &w1, &w2, &w3, &w4, 
-                             &a0, &a1, &a2, &b0, &b1, 
+    if ((res = mp_init_multi(&w0, &w1, &w2, &w3, &w4,
+                             &a0, &a1, &a2, &b0, &b1,
                              &b2, &tmp1, &tmp2, NULL)) != MP_OKAY) {
        return res;
     }
-    
+
     /* B */
     B = MIN(a->used, b->used) / 3;
-    
+
     /* a = a2 * B**2 + a1 * B + a0 */
     if ((res = mp_mod_2d(a, DIGIT_BIT * B, &a0)) != MP_OKAY) {
        goto ERR;
@@ -46,13 +46,15 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
        goto ERR;
     }
     mp_rshd(&a1, B);
-    mp_mod_2d(&a1, DIGIT_BIT * B, &a1);
+    if ((res = mp_mod_2d(&a1, DIGIT_BIT * B, &a1)) != MP_OKAY) {
+       goto ERR;
+    }
 
     if ((res = mp_copy(a, &a2)) != MP_OKAY) {
        goto ERR;
     }
     mp_rshd(&a2, B*2);
-    
+
     /* b = b2 * B**2 + b1 * B + b0 */
     if ((res = mp_mod_2d(b, DIGIT_BIT * B, &b0)) != MP_OKAY) {
        goto ERR;
@@ -62,23 +64,23 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
        goto ERR;
     }
     mp_rshd(&b1, B);
-    mp_mod_2d(&b1, DIGIT_BIT * B, &b1);
+    (void)mp_mod_2d(&b1, DIGIT_BIT * B, &b1);
 
     if ((res = mp_copy(b, &b2)) != MP_OKAY) {
        goto ERR;
     }
     mp_rshd(&b2, B*2);
-    
+
     /* w0 = a0*b0 */
     if ((res = mp_mul(&a0, &b0, &w0)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     /* w4 = a2 * b2 */
     if ((res = mp_mul(&a2, &b2, &w4)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     /* w1 = (a2 + 2(a1 + 2a0))(b2 + 2(b1 + 2b0)) */
     if ((res = mp_mul_2(&a0, &tmp1)) != MP_OKAY) {
        goto ERR;
@@ -92,7 +94,7 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
     if ((res = mp_add(&tmp1, &a2, &tmp1)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     if ((res = mp_mul_2(&b0, &tmp2)) != MP_OKAY) {
        goto ERR;
     }
@@ -105,11 +107,11 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
     if ((res = mp_add(&tmp2, &b2, &tmp2)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     if ((res = mp_mul(&tmp1, &tmp2, &w1)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     /* w3 = (a0 + 2(a1 + 2a2))(b0 + 2(b1 + 2b2)) */
     if ((res = mp_mul_2(&a2, &tmp1)) != MP_OKAY) {
        goto ERR;
@@ -123,7 +125,7 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
     if ((res = mp_add(&tmp1, &a0, &tmp1)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     if ((res = mp_mul_2(&b2, &tmp2)) != MP_OKAY) {
        goto ERR;
     }
@@ -136,11 +138,11 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
     if ((res = mp_add(&tmp2, &b0, &tmp2)) != MP_OKAY) {
        goto ERR;
     }
-    
+
     if ((res = mp_mul(&tmp1, &tmp2, &w3)) != MP_OKAY) {
        goto ERR;
     }
-    
+
 
     /* w2 = (a2 + a1 + a0)(b2 + b1 + b0) */
     if ((res = mp_add(&a2, &a1, &tmp1)) != MP_OKAY) {
@@ -158,125 +160,125 @@ int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c)
     if ((res = mp_mul(&tmp1, &tmp2, &w2)) != MP_OKAY) {
        goto ERR;
     }
-    
-    /* now solve the matrix 
-    
+
+    /* now solve the matrix
+
        0  0  0  0  1
        1  2  4  8  16
        1  1  1  1  1
        16 8  4  2  1
        1  0  0  0  0
-       
-       using 12 subtractions, 4 shifts, 
-              2 small divisions and 1 small multiplication 
+
+       using 12 subtractions, 4 shifts,
+              2 small divisions and 1 small multiplication
      */
-     
-     /* r1 - r4 */
-     if ((res = mp_sub(&w1, &w4, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r0 */
-     if ((res = mp_sub(&w3, &w0, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1/2 */
-     if ((res = mp_div_2(&w1, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3/2 */
-     if ((res = mp_div_2(&w3, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r2 - r0 - r4 */
-     if ((res = mp_sub(&w2, &w0, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w4, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - r2 */
-     if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r2 */
-     if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - 8r0 */
-     if ((res = mp_mul_2d(&w0, 3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w1, &tmp1, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - 8r4 */
-     if ((res = mp_mul_2d(&w4, 3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w3, &tmp1, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* 3r2 - r1 - r3 */
-     if ((res = mp_mul_d(&w2, 3, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w1, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w3, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - r2 */
-     if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r2 */
-     if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1/3 */
-     if ((res = mp_div_3(&w1, &w1, NULL)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3/3 */
-     if ((res = mp_div_3(&w3, &w3, NULL)) != MP_OKAY) {
-        goto ERR;
-     }
-     
-     /* at this point shift W[n] by B*n */
-     if ((res = mp_lshd(&w1, 1*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w2, 2*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w3, 3*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w4, 4*B)) != MP_OKAY) {
-        goto ERR;
-     }     
-     
-     if ((res = mp_add(&w0, &w1, c)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&w2, &w3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&w4, &tmp1, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&tmp1, c, c)) != MP_OKAY) {
-        goto ERR;
-     }     
-     
+
+    /* r1 - r4 */
+    if ((res = mp_sub(&w1, &w4, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r0 */
+    if ((res = mp_sub(&w3, &w0, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1/2 */
+    if ((res = mp_div_2(&w1, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3/2 */
+    if ((res = mp_div_2(&w3, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r2 - r0 - r4 */
+    if ((res = mp_sub(&w2, &w0, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w4, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - r2 */
+    if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r2 */
+    if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - 8r0 */
+    if ((res = mp_mul_2d(&w0, 3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w1, &tmp1, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - 8r4 */
+    if ((res = mp_mul_2d(&w4, 3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w3, &tmp1, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* 3r2 - r1 - r3 */
+    if ((res = mp_mul_d(&w2, 3, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w1, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w3, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - r2 */
+    if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r2 */
+    if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1/3 */
+    if ((res = mp_div_3(&w1, &w1, NULL)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3/3 */
+    if ((res = mp_div_3(&w3, &w3, NULL)) != MP_OKAY) {
+       goto ERR;
+    }
+
+    /* at this point shift W[n] by B*n */
+    if ((res = mp_lshd(&w1, 1*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w2, 2*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w3, 3*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w4, 4*B)) != MP_OKAY) {
+       goto ERR;
+    }
+
+    if ((res = mp_add(&w0, &w1, c)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&w2, &w3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&w4, &tmp1, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&tmp1, c, c)) != MP_OKAY) {
+       goto ERR;
+    }
+
 ERR:
-     mp_clear_multi(&w0, &w1, &w2, &w3, &w4, 
-                    &a0, &a1, &a2, &b0, &b1, 
-                    &b2, &tmp1, &tmp2, NULL);
-     return res;
-}     
-     
+    mp_clear_multi(&w0, &w1, &w2, &w3, &w4,
+                   &a0, &a1, &a2, &b0, &b1,
+                   &b2, &tmp1, &tmp2, NULL);
+    return res;
+}
+
 #endif
 
 /* $Source$ */
diff --git a/bn_mp_toom_sqr.c b/bn_mp_toom_sqr.c
index cbee45c..0fe967b 100644
--- a/bn_mp_toom_sqr.c
+++ b/bn_mp_toom_sqr.c
@@ -39,7 +39,9 @@ mp_toom_sqr(mp_int *a, mp_int *b)
        goto ERR;
     }
     mp_rshd(&a1, B);
-    mp_mod_2d(&a1, DIGIT_BIT * B, &a1);
+    if ((res = mp_mod_2d(&a1, DIGIT_BIT * B, &a1)) != MP_OKAY) {
+       goto ERR;
+    }
 
     if ((res = mp_copy(a, &a2)) != MP_OKAY) {
        goto ERR;
@@ -115,108 +117,108 @@ mp_toom_sqr(mp_int *a, mp_int *b)
        using 12 subtractions, 4 shifts, 2 small divisions and 1 small multiplication.
      */
 
-     /* r1 - r4 */
-     if ((res = mp_sub(&w1, &w4, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r0 */
-     if ((res = mp_sub(&w3, &w0, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1/2 */
-     if ((res = mp_div_2(&w1, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3/2 */
-     if ((res = mp_div_2(&w3, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r2 - r0 - r4 */
-     if ((res = mp_sub(&w2, &w0, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w4, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - r2 */
-     if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r2 */
-     if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - 8r0 */
-     if ((res = mp_mul_2d(&w0, 3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w1, &tmp1, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - 8r4 */
-     if ((res = mp_mul_2d(&w4, 3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w3, &tmp1, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* 3r2 - r1 - r3 */
-     if ((res = mp_mul_d(&w2, 3, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w1, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_sub(&w2, &w3, &w2)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1 - r2 */
-     if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3 - r2 */
-     if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r1/3 */
-     if ((res = mp_div_3(&w1, &w1, NULL)) != MP_OKAY) {
-        goto ERR;
-     }
-     /* r3/3 */
-     if ((res = mp_div_3(&w3, &w3, NULL)) != MP_OKAY) {
-        goto ERR;
-     }
-
-     /* at this point shift W[n] by B*n */
-     if ((res = mp_lshd(&w1, 1*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w2, 2*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w3, 3*B)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_lshd(&w4, 4*B)) != MP_OKAY) {
-        goto ERR;
-     }
-
-     if ((res = mp_add(&w0, &w1, b)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&w2, &w3, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&w4, &tmp1, &tmp1)) != MP_OKAY) {
-        goto ERR;
-     }
-     if ((res = mp_add(&tmp1, b, b)) != MP_OKAY) {
-        goto ERR;
-     }
+    /* r1 - r4 */
+    if ((res = mp_sub(&w1, &w4, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r0 */
+    if ((res = mp_sub(&w3, &w0, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1/2 */
+    if ((res = mp_div_2(&w1, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3/2 */
+    if ((res = mp_div_2(&w3, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r2 - r0 - r4 */
+    if ((res = mp_sub(&w2, &w0, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w4, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - r2 */
+    if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r2 */
+    if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - 8r0 */
+    if ((res = mp_mul_2d(&w0, 3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w1, &tmp1, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - 8r4 */
+    if ((res = mp_mul_2d(&w4, 3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w3, &tmp1, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* 3r2 - r1 - r3 */
+    if ((res = mp_mul_d(&w2, 3, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w1, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_sub(&w2, &w3, &w2)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1 - r2 */
+    if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3 - r2 */
+    if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r1/3 */
+    if ((res = mp_div_3(&w1, &w1, NULL)) != MP_OKAY) {
+       goto ERR;
+    }
+    /* r3/3 */
+    if ((res = mp_div_3(&w3, &w3, NULL)) != MP_OKAY) {
+       goto ERR;
+    }
+
+    /* at this point shift W[n] by B*n */
+    if ((res = mp_lshd(&w1, 1*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w2, 2*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w3, 3*B)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_lshd(&w4, 4*B)) != MP_OKAY) {
+       goto ERR;
+    }
+
+    if ((res = mp_add(&w0, &w1, b)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&w2, &w3, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&w4, &tmp1, &tmp1)) != MP_OKAY) {
+       goto ERR;
+    }
+    if ((res = mp_add(&tmp1, b, b)) != MP_OKAY) {
+       goto ERR;
+    }
 
 ERR:
-     mp_clear_multi(&w0, &w1, &w2, &w3, &w4, &a0, &a1, &a2, &tmp1, NULL);
-     return res;
+    mp_clear_multi(&w0, &w1, &w2, &w3, &w4, &a0, &a1, &a2, &tmp1, NULL);
+    return res;
 }
 
 #endif
diff --git a/bn_mp_toradix.c b/bn_mp_toradix.c
index f14fd07..94efc7a 100644
--- a/bn_mp_toradix.c
+++ b/bn_mp_toradix.c
@@ -29,7 +29,7 @@ int mp_toradix (mp_int * a, char *str, int radix)
   }
 
   /* quick out if its zero */
-  if (mp_iszero(a) == 1) {
+  if (mp_iszero(a) == MP_YES) {
      *str++ = '0';
      *str = '\0';
      return MP_OKAY;
@@ -47,7 +47,7 @@ int mp_toradix (mp_int * a, char *str, int radix)
   }
 
   digs = 0;
-  while (mp_iszero (&t) == 0) {
+  while (mp_iszero (&t) == MP_NO) {
     if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
       mp_clear (&t);
       return res;
diff --git a/bn_mp_toradix_n.c b/bn_mp_toradix_n.c
index 173372b..eb8195f 100644
--- a/bn_mp_toradix_n.c
+++ b/bn_mp_toradix_n.c
@@ -56,7 +56,7 @@ int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen)
   }
 
   digs = 0;
-  while (mp_iszero (&t) == 0) {
+  while (mp_iszero (&t) == MP_NO) {
     if (--maxlen < 1) {
        /* no more room */
        break;
diff --git a/tommath.h b/tommath.h
index 0097b5e..16cd023 100644
--- a/tommath.h
+++ b/tommath.h
@@ -25,11 +25,11 @@
 #include <tommath_class.h>
 
 #ifndef MIN
-   #define MIN(x,y) ((x)<(y)?(x):(y))
+   #define MIN(x,y) (((x) < (y)) ? (x) : (y))
 #endif
 
 #ifndef MAX
-   #define MAX(x,y) ((x)>(y)?(x):(y))
+   #define MAX(x,y) (((x) > (y)) ? (x) : (y))
 #endif
 
 #ifdef __cplusplus
@@ -200,7 +200,7 @@ extern int KARATSUBA_MUL_CUTOFF,
 #endif
 
 /* size of comba arrays, should be at least 2 * 2**(BITS_PER_WORD - BITS_PER_DIGIT*2) */
-#define MP_WARRAY               (1 << (sizeof(mp_word) * CHAR_BIT - 2 * DIGIT_BIT + 1))
+#define MP_WARRAY               (1 << (((sizeof(mp_word) * CHAR_BIT) - (2 * DIGIT_BIT)) + 1))
 
 /* the infamous mp_int structure */
 typedef struct  {
@@ -246,9 +246,9 @@ int mp_init_size(mp_int *a, int size);
 
 /* ---> Basic Manipulations <--- */
 #define mp_iszero(a) (((a)->used == 0) ? MP_YES : MP_NO)
-#define mp_iseven(a) (((a)->used > 0 && (((a)->dp[0] & 1) == 0)) ? MP_YES : MP_NO)
-#define mp_isodd(a)  (((a)->used > 0 && (((a)->dp[0] & 1) == 1)) ? MP_YES : MP_NO)
-#define mp_isneg(a)  (((a)->sign) ? MP_YES : MP_NO)
+#define mp_iseven(a) ((((a)->used > 0) && (((a)->dp[0] & 1) == 0)) ? MP_YES : MP_NO)
+#define mp_isodd(a)  ((((a)->used > 0) && (((a)->dp[0] & 1) == 1)) ? MP_YES : MP_NO)
+#define mp_isneg(a)  (((a)->sign != MP_ZPOS) ? MP_YES : MP_NO)
 
 /* set to zero */
 void mp_zero(mp_int *a);
@@ -504,7 +504,7 @@ int mp_exptmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d);
 #endif
 
 /* table of first PRIME_SIZE primes */
-extern const mp_digit ltm_prime_tab[];
+extern const mp_digit ltm_prime_tab[PRIME_SIZE];
 
 /* result=1 if a is divisible by one of the first PRIME_SIZE primes */
 int mp_prime_is_divisible(mp_int *a, int *result);
@@ -639,14 +639,14 @@ int func_name (mp_int * a, type b)                       \
   mp_zero (a);                                           \
                                                          \
   /* set four bits at a time */                          \
-  for (x = 0; x < sizeof(type) * 2; x++) {               \
+  for (x = 0; x < (sizeof(type) * 2); x++) {             \
     /* shift the number up four bits */                  \
     if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) {        \
       return res;                                        \
     }                                                    \
                                                          \
     /* OR in the top four bits of the source */          \
-    a->dp[0] |= (b >> ((sizeof(type)) * 8 - 4)) & 15;    \
+    a->dp[0] |= (b >> ((sizeof(type) * 8) - 4)) & 15;    \
                                                          \
     /* shift the source up to the next four bits */      \
     b <<= 4;                                             \