--- a/libtommath/bn_mp_invmod_slow.c	Wed May 15 21:59:45 2019 +0800
+++ b/libtommath/bn_mp_invmod_slow.c	Mon Sep 16 15:50:38 2019 +0200
@@ -1,4 +1,4 @@
-#include <tommath_private.h>
+#include "tommath_private.h"
 #ifdef BN_MP_INVMOD_SLOW_C
 /* LibTomMath, multiple-precision integer library -- Tom St Denis
  *
@@ -9,167 +9,165 @@
  * Michael Fromberger but has been written from scratch with
  * additional optimizations in place.
  *
- * The library is free for all purposes without any express
- * guarantee it works.
- *
- * Tom St Denis, [email protected], http://libtom.org
+ * SPDX-License-Identifier: Unlicense
  */
 
 /* hac 14.61, pp608 */
-int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c)
+int mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c)
 {
-  mp_int  x, y, u, v, A, B, C, D;
-  int     res;
+   mp_int  x, y, u, v, A, B, C, D;
+   int     res;
 
-  /* b cannot be negative */
-  if ((b->sign == MP_NEG) || (mp_iszero(b) == MP_YES)) {
-    return MP_VAL;
-  }
+   /* b cannot be negative */
+   if ((b->sign == MP_NEG) || (mp_iszero(b) == MP_YES)) {
+      return MP_VAL;
+   }
 
-  /* init temps */
-  if ((res = mp_init_multi(&x, &y, &u, &v, 
-                           &A, &B, &C, &D, NULL)) != MP_OKAY) {
-     return res;
-  }
+   /* init temps */
+   if ((res = mp_init_multi(&x, &y, &u, &v,
+                            &A, &B, &C, &D, NULL)) != MP_OKAY) {
+      return res;
+   }
 
-  /* x = a, y = b */
-  if ((res = mp_mod(a, b, &x)) != MP_OKAY) {
+   /* x = a, y = b */
+   if ((res = mp_mod(a, b, &x)) != MP_OKAY) {
       goto LBL_ERR;
-  }
-  if ((res = mp_copy (b, &y)) != MP_OKAY) {
-    goto LBL_ERR;
-  }
+   }
+   if ((res = mp_copy(b, &y)) != MP_OKAY) {
+      goto LBL_ERR;
+   }
 
-  /* 2. [modified] if x,y are both even then return an error! */
-  if ((mp_iseven (&x) == MP_YES) && (mp_iseven (&y) == MP_YES)) {
-    res = MP_VAL;
-    goto LBL_ERR;
-  }
+   /* 2. [modified] if x,y are both even then return an error! */
+   if ((mp_iseven(&x) == MP_YES) && (mp_iseven(&y) == MP_YES)) {
+      res = MP_VAL;
+      goto LBL_ERR;
+   }
 
-  /* 3. u=x, v=y, A=1, B=0, C=0,D=1 */
-  if ((res = mp_copy (&x, &u)) != MP_OKAY) {
-    goto LBL_ERR;
-  }
-  if ((res = mp_copy (&y, &v)) != MP_OKAY) {
-    goto LBL_ERR;
-  }
-  mp_set (&A, 1);
-  mp_set (&D, 1);
+   /* 3. u=x, v=y, A=1, B=0, C=0,D=1 */
+   if ((res = mp_copy(&x, &u)) != MP_OKAY) {
+      goto LBL_ERR;
+   }
+   if ((res = mp_copy(&y, &v)) != MP_OKAY) {
+      goto LBL_ERR;
+   }
+   mp_set(&A, 1uL);
+   mp_set(&D, 1uL);
 
 top:
-  /* 4.  while u is even do */
-  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) == MP_YES) || (mp_isodd (&B) == MP_YES)) {
-      /* A = (A+y)/2, B = (B-x)/2 */
-      if ((res = mp_add (&A, &y, &A)) != MP_OKAY) {
+   /* 4.  while u is even do */
+   while (mp_iseven(&u) == MP_YES) {
+      /* 4.1 u = u/2 */
+      if ((res = mp_div_2(&u, &u)) != MP_OKAY) {
          goto LBL_ERR;
       }
-      if ((res = mp_sub (&B, &x, &B)) != MP_OKAY) {
+      /* 4.2 if A or B is odd then */
+      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;
+         }
+         if ((res = mp_sub(&B, &x, &B)) != MP_OKAY) {
+            goto LBL_ERR;
+         }
+      }
+      /* A = A/2, B = B/2 */
+      if ((res = mp_div_2(&A, &A)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+      if ((res = mp_div_2(&B, &B)) != MP_OKAY) {
          goto LBL_ERR;
       }
-    }
-    /* A = A/2, B = B/2 */
-    if ((res = mp_div_2 (&A, &A)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-    if ((res = mp_div_2 (&B, &B)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-  }
+   }
 
-  /* 5.  while v is even do */
-  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) == MP_YES) || (mp_isodd (&D) == MP_YES)) {
-      /* C = (C+y)/2, D = (D-x)/2 */
-      if ((res = mp_add (&C, &y, &C)) != MP_OKAY) {
+   /* 5.  while v is even do */
+   while (mp_iseven(&v) == MP_YES) {
+      /* 5.1 v = v/2 */
+      if ((res = mp_div_2(&v, &v)) != MP_OKAY) {
          goto LBL_ERR;
       }
-      if ((res = mp_sub (&D, &x, &D)) != MP_OKAY) {
+      /* 5.2 if C or D is odd then */
+      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;
+         }
+         if ((res = mp_sub(&D, &x, &D)) != MP_OKAY) {
+            goto LBL_ERR;
+         }
+      }
+      /* C = C/2, D = D/2 */
+      if ((res = mp_div_2(&C, &C)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+      if ((res = mp_div_2(&D, &D)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+   }
+
+   /* 6.  if u >= v then */
+   if (mp_cmp(&u, &v) != MP_LT) {
+      /* u = u - v, A = A - C, B = B - D */
+      if ((res = mp_sub(&u, &v, &u)) != MP_OKAY) {
          goto LBL_ERR;
       }
-    }
-    /* C = C/2, D = D/2 */
-    if ((res = mp_div_2 (&C, &C)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-    if ((res = mp_div_2 (&D, &D)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-  }
+
+      if ((res = mp_sub(&A, &C, &A)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+
+      if ((res = mp_sub(&B, &D, &B)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+   } else {
+      /* v - v - u, C = C - A, D = D - B */
+      if ((res = mp_sub(&v, &u, &v)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
 
-  /* 6.  if u >= v then */
-  if (mp_cmp (&u, &v) != MP_LT) {
-    /* u = u - v, A = A - C, B = B - D */
-    if ((res = mp_sub (&u, &v, &u)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
+      if ((res = mp_sub(&C, &A, &C)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+
+      if ((res = mp_sub(&D, &B, &D)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+   }
 
-    if ((res = mp_sub (&A, &C, &A)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
+   /* if not zero goto step 4 */
+   if (mp_iszero(&u) == MP_NO)
+      goto top;
 
-    if ((res = mp_sub (&B, &D, &B)) != MP_OKAY) {
+   /* now a = C, b = D, gcd == g*v */
+
+   /* if v != 1 then there is no inverse */
+   if (mp_cmp_d(&v, 1uL) != MP_EQ) {
+      res = MP_VAL;
       goto LBL_ERR;
-    }
-  } else {
-    /* v - v - u, C = C - A, D = D - B */
-    if ((res = mp_sub (&v, &u, &v)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-
-    if ((res = mp_sub (&C, &A, &C)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
+   }
 
-    if ((res = mp_sub (&D, &B, &D)) != MP_OKAY) {
-      goto LBL_ERR;
-    }
-  }
-
-  /* if not zero goto step 4 */
-  if (mp_iszero (&u) == MP_NO)
-    goto top;
-
-  /* now a = C, b = D, gcd == g*v */
-
-  /* if v != 1 then there is no inverse */
-  if (mp_cmp_d (&v, 1) != MP_EQ) {
-    res = MP_VAL;
-    goto LBL_ERR;
-  }
-
-  /* if its too low */
-  while (mp_cmp_d(&C, 0) == MP_LT) {
+   /* if its too low */
+   while (mp_cmp_d(&C, 0uL) == MP_LT) {
       if ((res = mp_add(&C, b, &C)) != MP_OKAY) {
          goto LBL_ERR;
       }
-  }
-  
-  /* too big */
-  while (mp_cmp_mag(&C, b) != MP_LT) {
+   }
+
+   /* too big */
+   while (mp_cmp_mag(&C, b) != MP_LT) {
       if ((res = mp_sub(&C, b, &C)) != MP_OKAY) {
          goto LBL_ERR;
       }
-  }
-  
-  /* C is now the inverse */
-  mp_exch (&C, c);
-  res = MP_OKAY;
-LBL_ERR:mp_clear_multi (&x, &y, &u, &v, &A, &B, &C, &D, NULL);
-  return res;
+   }
+
+   /* C is now the inverse */
+   mp_exch(&C, c);
+   res = MP_OKAY;
+LBL_ERR:
+   mp_clear_multi(&x, &y, &u, &v, &A, &B, &C, &D, NULL);
+   return res;
 }
 #endif
 
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */