Tests added and Comparators

circuits/bitify.circom

@@ -17,6 +17,9 @@
     along with circom. If not, see <https://www.gnu.org/licenses/>.
 */
 
+include "comparators.circom";
+
+
 template Num2Bits(n) {
     signal input in;
     signal output out[n];
@@ -43,3 +46,27 @@ template Bits2Num(n) {
 
     lc1 ==> out;
 }
+
+template Num2BitsNeg(n) {
+    signal input in;
+    signal output out[n];
+    var lc1=0;
+
+    component isZero;
+
+    isZero = IsZero();
+
+    var neg = n == 0 ? 0 : 2**n - in;
+
+    for (var i = 0; i<n; i++) {
+        out[i] <-- (neg >> i) & 1;
+        out[i] * (out[i] -1 ) === 0;
+        lc1 += out[i] * 2**i;
+    }
+
+    in ==> isZero.in;
+
+
+
+    lc1 + isZero.out * 2**n === 2**n - in;
+}

circuits/comparators.circom

@@ -0,0 +1,55 @@
+include "bitify.circom";
+include "binsum.circom";
+
+template IsZero() {
+    signal input in;
+    signal output out;
+
+    signal inv;
+
+    inv <-- in!=0 ? 1/in : 0;
+
+    out <== -in*inv +1;
+    in*out === 0;
+}
+
+
+template IsEqual() {
+    signal input in[2];
+    signal output out;
+
+    component isz = IsZero();
+
+    in[1] - in[0] ==> isz.in;
+
+    isz.out ==> out;
+}
+
+
+// N is the number of bits the input  have.
+// The MSF is the sign bit.
+template LessThan(n) {
+    signal input in[2];
+    signal output out;
+
+    component num2Bits0;
+    component num2Bits1;
+
+    component adder;
+
+    adder = BinSum(n, 2);
+
+    num2Bits0 = Num2Bits(n);
+    num2Bits1 = Num2BitsNeg(n);
+
+    in[0] ==> num2Bits0.in;
+    in[1] ==> num2Bits1.in;
+
+    var i;
+    for (i=0;i<n;i++) {
+        num2Bits0.out[i] ==> adder.in[0][i];
+        num2Bits1.out[i] ==> adder.in[1][i];
+    }
+
+    adder.out[n-1] ==> out;
+}

circuits/sha256/gates.circom

@@ -1,67 +0,0 @@
-/*
-    Copyright 2018 0KIMS association.
-
-    This file is part of circom (Zero Knowledge Circuit Compiler).
-
-    circom is a free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    circom is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
-    License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with circom. If not, see <https://www.gnu.org/licenses/>.
-*/
-
-template XOR() {
-    signal input a;
-    signal input b;
-    signal output out;
-
-    out <== a + b - 2*a*b;
-}
-
-template AND() {
-    signal input a;
-    signal input b;
-    signal output out;
-
-    out <== a*b;
-}
-
-template OR() {
-    signal input a;
-    signal input b;
-    signal output out;
-
-    out <== a + b - a*b;
-}
-
-template NOT() {
-    signal input in;
-    signal output out;
-
-    out <== 1 + in - 2*in;
-}
-
-template NAND() {
-    signal input a;
-    signal input b;
-    signal output out;
-
-    out <== 1 - a*b;
-}
-
-template NOR() {
-    signal input a;
-    signal input b;
-    signal output out;
-
-    out <== a*b + 1 - a - b;
-}
-
-

circuits/sha256/sha256_2.circom

@@ -18,7 +18,7 @@
 */
 
 include "sha256compression.circom";
-include "bitify.circom"
+include "../bitify.circom"
 
 template Sha256_2() {
     signal input a;

circuits/sha256/sha256compression.circom

@@ -20,7 +20,7 @@
 include "constants.circom";
 include "t1.circom";
 include "t2.circom";
-include "binsum.circom";
+include "../binsum.circom";
 include "sigmaplus.circom";
 
 template Sha256compression() {

circuits/sha256/sigmaplus.circom

@@ -17,7 +17,7 @@
     along with circom. If not, see <https://www.gnu.org/licenses/>.
 */
 
-include "binsum.circom"
+include "../binsum.circom"
 include "sigma.circom"
 
 template SigmaPlus() {

circuits/sha256/t1.circom

@@ -17,7 +17,7 @@
     along with circom. If not, see <https://www.gnu.org/licenses/>.
 */
 
-include "binsum.circom";
+include "../binsum.circom";
 include "sigma.circom";
 include "ch.circom";
 

circuits/sha256/t2.circom

@@ -17,7 +17,7 @@
     along with circom. If not, see <https://www.gnu.org/licenses/>.
 */
 
-include "binsum.circom";
+include "../binsum.circom";
 include "sigma.circom";
 include "maj.circom"