Merge other basic circuits here

circuits/sha256/ch.circom

@@ -0,0 +1,46 @@
+/*
+    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/>.
+*/
+
+/* Ch
+
+000 0
+001 1
+010 0
+011 1
+100 0
+101 0
+110 1
+111 1
+
+out = a&b ^ (!a)&c =>
+
+out = a*(b-c) + c
+
+*/
+
+template Ch(n) {
+    signal input a[n];
+    signal input b[n];
+    signal input c[n];
+    signal output out[n];
+
+    for (var k=0; k<n; k++) {
+        out[k] <== a[k] * (b[k]-c[k]) + c[k];
+    }
+}