Poseidon in SMT

circuits/smt/smthash_poseidon.circom

@@ -0,0 +1,56 @@
+/*
+    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/>.
+*/
+
+include "../poseidon.circom";
+
+
+/*
+    Hash1 = H(1 | key | value)
+ */
+
+template SMTHash1() {
+    signal input key;
+    signal input value;
+    signal output out;
+
+    component h = Poseidon(3, 6, 8, 57);   // Constant
+    h.inputs[0] <== key;
+    h.inputs[1] <== value;
+    h.inputs[2] <== 1;
+
+    out <== h.out;
+}
+
+/*
+    This component is used to create the 2 nodes.
+
+    Hash2 = H(Hl | Hr)
+ */
+
+template SMTHash2() {
+    signal input L;
+    signal input R;
+    signal output out;
+
+    component h = Poseidon(2, 6, 8, 57);   // Constant
+    h.inputs[0] <== L;
+    h.inputs[1] <== R;
+
+    out <== h.out;
+}

circuits/smt/smtprocessor.circom

@@ -135,7 +135,7 @@ include "../switcher.circom";
 include "smtlevins.circom";
 include "smtprocessorlevel.circom";
 include "smtprocessorsm.circom";
-include "smthash.circom";
+include "smthash_poseidon.circom";
 
 template SMTProcessor(nLevels) {
     signal input oldRoot;

circuits/smt/smtverifier.circom

@@ -35,7 +35,7 @@ include "../switcher.circom";
 include "smtlevins.circom";
 include "smtverifierlevel.circom";
 include "smtverifiersm.circom";
-include "smthash.circom";
+include "smthash_poseidon.circom";
 
 template SMTVerifier(nLevels) {
     signal input enabled;