circomlib/circuits/sha256/sigma.circom
2018-12-06 17:32:49 +01:00

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/*
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 "xor3.circom";
include "rotate.circom";
include "shift.circom";
template SmallSigma(ra, rb, rc) {
signal input in[32];
signal output out[32];
component xor3 = Xor3(32);
component rota = RotR(32, ra);
component rotb = RotR(32, rb);
component shrc = ShR(32, rc);
for (var k=0; k<32; k++) {
rota.in[k] <== in[k];
rotb.in[k] <== in[k];
shrc.in[k] <== in[k];
xor3.a[k] <== rota.out[k];
xor3.b[k] <== rotb.out[k];
xor3.c[k] <== shrc.out[k];
out[k] <== xor3.out[k];
}
}
template BigSigma(ra, rb, rc) {
signal input in[32];
signal output out[32];
component xor3 = Xor3(32);
component rota = RotR(32, ra);
component rotb = RotR(32, rb);
component rotc = RotR(32, rc);
for (var k=0; k<32; k++) {
rota.in[k] <== in[k];
rotb.in[k] <== in[k];
rotc.in[k] <== in[k];
xor3.a[k] <== rota.out[k];
xor3.b[k] <== rotb.out[k];
xor3.c[k] <== rotc.out[k];
out[k] <== xor3.out[k];
}
}