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128 lines
3.5 KiB

// Copyright (c) 2018 Jordi Baylina
// License: LGPL-3.0+
//
const Web3Utils = require("web3-utils");
const Contract = require("./evmasm");
function createCode(seed, n) {
let ci = Web3Utils.keccak256(seed);
const C = new Contract();
C.push(0x64);
C.push("0x00");
C.push("0x00");
C.calldatacopy();
C.push("0x0100000000000000000000000000000000000000000000000000000000");
C.push("0x00");
C.mload();
C.div();
C.push("0x3f1a1187"); // MiMCSponge(uint256,uint256,uint256)
C.eq();
C.jmpi("start");
C.invalid();
C.label("start");
C.push("0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001"); // q
C.push("0x44");
C.mload(); // k q
C.push("0x04");
C.mload(); // xL k q
C.dup(2); // q xL k q
C.push("0x24");
C.mload(); // xR q xL k q
C.dup(1); // q xR q xL k q
C.dup(0); // q q xR q xL k q
C.dup(4); // xL q q xR q xL k q
C.dup(6); // k xL q q xR q xL k q
C.addmod(); // t=k+xL q xR q xL k q
C.dup(1); // q t q xR q xL k q
C.dup(0); // q q t q xR q xL k q
C.dup(2); // t q q t q xR q xL k q
C.dup(0); // t t q q t q xR q xL k q
C.mulmod(); // b=t^2 q t q xR q xL k q
C.dup(0); // b b q t q xR q xL k q
C.mulmod(); // c=t^4 t q xR q xL k q
C.mulmod(); // d=t^5 xR q xL k q
C.addmod(); // e=t^5+xR xL k q (for next round: xL xR k q)
for (let i=0; i<n-1; i++) {
if (i < n-2) {
ci = Web3Utils.keccak256(ci);
} else {
ci = "0x00";
}
C.swap(1); // xR xL k q
C.dup(3); // q xR xL k q
C.dup(3); // k q xR xL k q
C.dup(1); // q k q xR xL k q
C.dup(4); // xL q k q xR xL k q
C.push(ci); // ci xL q k q xR xL k q
C.addmod(); // a=ci+xL k q xR xL k q
C.addmod(); // t=a+k xR xL k q
C.dup(4); // q t xR xL k q
C.swap(1); // t q xR xL k q
C.dup(1); // q t q xR xL k q
C.dup(0); // q q t q xR xL k q
C.dup(2); // t q q t q xR xL k q
C.dup(0); // t t q q t q xR xL k q
C.mulmod(); // b=t^2 q t q xR xL k q
C.dup(0); // b b q t q xR xL k q
C.mulmod(); // c=t^4 t q xR xL k q
C.mulmod(); // d=t^5 xR xL k q
C.dup(4); // q d xR xL k q
C.swap(2); // xR d q xL k q
C.addmod(); // e=t^5+xR xL k q (for next round: xL xR k q)
}
C.push("0x20");
C.mstore(); // Save it to pos 0;
C.push("0x00");
C.mstore(); // Save it to pos 1;
C.push("0x40");
C.push("0x00");
C.return();
return C.createTxData();
}
module.exports.abi = [
{
"constant": true,
"inputs": [
{
"name": "xL_in",
"type": "uint256"
},
{
"name": "xR_in",
"type": "uint256"
},
{
"name": "k",
"type": "uint256"
}
],
"name": "MiMCSponge",
"outputs": [
{
"name": "xL",
"type": "uint256"
},
{
"name": "xR",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "pure",
"type": "function"
}
];
module.exports.createCode = createCode;