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a/CCTF_Solutions_main/frontend/package.json b/CCTF_Solutions_main/frontend/package.json new file mode 100644 index 0000000..511072c --- /dev/null +++ b/CCTF_Solutions_main/frontend/package.json @@ -0,0 +1,6 @@ +{ + "dependencies": { + "crypto-js": "^4.1.1", + "zokrates-js": "^1.1.4" + } +} diff --git a/CCTF_Solutions_main/frontend/proving.key b/CCTF_Solutions_main/frontend/proving.key new file mode 100644 index 0000000..8030e06 Binary files /dev/null and b/CCTF_Solutions_main/frontend/proving.key differ diff --git a/CCTF_Solutions_main/frontend/sendflag.html b/CCTF_Solutions_main/frontend/sendflag.html index fb381a1..f40316f 100644 --- a/CCTF_Solutions_main/frontend/sendflag.html +++ b/CCTF_Solutions_main/frontend/sendflag.html @@ -7,6 +7,7 @@ + @@ -29,12 +30,12 @@

Send the flag

-
+
- +
diff --git a/CCTF_Solutions_main/frontend/src/main.mjs b/CCTF_Solutions_main/frontend/src/main.mjs new file mode 100644 index 0000000..15f4c64 --- /dev/null +++ b/CCTF_Solutions_main/frontend/src/main.mjs @@ -0,0 +1,110 @@ +import sha256 from 'crypto-js/sha256.js'; +import { initialize } from 'zokrates-js'; + +const ZEROSTR = '0'; + +/* Converts a string into a stringified hexadecimal number */ +function str2hex(string) { + return string.split('') + .map(c => c.charCodeAt(0).toString(16).padStart(2, '0')) + .join(''); +} + +/* Converts a stringified hexadecimal number into a string */ +function hex2str(hex) { + return hex.split(/(\w\w)/g) + .filter(p => !!p) + .map(c => String.fromCharCode(parseInt(c, 16))) + .join(''); +} + +/* Prefix each element of a string a array with 0x */ +function map_0xprefix(arr) { + return arr.map(s => '0x' + s); +} + +/* Convert a string to a byte array */ +function str2asciiarr(s) { + let charCodeArr = []; + for (let i = 0; i < s.length; i++) { + let code = s.charCodeAt(i); + charCodeArr.push(code); + } + + return charCodeArr; +} + +/* Convert a byte array to a string */ +function asciiarr2str(arr) { + return String.fromCharCode(...arr); +} + + +/* + * Expand a simple number into a stringified u32[8] array for ZoKrates. + */ +function expand_number(number) { + const revstr = s => Array.from(s).reverse().join(''); + const split8 = s => s.match(/.{1,8}/g); + const parts = split8(revstr(number.toString(16))) + .map(p => '0x' + revstr(p)) + .map(p => parseInt(p, 16).toString()) + .reverse(); + + return [...Array(8 - parts.length).fill(ZEROSTR), ...parts]; +} + + +/* Hard coded zokrates program source code */ +const zokSrc = ` +import "hashes/sha256/sha256Padded.zok" as sha256; +from "utils/casts.zok" import cast; + +def main(public u32[8] hash,public u32[5] address,private u8[64] flag){ + u8[20] addr8 = cast(address); + u32[8] genHash = sha256(flag); + log("Hash: {} {} {} {} {} {} {} {}",genHash[0],genHash[1],genHash[2],genHash[3],genHash[4],genHash[5],genHash[6],genHash[7]); + assert(genHash == hash); + return; +} +`; + + +/* Get the proving key from the local server */ +const PROVING_KEY_URI = 'http://localhost:8080/proving.key'; +const proving_key = await (await fetch(PROVING_KEY_URI)).text(); + +function submitFlag(flag) { + initialize().then((defaultProvider) => { + const zokProvider = defaultProvider.withOptions({ + backend: 'ark', + scheme: 'gm17', + }); + + const artefacts = zokProvider.compile(zokSrc); + + const flag_ascii = str2asciiarr(flag); + const flag_ascii_padded = flag_ascii.concat(new Array(64 - flag_ascii.length).fill(0)); + const flag_padded = asciiarr2str(flag_ascii_padded); + + const hash = sha256(flag_padded).toString(); /* TODO get this from contract */ + const addr = 'f6e3a49fca2eb57f286d516fa60154ebfd10d5ad'; /* TODO get this from metamask */ + + const flag_split = map_0xprefix(str2hex(flag).match(/.{1,2}/g)); + const flag_split_padded = flag_split.concat(new Array(64 - flag_split.length).fill('0x0')); + const hash_split = map_0xprefix(hash.match(/.{1,8}/g)); + const addr_split = map_0xprefix(addr.match(/.{1,8}/g)); + + // witness computation + const { witness, output } = zokProvider.computeWitness(artefacts, [hash_split, addr_split, flag_split_padded]); + + // generate proof + const proof = zokProvider.generateProof(artefacts.program, witness, proving_key); + + console.log(proof); + }); +} + +document.getElementById('submitFlagBtn').addEventListener('click', () => { + submitFlag(document.getElementById('flagbox').value); +}); diff --git a/CCTF_Solutions_main/frontend/webpack.config.js b/CCTF_Solutions_main/frontend/webpack.config.js new file mode 100644 index 0000000..7d02985 --- /dev/null +++ b/CCTF_Solutions_main/frontend/webpack.config.js @@ -0,0 +1,16 @@ +const path = require('path'); + +module.exports = { + entry: './src/main.mjs', + output: { + path: path.resolve(__dirname, 'dist'), + filename: 'bundle.js', + }, + experiments: { + syncWebAssembly: true, + topLevelAwait: true, + }, + resolve: { + fullySpecified: false, + }, +};