@reclaimprotocol/zk-symmetric-crypto/lib/config.js

JS Wrappers for Various ZK Snark Circuits

import { crypto } from '@reclaimprotocol/tls';
import { bitsToUint8Array, bitsToUintArray, toUint8Array, toUintArray, uint8ArrayToBits, uintArrayToBits } from "./utils.js";
// commit hash for this repo
export const GIT_COMMIT_HASH = '7e9026fd556fb68e5268e0237b8d3d6c8ea9f4b1';
export const CONFIG = {
    'chacha20': {
        index: 0,
        chunkSize: 32,
        bitsPerWord: 32,
        keySizeBytes: 32,
        ivSizeBytes: 12,
        startCounter: 1,
        // num of blocks per chunk
        blocksPerChunk: 2,
        // chacha20 circuit uses LE encoding
        isLittleEndian: true,
        uint8ArrayToBits: (arr) => (uintArrayToBits(toUintArray(arr)).flat()),
        bitsToUint8Array: (bits) => {
            const arr = bitsToUintArray(bits);
            return toUint8Array(arr);
        },
        encrypt: makeAuthenticatedEncrypt('CHACHA20-POLY1305')
    },
    'aes-256-ctr': {
        index: 2,
        chunkSize: 80,
        bitsPerWord: 8,
        keySizeBytes: 32,
        ivSizeBytes: 12,
        startCounter: 2,
        // num of blocks per chunk
        blocksPerChunk: 5,
        // AES circuit uses BE encoding
        isLittleEndian: false,
        uint8ArrayToBits,
        bitsToUint8Array,
        encrypt: makeAuthenticatedEncrypt('AES-256-GCM')
    },
    'aes-128-ctr': {
        index: 1,
        chunkSize: 80,
        bitsPerWord: 8,
        keySizeBytes: 16,
        ivSizeBytes: 12,
        startCounter: 2,
        // num of blocks per chunk
        blocksPerChunk: 5,
        // AES circuit uses BE encoding
        isLittleEndian: false,
        uint8ArrayToBits,
        bitsToUint8Array,
        encrypt: makeAuthenticatedEncrypt('AES-128-GCM')
    },
};
function makeAuthenticatedEncrypt(alg) {
    return async ({ key, iv, in: data }) => {
        const impKey = await crypto.importKey(alg, key);
        const { ciphertext } = await crypto.authenticatedEncrypt(alg, {
            key: impKey,
            iv,
            data,
            aead: new Uint8Array(0),
        });
        return ciphertext.slice(0, data.length);
    };
}