@iden3/js-merkletree/dist/node/esm/lib/utils/node.js

javascript sparse merkle tree library

// LeafKey computes the key of a leaf node given the hIndex and hValue of the
// entry of the leaf.
import { hashElemsKey } from '../hash/hash';
import { NODE_VALUE_BYTE_ARR_LENGTH } from '../../constants';
import { bigIntToUINT8Array } from './bigint';
export const leafKey = async (k, v) => {
    return hashElemsKey(BigInt(1), [k.bigInt(), v.bigInt()]);
};
export const nodeValue = (type, a, b) => {
    const bytes = new Uint8Array(NODE_VALUE_BYTE_ARR_LENGTH);
    const kBytes = bigIntToUINT8Array(a.bigInt());
    const vBytes = bigIntToUINT8Array(b.bigInt());
    bytes[0] = type;
    for (let idx = 1; idx < 33; idx += 1) {
        bytes[idx] = kBytes[idx - 1];
    }
    for (let idx = 33; idx <= NODE_VALUE_BYTE_ARR_LENGTH; idx += 1) {
        bytes[idx] = vBytes[idx - 33];
    }
    return bytes;
};