@chainsafe/persistent-merkle-tree/lib/hasher/noble.js

Merkle tree implemented as a persistent datastructure

import { sha256 } from "@noble/hashes/sha256";
import { digest64HashObjects, byteArrayIntoHashObject } from "@chainsafe/as-sha256";
import { BLOCK_SIZE, doDigestNLevel, doMerkleizeBlockArray, doMerkleizeBlocksBytes, hashObjectToUint8Array, } from "./util.js";
const digest64 = (a, b) => sha256.create().update(a).update(b).digest();
const hashInto = (input, output) => {
    if (input.length % 64 !== 0) {
        throw new Error(`Invalid input length ${input.length}`);
    }
    if (input.length !== output.length * 2) {
        throw new Error(`Invalid output length ${output.length}`);
    }
    const count = Math.floor(input.length / 64);
    for (let i = 0; i < count; i++) {
        const offset = i * 64;
        const in1 = input.subarray(offset, offset + 32);
        const in2 = input.subarray(offset + 32, offset + 64);
        const out = digest64(in1, in2);
        output.set(out, i * 32);
    }
};
/** should be multiple of 64, make it the same to as-sha256 */
const buffer = new Uint8Array(4 * BLOCK_SIZE);
export const hasher = {
    name: "noble",
    digest64,
    digest64HashObjects: (left, right, parent) => {
        byteArrayIntoHashObject(digest64(hashObjectToUint8Array(left), hashObjectToUint8Array(right)), 0, parent);
    },
    merkleizeBlocksBytes(blocksBytes, padFor, output, offset) {
        return doMerkleizeBlocksBytes(blocksBytes, padFor, output, offset, hashInto);
    },
    merkleizeBlockArray(blocks, blockLimit, padFor, output, offset) {
        return doMerkleizeBlockArray(blocks, blockLimit, padFor, output, offset, hashInto, buffer);
    },
    digestNLevel(data, nLevel) {
        return doDigestNLevel(data, nLevel, hashInto);
    },
    executeHashComputations: (hashComputations) => {
        for (let level = hashComputations.length - 1; level >= 0; level--) {
            const hcArr = hashComputations[level];
            if (!hcArr) {
                // should not happen
                throw Error(`no hash computations for level ${level}`);
            }
            for (const hc of hcArr) {
                hc.dest.applyHash(digest64HashObjects(hc.src0, hc.src1));
            }
        }
    },
};
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