92 lines
3.6 KiB
JavaScript
92 lines
3.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.commitmentsToVersionedHashes = exports.computeVersionedHash = exports.blobsToProofs = exports.blobsToCommitments = exports.getBlobs = void 0;
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const sha256_js_1 = require("ethereum-cryptography/sha256.js");
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const bytes_js_1 = require("./bytes.js");
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/**
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* These utilities for constructing blobs are borrowed from https://github.com/Inphi/eip4844-interop.git
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*/
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const BYTES_PER_FIELD_ELEMENT = 32;
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const FIELD_ELEMENTS_PER_BLOB = 4096;
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const USEFUL_BYTES_PER_BLOB = 32 * FIELD_ELEMENTS_PER_BLOB;
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const MAX_BLOBS_PER_TX = 2;
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const MAX_USEFUL_BYTES_PER_TX = USEFUL_BYTES_PER_BLOB * MAX_BLOBS_PER_TX - 1;
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const BLOB_SIZE = BYTES_PER_FIELD_ELEMENT * FIELD_ELEMENTS_PER_BLOB;
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function get_padded(data, blobs_len) {
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const pdata = new Uint8Array(blobs_len * USEFUL_BYTES_PER_BLOB).fill(0);
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pdata.set(data);
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pdata[data.byteLength] = 0x80;
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return pdata;
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}
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function get_blob(data) {
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const blob = new Uint8Array(BLOB_SIZE);
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for (let i = 0; i < FIELD_ELEMENTS_PER_BLOB; i++) {
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const chunk = new Uint8Array(32);
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chunk.set(data.subarray(i * 31, (i + 1) * 31), 0);
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blob.set(chunk, i * 32);
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}
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return blob;
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}
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const getBlobs = (input) => {
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const data = (0, bytes_js_1.utf8ToBytes)(input);
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const len = data.byteLength;
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if (len === 0) {
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throw Error('invalid blob data');
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}
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if (len > MAX_USEFUL_BYTES_PER_TX) {
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throw Error('blob data is too large');
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}
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const blobs_len = Math.ceil(len / USEFUL_BYTES_PER_BLOB);
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const pdata = get_padded(data, blobs_len);
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const blobs = [];
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for (let i = 0; i < blobs_len; i++) {
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const chunk = pdata.subarray(i * USEFUL_BYTES_PER_BLOB, (i + 1) * USEFUL_BYTES_PER_BLOB);
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const blob = get_blob(chunk);
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blobs.push(blob);
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}
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return blobs;
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};
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exports.getBlobs = getBlobs;
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const blobsToCommitments = (kzg, blobs) => {
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const commitments = [];
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for (const blob of blobs) {
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commitments.push(kzg.blobToKzgCommitment(blob));
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}
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return commitments;
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};
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exports.blobsToCommitments = blobsToCommitments;
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const blobsToProofs = (kzg, blobs, commitments) => {
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const proofs = blobs.map((blob, ctx) => kzg.computeBlobKzgProof(blob, commitments[ctx]));
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return proofs;
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};
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exports.blobsToProofs = blobsToProofs;
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/**
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* Converts a vector commitment for a given data blob to its versioned hash. For 4844, this version
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* number will be 0x01 for KZG vector commitments but could be different if future vector commitment
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* types are introduced
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* @param commitment a vector commitment to a blob
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* @param blobCommitmentVersion the version number corresponding to the type of vector commitment
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* @returns a versioned hash corresponding to a given blob vector commitment
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*/
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const computeVersionedHash = (commitment, blobCommitmentVersion) => {
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const computedVersionedHash = new Uint8Array(32);
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computedVersionedHash.set([blobCommitmentVersion], 0);
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computedVersionedHash.set((0, sha256_js_1.sha256)(commitment).subarray(1), 1);
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return computedVersionedHash;
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};
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exports.computeVersionedHash = computeVersionedHash;
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/**
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* Generate an array of versioned hashes from corresponding kzg commitments
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* @param commitments array of kzg commitments
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* @returns array of versioned hashes
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* Note: assumes KZG commitments (version 1 version hashes)
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*/
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const commitmentsToVersionedHashes = (commitments) => {
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const hashes = [];
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for (const commitment of commitments) {
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hashes.push((0, exports.computeVersionedHash)(commitment, 0x01));
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}
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return hashes;
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};
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exports.commitmentsToVersionedHashes = commitmentsToVersionedHashes;
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//# sourceMappingURL=blobs.js.map
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