did-jwt/lib.commonjs/Digest.js

Library for Signing and Verifying JWTs that use DIDs as issuers and JWEs that use DIDs as recipients

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.keccak = exports.ripemd160 = void 0;
exports.sha256 = sha256;
exports.toEthereumAddress = toEthereumAddress;
exports.concatKDF = concatKDF;
const sha2_js_1 = require("@noble/hashes/sha2.js");
const sha3_js_1 = require("@noble/hashes/sha3.js");
const uint8arrays_1 = require("uint8arrays");
var legacy_js_1 = require("@noble/hashes/legacy.js");
Object.defineProperty(exports, "ripemd160", { enumerable: true, get: function () { return legacy_js_1.ripemd160; } });
function sha256(payload) {
    const data = typeof payload === 'string' ? (0, uint8arrays_1.fromString)(payload) : payload;
    return (0, sha2_js_1.sha256)(data);
}
exports.keccak = sha3_js_1.keccak_256;
function toEthereumAddress(hexPublicKey) {
    const hashInput = (0, uint8arrays_1.fromString)(hexPublicKey.slice(2), 'base16');
    return `0x${(0, uint8arrays_1.toString)((0, exports.keccak)(hashInput).slice(-20), 'base16')}`;
}
function writeUint32BE(value, array = new Uint8Array(4)) {
    const encoded = (0, uint8arrays_1.fromString)(value.toString(), 'base10');
    array.set(encoded, 4 - encoded.length);
    return array;
}
const lengthAndInput = (input) => (0, uint8arrays_1.concat)([writeUint32BE(input.length), input]);
// This implementation of concatKDF was inspired by these two implementations:
// https://github.com/digitalbazaar/minimal-cipher/blob/master/algorithms/ecdhkdf.js
// https://github.com/panva/jose/blob/master/lib/jwa/ecdh/derive.js
function concatKDF(secret, keyLen, alg, producerInfo, consumerInfo) {
    if (keyLen !== 256)
        throw new Error(`Unsupported key length: ${keyLen}`);
    const value = (0, uint8arrays_1.concat)([
        lengthAndInput((0, uint8arrays_1.fromString)(alg)),
        lengthAndInput(typeof producerInfo === 'undefined' ? new Uint8Array(0) : producerInfo), // apu
        lengthAndInput(typeof consumerInfo === 'undefined' ? new Uint8Array(0) : consumerInfo), // apv
        writeUint32BE(keyLen),
    ]);
    // since our key lenght is 256 we only have to do one round
    const roundNumber = 1;
    return sha256((0, uint8arrays_1.concat)([writeUint32BE(roundNumber), secret, value]));
}
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