onion-core/dist/lib/util/buffer_xor.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.buffersXOR = exports.bufferXOR = void 0;
const buffer_1 = require("buffer");
// Often in the code, when we want to calculate a content-based ID, where the content is an unordered set, we compute the XOR of the content-based IDs of the set elements. This is because XOR is insensitive to order.
// Precondition that is NOT CHECKED: buffers must be of equal length
// Returns new buffer that is bitwise XOR of inputs.
function bufferXOR(a, b) {
    const result = buffer_1.Buffer.allocUnsafe(a.length);
    for (let i = 0; i < a.length; i += 4) {
        // Little endian is fastest, because native to Intel CPUs
        result.writeInt32LE(a.readInt32LE(i) ^ b.readInt32LE(i), i);
    }
    return result;
}
exports.bufferXOR = bufferXOR;
function buffersXOR(...args) {
    return args.reduce((a, b) => bufferXOR(a, b), buffer_1.Buffer.alloc(32));
}
exports.buffersXOR = buffersXOR;
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