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/*jshint node:true */ 'use strict'; var Buffer = require('buffer').Buffer; var crypto = require('crypto'); module.exports = bufferEq; /** * Constant-time buffer comparison. * * Uses crypto.timingSafeEqual when available (Node.js >= 6.6.0). * Falls back to manual XOR comparison for older versions. * * @param {Buffer} a - First buffer * @param {Buffer} b - Second buffer * @returns {boolean} - True if buffers are equal */ function bufferEq(a, b) { // Type check is necessary for correctness if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) { return false; } // Buffer sizes should be well-known information, so this is safe if (a.length !== b.length) { return false; } // Use native timing-safe comparison (available since Node.js 6.6.0) if (crypto.timingSafeEqual) { return crypto.timingSafeEqual(a, b); } // Fallback for very old Node.js versions (should never be reached in practice) var c = 0; for (var i = 0; i < a.length; i++) { c |= a[i] ^ b[i]; } return c === 0; } // Deprecated methods - kept for API compatibility but are now no-ops // The original implementation modified Buffer.prototype which is unsafe bufferEq.install = function() { // No-op - modifying Buffer.prototype is deprecated }; bufferEq.restore = function() { // No-op - modifying Buffer.prototype is deprecated };