fortify2-js
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MOST POWERFUL JavaScript Security Library! Military-grade cryptography + 19 enhanced object methods + quantum-resistant algorithms + perfect TypeScript support. More powerful than Lodash with built-in security.
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JavaScript
'use strict';
var crypto = require('crypto');
var secureMemory = require('../types/secure-memory.js');
var buffer_const = require('../const/buffer.const.js');
var secureMem_type = require('../types/secure-mem.type.js');
function _interopNamespaceDefault(e) {
var n = Object.create(null);
if (e) {
Object.keys(e).forEach(function (k) {
if (k !== 'default') {
var d = Object.getOwnPropertyDescriptor(e, k);
Object.defineProperty(n, k, d.get ? d : {
enumerable: true,
get: function () { return e[k]; }
});
}
});
}
n.default = e;
return Object.freeze(n);
}
var crypto__namespace = /*#__PURE__*/_interopNamespaceDefault(crypto);
/**
* This module provides military-grade utilities for securely handling sensitive data in memory:
* - Secure buffers with advanced protection against memory dumps and swapping
* - Multiple encryption layers for data at rest in memory
* - Hardware-level security features when available
* - Protection against cold boot attacks and memory forensics
* - Canary tokens for tamper detection
* - Memory fragmentation and obfuscation techniques
* - Quantum-resistant security measures
* - Side-channel attack resistance
*/
/**
* @author Seth Eleazar
*
* @license MIT
* @description Enhanced Secure Memory Management Module
* Enhanced secure buffer with military-grade protection
* Features multiple layers of security including encryption, obfuscation, and tamper detection
*/
class SecureBuffer {
/**
* Creates a new enhanced secure buffer with military-grade protection
*
* @param size - Size of the buffer in bytes
* @param fill - Optional value to fill the buffer with
* @param options - Security options
*/
constructor(size, fill, options = {}) {
this.fragments = [];
this.encryptionKey = null;
this.nonce = null;
this.canaryTokens = [];
this.canaryPositions = []; // Track where canaries are embedded
this.obfuscationMask = null;
this.state = secureMemory.BufferState.UNINITIALIZED;
this.accessCount = 0;
this.lastAccess = Date.now();
this.lockTimer = null;
this.checksum = null;
this.originalSize = size;
this.options = {
protectionLevel: options.protectionLevel || secureMemory.MemoryProtectionLevel.ENHANCED,
enableEncryption: options.enableEncryption ?? true,
enableFragmentation: options.enableFragmentation ?? true,
enableCanaries: options.enableCanaries ?? true,
enableObfuscation: options.enableObfuscation ?? true,
autoLock: options.autoLock ?? true,
lockTimeout: options.lockTimeout || 300000, // 5 minutes
quantumSafe: options.quantumSafe || false,
};
this.protectionLevel = this.options.protectionLevel;
// Initialize synchronously without waiting for optional libraries
this.initializeSecureBuffer(size, fill);
this.registerFinalizer();
this.setupAutoLock();
// Initialize libraries asynchronously in background (non-blocking)
secureMem_type.ensureLibrariesInitialized().catch(() => {
// Ignore errors - libraries are optional
});
}
/**
* Initialize the secure buffer with enhanced protection
*/
initializeSecureBuffer(size, fill) {
// Generate encryption key if encryption is enabled
if (this.options.enableEncryption) {
this.encryptionKey = this.generateSecureKey(buffer_const.BUFFER_SECURITY_CONSTANTS.ENCRYPTION_KEY_SIZE);
this.nonce = this.generateSecureKey(buffer_const.BUFFER_SECURITY_CONSTANTS.NONCE_SIZE);
}
// Create fragments if fragmentation is enabled
if (this.options.enableFragmentation &&
size > buffer_const.BUFFER_SECURITY_CONSTANTS.FRAGMENT_SIZE) {
this.createFragments(size, fill);
}
else {
// Single fragment for small buffers
this.fragments = [new Uint8Array(size)];
if (fill !== undefined) {
this.fragments[0].fill(fill);
}
}
// Generate canary tokens if enabled
if (this.options.enableCanaries) {
this.generateCanaryTokens();
}
// Create obfuscation mask if enabled
if (this.options.enableObfuscation) {
this.obfuscationMask = this.generateSecureKey(size);
}
// Calculate initial checksum
this.updateChecksum();
this.state = secureMemory.BufferState.ACTIVE;
}
/**
* Setup automatic locking mechanism
*/
setupAutoLock() {
if (this.options.autoLock) {
this.resetLockTimer();
}
}
/**
* Reset the auto-lock timer
*/
resetLockTimer() {
if (this.lockTimer) {
clearTimeout(this.lockTimer);
}
this.lockTimer = setTimeout(() => {
this.lock();
}, this.options.lockTimeout);
}
/**
* Generate a cryptographically secure key
*/
generateSecureKey(size) {
// Try to use libsodium if available and properly initialized
if (secureMem_type.sodium && secureMem_type.libraryStatus.sodium) {
try {
return secureMem_type.sodium.randombytes_buf(size);
}
catch (error) {
console.warn("libsodium randombytes_buf failed:", error.message);
}
}
// Fallback to Node.js crypto
try {
return new Uint8Array(crypto__namespace.randomBytes(size));
}
catch (e) {
console.warn("crypto.randomBytes failed:", e.message);
// Ultimate fallback
const key = new Uint8Array(size);
for (let i = 0; i < size; i++) {
key[i] = Math.floor(Math.random() * 256);
}
return key;
}
}
/**
* Create memory fragments for enhanced security
*/
createFragments(size, fill) {
const fragmentCount = Math.min(Math.ceil(size / buffer_const.BUFFER_SECURITY_CONSTANTS.FRAGMENT_SIZE), buffer_const.BUFFER_SECURITY_CONSTANTS.MAX_FRAGMENTS);
this.fragments = [];
let remaining = size;
for (let i = 0; i < fragmentCount; i++) {
const fragmentSize = Math.min(remaining, buffer_const.BUFFER_SECURITY_CONSTANTS.FRAGMENT_SIZE);
const fragment = new Uint8Array(fragmentSize);
if (fill !== undefined) {
fragment.fill(fill);
}
this.fragments.push(fragment);
remaining -= fragmentSize;
if (remaining <= 0)
break;
}
}
/**
* Generate canary tokens for tamper detection and embed them in memory
*/
generateCanaryTokens() {
const canaryCount = Math.max(2, Math.min(8, Math.ceil(this.fragments.length / 4)));
this.canaryTokens = [];
this.canaryPositions = [];
for (let i = 0; i < canaryCount; i++) {
const canary = this.generateSecureKey(buffer_const.BUFFER_SECURITY_CONSTANTS.CANARY_SIZE);
this.canaryTokens.push(canary);
// Embed canary in memory around fragments
this.embedCanaryInMemory(canary, i);
}
}
/**
* Embed canary tokens in memory around buffer fragments
*/
embedCanaryInMemory(canary, index) {
if (this.fragments.length === 0)
return;
// Calculate position to embed canary
// Distribute canaries evenly around fragments
const fragmentIndex = index % this.fragments.length;
const fragment = this.fragments[fragmentIndex];
// Create a new fragment with canary embedded
// Format: [canary_prefix][original_data][canary_suffix]
const canaryPrefix = canary.slice(0, Math.floor(canary.length / 2));
const canarySuffix = canary.slice(Math.floor(canary.length / 2));
const newFragment = new Uint8Array(canaryPrefix.length + fragment.length + canarySuffix.length);
// Embed canary around the data
newFragment.set(canaryPrefix, 0);
newFragment.set(fragment, canaryPrefix.length);
newFragment.set(canarySuffix, canaryPrefix.length + fragment.length);
// Replace the original fragment
this.fragments[fragmentIndex] = newFragment;
// Track the position for verification
this.canaryPositions.push(fragmentIndex);
}
/**
* Helper method to compare two Uint8Arrays for equality
*/
arraysEqual(a, b) {
if (a.length !== b.length)
return false;
for (let i = 0; i < a.length; i++) {
if (a[i] !== b[i])
return false;
}
return true;
}
/**
* Get the unencrypted buffer by combining fragments (extracting data from canary-embedded fragments)
*/
getUnencryptedBuffer() {
if (this.fragments.length === 0) {
return new Uint8Array(0);
}
const extractedFragments = [];
// Extract actual data from fragments, removing embedded canaries
for (let i = 0; i < this.fragments.length; i++) {
const fragment = this.fragments[i];
// Check if this fragment has embedded canaries
const canaryIndex = this.canaryPositions.indexOf(i);
if (canaryIndex >= 0 && canaryIndex < this.canaryTokens.length) {
// This fragment has embedded canaries, extract the original data
const canary = this.canaryTokens[canaryIndex];
const canaryPrefix = canary.slice(0, Math.floor(canary.length / 2));
const canarySuffix = canary.slice(Math.floor(canary.length / 2));
// Extract the original data between the canaries
const originalDataStart = canaryPrefix.length;
const originalDataEnd = fragment.length - canarySuffix.length;
const originalData = fragment.slice(originalDataStart, originalDataEnd);
extractedFragments.push(originalData);
}
else {
// No canaries in this fragment, use as-is
extractedFragments.push(fragment);
}
}
// Calculate total size of extracted data
const totalSize = extractedFragments.reduce((sum, fragment) => sum + fragment.length, 0);
const result = new Uint8Array(totalSize);
// Combine extracted fragments
let offset = 0;
for (const fragment of extractedFragments) {
result.set(fragment, offset);
offset += fragment.length;
}
return result;
}
/**
* Lock the buffer to prevent access
*/
lock() {
if (this.state === secureMemory.BufferState.DESTROYED) {
throw new Error("Cannot lock destroyed buffer");
}
this.state = secureMemory.BufferState.LOCKED;
// Encrypt fragments if encryption is enabled
if (this.options.enableEncryption && this.encryptionKey && this.nonce) {
this.encryptFragments();
}
}
/**
* Unlock the buffer to allow access
*/
unlock() {
if (this.state === secureMemory.BufferState.DESTROYED) {
throw new Error("Cannot unlock destroyed buffer");
}
// Decrypt fragments if they were encrypted
if (this.options.enableEncryption && this.encryptionKey && this.nonce) {
this.decryptFragments();
}
this.state = secureMemory.BufferState.ACTIVE;
this.resetLockTimer();
}
/**
* Check if buffer is locked
*/
isLocked() {
return this.state === secureMemory.BufferState.LOCKED;
}
/**
* Check if buffer is destroyed
*/
isDestroyed() {
return this.state === secureMemory.BufferState.DESTROYED;
}
/**
* Verify buffer integrity using canary tokens and checksum
*/
verifyIntegrity() {
if (this.state === secureMemory.BufferState.DESTROYED) {
return false;
}
// Verify canary tokens
if (this.options.enableCanaries && this.canaryTokens.length > 0) {
// Verify embedded canaries in memory fragments
for (let i = 0; i < this.canaryTokens.length; i++) {
const canary = this.canaryTokens[i];
const fragmentIndex = this.canaryPositions[i];
if (fragmentIndex >= this.fragments.length) {
this.state = secureMemory.BufferState.CORRUPTED;
return false;
}
const fragment = this.fragments[fragmentIndex];
const canaryPrefix = canary.slice(0, Math.floor(canary.length / 2));
const canarySuffix = canary.slice(Math.floor(canary.length / 2));
// Verify prefix canary
const fragmentPrefix = fragment.slice(0, canaryPrefix.length);
if (!this.arraysEqual(fragmentPrefix, canaryPrefix)) {
this.state = secureMemory.BufferState.CORRUPTED;
return false;
}
// Verify suffix canary
const fragmentSuffix = fragment.slice(fragment.length - canarySuffix.length);
if (!this.arraysEqual(fragmentSuffix, canarySuffix)) {
this.state = secureMemory.BufferState.CORRUPTED;
return false;
}
}
}
// Verify checksum
if (this.checksum) {
const currentData = this.getUnencryptedBuffer();
const currentChecksum = new Uint8Array(32);
try {
if (secureMem_type.nobleHashes && secureMem_type.nobleHashes.sha256) {
const hash = new Uint8Array(secureMem_type.nobleHashes.sha256(currentData));
currentChecksum.set(hash);
}
else {
const hash = crypto__namespace.createHash("sha256");
hash.update(currentData);
currentChecksum.set(new Uint8Array(hash.digest()));
}
}
catch (e) {
// Simple checksum fallback
for (let i = 0; i < currentData.length; i++) {
currentChecksum[i % 32] ^= currentData[i];
}
}
// Constant-time comparison
let diff = 0;
for (let i = 0; i < Math.min(this.checksum.length, currentChecksum.length); i++) {
diff |= this.checksum[i] ^ currentChecksum[i];
}
if (diff !== 0) {
this.state = secureMemory.BufferState.CORRUPTED;
return false;
}
}
return true;
}
/**
* Encrypt fragments using ChaCha20-Poly1305 or AES-GCM
*/
encryptFragments() {
if (!this.encryptionKey || !this.nonce) {
return;
}
try {
// Try to use libsodium for ChaCha20-Poly1305
if (secureMem_type.sodium && secureMem_type.libraryStatus.sodium && this.options.quantumSafe) {
try {
for (let i = 0; i < this.fragments.length; i++) {
const encrypted = secureMem_type.sodium.crypto_aead_chacha20poly1305_ietf_encrypt(this.fragments[i], null, null, this.nonce, this.encryptionKey);
this.fragments[i] = new Uint8Array(encrypted);
}
return;
}
catch (sodiumError) {
console.warn("libsodium encryption failed:", sodiumError.message);
}
}
// Fallback to AES-GCM with proper IV
for (let i = 0; i < this.fragments.length; i++) {
try {
// Use createCipheriv instead of deprecated createCipher
const iv = crypto__namespace.randomBytes(12); // 96-bit IV for GCM
const cipher = crypto__namespace.createCipheriv("aes-256-gcm", this.encryptionKey, iv);
const encrypted = Buffer.concat([
iv, // Prepend IV
cipher.update(this.fragments[i]),
cipher.final(),
cipher.getAuthTag(), // Append auth tag
]);
this.fragments[i] = new Uint8Array(encrypted);
}
catch (cipherError) {
console.warn(`Fragment ${i} encryption failed:`, cipherError.message);
}
}
}
catch (e) {
console.warn("Fragment encryption failed:", e.message);
}
}
/**
* Decrypt fragments
*/
decryptFragments() {
if (!this.encryptionKey || !this.nonce) {
return;
}
try {
// Try to use libsodium for ChaCha20-Poly1305
if (secureMem_type.sodium && secureMem_type.libraryStatus.sodium && this.options.quantumSafe) {
try {
for (let i = 0; i < this.fragments.length; i++) {
const decrypted = secureMem_type.sodium.crypto_aead_chacha20poly1305_ietf_decrypt(null, this.fragments[i], null, this.nonce, this.encryptionKey);
this.fragments[i] = new Uint8Array(decrypted);
}
return;
}
catch (sodiumError) {
console.warn("libsodium decryption failed:", sodiumError.message);
}
}
// Fallback to AES-GCM with proper IV extraction
for (let i = 0; i < this.fragments.length; i++) {
try {
const fragment = this.fragments[i];
if (fragment.length < 12 + 16) {
// IV + auth tag minimum
console.warn(`Fragment ${i} too small for decryption`);
continue;
}
// Extract IV, ciphertext, and auth tag
const iv = fragment.slice(0, 12);
const authTagStart = fragment.length - 16;
const ciphertext = fragment.slice(12, authTagStart);
const authTag = fragment.slice(authTagStart);
// Use createDecipheriv instead of deprecated createDecipher
const decipher = crypto__namespace.createDecipheriv("aes-256-gcm", this.encryptionKey, iv);
decipher.setAuthTag(authTag);
const decrypted = Buffer.concat([
decipher.update(ciphertext),
decipher.final(),
]);
this.fragments[i] = new Uint8Array(decrypted);
}
catch (cipherError) {
console.warn(`Fragment ${i} decryption failed:`, cipherError.message);
}
}
}
catch (e) {
console.warn("Fragment decryption failed:", e.message);
}
}
/**
* Sets data directly in fragments (private method for initialization)
*
* @param data - Data to set in the fragments
*/
setDataInFragments(data) {
if (this.fragments.length === 1) {
// Single fragment - copy data directly
this.fragments[0].set(data);
}
else {
// Multiple fragments - distribute data across fragments
let offset = 0;
for (let i = 0; i < this.fragments.length && offset < data.length; i++) {
const fragment = this.fragments[i];
const copyLength = Math.min(fragment.length, data.length - offset);
fragment.set(data.subarray(offset, offset + copyLength));
offset += copyLength;
}
}
}
/**
* Creates a secure buffer from existing data
*
* @param data - Data to store in the secure buffer
* @param options - Security options
* @returns A new secure buffer containing the data
*/
static from(data, options = {}) {
let buffer;
if (typeof data === "string") {
buffer = new TextEncoder().encode(data);
}
else if (Array.isArray(data)) {
buffer = new Uint8Array(data);
}
else {
buffer = new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
}
const secureBuffer = new SecureBuffer(buffer.length, undefined, options);
// Set data directly in fragments instead of using getBuffer()
secureBuffer.setDataInFragments(buffer);
secureBuffer.updateChecksum();
return secureBuffer;
}
/**
* Gets the underlying buffer (decrypted if necessary)
* Throws if the buffer has been destroyed or locked
*
* @returns The underlying buffer
*/
getBuffer() {
if (this.isDestroyed()) {
throw new Error("Buffer has been destroyed");
}
if (this.isLocked()) {
throw new Error("Buffer is locked - call unlock() first");
}
this.accessCount++;
this.lastAccess = Date.now();
this.resetLockTimer();
// Verify integrity before access
if (!this.verifyIntegrity()) {
throw new Error("Buffer integrity check failed - possible tampering detected");
}
return this.getUnencryptedBuffer();
}
/**
* Gets the length of the buffer
*
* @returns The length of the buffer in bytes
*/
length() {
return this.originalSize;
}
/**
* Copies data to another buffer
*
* @param target - Target buffer
* @param targetStart - Start position in the target buffer
* @param sourceStart - Start position in this buffer
* @param sourceEnd - End position in this buffer
* @returns Number of bytes copied
*/
copy(target, targetStart = 0, sourceStart = 0, sourceEnd = this.originalSize) {
if (this.isDestroyed()) {
throw new Error("Buffer has been destroyed");
}
if (this.isLocked()) {
throw new Error("Buffer is locked - call unlock() first");
}
const sourceBuffer = this.getBuffer();
const sourceLength = Math.min(sourceEnd - sourceStart, sourceBuffer.length - sourceStart);
const targetLength = Math.min(sourceLength, target.length - targetStart);
for (let i = 0; i < targetLength; i++) {
target[targetStart + i] = sourceBuffer[sourceStart + i];
}
return targetLength;
}
/**
* Fills the buffer with the specified value
*
* @param value - Value to fill the buffer with
* @param start - Start position
* @param end - End position
* @returns This buffer
*/
fill(value, start = 0, end = this.originalSize) {
if (this.isDestroyed()) {
throw new Error("Buffer has been destroyed");
}
if (this.isLocked()) {
throw new Error("Buffer is locked - call unlock() first");
}
// Fill fragments directly
let currentPos = 0;
for (const fragment of this.fragments) {
const fragmentStart = Math.max(0, start - currentPos);
const fragmentEnd = Math.min(fragment.length, end - currentPos);
if (fragmentStart < fragmentEnd) {
for (let i = fragmentStart; i < fragmentEnd; i++) {
fragment[i] = value;
}
}
currentPos += fragment.length;
if (currentPos >= end)
break;
}
this.updateChecksum();
return this;
}
/**
* Compares this buffer with another buffer using constant-time comparison
*
* @param otherBuffer - Buffer to compare with
* @returns True if the buffers are equal, false otherwise
*/
equals(otherBuffer) {
if (this.isDestroyed()) {
throw new Error("Buffer has been destroyed");
}
if (this.isLocked()) {
throw new Error("Buffer is locked - call unlock() first");
}
const thisBuffer = this.getBuffer();
const other = typeof otherBuffer === "object" &&
otherBuffer &&
otherBuffer.constructor &&
otherBuffer.constructor.name === "SecureBuffer"
? otherBuffer.getBuffer()
: otherBuffer;
if (thisBuffer.length !== other.length) {
return false;
}
// Constant-time comparison to prevent timing attacks
let diff = 0;
// Ensure other is a Uint8Array
const otherArray = other;
for (let i = 0; i < thisBuffer.length; i++) {
diff |= thisBuffer[i] ^ otherArray[i];
}
return diff === 0;
}
/**
* Destroys the buffer by securely wiping its contents
* After calling this method, the buffer can no longer be used
*/
destroy() {
if (this.state === secureMemory.BufferState.DESTROYED) {
return; // Already destroyed
}
// Clear auto-lock timer
if (this.lockTimer) {
clearTimeout(this.lockTimer);
this.lockTimer = null;
}
// Securely wipe all fragments
for (const fragment of this.fragments) {
secureWipe(fragment, 0, fragment.length, 3);
}
// Wipe encryption keys
if (this.encryptionKey) {
secureWipe(this.encryptionKey, 0, this.encryptionKey.length, 3);
this.encryptionKey = null;
}
if (this.nonce) {
secureWipe(this.nonce, 0, this.nonce.length, 3);
this.nonce = null;
}
// Wipe canary tokens
for (const canary of this.canaryTokens) {
secureWipe(canary, 0, canary.length, 3);
}
this.canaryTokens = [];
// Wipe obfuscation mask
if (this.obfuscationMask) {
secureWipe(this.obfuscationMask, 0, this.obfuscationMask.length, 3);
this.obfuscationMask = null;
}
// Wipe checksum
if (this.checksum) {
secureWipe(this.checksum, 0, this.checksum.length, 3);
this.checksum = null;
}
// Clear fragments array
this.fragments = [];
this.state = secureMemory.BufferState.DESTROYED;
}
/**
* Get security statistics and information
*/
getSecurityInfo() {
return {
protectionLevel: this.protectionLevel,
isEncrypted: this.options.enableEncryption && !!this.encryptionKey,
isFragmented: this.options.enableFragmentation && this.fragments.length > 1,
hasCanaries: this.options.enableCanaries && this.canaryTokens.length > 0,
isObfuscated: this.options.enableObfuscation && !!this.obfuscationMask,
accessCount: this.accessCount,
lastAccess: this.lastAccess,
fragmentCount: this.fragments.length,
state: this.state,
};
}
/**
* Clone the secure buffer with the same protection settings
*/
clone() {
if (this.isDestroyed()) {
throw new Error("Cannot clone destroyed buffer");
}
const data = this.getBuffer();
return SecureBuffer.from(data, this.options);
}
/**
* Resize the buffer (creates a new buffer with copied data)
*/
resize(newSize) {
if (this.isDestroyed()) {
throw new Error("Cannot resize destroyed buffer");
}
if (newSize < 0) {
throw new Error("Buffer size cannot be negative");
}
const currentData = this.getBuffer();
const newBuffer = new SecureBuffer(newSize, 0, this.options);
if (newSize > 0) {
const copyLength = Math.min(currentData.length, newSize);
const targetBuffer = newBuffer.getBuffer();
for (let i = 0; i < copyLength; i++) {
targetBuffer[i] = currentData[i];
}
newBuffer.updateChecksum();
}
return newBuffer;
}
/**
* Update the checksum after buffer modification
*/
updateChecksum() {
if (this.state === secureMemory.BufferState.DESTROYED) {
return;
}
const data = this.getUnencryptedBuffer();
// Use SHA-256 for checksum
try {
if (secureMem_type.nobleHashes && secureMem_type.nobleHashes.sha256) {
this.checksum = new Uint8Array(secureMem_type.nobleHashes.sha256(data));
}
else {
const hash = crypto__namespace.createHash("sha256");
hash.update(data);
this.checksum = new Uint8Array(hash.digest());
}
}
catch (e) {
// Simple checksum fallback
this.checksum = new Uint8Array(32);
for (let i = 0; i < data.length; i++) {
this.checksum[i % 32] ^= data[i];
}
}
}
/**
* Registers a finalizer to clean up the buffer when it's garbage collected
* This is a best-effort approach as JavaScript doesn't guarantee finalization
*/
registerFinalizer() {
// Use FinalizationRegistry if available (modern environments)
if (typeof globalThis.FinalizationRegistry !== "undefined") {
try {
const FinalizationRegistry = globalThis
.FinalizationRegistry;
const registry = new FinalizationRegistry((heldValue) => {
// Clean up fragments if they still exist
if (heldValue.fragments) {
for (const fragment of heldValue.fragments) {
if (fragment && fragment.length > 0) {
for (let i = 0; i < fragment.length; i++) {
fragment[i] = 0;
}
}
}
}
});
registry.register(this, { fragments: this.fragments });
return;
}
catch (e) {
// Fall back to timeout approach
}
}
// Fallback timeout-based approach for older environments
const fragmentRefs = this.fragments.slice(); // Create a copy of references
setTimeout(() => {
// This will only run if the original object is garbage collected
// but the timeout reference is still alive
for (const fragment of fragmentRefs) {
if (fragment && fragment.length > 0) {
for (let i = 0; i < fragment.length; i++) {
fragment[i] = 0;
}
}
}
}, 30000); // Check after 30 seconds
}
}
/**
* Securely wipes a section of memory
*
* This implementation follows recommendations from security standards
* for secure data deletion, using multiple overwrite patterns to ensure
* data cannot be recovered even with advanced forensic techniques.
*
* @param buffer - Buffer to wipe
* @param start - Start position
* @param end - End position
* @param passes - Number of overwrite passes (default: 3)
*/
function secureWipe(buffer, start = 0, end = buffer.length, passes = 3) {
if (!buffer || buffer.length === 0) {
return;
}
// Ensure bounds are valid
start = Math.max(0, Math.min(start, buffer.length));
end = Math.max(start, Math.min(end, buffer.length));
// Ensure passes is at least 1
passes = Math.max(1, passes);
// Get a cryptographically secure random source if available
let getRandomByte;
try {
// Try to use crypto.getRandomValues in browser
if (typeof window !== "undefined" &&
window.crypto &&
window.crypto.getRandomValues) {
const randomBuffer = new Uint8Array(1);
getRandomByte = () => {
window.crypto.getRandomValues(randomBuffer);
return randomBuffer[0];
};
}
// Try to use Node.js crypto module
else if (typeof require === "function") {
try {
// const crypto = require("crypto");
getRandomByte = () => crypto__namespace.randomBytes(1)[0];
}
catch (e) {
// Fallback to Math.random if crypto is not available
getRandomByte = () => Math.floor(Math.random() * 256);
}
}
// Fallback to Math.random
else {
getRandomByte = () => Math.floor(Math.random() * 256);
}
}
catch (e) {
// Final fallback
getRandomByte = () => Math.floor(Math.random() * 256);
}
// DoD 5220.22-M inspired wiping patterns
const patterns = [
0x00, // All zeros
0xff, // All ones
0x55, // Alternating 01010101
0xaa, // Alternating 10101010
0x92, // Pseudo-random
0x49, // Pseudo-random
0x24, // Pseudo-random
0x6d, // Pseudo-random
0xb6, // Pseudo-random
0xdb, // Pseudo-random
];
// Perform the wipes
for (let pass = 0; pass < passes; pass++) {
// Use a different pattern for each pass, cycling through the available patterns
const patternIndex = pass % patterns.length;
const pattern = patterns[patternIndex];
// Fill the buffer with the pattern
for (let i = start; i < end; i++) {
// Use volatile to prevent compiler optimizations from removing this code
// This is a JavaScript approximation of the volatile keyword in C/C++
buffer[i] = pattern;
// Add a small delay every 1024 bytes to prevent optimization
if (i % 1024 === 0) {
// Force the JavaScript engine to actually perform the write
// by reading the value back and using it
const dummy = buffer[i];
if (dummy === undefined) {
// This condition will never be true, but the compiler doesn't know that
buffer[i] = getRandomByte();
}
}
}
}
// Final pass with cryptographically secure random data
for (let i = start; i < end; i++) {
buffer[i] = getRandomByte();
}
// Final zero pass
for (let i = start; i < end; i++) {
buffer[i] = 0x00;
}
}
exports.SecureBuffer = SecureBuffer;
exports.secureWipe = secureWipe;
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