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/**
* True zero-knowledge encryption utilities
* Keys are generated randomly in the browser and never derived from server secrets
*/
export interface ZeroKnowledgeEncryptionResult {
encryptedData: ArrayBuffer;
key: ArrayBuffer;
iv: ArrayBuffer;
}
/**
* Encrypt data with a randomly generated key (true zero-knowledge)
*/
export async function encryptWithRandomKey(
data: ArrayBuffer
): Promise<ZeroKnowledgeEncryptionResult> {
// Generate a truly random 256-bit key
const key = crypto.getRandomValues(new Uint8Array(32));
// Generate random IV
const iv = crypto.getRandomValues(new Uint8Array(12));
// Import the key for encryption
const cryptoKey = await crypto.subtle.importKey(
"raw",
key,
{ name: " " },
false,
["encrypt"]
);
// Encrypt the data
const encryptedResult = await crypto.subtle.encrypt(
{ name: "AES-GCM", iv },
cryptoKey,
data
);
// For AES-GCM, we need to append the authentication tag
// The encrypted result contains both ciphertext and tag
return {
encryptedData: encryptedResult,
key: key.buffer,
iv: iv.buffer,
};
}
/**
* Convert ArrayBuffer to base64 string for transmission
*/
export function arrayBufferToBase64(buffer: ArrayBuffer): string {
const bytes = new Uint8Array(buffer);
let binary = "";
for (let i = 0; i < bytes.byteLength; i++) {
binary += String.fromCharCode(bytes[i]);
}
return btoa(binary);
}
/**
* Convert base64 string back to ArrayBuffer
*/
export function base64ToArrayBuffer(base64: string): ArrayBuffer {
const binary = atob(base64);
const bytes = new Uint8Array(binary.length);
for (let i = 0; i < binary.length; i++) {
bytes[i] = binary.charCodeAt(i);
}
return bytes.buffer;
}
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