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const encoder = new TextEncoder();
const decoder = new TextDecoder();
const IV_LENGTH = 16;
export async function encrypt(key: string, data: string) {
const iv = crypto.getRandomValues(new Uint8Array(IV_LENGTH));
const cryptoKey = await getKey(key);
const ciphertext = await crypto.subtle.encrypt(
{
name: 'AES-CBC',
iv,
},
cryptoKey,
encoder.encode(data),
);
const bundle = new Uint8Array(IV_LENGTH + ciphertext.byteLength);
bundle.set(new Uint8Array(ciphertext));
bundle.set(iv, ciphertext.byteLength);
return decodeBase64(bundle);
}
export async function decrypt(key: string, payload: string) {
const bundle = encodeBase64(payload);
const iv = new Uint8Array(bundle.buffer, bundle.byteLength - IV_LENGTH);
const ciphertext = new Uint8Array(bundle.buffer, 0, bundle.byteLength - IV_LENGTH);
const cryptoKey = await getKey(key);
const plaintext = await crypto.subtle.decrypt(
{
name: 'AES-CBC',
iv,
},
cryptoKey,
ciphertext,
);
return decoder.decode(plaintext);
}
async function getKey(key: string) {
return await crypto.subtle.importKey('raw', encodeBase64(key), { name: 'AES-CBC' }, false, ['encrypt', 'decrypt']);
}
function decodeBase64(encoded: Uint8Array) {
const byteChars = Array.from(encoded, (byte) => String.fromCodePoint(byte));
return btoa(byteChars.join(''));
}
function encodeBase64(data: string) {
return Uint8Array.from(atob(data), (ch) => ch.codePointAt(0)!);
}
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