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refactor frontend, add readme

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This commit is contained in:
Gregor Lohaus
2026-02-25 16:43:51 +01:00
parent 0d34b632ac
commit e78ebb25c3
8 changed files with 140 additions and 108 deletions
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31
Backend/src/main/resources/static/crypto.js
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@@ -16,13 +16,32 @@ async function encryptFile(arrayBuffer) {
// SHA-256(rawKey) → file identifier sent to server; server never sees the key itself
const rawKey = await crypto.subtle.exportKey('raw', key);
const hash = Array.from(new Uint8Array(await crypto.subtle.digest('SHA-256', rawKey)))
.map(b => b.toString(16).padStart(2, '0'))
.join('');
const hash = await hashKey(rawKey);
// Base64url-encode key for URL fragment
const base64urlKey = btoa(String.fromCharCode(...new Uint8Array(rawKey)))
.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
const base64urlKey = encodeKey(rawKey);
return { payload, hash, base64urlKey };
}
async function hashKey(rawKey) {
return Array.from(new Uint8Array(await crypto.subtle.digest('SHA-256', rawKey)))
.map(b => b.toString(16).padStart(2, '0'))
.join('');
}
async function decryptFile(payload, key) {
const bytes = new Uint8Array(payload);
const iv = bytes.slice(0, 12);
const ciphertext = bytes.slice(12);
return crypto.subtle.decrypt({ name: 'AES-GCM', iv }, key, ciphertext);
}
function encodeKey(rawKey) {
return btoa(String.fromCharCode(...new Uint8Array(rawKey)))
.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
}
function decodeKey(base64url) {
const base64 = base64url.replace(/-/g, '+').replace(/_/g, '/');
return Uint8Array.from(atob(base64), c => c.charCodeAt(0));
}