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abc1805 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | export async function generateKeyPair() {
return await crypto.subtle.generateKey(
{
name: "RSA-OAEP",
modulusLength: 2048,
publicExponent: new Uint8Array([1, 0, 1]),
hash: "SHA-256",
},
true,
["encrypt", "decrypt"]
);
}
export async function exportKey(key: CryptoKey) {
const exported = await crypto.subtle.exportKey("jwk", key);
return exported;
}
export async function importKey(jwk: JsonWebKey, usage: KeyUsage[]) {
return await crypto.subtle.importKey(
"jwk",
jwk,
{
name: "RSA-OAEP",
hash: "SHA-256",
},
true,
usage
);
}
export async function encryptMessage(publicKey: CryptoKey, message: string) {
const encoder = new TextEncoder();
const data = encoder.encode(message);
const encrypted = await crypto.subtle.encrypt(
{
name: "RSA-OAEP",
},
publicKey,
data
);
return arrayBufferToBase64(encrypted);
}
export async function decryptMessage(privateKey: CryptoKey, encryptedMessage: string) {
const data = base64ToArrayBuffer(encryptedMessage);
const decrypted = await crypto.subtle.decrypt(
{
name: "RSA-OAEP",
},
privateKey,
data
);
const decoder = new TextDecoder();
return decoder.decode(decrypted);
}
function arrayBufferToBase64(buffer: ArrayBuffer) {
let binary = "";
const bytes = new Uint8Array(buffer);
const len = bytes.byteLength;
for (let i = 0; i < len; i++) {
binary += String.fromCharCode(bytes[i]);
}
return btoa(binary);
}
function base64ToArrayBuffer(base64: string) {
const binaryString = atob(base64);
const bytes = new Uint8Array(binaryString.length);
for (let i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
// ========== AES-GCM Functions for Hybrid Encryption ==========
export async function generateSymKey() {
return await crypto.subtle.generateKey(
{
name: "AES-GCM",
length: 256,
},
true,
["encrypt", "decrypt"]
);
}
export async function encryptSymMessage(key: CryptoKey, message: string) {
const encoder = new TextEncoder();
const data = encoder.encode(message);
const iv = crypto.getRandomValues(new Uint8Array(12));
const encrypted = await crypto.subtle.encrypt(
{
name: "AES-GCM",
iv: iv,
},
key,
data
);
// Combine IV and ciphertext
const combined = new Uint8Array(iv.length + encrypted.byteLength);
combined.set(iv);
combined.set(new Uint8Array(encrypted), iv.length);
return arrayBufferToBase64(combined.buffer);
}
export async function decryptSymMessage(key: CryptoKey, encryptedMessage: string) {
const combined = base64ToArrayBuffer(encryptedMessage);
const combinedArray = new Uint8Array(combined);
const iv = combinedArray.slice(0, 12);
const data = combinedArray.slice(12);
const decrypted = await crypto.subtle.decrypt(
{
name: "AES-GCM",
iv: iv,
},
key,
data
);
const decoder = new TextDecoder();
return decoder.decode(decrypted);
}
export async function exportSymKey(key: CryptoKey) {
const exported = await crypto.subtle.exportKey("raw", key);
return arrayBufferToBase64(exported);
}
export async function importSymKey(rawKey: string) {
const buffer = base64ToArrayBuffer(rawKey);
return await crypto.subtle.importKey(
"raw",
buffer,
{
name: "AES-GCM",
},
true,
["encrypt", "decrypt"]
);
}
// ========== FILE ENCRYPTION FUNCTIONS ==========
/**
* Encrypt a file (ArrayBuffer) with AES-GCM
*/
export async function encryptFile(aesKey: CryptoKey, fileData: ArrayBuffer): Promise<ArrayBuffer> {
const iv = crypto.getRandomValues(new Uint8Array(12));
const encrypted = await crypto.subtle.encrypt(
{
name: "AES-GCM",
iv,
},
aesKey,
fileData
);
// Combine IV + encrypted data
const combined = new Uint8Array(iv.length + encrypted.byteLength);
combined.set(iv, 0);
combined.set(new Uint8Array(encrypted), iv.length);
return combined.buffer;
}
/**
* Decrypt a file (ArrayBuffer) with AES-GCM
*/
export async function decryptFile(aesKey: CryptoKey, encryptedData: ArrayBuffer): Promise<ArrayBuffer> {
const combined = new Uint8Array(encryptedData);
const iv = combined.slice(0, 12);
const data = combined.slice(12);
const decrypted = await crypto.subtle.decrypt(
{
name: "AES-GCM",
iv: iv,
},
aesKey,
data
);
return decrypted;
}
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