mirror of https://github.com/lus/pasty.git
60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
// Encrypts a piece of text using AES-CBC and returns the HEX-encoded key, initialization vector and encrypted text
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export async function encrypt(encryptionData, text) {
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const key = encryptionData.key;
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const iv = encryptionData.iv;
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const textBytes = aesjs.padding.pkcs7.pad(aesjs.utils.utf8.toBytes(text));
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const aes = new aesjs.ModeOfOperation.cbc(key, iv);
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const encrypted = aes.encrypt(textBytes);
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return {
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key: aesjs.utils.hex.fromBytes(key),
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iv: aesjs.utils.hex.fromBytes(iv),
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result: aesjs.utils.hex.fromBytes(encrypted)
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};
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}
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// Decrypts an encrypted piece of AES-CBC encrypted text
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export async function decrypt(keyHex, ivHex, inputHex) {
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const key = aesjs.utils.hex.toBytes(keyHex);
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const iv = aesjs.utils.hex.toBytes(ivHex);
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const input = aesjs.utils.hex.toBytes(inputHex);
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const aes = new aesjs.ModeOfOperation.cbc(key, iv);
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const decrypted = aesjs.padding.pkcs7.strip(aes.decrypt(input));
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return aesjs.utils.utf8.fromBytes(decrypted);
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}
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// Creates encryption data from hex key and IV
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export async function encryptionDataFromHex(keyHex, ivHex) {
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return {
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key: aesjs.utils.hex.toBytes(keyHex),
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iv: aesjs.utils.hex.toBytes(ivHex)
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};
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}
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// Generates encryption data to pass into the encrypt function
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export async function generateEncryptionData() {
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return {
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key: await generateKey(),
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iv: generateIV()
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};
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}
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// Generates a new 256-bit AES-CBC key
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async function generateKey() {
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const key = await crypto.subtle.generateKey({
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name: "AES-CBC",
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length: 256
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}, true, ["encrypt", "decrypt"]);
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const extracted = await crypto.subtle.exportKey("raw", key);
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return new Uint8Array(extracted);
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}
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// Generates a new cryptographically secure 16-byte array which is used as the initialization vector (IV) for AES-CBC
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function generateIV() {
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return crypto.getRandomValues(new Uint8Array(16));
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} |