Created
March 22, 2023 04:22
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encrypt and decrypt using web crypto api (PBKDF2)
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function getKeyMaterial() { | |
const password = window.prompt("Enter your password"); | |
const enc = new TextEncoder(); | |
return window.crypto.subtle.importKey( | |
"raw", | |
enc.encode(password), | |
"PBKDF2", | |
false, | |
["deriveBits", "deriveKey"] | |
); | |
} | |
async function encrypt(plaintext, salt, iv) { | |
const keyMaterial = await getKeyMaterial(); | |
const key = await window.crypto.subtle.deriveKey( | |
{ | |
name: "PBKDF2", | |
salt, | |
iterations: 100000, | |
hash: "SHA-256", | |
}, | |
keyMaterial, | |
{ name: "AES-GCM", length: 256 }, | |
true, | |
["encrypt", "decrypt"] | |
); | |
console.log(typeof plaintext); | |
const enc = new TextEncoder(); | |
plaintext = enc.encode(plaintext); | |
console.log(typeof plaintext); | |
console.log(typeof iv); | |
console.log(iv); | |
return window.crypto.subtle.encrypt({ name: "AES-GCM", iv }, key, plaintext); | |
} | |
async function decrypt(ciphertext, salt, iv) { | |
try { | |
console.log(ciphertext); | |
let keyMaterial = await getKeyMaterial(); | |
const key = await window.crypto.subtle.deriveKey( | |
{ | |
name: "PBKDF2", | |
salt, | |
iterations: 100000, | |
hash: "SHA-256", | |
}, | |
keyMaterial, | |
{ name: "AES-GCM", length: 256 }, | |
true, | |
["encrypt", "decrypt"] | |
); | |
let decrypted = await window.crypto.subtle.decrypt( | |
{ | |
name: "AES-GCM", | |
iv: iv, | |
}, | |
key, | |
ciphertext | |
); | |
let dec = new TextDecoder(); | |
return dec.decode(decrypted); | |
} catch (e) { | |
return null; | |
} | |
} | |
const salt = window.crypto.getRandomValues(new Uint8Array(16)); | |
const iv = window.crypto.getRandomValues(new Uint8Array(12)); | |
encrypt("Hello World", salt, iv).then( | |
(ciphertext) => { | |
console.log(ciphertext); | |
decrypt(ciphertext, salt, iv).then( | |
(plaintext) => { | |
console.log(plaintext); | |
} | |
); | |
} | |
); |
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