108 lines
2.4 KiB
JavaScript
108 lines
2.4 KiB
JavaScript
let encForm = new Form({id: "encryption", tag: document.getElementById("encryption")});
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let encMsg = encForm.createTextArea({label: "Message"});
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let encPass = encForm.createPasswordInput({label: "Password"});
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let encButton = encForm.createButton({label: "Encrypt"});
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let encOut = encForm.createOutput({
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label: "Output",
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dataType: "json-b64",
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});
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let decForm = new Form({id: "decryption", tag: document.getElementById("decryption")});
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let decMsg = decForm.createTextArea({
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label: "Encrypted message",
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dataType: "json-b64",
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});
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let decPass = decForm.createPasswordInput({label: "Password"});
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let decButton = decForm.createButton({label: "Decrypt"});
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let decOut = decForm.createOutput({label: "Output"});
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function getKeyMaterial(password) {
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let enc = new TextEncoder();
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return window.crypto.subtle.importKey(
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"raw",
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enc.encode(password),
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"PBKDF2",
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false,
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["deriveKey"]
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);
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}
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function getKey(keyMaterial, salt) {
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return window.crypto.subtle.deriveKey(
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{
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"name": "PBKDF2",
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"hash": "SHA-256",
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"salt": salt,
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"iterations": 300000
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},
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keyMaterial,
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{
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"name": "AES-GCM",
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"length": 256
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},
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true,
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["encrypt", "decrypt"]
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);
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}
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async function encrypt() {
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let keyMaterial = await getKeyMaterial(encPass.value);
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let salt = window.crypto.getRandomValues(new Uint8Array(16));
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let key = await getKey(keyMaterial, salt);
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let iv = window.crypto.getRandomValues(new Uint8Array(16));
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let enc = new TextEncoder();
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let msgEncoded = enc.encode(encMsg.value);
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let ciphertext = await window.crypto.subtle.encrypt(
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{
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"name": "AES-GCM",
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"iv": iv
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},
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key,
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msgEncoded
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);
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encOut.value = {
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"ciphertext": bufToB64(ciphertext),
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"salt": bufToB64(salt),
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"iv": bufToB64(iv)
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}
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}
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async function decrypt() {
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let msgEncoded = decMsg.value;
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let ciphertext = new b64ToBuf(msgEncoded.ciphertext);
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let iv = new Uint8Array(b64ToBuf(msgEncoded.iv));
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let salt = new Uint8Array(b64ToBuf(msgEncoded.salt));
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let keyMaterial = await getKeyMaterial(decPass.value);
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let key = await getKey(keyMaterial, salt);
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let plaintext;
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try {
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plaintext = await window.crypto.subtle.decrypt(
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{
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"name": "AES-GCM",
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"iv": iv
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},
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key,
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ciphertext
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);
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} catch (e) {
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decPass.alertBox("alert-error", "Decryption error: incorrect password?");
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}
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let dec = new TextDecoder();
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decOut.value = `${dec.decode(plaintext)}`;
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}
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encButton.handle.addEventListener("click", encrypt);
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decButton.handle.addEventListener("click", decrypt);
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