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/* keep track of which salts have been used. */
var form, usedIvs = {'':1}, usedSalts = {'':1};
/* enter actions */
var enterActions = {
password: doPbkdf2,
salt: doPbkdf2,
iter: doPbkdf2
};
function loaded() {
form = new formHandler('theForm', enterActions);
form._extendedKey = [];
sjcl.random.startCollectors();
document.getElementById("password").focus();
}
/* there's probaby a better way to tell the user something, but oh well */
function error(x) {
alert(x);
}
/* compute PBKDF2 on the password. */
function doPbkdf2(decrypting) {
var v = form.get(), salt=v.salt, key, hex = sjcl.codec.hex.fromBits, p={},
password = v.password;
p.iter = v.iter;
if (password.length == 0) {
if (decrypting) { error("Can't decrypt: need a password!"); }
return;
}
if (salt.length === 0 && decrypting) {
error("Can't decrypt: need a salt for PBKDF2!");
return;
}
if (decrypting || !v.freshsalt || !usedSalts[v.salt]) {
p.salt = v.salt;
}
p = sjcl.misc.cachedPbkdf2(password, p);
form._extendedKey = p.key;
v.key = p.key.slice(0, v.keysize/32);
v.salt = p.salt;
form.set(v);
form.plaintext.el.select();
}
/* Encrypt a message */
function doEncrypt() {
var v = form.get(), iv = v.iv, password = v.password, key = v.key, adata = v.adata, aes, plaintext=v.plaintext, rp = {}, ct, p;
if (plaintext === '' && v.ciphertext.length) { return; }
if (key.length == 0 && password.length == 0) {
error("need a password or key!");
return;
}
p = { adata:v.adata,
iter:v.iter,
mode:v.mode,
ts:parseInt(v.tag),
ks:parseInt(v.keysize) };
if (!v.freshiv || !usedIvs[v.iv]) { p.iv = v.iv; }
if (!v.freshsalt || !usedSalts[v.salt]) { p.salt = v.salt; }
ct = sjcl.encrypt(password || key, plaintext, p, rp).replace(/,/g,",\n");
v.iv = rp.iv;
usedIvs[rp.iv] = 1;
if (rp.salt) {
v.salt = rp.salt;
usedSalts[rp.salt] = 1;
}
v.key = rp.key;
if (v.json) {
v.ciphertext = ct;
v.adata = '';
} else {
v.ciphertext = ct.match(/"ct":"([^"]*)"/)[1]; //"
}
v.plaintext = '';
form.set(v);
form.ciphertext.el.select();
}
/* Decrypt a message */
function doDecrypt() {
var v = form.get(), iv = v.iv, key = v.key, adata = v.adata, aes, ciphertext=v.ciphertext, rp = {};
if (ciphertext.length === 0) { return; }
if (!v.password && !v.key.length) {
error("Can't decrypt: need a password or key!"); return;
}
if (ciphertext.match("{")) {
/* it's jsonized */
try {
v.plaintext = sjcl.decrypt(v.password || v.key, ciphertext, {}, rp);
} catch(e) {
error("Can't decrypt: "+e);
return;
}
v.mode = rp.mode;
v.iv = rp.iv;
v.adata = sjcl.codec.utf8String.fromBits(rp.adata);
if (v.password) {
v.salt = rp.salt;
v.iter = rp.iter;
v.keysize = rp.ks;
v.tag = rp.ts;
}
v.key = rp.key;
v.ciphertext = "";
document.getElementById('plaintext').select();
} else {
/* it's raw */
ciphertext = sjcl.codec.base64.toBits(ciphertext);
if (iv.length === 0) {
error("Can't decrypt: need an IV!"); return;
}
if (key.length === 0) {
if (v.password.length) {
doPbkdf2(true);
key = v.key;
}
}
aes = new sjcl.cipher.aes(key);
try {
v.plaintext = sjcl.codec.utf8String.fromBits(sjcl.mode[v.mode].decrypt(aes, ciphertext, iv, v.adata, v.tag));
v.ciphertext = "";
document.getElementById('plaintext').select();
} catch (e) {
error("Can't decrypt: " + e);
}
}
form.set(v);
}
function extendKey(size) {
form.key.set(form._extendedKey.slice(0,size));
}
function randomize(field, words, paranoia) {
form[field].set(sjcl.random.randomWords(words, paranoia));
if (field == 'salt') { form.key.set([]); }
}
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