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initial chacha20 code;

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This commit is contained in:
Jeff Becker 2017-01-29 18:15:02 -05:00
parent 21008c857a
commit 94632b37c9
3 changed files with 101 additions and 7 deletions
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18
contrib/js/contrib/chacha20.js → contrib/js/nntpchan/chacha20.js
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@ -6,6 +6,7 @@
// See for details: http://cr.yp.to/chacha/chacha-20080128.pdf
function U8TO32_LE(x, i) {
if(x === undefined) return;
return x[i] | (x[i+1]<<8) | (x[i+2]<<16) | (x[i+3]<<24);
}
@ -20,7 +21,7 @@ function ROTATE(v, c) {
return (v << c) | (v >>> (32 - c));
}
var Chacha20 = function(key, nonce, counter) {
function Chacha20(key, nonce, counter) {
this.input = new Uint32Array(16);
// https://tools.ietf.org/html/draft-irtf-cfrg-chacha20-poly1305-01#section-2.3
@ -103,14 +104,17 @@ Chacha20.prototype.keystream = function(dst, len) {
this.encrypt(dst, dst, len);
};
// additions to make it easier and export it as a module
var Cipher = Chacha20;
exports.Cipher = Chacha20;
var chacha_encrypt;
var chacha_decrypt;
exports.encrypt = exports.decrypt = function(key, nonce, data)
chacha_decrypt = function(key, nonce, data)
{
var cipher = new Chacha20(key, nonce);
var ret = new Buffer(data.length);
var cipher = new Chacha20(key, nonce, 0);
var ret = new Uint8Array(data.length);
cipher.encrypt(ret, data, data.length);
return ret;
}
};
chacha_encrypt = chacha_decrypt;

68
contrib/js/nntpchan/crypto.js Normal file
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@ -0,0 +1,68 @@
var nntpchan_ToBase64 = function (u8) {
return btoa(String.fromCharCode.apply(null, u8));
};
var nntpchan_FromBase64 = function (str) {
return atob(str).split('').map(function (c) { return c.charCodeAt(0); });
};
function nntpchan_keygen() {
var crypto = window.crypto || window.msCrypto;
if(!crypto) {
throw "no crypto";
}
var key = new Uint8Array(32);
crypto.getRandomValues(key);
var nonce = new Uint8Array(12);
crypto.getRandomValues(nonce);
return nntpchan_ToBase64(key) + ":" + nntpchan_ToBase64(nonce);
}
function nntpchan_chacha_nonce(blob) {
var parts = blob.split(":");
return nntpchan_FromBase64(parts[1]);
}
function nntpchan_chacha_key(blob) {
var parts = blob.split(":");
return nntpchan_FromBase64(parts[0]);
}
// encrypt text from an element using symettric key and nonce
// output to element.innerHTML as base64
function nntpchan_encrypt_element(inelem, outelem, key, nonce) {
var plaintext = inelem.innerHTML;
console.log(plaintext);
var ciphertext = chacha_encrypt(key, nonce, plaintext);
outelem.innerHTML = nntpchan_ToBase64(ciphertext);
}
// encrypt text from an element using symettric key and nonce
// output to element.innerHTML as base64
function nntpchan_decrypt_element(inelem, outelem, key, nonce) {
var ciphertext = nntpchan_FromBase64(inelem.innerHTML);
console.log(ciphertext);
var plaintext = chacha_decrypt(key, nonce, ciphertext);
console.log(plaintext);
while(outelem.children.length > 0) {
outelem.children[0].remove();
}
outelem.appendChild(document.createTextNode(plaintext));
}
function nntpchan_crypto_test() {
console.log("begin crypto test");
var genelem = $("#test_keygen");
genelem[0].innerHTML = nntpchan_keygen();
var inelem = $("#encrypt_in")[0];
var outelem = $("#encrypt_out")[0];
var decryptelem = $("#decrypt_out")[0];
var key = nntpchan_chacha_key(genelem[0].innerHTML);
var nonce = nntpchan_chacha_nonce(genelem[0].innerHTML);
nntpchan_encrypt_element(inelem, outelem, key, nonce);
nntpchan_decrypt_element(outelem, decryptelem, key, nonce);
}

22
contrib/static/test.html Normal file
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@ -0,0 +1,22 @@
<html>
<head>
<title> crypto test page </title>
<script src="nntpchan.js"></script>
</head>
<body>
<div id="test_keygen">
</div>
<div id="encrypt_in">
test encrypt
</div>
<div id="encrypt_out">
</div>
<div id="decrypt_out">
</div>
<script>
nntpchan_crypto_test();
</script>
</body>
</html>