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encrypt-pubnub.js
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PUBNUB['secure'] = (function(){
var crypto = PUBNUB['crypto'];
crypto.size(256);
var cipher_key = "";
var iv = crypto.s2a("0123456789012345");
function encrypt(data) {
var hex_message = crypto.s2a(JSON.stringify(data));
var encryptedHexArray = crypto.rawEncrypt(hex_message, cipher_key, iv);
var base_64_encrypted = crypto.Base64.encode(encryptedHexArray);
return base_64_encrypted || data.data.message;
}
function decrypt(data, options) {
try {
var binary_enc = crypto.Base64.decode(data);
var json_plain = crypto.rawDecrypt(binary_enc, cipher_key, iv, false);
var plaintext = JSON.parse(json_plain);
return plaintext;
}
catch (e) {
return undefined;
}
}
return function (setup) {
// Test for Cipher Key
if (!('cipher_key' in setup))
throw "Missing 'cipher_key' in PUBNUB.secure({})";
cipher_key = crypto.s2a(SHA256(setup['cipher_key']).slice(0,32));
var pubnub = PUBNUB.init(setup);
return {
raw_encrypt : encrypt,
raw_decrypt : decrypt,
ready : pubnub.ready,
time : PUBNUB.time,
publish : function (args) {
args.message = encrypt(args.message);
return pubnub.publish(args);
},
unsubscribe : function (args) {
return pubnub.unsubscribe(args);
},
subscribe : function (args) {
var callback = args.callback || args.message;
args.callback = function (
message,
envelope,
channel,
latency
) {
var decrypted = decrypt(message);
if(typeof(decrypted) !== "undefined") {
callback(decrypted, envelope, channel, latency);
} else {
args.error && args.error({"error":"DECRYPT_ERROR", "message" : message});
}
}
return pubnub.subscribe(args);
},
history : function (args) {
var encrypted_messages = "";
var old_callback = args.callback;
var error_callback = args.error;
function new_callback(response) {
encrypted_messages = response[0];
var decrypted_messages = [];
var decrypted_failed_messages = [];
for (a = 0; a < encrypted_messages.length; a++) {
var new_message = decrypt( encrypted_messages[a]);
if (new_message) {
decrypted_messages.push((new_message));
} else {
decrypted_failed_messages.push({'error' : 'DECRYPT_ERROR' , 'message' : encrypted_messages[a]});
}
}
old_callback([
decrypted_messages,
response[1],
response[2]
]);
error_callback && error_callback([
decrypted_failed_messages,
response[1],
response[2]
]);
}
args.callback = new_callback;
pubnub.history(args);
return true;
}
};
};
})();
function SHA256(s) {
var chrsz = 8;
var hexcase = 0;
function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
function S(X, n) {
return ( X >>> n ) | (X << (32 - n));
}
function R(X, n) {
return ( X >>> n );
}
function Ch(x, y, z) {
return ((x & y) ^ ((~x) & z));
}
function Maj(x, y, z) {
return ((x & y) ^ (x & z) ^ (y & z));
}
function Sigma0256(x) {
return (S(x, 2) ^ S(x, 13) ^ S(x, 22));
}
function Sigma1256(x) {
return (S(x, 6) ^ S(x, 11) ^ S(x, 25));
}
function Gamma0256(x) {
return (S(x, 7) ^ S(x, 18) ^ R(x, 3));
}
function Gamma1256(x) {
return (S(x, 17) ^ S(x, 19) ^ R(x, 10));
}
function core_sha256(m, l) {
var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 0x14292967, 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13, 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85, 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3, 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070, 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5, 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3, 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208, 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2);
var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
var W = new Array(64);
var a, b, c, d, e, f, g, h, i, j;
var T1, T2;
m[l >> 5] |= 0x80 << (24 - l % 32);
m[((l + 64 >> 9) << 4) + 15] = l;
for (var i = 0; i < m.length; i += 16) {
a = HASH[0];
b = HASH[1];
c = HASH[2];
d = HASH[3];
e = HASH[4];
f = HASH[5];
g = HASH[6];
h = HASH[7];
for (var j = 0; j < 64; j++) {
if (j < 16) W[j] = m[j + i];
else W[j] = safe_add(safe_add(safe_add(Gamma1256(W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);
T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);
T2 = safe_add(Sigma0256(a), Maj(a, b, c));
h = g;
g = f;
f = e;
e = safe_add(d, T1);
d = c;
c = b;
b = a;
a = safe_add(T1, T2);
}
HASH[0] = safe_add(a, HASH[0]);
HASH[1] = safe_add(b, HASH[1]);
HASH[2] = safe_add(c, HASH[2]);
HASH[3] = safe_add(d, HASH[3]);
HASH[4] = safe_add(e, HASH[4]);
HASH[5] = safe_add(f, HASH[5]);
HASH[6] = safe_add(g, HASH[6]);
HASH[7] = safe_add(h, HASH[7]);
}
return HASH;
}
function str2binb(str) {
var bin = Array();
var mask = (1 << chrsz) - 1;
for (var i = 0; i < str.length * chrsz; i += chrsz) {
bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i % 32);
}
return bin;
}
function Utf8Encode(string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
}
function binb2hex(binarray) {
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for (var i = 0; i < binarray.length * 4; i++) {
str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) +
hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 )) & 0xF);
}
return str;
}
s = Utf8Encode(s);
return binb2hex(core_sha256(str2binb(s), s.length * chrsz));
}