HMAC.js
1.01 KB
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(function(){
var C = (typeof window === 'undefined') ? require('./Crypto').Crypto : window.Crypto;
// Shortcuts
var util = C.util,
charenc = C.charenc,
UTF8 = charenc.UTF8,
Binary = charenc.Binary;
C.HMAC = function (hasher, message, key, options) {
// Convert to byte arrays
if (message.constructor == String) message = UTF8.stringToBytes(message);
if (key.constructor == String) key = UTF8.stringToBytes(key);
/* else, assume byte arrays already */
// Allow arbitrary length keys
if (key.length > hasher._blocksize * 4)
key = hasher(key, { asBytes: true });
// XOR keys with pad constants
var okey = key.slice(0),
ikey = key.slice(0);
for (var i = 0; i < hasher._blocksize * 4; i++) {
okey[i] ^= 0x5C;
ikey[i] ^= 0x36;
}
var hmacbytes = hasher(okey.concat(hasher(ikey.concat(message), { asBytes: true })), { asBytes: true });
return options && options.asBytes ? hmacbytes :
options && options.asString ? Binary.bytesToString(hmacbytes) :
util.bytesToHex(hmacbytes);
};
})();