Function core_hmac_sha1

example/bundle.js:516–529

(key, data)

 * Calculate the HMAC-SHA1 of a key and some data
 */
	function core_hmac_sha1(key, data) 	{
		var bkey = str2binb(key);
		if (bkey.length > 16) { bkey = core_sha1(bkey, key.length * chrsz); }

		var ipad = Array(16),
			opad = Array(16);
		for (var i = 0; i < 16; i++) {
			ipad[i] = bkey[i] ^ 0x36363636;
			opad[i] = bkey[i] ^ 0x5C5C5C5C;
		}

		var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
		return core_sha1(opad.concat(hash), 512 + 160);
	}

	/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally