Tales of Zestiria Checksum

    /*
     * Tales of Zestiria Checksum
     * Reversed by Vulnavia
     * Implemented by kill_seth
     * Checksum stored at 0x514
     * Checksum covers 0x6D8 -> Size(0x9BA00)
     */
    public class SHA1_TOZ
    {
        public static byte[] Compute(byte[] data)
        {
            string key = "TO12";
            string[] keys = { "SRA", "ROS", "MIC", "LAI", "EDN", "DEZ", "ZAB", "ALI" };
            byte[] hash = Compute(data, Encoding.ASCII.GetBytes(key));
            int x = 0;
            for (int i = 0; i < 100; i++)
            {
                hash = Compute(hash, Encoding.ASCII.GetBytes(keys[x++]));
                if (x > 7) x = 0;
            }
            return hash;
        }

        private static byte[] Compute(byte[] data, byte[] key)
        {
            SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
            sha.TransformBlock(data, 0, data.Length, data, 0);
            sha.TransformFinalBlock(key, 0, key.Length);
            return sha.Hash;
        }
    }