checksum = _mm_crc32_u64 (0, discriminator);
checksum = _mm_crc32_u64 (checksum, expire_time);
checksum = _mm_crc32_u64 (checksum, secret);
checksum = _mm_crc32_u64 (0, discriminator);
checksum = _mm_crc32_u64 (checksum, expire_time);
checksum = _mm_crc32_u64 (checksum, secret);