Function EncryptXTea

engine/dlib/src/dlib/crypt.cpp:26–40

    const uint32_t NUM_ROUNDS = 32;

    static inline uint64_t EncryptXTea(uint64_t v, const uint32_t* key)
    {
        uint32_t v0 = (uint32_t) (v >> 32);
        uint32_t v1 = (uint32_t) (v & 0xffffffff);

        uint32_t sum = 0, delta = 0x9e3779b9;
        for (uint32_t i = 0; i < NUM_ROUNDS; i++)
        {
            v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + dmEndian::ToHost(key[sum & 3]));
            sum += delta;
            v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + dmEndian::ToHost(key[(sum>>11) & 3]));
        }
        uint64_t ret = dmEndian::ToHost((((uint64_t) v0) << 32 | v1));
        return ret;
    }

    static void EncryptXTeaCTR(uint8_t* data, uint32_t datalen, const uint8_t* key, uint32_t keylen)
    {