/* Encryption TEA TEA is an oldschool symmetric ciphering algorithm that is most known for its simplicity. The encrypted block size is of 64 bits and the key size goes up to 128bits. The algorithm is vulnerable to related key attack and therefore does not inspire trust very much. For trust worthy block encryption, AES is the way to go. Regardless of vulnerability, TEA is still nice for some laid back purposes. */ #include #include using namespace std; //straight copy and paste from wikipedia //credits go to this url: //https://en.m.wikipedia.org/wiki/Tiny_Encryption_Algorithm void encrypt(uint32_t v[2], uint32_t k[4]) { uint32_t v0=v[0], v1=v[1], sum=0, i; uint32_t delta=0x9e3779b9; uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; for (i=0; i < 32; i++) { sum += delta; v0 += ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1); v1 += ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3); } v[0]=v0; v[1]=v1; } void decrypt(uint32_t v[2], uint32_t k[4]) { uint32_t v0=v[0], v1=v[1], sum=0xC6EF3720, i; uint32_t delta=0x9e3779b9; uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; for (i=0; i<32; i++) { v1 -= ((v0<<4) + k2) ^ (v0 + sum) ^ ((v0>>5) + k3); v0 -= ((v1<<4) + k0) ^ (v1 + sum) ^ ((v1>>5) + k1); sum -= delta; } v[0]=v0; v[1]=v1; } int main(){ uint32_t bloc[2]{0x1234567,0x8abcdef0}; uint32_t key[4]{0x30313233, 0x34353637, 0x30313233, 0x34353637}; encrypt(bloc,key); cout<

TEA - tea (tiny encrypt algo) symmetrical encryption