Yes in "Galois Field" arithmetic. But GF(2^8) (or whatever) arithmetic is only in AES and a few other ciphers/hash functions. SHA-256 looks like an XOR / Add /

Yes in "Galois Field" arithmetic. But GF(2^8) (or whatever) arithmetic is only in AES and a few other ciphers/hash functions. SHA-256 looks like an XOR / Add / Rotate kinda cipher.