def byte_xx
import bend-osdev-aead@0.1.0.0/PROOF.bend as PROOFimport Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
68def byte_xx(+h: U32, +k: U32) -> {B.byte(h) == B.byte(U32.xor(B.byte(U32.xor(h, k)), k)) : U32}:
69 %byte_xor_byte(U32.xor(h, k), k) : {B.byte(h) == _ : U32}
70 %u32_xx(h, k) : {B.byte(h) == B.byte(_) : U32}
71 {==}