#zh3ro_CTF_2021 # from secret import flag def ROTL(value, bits, size=32): return ((value % (1 << (size - bits))) << bits) | (value >> (size - bits)) def ROTR(value, bits, size=32): return ((value % (1 << bits)) << (size - bits)) | (value >> bits) def pad(pt): pt+=b'\x80' L = len(pt) to_pad = 60-(L%6…