Using hash functions instead of internet checksum?

Question

Communication protocols

This is how the internet checksum (py) is calculated:

def checksum(data):
 data = data.hex(' ')
 hexinput = '0x'+data
 hexinput = "".join(hexinput.split())
 quads = [int(hexinput[i:i+4],16) for i in range(2, len(hexinput), 4)]
 sumstuff = hex(sum(quads))
 if len(sumstuff) > 6:
   manip = str(sumstuff)
   sumstuff = hex(int(manip[2],16)+int(manip[3:],16))
   s = hex(int(sumstuff,16) ^ 0xffff)[2:]
   return s

Is it reasonable to use the sha hash function or others in network protocols for the purpose of calculating the checksum?

Answer 1

What is "internet checksum"?
Start with what the "checksum" is for and how the hash function will help you in this situation.