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Status:Verified (3)

RFC 1071, "Computing the Internet checksum", September 1988

Note: This RFC has been updated byRFC 1141

Errata ID:560
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Tim Moors
Date Reported: 2004-04-05

Section 4.1 says:

        while( count > 1 )  {           /*  This is the inner loop */               sum += * (unsigned short) addr++;               count -= 2;

It should say:

        while( count > 1 )  {           /*  This is the inner loop */               sum += * (unsigned short *) addr++;               count -= 2;

Errata ID:4918
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Cihangir Akturk
Date Reported: 2017-01-26
Verifier Name: Éric Vyncke
Date Verified: 2025-06-27

Section 4.1 says:

while( count > 1 )  {        /*  This is the inner loop */        sum += * (unsigned short) addr++;        count -= 2;}

It should say:

while( count > 1 )  {        /*  This is the inner loop */        sum += * (unsigned short *) addr;        addr += 2;        count -= 2;}

Notes:

- In the original text, code incorrectly casts from pointer to integer.
- Increments addr pointer by 1. Because unsigned short is two bytes, it should have been incremented by 2 instead.

Errata ID:7711
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Mohammed Amine CHAKIR
Date Reported: 2023-11-23
Verifier Name: RFC Editor
Date Verified: 2023-11-28

Section 3 says:

We now present explicit examples of calculating a simple 1'scomplement sum on a 2's complement machine.  The examples show thesame sum calculated byte by bye, by 16-bits words in normal andswapped order, and 32 bits at a time in 3 different orders.  Allnumbers are in hex.

It should say:

We now present explicit examples of calculating a simple 1'scomplement sum on a 2's complement machine.  The examples show thesame sum calculated byte by byte, by 16-bits words in normal andswapped order, and 32 bits at a time in 3 different orders.  Allnumbers are in hex.

Notes:

A small typo in line 3 in the second occurrence of the word 'byte'

Status:Held for Document Update (1)

RFC 1071, "Computing the Internet checksum", September 1988

Note: This RFC has been updated byRFC 1141

Errata ID:3133
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: chenhaospark
Date Reported: 2012-02-23
Held for Document Update by: Brian Haberman

Section 4.1 says:

           /*  Add left-over byte, if any */       if( count > 0 )               sum += * (unsigned char *) addr;

It should say:

           /*  Add left-over byte, if any */       if( count > 0 )  {               unsigned short left_over = 0;               * (unsigned char *) &left_over = * (unsigned char *) addr;               sum += left_over;       }

Notes:

for big-endian

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