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RFC 7539, "ChaCha20 and Poly1305 for IETF Protocols", May 2015

Note: This RFC has been obsoleted by RFC 8439

Source of RFC: IRTF

Errata ID: 8274
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Alina Obst
Date Reported: 2025-01-30
Edited by: Nick Sullivan
Date Edited: 2025-03-06

Section 2.3.2 says: 

 ChaCha state with the key setup.

       61707865  3320646e  79622d32  6b206574
       03020100  07060504  0b0a0908  0f0e0d0c
       13121110  17161514  1b1a1918  1f1e1d1c
       00000001  09000000  4a000000  00000000

It should say:

 ChaCha state with the key setup.

       61707865  3320646e  79622d32  6b206574
       03020100  07060504  0b0a0908  0f0e0d0c
       13121110  17161514  1b1a1918  1f1e1d1c
       01000000  09000000  4a000000  00000000

Notes:

Section 2.3 says: "A 32-bit block count parameter, treated as a 32-bit little-endian integer". In Section 2.3.2 the initial block counter is set to 1 which is 00000001 in big-endian hex. So I think, the corresponding entry in the state matrix (index 12) should be 01000000.

Note from CFRG Chair: this change also applies to RFC 8439, which supercedes RFC 7539

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