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Date:   Fri, 14 Jan 2022 15:20:12 +0100
From:   "Jason A. Donenfeld" <>
Cc:     "Jason A. Donenfeld" <>,
        Alexei Starovoitov <>,
        Andy Lutomirski <>,
        Ard Biesheuvel <>, Erik Kline <>,
        Fernando Gont <>,
        Geert Uytterhoeven <>,
        Hannes Frederic Sowa <>,
        Herbert Xu <>,
        Jean-Philippe Aumasson <>,
        Lorenzo Colitti <>
Subject: [PATCH RFC v2 0/3] remove remaining users of SHA-1


There are currently two remaining users of SHA-1 left in the kernel: bpf
tag generation, and ipv6 address calculation. In an effort to reduce
code size and rid ourselves of insecure primitives, this RFC patchset
moves to using the more secure BLAKE2s function. I wanted to get your
feedback on how feasible this patchset is, and if there is some
remaining attachment to SHA-1, why exactly, and what could be done to
mitigate it. Rather than sending a mailing list post just asking, "what
do you think?" I figured it'd be easier to send this as an RFC patchset,
so you see specifically what I mean.

Version 2 makes the ipv6 handling a bit cleaner and fixes a build
warning from the last commit. Since this is just an RFC-for-discussion,
there's not technically a need to be sending this, but from the looks of
it, a real solution here might involve a bit more heavy lifting, so I
wanted to at least get my latest on the list in case others want to play
around with solutions in this space too. Also, the original recipient
list was too narrow, so this v2 expands that a bit.

Thoughts? Comments?


Cc: Alexei Starovoitov <>
Cc: Andy Lutomirski <>
Cc: Ard Biesheuvel <>
Cc: Erik Kline <>
Cc: Fernando Gont <>
Cc: Geert Uytterhoeven <>
Cc: Hannes Frederic Sowa <>
Cc: Herbert Xu <>
Cc: Jean-Philippe Aumasson <>
Cc: Lorenzo Colitti <>

Jason A. Donenfeld (3):
  bpf: move from sha1 to blake2s in tag calculation
  ipv6: move from sha1 to blake2s in address calculation
  crypto: sha1_generic - import lib/sha1.c locally

 crypto/sha1_generic.c | 182 +++++++++++++++++++++++++++++++++++++
 include/crypto/sha1.h |  10 ---
 kernel/bpf/core.c     |  39 +-------
 lib/Makefile          |   2 +-
 lib/sha1.c            | 204 ------------------------------------------
 net/ipv6/addrconf.c   |  56 +++---------
 6 files changed, 201 insertions(+), 292 deletions(-)
 delete mode 100644 lib/sha1.c


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