On Mon, Apr 28, 2025 at 01:17:02PM +0800, Herbert Xu wrote:

Changes in v3:
- Add shash sha256-lib/sha224-lib to provide test coverage for libsha256.

This is based on

	https://patchwork.kernel.org/project/linux-crypto/list/?series=957558

Original description:

Following the example of several other algorithms (e.g. CRC32, ChaCha,
Poly1305, BLAKE2s), this series refactors the kernel's existing
architecture-optimized SHA-256 code to be available via the library API,
instead of just via the crypto_shash API as it was before.  It also
reimplements the SHA-256 crypto_shash API on top of the library API.

This makes it possible to use the SHA-256 library in
performance-critical cases.  The new design is also much simpler, with a
negative diffstat of over 1200 lines.  Finally, this also fixes the
longstanding issue where the arch-optimized SHA-256 was disabled by
default, so people often forgot to enable it.

For now the SHA-256 library is well-covered by the crypto_shash
self-tests, but I plan to add a test for the library directly later.
I've fully tested this series on arm, arm64, riscv, and x86.  On mips,
powerpc, s390, and sparc I've only been able to partially test it, since
QEMU does not support the SHA-256 instructions on those platforms.  If
anyone with access to a mips, powerpc, s390, or sparc system that has
SHA-256 instructions can verify that the crypto self-tests still pass,
that would be appreciated.  But I don't expect any issues, especially
since the new code is more straightforward than the old code.

Eric Biggers (13):
  crypto: sha256 - support arch-optimized lib and expose through shash
  crypto: arm/sha256 - implement library instead of shash
  crypto: arm64/sha256 - remove obsolete chunking logic
  crypto: arm64/sha256 - implement library instead of shash
  crypto: mips/sha256 - implement library instead of shash
  crypto: powerpc/sha256 - implement library instead of shash
  crypto: riscv/sha256 - implement library instead of shash
  crypto: s390/sha256 - implement library instead of shash
  crypto: sparc - move opcodes.h into asm directory
  crypto: sparc/sha256 - implement library instead of shash
  crypto: x86/sha256 - implement library instead of shash
  crypto: sha256 - remove sha256_base.h
  crypto: lib/sha256 - improve function prototypes

To be clear, the objections I have on your v2 patchset still hold.  Your
unsolicited changes to my patches add unnecessary complexity and redundancy,
make the crypto_shash API even harder to use correctly, and also break the build
for several architectures.  If you're going to again use your maintainer
privileges to push these out anyway over my objections, I'd appreciate it if you
at least made your dubious changes as incremental patches using your own
authorship so that they can be properly reviewed/blamed.

Please also note that I've sent a v4 which fixes the one real issue that my v1
patchset had: https://lore.kernel.org/r/20250428170040.423825-1-ebiggers@kernel.org (local)

- Eric