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lib/crypto: blake2b: Add BLAKE2b library functions

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Add a library API for BLAKE2b, closely modeled after the BLAKE2s API.

This will allow in-kernel users such as btrfs to use BLAKE2b without
going through the generic crypto layer.  In addition, as usual the
BLAKE2b crypto_shash algorithms will be reimplemented on top of this.

Note: to create lib/crypto/blake2b.c I made a copy of
lib/crypto/blake2s.c and made the updates from BLAKE2s => BLAKE2b.  This
way, the BLAKE2s and BLAKE2b code is kept consistent.  Therefore, it
borrows the SPDX-License-Identifier and Copyright from
lib/crypto/blake2s.c rather than crypto/blake2b_generic.c.

The library API uses 'struct blake2b_ctx', consistent with other
lib/crypto/ APIs.  The existing 'struct blake2b_state' will be removed
once the blake2b crypto_shash algorithms are updated to stop using it.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251018043106.375964-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2025-10-17 21:31:02 -07:00
parent c99d307060
commit 23a16c9533
5 changed files with 330 additions and 13 deletions
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9
lib/crypto/Makefile
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@@ -31,6 +31,15 @@ obj-$(CONFIG_CRYPTO_LIB_GF128MUL) += gf128mul.o
################################################################################
obj-$(CONFIG_CRYPTO_LIB_BLAKE2B) += libblake2b.o
libblake2b-y := blake2b.o
CFLAGS_blake2b.o := -Wframe-larger-than=4096 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105930
ifeq ($(CONFIG_CRYPTO_LIB_BLAKE2B_ARCH),y)
CFLAGS_blake2b.o += -I$(src)/$(SRCARCH)
endif # CONFIG_CRYPTO_LIB_BLAKE2B_ARCH
################################################################################
# blake2s is used by the /dev/random driver which is always builtin
obj-y += blake2s.o
ifeq ($(CONFIG_CRYPTO_LIB_BLAKE2S_ARCH),y)