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crypto: lib - create utils module and move __crypto_memneq into it

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As requested at
https://lore.kernel.org/r/YtEgzHuuMts0YBCz@gondor.apana.org.au, move
__crypto_memneq into lib/crypto/ and put it under a new tristate.  The
tristate is CRYPTO_LIB_UTILS, and it builds a module libcryptoutils.  As
more crypto library utilities are being added, this creates a single
place for them to go without cluttering up the main lib directory.

The module's main file will be lib/crypto/utils.c.  However, leave
memneq.c as its own file because of its nonstandard license.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2022-07-25 11:36:34 -07:00 committed by Herbert Xu
parent 908f24270d
commit 7033b937e2
6 changed files with 12 additions and 7 deletions
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2
crypto/Kconfig
View File

@ -15,7 +15,7 @@ source "crypto/async_tx/Kconfig"
#
menuconfig CRYPTO
tristate "Cryptographic API"
select LIB_MEMNEQ
select CRYPTO_LIB_UTILS
help
This option provides the core Cryptographic API.

3
lib/Kconfig
View File

@ -127,9 +127,6 @@ config TRACE_MMIO_ACCESS
source "lib/crypto/Kconfig"
config LIB_MEMNEQ
bool
config CRC_CCITT
tristate "CRC-CCITT functions"
help

1
lib/Makefile
View File

@ -253,7 +253,6 @@ obj-$(CONFIG_DIMLIB) += dim/
obj-$(CONFIG_SIGNATURE) += digsig.o
lib-$(CONFIG_CLZ_TAB) += clz_tab.o
lib-$(CONFIG_LIB_MEMNEQ) += memneq.o
obj-$(CONFIG_GENERIC_STRNCPY_FROM_USER) += strncpy_from_user.o
obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o

5
lib/crypto/Kconfig
View File

@ -2,6 +2,9 @@
menu "Crypto library routines"
config CRYPTO_LIB_UTILS
tristate
config CRYPTO_LIB_AES
tristate
@ -71,7 +74,7 @@ config CRYPTO_LIB_CURVE25519
tristate "Curve25519 scalar multiplication library"
depends on CRYPTO_ARCH_HAVE_LIB_CURVE25519 || !CRYPTO_ARCH_HAVE_LIB_CURVE25519
select CRYPTO_LIB_CURVE25519_GENERIC if CRYPTO_ARCH_HAVE_LIB_CURVE25519=n
select LIB_MEMNEQ
select CRYPTO_LIB_UTILS
help
Enable the Curve25519 library interface. This interface may be
fulfilled by either the generic implementation or an arch-specific

3
lib/crypto/Makefile
View File

@ -1,5 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_CRYPTO_LIB_UTILS) += libcryptoutils.o
libcryptoutils-y := memneq.o
# chacha is used by the /dev/random driver which is always builtin
obj-y += chacha.o
obj-$(CONFIG_CRYPTO_LIB_CHACHA_GENERIC) += libchacha.o

5
lib/memneq.c → lib/crypto/memneq.c
View File

@ -59,8 +59,9 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <crypto/algapi.h>
#include <asm/unaligned.h>
#include <crypto/algapi.h>
#include <linux/module.h>
#ifndef __HAVE_ARCH_CRYPTO_MEMNEQ
@ -174,3 +175,5 @@ noinline unsigned long __crypto_memneq(const void *a, const void *b,
EXPORT_SYMBOL(__crypto_memneq);
#endif /* __HAVE_ARCH_CRYPTO_MEMNEQ */
MODULE_LICENSE("GPL");