diff options
| author | Eric Biggers <ebiggers@google.com> | 2022-07-09 14:18:49 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-07-15 16:43:59 +0800 |
| commit | ec8f7f4821d5e70d71601519bc2325b311324a96 (patch) | |
| tree | 45c64f86acc7dac2c6a2087c38787f4ac2ce79f9 | |
| parent | 463f74089ff9148e3e46af454a6977d40b98cd10 (diff) | |
| download | lwn-ec8f7f4821d5e70d71601519bc2325b311324a96.tar.gz lwn-ec8f7f4821d5e70d71601519bc2325b311324a96.zip | |
crypto: lib - make the sha1 library optional
Since the Linux RNG no longer uses sha1_transform(), the SHA-1 library
is no longer needed unconditionally. Make it possible to build the
Linux kernel without the SHA-1 library by putting it behind a kconfig
option, and selecting this new option from the kconfig options that gate
the remaining users: CRYPTO_SHA1 for crypto/sha1_generic.c, BPF for
kernel/bpf/core.c, and IPV6 for net/ipv6/addrconf.c.
Unfortunately, since BPF is selected by NET, for now this can only make
a difference for kernels built without networking support.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | crypto/Kconfig | 1 | ||||
| -rw-r--r-- | init/Kconfig | 1 | ||||
| -rw-r--r-- | lib/crypto/Kconfig | 3 | ||||
| -rw-r--r-- | lib/crypto/Makefile | 3 | ||||
| -rw-r--r-- | net/ipv6/Kconfig | 1 |
5 files changed, 8 insertions, 1 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 54bdcf2ce331..75c71d9a5ffb 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -901,6 +901,7 @@ config CRYPTO_RMD160 config CRYPTO_SHA1 tristate "SHA1 digest algorithm" select CRYPTO_HASH + select CRYPTO_LIB_SHA1 help SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2). diff --git a/init/Kconfig b/init/Kconfig index c984afc489de..d8d0b4bdfe41 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1472,6 +1472,7 @@ config HAVE_PCSPKR_PLATFORM # interpreter that classic socket filters depend on config BPF bool + select CRYPTO_LIB_SHA1 menuconfig EXPERT bool "Configure standard kernel features (expert users)" diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig index 2082af43d51f..9ff549f63540 100644 --- a/lib/crypto/Kconfig +++ b/lib/crypto/Kconfig @@ -121,6 +121,9 @@ config CRYPTO_LIB_CHACHA20POLY1305 select CRYPTO_LIB_POLY1305 select CRYPTO_ALGAPI +config CRYPTO_LIB_SHA1 + tristate + config CRYPTO_LIB_SHA256 tristate diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile index d28111ba54fc..919cbb2c220d 100644 --- a/lib/crypto/Makefile +++ b/lib/crypto/Makefile @@ -34,7 +34,8 @@ libpoly1305-y := poly1305-donna32.o libpoly1305-$(CONFIG_ARCH_SUPPORTS_INT128) := poly1305-donna64.o libpoly1305-y += poly1305.o -obj-y += sha1.o +obj-$(CONFIG_CRYPTO_LIB_SHA1) += libsha1.o +libsha1-y := sha1.o obj-$(CONFIG_CRYPTO_LIB_SHA256) += libsha256.o libsha256-y := sha256.o diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig index bf2e5e5fe142..658bfed1df8b 100644 --- a/net/ipv6/Kconfig +++ b/net/ipv6/Kconfig @@ -7,6 +7,7 @@ menuconfig IPV6 tristate "The IPv6 protocol" default y + select CRYPTO_LIB_SHA1 help Support for IP version 6 (IPv6). |