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authorEric Biggers <ebiggers@google.com>2022-07-10 00:18:49 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2022-07-15 11:43:59 +0300
commitec8f7f4821d5e70d71601519bc2325b311324a96 (patch)
tree45c64f86acc7dac2c6a2087c38787f4ac2ce79f9 /lib
parent463f74089ff9148e3e46af454a6977d40b98cd10 (diff)
downloadlinux-ec8f7f4821d5e70d71601519bc2325b311324a96.tar.xz
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/crypto/Kconfig3
-rw-r--r--lib/crypto/Makefile3
2 files changed, 5 insertions, 1 deletions
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