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authorEric Biggers2022-07-09 14:18:49 -0700
committerHerbert Xu2022-07-15 16:43:59 +0800
commitec8f7f4821d5e70d71601519bc2325b311324a96 (patch)
tree45c64f86acc7dac2c6a2087c38787f4ac2ce79f9 /crypto/Kconfig
parent463f74089ff9148e3e46af454a6977d40b98cd10 (diff)
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 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig1
1 files changed, 1 insertions, 0 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).