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>
This commit is contained in:
Eric Biggers
2022-07-09 14:18:49 -07:00
committed by Herbert Xu
parent 463f74089f
commit ec8f7f4821
5 changed files with 8 additions and 1 deletions

View File

@@ -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).