From ec8f7f4821d5e70d71601519bc2325b311324a96 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sat, 9 Jul 2022 14:18:49 -0700 Subject: 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 Reviewed-by: Jason A. Donenfeld Acked-by: Jakub Kicinski Acked-by: Alexei Starovoitov Signed-off-by: Herbert Xu --- crypto/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'crypto') 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). -- cgit v1.2.3-59-g8ed1b