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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 <[email protected]> Reviewed-by: Jason A. Donenfeld <[email protected]> Acked-by: Jakub Kicinski <[email protected]> Acked-by: Alexei Starovoitov <[email protected]> Signed-off-by: Herbert Xu <[email protected]>