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libbpf: Replace AF_ALG with open coded SHA-256

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Reimplement libbpf_sha256() using some basic SHA-256 C code.  This
eliminates the newly-added dependency on AF_ALG, which is a problematic
UAPI that is not supported by all kernels.

Make libbpf_sha256() return void, since it can no longer fail.  This
simplifies some callers.  Also drop the unnecessary 'sha_out_sz'
parameter.  Finally, also fix the typo in "compute_sha_udpate_offsets".

Fixes: c297fe3e9f99 ("libbpf: Implement SHA256 internal helper")
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://lore.kernel.org/r/20250928003833.138407-1-ebiggers@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eric Biggers
2025-09-27 17:38:33 -07:00
committed by Andrii Nakryiko
parent f9369ca839
commit 367798a9cf
3 changed files with 105 additions and 74 deletions
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src/libbpf_internal.h
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@@ -739,5 +739,5 @@ int probe_fd(int fd);
#define SHA256_DIGEST_LENGTH 32
#define SHA256_DWORD_SIZE SHA256_DIGEST_LENGTH / sizeof(__u64)
int libbpf_sha256(const void *data, size_t data_sz, void *sha_out, size_t sha_out_sz);
void libbpf_sha256(const void *data, size_t len, __u8 out[SHA256_DIGEST_LENGTH]);
#endif /* __LIBBPF_LIBBPF_INTERNAL_H */