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libbpf: Implement SHA256 internal helper

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Use AF_ALG sockets to not have libbpf depend on OpenSSL. The helper is
used for the loader generation code to embed the metadata hash in the
loader program and also by the bpf_map__make_exclusive API to calculate
the hash of the program the map is exclusive to.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20250914215141.15144-4-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
KP Singh
2025-09-14 23:51:32 +02:00
committed by Andrii Nakryiko
parent 8347a49c62
commit 1202ada5c1
2 changed files with 63 additions and 0 deletions
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4
src/libbpf_internal.h
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@@ -736,4 +736,8 @@ int elf_resolve_pattern_offsets(const char *binary_path, const char *pattern,
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);
#endif /* __LIBBPF_LIBBPF_INTERNAL_H */