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selftests/bpf: Add test for libbpf_sha256()
Test that libbpf_sha256() calculates SHA-256 digests correctly.
Tested with:
make -C tools/testing/selftests/bpf/
./tools/testing/selftests/bpf/test_progs -t sha256 -v
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
authored by
Eric Biggers
and committed by
Alexei Starovoitov
f09f57c7
55c0ced5
+52
+52
tools/testing/selftests/bpf/prog_tests/sha256.c
+52
tools/testing/selftests/bpf/prog_tests/sha256.c
···
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright 2025 Google LLC */
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#include <test_progs.h>
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#include "bpf/libbpf_internal.h"
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#define MAX_LEN 4096
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/* Test libbpf_sha256() for all lengths from 0 to MAX_LEN inclusively. */
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void test_sha256(void)
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{
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/*
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* The correctness of this value was verified by running this test with
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* libbpf_sha256() replaced by OpenSSL's SHA256().
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*/
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static const __u8 expected_digest_of_digests[SHA256_DIGEST_LENGTH] = {
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0x62, 0x30, 0x0e, 0x1d, 0xea, 0x7f, 0xc4, 0x74,
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0xfd, 0x8e, 0x64, 0x0b, 0xd8, 0x5f, 0xea, 0x04,
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0xf3, 0xef, 0x77, 0x42, 0xc2, 0x01, 0xb8, 0x90,
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0x6e, 0x19, 0x91, 0x1b, 0xca, 0xb3, 0x28, 0x42,
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};
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__u64 seed = 0;
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__u8 *data = NULL, *digests = NULL;
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__u8 digest_of_digests[SHA256_DIGEST_LENGTH];
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size_t i;
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data = malloc(MAX_LEN);
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if (!ASSERT_OK_PTR(data, "malloc"))
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goto out;
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digests = malloc((MAX_LEN + 1) * SHA256_DIGEST_LENGTH);
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if (!ASSERT_OK_PTR(digests, "malloc"))
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goto out;
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/* Generate MAX_LEN bytes of "random" data deterministically. */
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for (i = 0; i < MAX_LEN; i++) {
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seed = (seed * 25214903917 + 11) & ((1ULL << 48) - 1);
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data[i] = (__u8)(seed >> 16);
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}
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/* Calculate a digest for each length 0 through MAX_LEN inclusively. */
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for (i = 0; i <= MAX_LEN; i++)
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libbpf_sha256(data, i, &digests[i * SHA256_DIGEST_LENGTH]);
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/* Calculate and verify the digest of all the digests. */
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libbpf_sha256(digests, (MAX_LEN + 1) * SHA256_DIGEST_LENGTH,
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digest_of_digests);
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ASSERT_MEMEQ(digest_of_digests, expected_digest_of_digests,
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SHA256_DIGEST_LENGTH, "digest_of_digests");
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out:
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free(data);
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free(digests);
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}