[PATCH bpf-next 2/4] selftests/bpf: Add tests for SHA hash kfuncs

[PATCH bpf-next 2/4] selftests/bpf: Add tests for SHA hash kfuncs

[Daniel Hodges]

Add selftests to validate the SHA-256, SHA-384, and SHA-512 hash kfuncs
introduced in the BPF crypto subsystem. The tests verify both correct
functionality and proper error handling.

Test Data:
All tests use the well-known NIST test vector input "abc" and validate
against the standardized expected outputs for each algorithm. This ensures
the BPF kfunc wrappers correctly delegate to the kernel crypto library.

Signed-off-by: Daniel Hodges <git@danielhodges.dev>
---
 .../selftests/bpf/prog_tests/crypto_hash.c    | 129 ++++++++++++++++++
 .../testing/selftests/bpf/progs/crypto_hash.c |  83 +++++++++++
 2 files changed, 212 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/crypto_hash.c
 create mode 100644 tools/testing/selftests/bpf/progs/crypto_hash.c

diff --git a/tools/testing/selftests/bpf/prog_tests/crypto_hash.c b/tools/testing/selftests/bpf/prog_tests/crypto_hash.c
new file mode 100644
index 000000000000..4600dad693d4
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/crypto_hash.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+#include "crypto_hash.skel.h"
+
+/* NIST test vectors for SHA-256("abc") */
+static const unsigned char expected_sha256[32] = {
+	0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
+	0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
+	0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
+	0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad
+};
+
+/* NIST test vectors for SHA-384("abc") */
+static const unsigned char expected_sha384[48] = {
+	0xcb, 0x00, 0x75, 0x3f, 0x45, 0xa3, 0x5e, 0x8b,
+	0xb5, 0xa0, 0x3d, 0x69, 0x9a, 0xc6, 0x50, 0x07,
+	0x27, 0x2c, 0x32, 0xab, 0x0e, 0xde, 0xd1, 0x63,
+	0x1a, 0x8b, 0x60, 0x5a, 0x43, 0xff, 0x5b, 0xed,
+	0x80, 0x86, 0x07, 0x2b, 0xa1, 0xe7, 0xcc, 0x23,
+	0x58, 0xba, 0xec, 0xa1, 0x34, 0xc8, 0x25, 0xa7
+};
+
+/* NIST test vectors for SHA-512("abc") */
+static const unsigned char expected_sha512[64] = {
+	0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba,
+	0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31,
+	0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2,
+	0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a,
+	0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8,
+	0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd,
+	0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e,
+	0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f
+};
+
+static void test_sha256_basic(void)
+{
+	struct crypto_hash *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = crypto_hash__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "crypto_hash__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_sha256);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_sha256");
+	ASSERT_EQ(skel->data->sha256_status, 0, "sha256_status");
+	ASSERT_EQ(memcmp(skel->bss->sha256_output, expected_sha256, 32), 0,
+		  "sha256_output_match");
+
+	crypto_hash__destroy(skel);
+}
+
+static void test_sha384_basic(void)
+{
+	struct crypto_hash *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = crypto_hash__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "crypto_hash__open_and_load"))
+		return;
+
+	/* Run SHA-384 test */
+	prog_fd = bpf_program__fd(skel->progs.test_sha384);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_sha384");
+	ASSERT_EQ(skel->data->sha384_status, 0, "sha384_status");
+	ASSERT_EQ(memcmp(skel->bss->sha384_output, expected_sha384, 48), 0,
+		  "sha384_output_match");
+
+	crypto_hash__destroy(skel);
+}
+
+static void test_sha512_basic(void)
+{
+	struct crypto_hash *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = crypto_hash__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "crypto_hash__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_sha512);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_sha512");
+	ASSERT_EQ(skel->data->sha512_status, 0, "sha512_status");
+	ASSERT_EQ(memcmp(skel->bss->sha512_output, expected_sha512, 64), 0,
+		  "sha512_output_match");
+
+	crypto_hash__destroy(skel);
+}
+
+static void test_sha256_invalid_params(void)
+{
+	struct crypto_hash *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = crypto_hash__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "crypto_hash__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_sha256_zero_len);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_zero_len");
+	ASSERT_EQ(skel->data->sha256_status, 0, "zero_len_rejected");
+
+	crypto_hash__destroy(skel);
+}
+
+void test_crypto_hash(void)
+{
+	if (test__start_subtest("sha256_basic"))
+		test_sha256_basic();
+	if (test__start_subtest("sha384_basic"))
+		test_sha384_basic();
+	if (test__start_subtest("sha512_basic"))
+		test_sha512_basic();
+	if (test__start_subtest("sha256_invalid_params"))
+		test_sha256_invalid_params();
+}
diff --git a/tools/testing/selftests/bpf/progs/crypto_hash.c b/tools/testing/selftests/bpf/progs/crypto_hash.c
new file mode 100644
index 000000000000..d01f23557411
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/crypto_hash.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+#include "bpf_kfuncs.h"
+
+unsigned char test_input[3] = "abc";
+
+/* Expected SHA-256 hash of "abc" */
+/* ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad */
+unsigned char expected_sha256[32] = {
+	0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
+	0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
+	0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
+	0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad
+};
+
+/* Output buffers for test results */
+unsigned char sha256_output[32] = {};
+unsigned char sha384_output[48] = {};
+unsigned char sha512_output[64] = {};
+
+int sha256_status = -1;
+int sha384_status = -1;
+int sha512_status = -1;
+
+/* Declare the SHA hash kfuncs */
+extern int bpf_sha256_hash(const struct bpf_dynptr *data, const struct bpf_dynptr *out) __ksym;
+extern int bpf_sha384_hash(const struct bpf_dynptr *data, const struct bpf_dynptr *out) __ksym;
+extern int bpf_sha512_hash(const struct bpf_dynptr *data, const struct bpf_dynptr *out) __ksym;
+
+SEC("syscall")
+int test_sha256(void *ctx)
+{
+	struct bpf_dynptr input_ptr, output_ptr;
+
+	bpf_dynptr_from_mem(test_input, sizeof(test_input), 0, &input_ptr);
+	bpf_dynptr_from_mem(sha256_output, sizeof(sha256_output), 0, &output_ptr);
+
+	sha256_status = bpf_sha256_hash(&input_ptr, &output_ptr);
+	return 0;
+}
+
+SEC("syscall")
+int test_sha384(void *ctx)
+{
+	struct bpf_dynptr input_ptr, output_ptr;
+
+	bpf_dynptr_from_mem(test_input, sizeof(test_input), 0, &input_ptr);
+	bpf_dynptr_from_mem(sha384_output, sizeof(sha384_output), 0, &output_ptr);
+
+	sha384_status = bpf_sha384_hash(&input_ptr, &output_ptr);
+	return 0;
+}
+
+SEC("syscall")
+int test_sha512(void *ctx)
+{
+	struct bpf_dynptr input_ptr, output_ptr;
+
+	bpf_dynptr_from_mem(test_input, sizeof(test_input), 0, &input_ptr);
+	bpf_dynptr_from_mem(sha512_output, sizeof(sha512_output), 0, &output_ptr);
+
+	sha512_status = bpf_sha512_hash(&input_ptr, &output_ptr);
+	return 0;
+}
+
+SEC("syscall")
+int test_sha256_zero_len(void *ctx)
+{
+	struct bpf_dynptr input_ptr, output_ptr;
+	int ret;
+
+	bpf_dynptr_from_mem(test_input, 0, 0, &input_ptr);
+	bpf_dynptr_from_mem(sha256_output, sizeof(sha256_output), 0, &output_ptr);
+
+	ret = bpf_sha256_hash(&input_ptr, &output_ptr);
+	sha256_status = (ret == -22) ? 0 : ret;
+	return 0;
+}
+
+char __license[] SEC("license") = "GPL";
-- 
2.51.0

[PATCH bpf-next 4/4] selftests/bpf: Add tests for ECDSA signature verification kfuncs

[Daniel Hodges]

Add selftests to validate the ECDSA signature verification kfuncs
introduced in the BPF crypto subsystem. The tests verify both valid
signature acceptance and invalid signature rejection using the
context-based ECDSA API.

The tests use RFC 6979 test vectors for NIST P-256 (secp256r1) with
well-known valid signatures. The algorithm "p1363(ecdsa-nist-p256)"
is used to handle standard r||s signature format.

Signed-off-by: Daniel Hodges <git@danielhodges.dev>
---
 .../selftests/bpf/prog_tests/ecdsa_verify.c   |  96 ++++++++
 .../selftests/bpf/progs/ecdsa_verify.c        | 228 ++++++++++++++++++
 2 files changed, 324 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/ecdsa_verify.c
 create mode 100644 tools/testing/selftests/bpf/progs/ecdsa_verify.c

diff --git a/tools/testing/selftests/bpf/prog_tests/ecdsa_verify.c b/tools/testing/selftests/bpf/prog_tests/ecdsa_verify.c
new file mode 100644
index 000000000000..d1f83ce08ad6
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/ecdsa_verify.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+#include "ecdsa_verify.skel.h"
+
+static void test_ecdsa_verify_valid_signature(void)
+{
+	struct ecdsa_verify *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = ecdsa_verify__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "ecdsa_verify__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_ecdsa_verify_valid);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_ecdsa_verify_valid");
+	ASSERT_EQ(skel->data->ctx_create_status, 0, "ctx_create_status");
+	ASSERT_EQ(skel->data->verify_result, 0, "verify_valid_signature");
+
+	ecdsa_verify__destroy(skel);
+}
+
+static void test_ecdsa_verify_invalid_signature(void)
+{
+	struct ecdsa_verify *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = ecdsa_verify__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "ecdsa_verify__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_ecdsa_verify_invalid);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_ecdsa_verify_invalid");
+	ASSERT_NEQ(skel->data->verify_invalid_result, 0, "verify_invalid_signature_rejected");
+
+	ecdsa_verify__destroy(skel);
+}
+
+static void test_ecdsa_sign_and_verify(void)
+{
+	struct ecdsa_verify *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = ecdsa_verify__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "ecdsa_verify__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_ecdsa_sign_verify);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_ecdsa_sign_verify");
+	ASSERT_GT(skel->data->sign_result, 0, "sign_returns_signature_size");
+	ASSERT_EQ(skel->data->sign_verify_result, 0, "verify_generated_signature");
+
+	ecdsa_verify__destroy(skel);
+}
+
+static void test_ecdsa_size_queries(void)
+{
+	struct ecdsa_verify *skel;
+	int err, prog_fd;
+
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+
+	skel = ecdsa_verify__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "ecdsa_verify__open_and_load"))
+		return;
+
+	prog_fd = bpf_program__fd(skel->progs.test_ecdsa_size_queries);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+	ASSERT_OK(err, "test_ecdsa_size_queries");
+	ASSERT_EQ(skel->data->keysize_result, 256, "keysize_p256");
+	ASSERT_EQ(skel->data->digestsize_result, 64, "digestsize_p256");
+	ASSERT_EQ(skel->data->maxsize_result, 64, "maxsize_p256");
+
+	ecdsa_verify__destroy(skel);
+}
+
+void test_ecdsa_verify(void)
+{
+	if (test__start_subtest("verify_valid_signature"))
+		test_ecdsa_verify_valid_signature();
+	if (test__start_subtest("verify_invalid_signature"))
+		test_ecdsa_verify_invalid_signature();
+	if (test__start_subtest("sign_and_verify"))
+		test_ecdsa_sign_and_verify();
+	if (test__start_subtest("size_queries"))
+		test_ecdsa_size_queries();
+}
diff --git a/tools/testing/selftests/bpf/progs/ecdsa_verify.c b/tools/testing/selftests/bpf/progs/ecdsa_verify.c
new file mode 100644
index 000000000000..fb24baf6c437
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/ecdsa_verify.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+struct bpf_ecdsa_ctx;
+extern struct bpf_ecdsa_ctx *
+bpf_ecdsa_ctx_create(const struct bpf_dynptr *algo_name,
+		     const struct bpf_dynptr *public_key, int *err) __ksym;
+extern struct bpf_ecdsa_ctx *
+bpf_ecdsa_ctx_create_with_privkey(const struct bpf_dynptr *algo_name,
+				   const struct bpf_dynptr *private_key, int *err) __ksym;
+extern int bpf_ecdsa_verify(struct bpf_ecdsa_ctx *ctx,
+			    const struct bpf_dynptr *message,
+			    const struct bpf_dynptr *signature) __ksym;
+extern int bpf_ecdsa_sign(struct bpf_ecdsa_ctx *ctx,
+			  const struct bpf_dynptr *message,
+			  const struct bpf_dynptr *signature) __ksym;
+extern int bpf_ecdsa_keysize(struct bpf_ecdsa_ctx *ctx) __ksym;
+extern int bpf_ecdsa_digestsize(struct bpf_ecdsa_ctx *ctx) __ksym;
+extern int bpf_ecdsa_maxsize(struct bpf_ecdsa_ctx *ctx) __ksym;
+extern void bpf_ecdsa_ctx_release(struct bpf_ecdsa_ctx *ctx) __ksym;
+
+/* NIST P-256 test vector
+ * This is a known valid ECDSA signature for testing purposes
+ */
+
+/* Algorithm name for P-256 with p1363 format (standard r||s signature) */
+char algo_p256[] = "p1363(ecdsa-nist-p256)";
+
+/* Public key in uncompressed format: 0x04 || x || y (65 bytes) */
+unsigned char pubkey_p256[65] = {
+	0x04, /* Uncompressed point indicator */
+	/* X coordinate (32 bytes) */
+	0x60, 0xfe, 0xd4, 0xba, 0x25, 0x5a, 0x9d, 0x31,
+	0xc9, 0x61, 0xeb, 0x74, 0xc6, 0x35, 0x6d, 0x68,
+	0xc0, 0x49, 0xb8, 0x92, 0x3b, 0x61, 0xfa, 0x6c,
+	0xe6, 0x69, 0x62, 0x2e, 0x60, 0xf2, 0x9f, 0xb6,
+	/* Y coordinate (32 bytes) */
+	0x79, 0x03, 0xfe, 0x10, 0x08, 0xb8, 0xbc, 0x99,
+	0xa4, 0x1a, 0xe9, 0xe9, 0x56, 0x28, 0xbc, 0x64,
+	0xf2, 0xf1, 0xb2, 0x0c, 0x2d, 0x7e, 0x9f, 0x51,
+	0x77, 0xa3, 0xc2, 0x94, 0xd4, 0x46, 0x22, 0x99
+};
+
+/* Message hash (32 bytes) - SHA-256 of "sample" */
+unsigned char message_hash[32] = {
+	0xaf, 0x2b, 0xdb, 0xe1, 0xaa, 0x9b, 0x6e, 0xc1,
+	0xe2, 0xad, 0xe1, 0xd6, 0x94, 0xf4, 0x1f, 0xc7,
+	0x1a, 0x83, 0x1d, 0x02, 0x68, 0xe9, 0x89, 0x15,
+	0x62, 0x11, 0x3d, 0x8a, 0x62, 0xad, 0xd1, 0xbf
+};
+
+/* Valid signature r || s (64 bytes) */
+unsigned char valid_signature[64] = {
+	/* r component (32 bytes) */
+	0xef, 0xd4, 0x8b, 0x2a, 0xac, 0xb6, 0xa8, 0xfd,
+	0x11, 0x40, 0xdd, 0x9c, 0xd4, 0x5e, 0x81, 0xd6,
+	0x9d, 0x2c, 0x87, 0x7b, 0x56, 0xaa, 0xf9, 0x91,
+	0xc3, 0x4d, 0x0e, 0xa8, 0x4e, 0xaf, 0x37, 0x16,
+	/* s component (32 bytes) */
+	0xf7, 0xcb, 0x1c, 0x94, 0x2d, 0x65, 0x7c, 0x41,
+	0xd4, 0x36, 0xc7, 0xa1, 0xb6, 0xe2, 0x9f, 0x65,
+	0xf3, 0xe9, 0x00, 0xdb, 0xb9, 0xaf, 0xf4, 0x06,
+	0x4d, 0xc4, 0xab, 0x2f, 0x84, 0x3a, 0xcd, 0xa8
+};
+
+/* Invalid signature (modified r component) for negative test */
+unsigned char invalid_signature[64] = {
+	/* r component (32 bytes) - first byte modified */
+	0xff, 0xd4, 0x8b, 0x2a, 0xac, 0xb6, 0xa8, 0xfd,
+	0x11, 0x40, 0xdd, 0x9c, 0xd4, 0x5e, 0x81, 0xd6,
+	0x9d, 0x2c, 0x87, 0x7b, 0x56, 0xaa, 0xf9, 0x91,
+	0xc3, 0x4d, 0x0e, 0xa8, 0x4e, 0xaf, 0x37, 0x16,
+	/* s component (32 bytes) */
+	0xf7, 0xcb, 0x1c, 0x94, 0x2d, 0x65, 0x7c, 0x41,
+	0xd4, 0x36, 0xc7, 0xa1, 0xb6, 0xe2, 0x9f, 0x65,
+	0xf3, 0xe9, 0x00, 0xdb, 0xb9, 0xaf, 0xf4, 0x06,
+	0x4d, 0xc4, 0xab, 0x2f, 0x84, 0x3a, 0xcd, 0xa8
+};
+
+/* Private key for signing (32 bytes) - matches the public key above */
+unsigned char privkey_p256[32] = {
+	0xc9, 0xaf, 0xa9, 0xd8, 0x45, 0xba, 0x75, 0x16,
+	0x6b, 0x5c, 0x21, 0x57, 0x67, 0xb1, 0xd6, 0x93,
+	0x4e, 0x50, 0xc3, 0xdb, 0x36, 0xe8, 0x9b, 0x12,
+	0x7b, 0x8a, 0x62, 0x2b, 0x12, 0x0f, 0x67, 0x21
+};
+
+/* Test results */
+int verify_result = -1;
+int verify_invalid_result = -1;
+int ctx_create_status = -1;
+int sign_result = -1;
+int sign_verify_result = -1;
+int keysize_result = -1;
+int digestsize_result = -1;
+int maxsize_result = -1;
+unsigned char generated_signature[64] = {0};
+
+SEC("syscall")
+int test_ecdsa_verify_valid(void *ctx)
+{
+	struct bpf_ecdsa_ctx *ecdsa_ctx;
+	struct bpf_dynptr algo_ptr, key_ptr, msg_ptr, sig_ptr;
+	int err = 0;
+
+	bpf_dynptr_from_mem(algo_p256, sizeof(algo_p256) - 1, 0, &algo_ptr);
+	bpf_dynptr_from_mem(pubkey_p256, sizeof(pubkey_p256), 0, &key_ptr);
+
+	ecdsa_ctx = bpf_ecdsa_ctx_create(&algo_ptr, &key_ptr, &err);
+	if (!ecdsa_ctx) {
+		ctx_create_status = err;
+		return 0;
+	}
+	ctx_create_status = 0;
+
+	bpf_dynptr_from_mem(message_hash, sizeof(message_hash), 0, &msg_ptr);
+	bpf_dynptr_from_mem(valid_signature, sizeof(valid_signature), 0, &sig_ptr);
+
+	verify_result = bpf_ecdsa_verify(ecdsa_ctx, &msg_ptr, &sig_ptr);
+
+	bpf_ecdsa_ctx_release(ecdsa_ctx);
+
+	return 0;
+}
+
+SEC("syscall")
+int test_ecdsa_verify_invalid(void *ctx)
+{
+	struct bpf_ecdsa_ctx *ecdsa_ctx;
+	struct bpf_dynptr algo_ptr, key_ptr, msg_ptr, sig_ptr;
+	int err = 0;
+
+	bpf_dynptr_from_mem(algo_p256, sizeof(algo_p256) - 1, 0, &algo_ptr);
+	bpf_dynptr_from_mem(pubkey_p256, sizeof(pubkey_p256), 0, &key_ptr);
+
+	ecdsa_ctx = bpf_ecdsa_ctx_create(&algo_ptr, &key_ptr, &err);
+	if (!ecdsa_ctx)
+		return 0;
+
+	bpf_dynptr_from_mem(message_hash, sizeof(message_hash), 0, &msg_ptr);
+	bpf_dynptr_from_mem(invalid_signature, sizeof(invalid_signature), 0, &sig_ptr);
+
+	verify_invalid_result = bpf_ecdsa_verify(ecdsa_ctx, &msg_ptr, &sig_ptr);
+
+	bpf_ecdsa_ctx_release(ecdsa_ctx);
+
+	return 0;
+}
+
+SEC("syscall")
+int test_ecdsa_sign_verify(void *ctx)
+{
+	struct bpf_ecdsa_ctx *sign_ctx, *verify_ctx;
+	struct bpf_dynptr algo_ptr, privkey_ptr, pubkey_ptr, msg_ptr, sig_ptr;
+	int err = 0;
+
+	/* Create signing context with private key */
+	bpf_dynptr_from_mem(algo_p256, sizeof(algo_p256) - 1, 0, &algo_ptr);
+	bpf_dynptr_from_mem(privkey_p256, sizeof(privkey_p256), 0, &privkey_ptr);
+
+	sign_ctx = bpf_ecdsa_ctx_create_with_privkey(&algo_ptr, &privkey_ptr, &err);
+	if (!sign_ctx) {
+		sign_result = err;
+		return 0;
+	}
+
+	/* Sign the message */
+	bpf_dynptr_from_mem(message_hash, sizeof(message_hash), 0, &msg_ptr);
+	bpf_dynptr_from_mem(generated_signature, sizeof(generated_signature), 0, &sig_ptr);
+
+	sign_result = bpf_ecdsa_sign(sign_ctx, &msg_ptr, &sig_ptr);
+
+	bpf_ecdsa_ctx_release(sign_ctx);
+
+	/* If signing succeeded, verify the generated signature */
+	if (sign_result > 0 && sign_result <= (int)sizeof(generated_signature)) {
+		unsigned int sig_size;
+
+		/* Explicitly bound the value for the verifier */
+		sig_size = sign_result & 0x3F; /* Max 64 bytes */
+
+		bpf_dynptr_from_mem(algo_p256, sizeof(algo_p256) - 1, 0, &algo_ptr);
+		bpf_dynptr_from_mem(pubkey_p256, sizeof(pubkey_p256), 0, &pubkey_ptr);
+
+		verify_ctx = bpf_ecdsa_ctx_create(&algo_ptr, &pubkey_ptr, &err);
+		if (!verify_ctx) {
+			sign_verify_result = err;
+			return 0;
+		}
+
+		bpf_dynptr_from_mem(message_hash, sizeof(message_hash), 0, &msg_ptr);
+		bpf_dynptr_from_mem(generated_signature, sig_size, 0, &sig_ptr);
+
+		sign_verify_result = bpf_ecdsa_verify(verify_ctx, &msg_ptr, &sig_ptr);
+
+		bpf_ecdsa_ctx_release(verify_ctx);
+	}
+
+	return 0;
+}
+
+SEC("syscall")
+int test_ecdsa_size_queries(void *ctx)
+{
+	struct bpf_ecdsa_ctx *ecdsa_ctx;
+	struct bpf_dynptr algo_ptr, key_ptr;
+	int err = 0;
+
+	bpf_dynptr_from_mem(algo_p256, sizeof(algo_p256) - 1, 0, &algo_ptr);
+	bpf_dynptr_from_mem(pubkey_p256, sizeof(pubkey_p256), 0, &key_ptr);
+
+	ecdsa_ctx = bpf_ecdsa_ctx_create(&algo_ptr, &key_ptr, &err);
+	if (!ecdsa_ctx)
+		return 0;
+
+	keysize_result = bpf_ecdsa_keysize(ecdsa_ctx);
+	digestsize_result = bpf_ecdsa_digestsize(ecdsa_ctx);
+	maxsize_result = bpf_ecdsa_maxsize(ecdsa_ctx);
+
+	bpf_ecdsa_ctx_release(ecdsa_ctx);
+
+	return 0;
+}
+
+char __license[] SEC("license") = "GPL";
-- 
2.51.0

Re: [PATCH bpf-next 2/4] selftests/bpf: Add tests for SHA hash kfuncs

[Vadim Fedorenko]

On 17/11/2025 21:13, Daniel Hodges wrote:
> Add selftests to validate the SHA-256, SHA-384, and SHA-512 hash kfuncs
> introduced in the BPF crypto subsystem. The tests verify both correct
> functionality and proper error handling.
> 
> Test Data:
> All tests use the well-known NIST test vector input "abc" and validate
> against the standardized expected outputs for each algorithm. This ensures
> the BPF kfunc wrappers correctly delegate to the kernel crypto library.
> 
> Signed-off-by: Daniel Hodges <git@danielhodges.dev>

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>