lib/crypto: tests: Add KUnit tests for SHA-224 and SHA-256

Add KUnit test suites for the SHA-224 and SHA-256 library functions,
including the corresponding HMAC support.  The core test logic is in the
previously-added hash-test-template.h.  This commit just adds the actual
KUnit suites, and it adds the generated test vectors to the tree so that
gen-hash-testvecs.py won't have to be run at build time.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250709200112.258500-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

lib/crypto/tests/sha256_kunit.c

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2025 Google LLC
+ */
+#include <crypto/sha2.h>
+#include "sha256-testvecs.h"
+
+#define HASH sha256
+#define HASH_CTX sha256_ctx
+#define HASH_SIZE SHA256_DIGEST_SIZE
+#define HASH_INIT sha256_init
+#define HASH_UPDATE sha256_update
+#define HASH_FINAL sha256_final
+#define HMAC_KEY hmac_sha256_key
+#define HMAC_CTX hmac_sha256_ctx
+#define HMAC_PREPAREKEY hmac_sha256_preparekey
+#define HMAC_INIT hmac_sha256_init
+#define HMAC_UPDATE hmac_sha256_update
+#define HMAC_FINAL hmac_sha256_final
+#define HMAC hmac_sha256
+#define HMAC_USINGRAWKEY hmac_sha256_usingrawkey
+#include "hash-test-template.h"
+
+static struct kunit_case hash_test_cases[] = {
+	HASH_KUNIT_CASES,
+	KUNIT_CASE(benchmark_hash),
+	{},
+};
+
+static struct kunit_suite hash_test_suite = {
+	.name = "sha256",
+	.test_cases = hash_test_cases,
+	.suite_init = hash_suite_init,
+	.suite_exit = hash_suite_exit,
+};
+kunit_test_suite(hash_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests and benchmark for SHA-256 and HMAC-SHA256");
+MODULE_LICENSE("GPL");