[PATCH 4/4] test: lib: add test for key derivation

[Philippe Reynes]

Adds a test for the function sha256_hkdf.

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
 test/lib/Makefile           |   2 +-
 test/lib/test_sha256_hkdf.c | 104 ++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 test/lib/test_sha256_hkdf.c

diff --git a/test/lib/Makefile b/test/lib/Makefile
index 170c5a539ca..1b7baa696db 100644
--- a/test/lib/Makefile
+++ b/test/lib/Makefile
@@ -19,7 +19,7 @@ obj-$(CONFIG_ERRNO_STR) += test_errno_str.o
 obj-$(CONFIG_UT_LIB_ASN1) += asn1.o
 obj-$(CONFIG_UT_LIB_RSA) += rsa.o
 obj-$(CONFIG_AES) += test_aes.o
-obj-$(CONFIG_SHA256) += test_sha256_hmac.o
+obj-$(CONFIG_SHA256) += test_sha256_hmac.o test_sha256_hkdf.o
 obj-$(CONFIG_GETOPT) += getopt.o
 obj-$(CONFIG_CRC8) += test_crc8.o
 obj-$(CONFIG_UT_LIB_CRYPT) += test_crypt.o
diff --git a/test/lib/test_sha256_hkdf.c b/test/lib/test_sha256_hkdf.c
new file mode 100644
index 00000000000..ca173a13afc
--- /dev/null
+++ b/test/lib/test_sha256_hkdf.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2024 Philippe Reynes <philippe.reynes at softathome.com>
+ *
+ * Unit tests for sha256_hkdf functions
+ */
+
+#include <command.h>
+#include <test/lib.h>
+#include <test/test.h>
+#include <test/ut.h>
+#include <u-boot/sha256.h>
+
+struct test_sha256_hkdf_s {
+	unsigned char *salt;
+	int saltlen;
+	unsigned char *ikm;
+	int ikmlen;
+	unsigned char *info;
+	int infolen;
+	unsigned char *expected;
+	int expectedlen;
+};
+
+/*
+ * data comes from:
+ * https://www.rfc-editor.org/rfc/rfc5869
+ */
+static unsigned char salt_test1[] = {
+	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+	0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c };
+
+static unsigned char ikm_test1[] = {
+	0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+	0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b };
+
+static unsigned char info_test1[] = {
+	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9 };
+
+static unsigned char expected_test1[] = {
+	0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a,
+	0x90, 0x43, 0x4f, 0x64, 0xd0, 0x36, 0x2f, 0x2a,
+	0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c,
+	0x5d, 0xb0, 0x2d, 0x56, 0xec, 0xc4, 0xc5, 0xbf,
+	0x34, 0x00, 0x72, 0x08, 0xd5, 0xb8, 0x87, 0x18,
+	0x58, 0x65 };
+
+static struct test_sha256_hkdf_s test_sha256_hkdf[] = {
+	{
+		.salt = salt_test1,
+		.saltlen = sizeof(salt_test1),
+		.ikm = ikm_test1,
+		.ikmlen = sizeof(ikm_test1),
+		.info = info_test1,
+		.infolen = sizeof(info_test1),
+		.expected = expected_test1,
+		.expectedlen = sizeof(expected_test1),
+	},
+};
+
+static int _lib_test_sha256_hkdf_run(struct unit_test_state *uts,
+				     unsigned char *salt, int saltlen,
+				     unsigned char *ikm, int ikmlen,
+				     unsigned char *info, int infolen,
+				     unsigned char *expected, int expectedlen)
+{
+	unsigned char output[64];
+
+	sha256_hkdf(salt, saltlen, ikm, ikmlen, info, infolen, output, expectedlen);
+	ut_asserteq_mem(expected, output, expectedlen);
+
+	return 0;
+}
+
+static int lib_test_sha256_hkdf_run(struct unit_test_state *uts,
+				    struct test_sha256_hkdf_s *test)
+{
+	unsigned char *salt = test->salt;
+	int saltlen = test->saltlen;
+	unsigned char *ikm = test->ikm;
+	int ikmlen = test->ikmlen;
+	unsigned char *info = test->info;
+	int infolen = test->infolen;
+	unsigned char *expected = test->expected;
+	int expectedlen = test->expectedlen;
+
+	return _lib_test_sha256_hkdf_run(uts, salt, saltlen, ikm, ikmlen,
+					 info, infolen, expected, expectedlen);
+}
+
+static int lib_test_sha256_hkdf(struct unit_test_state *uts)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(test_sha256_hkdf); i++) {
+		ret = lib_test_sha256_hkdf_run(uts, &test_sha256_hkdf[i]);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+LIB_TEST(lib_test_sha256_hkdf, 0);
-- 
2.25.1