--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022 Oracle and/or its affiliates.
+ *
+ * KUnit test of SunRPC's GSS Kerberos mechanism. Subsystem
+ * name is "rpcsec_gss_krb5".
+ */
+
+#include <kunit/test.h>
+#include <kunit/visibility.h>
+
+#include <linux/kernel.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/gss_krb5.h>
+
+#include "gss_krb5_internal.h"
+
+MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING);
+
+struct gss_krb5_test_param {
+ const char *desc;
+ u32 nfold;
+ const struct xdr_netobj *plaintext;
+ const struct xdr_netobj *expected_result;
+};
+
+static inline void gss_krb5_get_desc(const struct gss_krb5_test_param *param,
+ char *desc)
+{
+ strscpy(desc, param->desc, KUNIT_PARAM_DESC_SIZE);
+}
+
+#define DEFINE_HEX_XDR_NETOBJ(name, hex_array...) \
+ static const u8 name ## _data[] = { hex_array }; \
+ static const struct xdr_netobj name = { \
+ .data = (u8 *)name##_data, \
+ .len = sizeof(name##_data), \
+ }
+
+/*
+ * RFC 3961 Appendix A.1. n-fold
+ *
+ * The n-fold function is defined in section 5.1 of RFC 3961.
+ *
+ * This test material is copyright (C) The Internet Society (2005).
+ */
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test1_plaintext,
+ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test1_expected_result,
+ 0xbe, 0x07, 0x26, 0x31, 0x27, 0x6b, 0x19, 0x55
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test2_plaintext,
+ 0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test2_expected_result,
+ 0x78, 0xa0, 0x7b, 0x6c, 0xaf, 0x85, 0xfa
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test3_plaintext,
+ 0x52, 0x6f, 0x75, 0x67, 0x68, 0x20, 0x43, 0x6f,
+ 0x6e, 0x73, 0x65, 0x6e, 0x73, 0x75, 0x73, 0x2c,
+ 0x20, 0x61, 0x6e, 0x64, 0x20, 0x52, 0x75, 0x6e,
+ 0x6e, 0x69, 0x6e, 0x67, 0x20, 0x43, 0x6f, 0x64,
+ 0x65
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test3_expected_result,
+ 0xbb, 0x6e, 0xd3, 0x08, 0x70, 0xb7, 0xf0, 0xe0
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test4_plaintext,
+ 0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test4_expected_result,
+ 0x59, 0xe4, 0xa8, 0xca, 0x7c, 0x03, 0x85, 0xc3,
+ 0xc3, 0x7b, 0x3f, 0x6d, 0x20, 0x00, 0x24, 0x7c,
+ 0xb6, 0xe6, 0xbd, 0x5b, 0x3e
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test5_plaintext,
+ 0x4d, 0x41, 0x53, 0x53, 0x41, 0x43, 0x48, 0x56,
+ 0x53, 0x45, 0x54, 0x54, 0x53, 0x20, 0x49, 0x4e,
+ 0x53, 0x54, 0x49, 0x54, 0x56, 0x54, 0x45, 0x20,
+ 0x4f, 0x46, 0x20, 0x54, 0x45, 0x43, 0x48, 0x4e,
+ 0x4f, 0x4c, 0x4f, 0x47, 0x59
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test5_expected_result,
+ 0xdb, 0x3b, 0x0d, 0x8f, 0x0b, 0x06, 0x1e, 0x60,
+ 0x32, 0x82, 0xb3, 0x08, 0xa5, 0x08, 0x41, 0x22,
+ 0x9a, 0xd7, 0x98, 0xfa, 0xb9, 0x54, 0x0c, 0x1b
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test6_plaintext,
+ 0x51
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test6_expected_result,
+ 0x51, 0x8a, 0x54, 0xa2, 0x15, 0xa8, 0x45, 0x2a,
+ 0x51, 0x8a, 0x54, 0xa2, 0x15, 0xa8, 0x45, 0x2a,
+ 0x51, 0x8a, 0x54, 0xa2, 0x15
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test7_plaintext,
+ 0x62, 0x61
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test7_expected_result,
+ 0xfb, 0x25, 0xd5, 0x31, 0xae, 0x89, 0x74, 0x49,
+ 0x9f, 0x52, 0xfd, 0x92, 0xea, 0x98, 0x57, 0xc4,
+ 0xba, 0x24, 0xcf, 0x29, 0x7e
+);
+
+DEFINE_HEX_XDR_NETOBJ(nfold_test_kerberos,
+ 0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test8_expected_result,
+ 0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test9_expected_result,
+ 0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73,
+ 0x7b, 0x9b, 0x5b, 0x2b, 0x93, 0x13, 0x2b, 0x93
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test10_expected_result,
+ 0x83, 0x72, 0xc2, 0x36, 0x34, 0x4e, 0x5f, 0x15,
+ 0x50, 0xcd, 0x07, 0x47, 0xe1, 0x5d, 0x62, 0xca,
+ 0x7a, 0x5a, 0x3b, 0xce, 0xa4
+);
+DEFINE_HEX_XDR_NETOBJ(nfold_test11_expected_result,
+ 0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73,
+ 0x7b, 0x9b, 0x5b, 0x2b, 0x93, 0x13, 0x2b, 0x93,
+ 0x5c, 0x9b, 0xdc, 0xda, 0xd9, 0x5c, 0x98, 0x99,
+ 0xc4, 0xca, 0xe4, 0xde, 0xe6, 0xd6, 0xca, 0xe4
+);
+
+static const struct gss_krb5_test_param rfc3961_nfold_test_params[] = {
+ {
+ .desc = "64-fold(\"012345\")",
+ .nfold = 64,
+ .plaintext = &nfold_test1_plaintext,
+ .expected_result = &nfold_test1_expected_result,
+ },
+ {
+ .desc = "56-fold(\"password\")",
+ .nfold = 56,
+ .plaintext = &nfold_test2_plaintext,
+ .expected_result = &nfold_test2_expected_result,
+ },
+ {
+ .desc = "64-fold(\"Rough Consensus, and Running Code\")",
+ .nfold = 64,
+ .plaintext = &nfold_test3_plaintext,
+ .expected_result = &nfold_test3_expected_result,
+ },
+ {
+ .desc = "168-fold(\"password\")",
+ .nfold = 168,
+ .plaintext = &nfold_test4_plaintext,
+ .expected_result = &nfold_test4_expected_result,
+ },
+ {
+ .desc = "192-fold(\"MASSACHVSETTS INSTITVTE OF TECHNOLOGY\")",
+ .nfold = 192,
+ .plaintext = &nfold_test5_plaintext,
+ .expected_result = &nfold_test5_expected_result,
+ },
+ {
+ .desc = "168-fold(\"Q\")",
+ .nfold = 168,
+ .plaintext = &nfold_test6_plaintext,
+ .expected_result = &nfold_test6_expected_result,
+ },
+ {
+ .desc = "168-fold(\"ba\")",
+ .nfold = 168,
+ .plaintext = &nfold_test7_plaintext,
+ .expected_result = &nfold_test7_expected_result,
+ },
+ {
+ .desc = "64-fold(\"kerberos\")",
+ .nfold = 64,
+ .plaintext = &nfold_test_kerberos,
+ .expected_result = &nfold_test8_expected_result,
+ },
+ {
+ .desc = "128-fold(\"kerberos\")",
+ .nfold = 128,
+ .plaintext = &nfold_test_kerberos,
+ .expected_result = &nfold_test9_expected_result,
+ },
+ {
+ .desc = "168-fold(\"kerberos\")",
+ .nfold = 168,
+ .plaintext = &nfold_test_kerberos,
+ .expected_result = &nfold_test10_expected_result,
+ },
+ {
+ .desc = "256-fold(\"kerberos\")",
+ .nfold = 256,
+ .plaintext = &nfold_test_kerberos,
+ .expected_result = &nfold_test11_expected_result,
+ },
+};
+
+/* Creates the function rfc3961_nfold_gen_params */
+KUNIT_ARRAY_PARAM(rfc3961_nfold, rfc3961_nfold_test_params, gss_krb5_get_desc);
+
+static void rfc3961_nfold_case(struct kunit *test)
+{
+ const struct gss_krb5_test_param *param = test->param_value;
+ u8 *result;
+
+ /* Arrange */
+ result = kunit_kzalloc(test, 4096, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, result);
+
+ /* Act */
+ krb5_nfold(param->plaintext->len * 8, param->plaintext->data,
+ param->expected_result->len * 8, result);
+
+ /* Assert */
+ KUNIT_EXPECT_EQ_MSG(test,
+ memcmp(param->expected_result->data,
+ result, param->expected_result->len), 0,
+ "result mismatch");
+}
+
+static struct kunit_case rfc3961_test_cases[] = {
+ {
+ .name = "RFC 3961 n-fold",
+ .run_case = rfc3961_nfold_case,
+ .generate_params = rfc3961_nfold_gen_params,
+ },
+};
+
+static struct kunit_suite rfc3961_suite = {
+ .name = "RFC 3961 tests",
+ .test_cases = rfc3961_test_cases,
+};
+
+kunit_test_suites(&rfc3961_suite);
+
+MODULE_DESCRIPTION("Test RPCSEC GSS Kerberos 5 functions");
+MODULE_LICENSE("GPL");
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