[LTP] [PATCH v2 17/33] keyctl25: Test KEYCTL_DH_COMPUTE shared secret computation
Andrea Cervesato
andrea.cervesato@suse.de
Fri Sep 4 14:09:06 CEST 2026
From: Andrea Cervesato <andrea.cervesato@suse.com>
Test KEYCTL_DH_COMPUTE shared secret computation: verify that
computing a 256-byte DH shared secret with RFC 7919 FFDHE-2048
parameters matches the precomputed mathematical value.
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
runtest/syscalls | 1 +
testcases/kernel/syscalls/keyctl/.gitignore | 1 +
testcases/kernel/syscalls/keyctl/keyctl25.c | 66 ++++++++++++++++++++
testcases/kernel/syscalls/keyctl/keyctl_dh_data.h | 74 +++++++++++++++++++++++
4 files changed, 142 insertions(+)
diff --git a/runtest/syscalls b/runtest/syscalls
index be35e9f93..1b059f652 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -742,6 +742,7 @@ keyctl21 keyctl21
keyctl22 keyctl22
keyctl23 keyctl23
keyctl24 keyctl24
+keyctl25 keyctl25
kcmp01 kcmp01
kcmp02 kcmp02
diff --git a/testcases/kernel/syscalls/keyctl/.gitignore b/testcases/kernel/syscalls/keyctl/.gitignore
index 767ccf61a..4cf772558 100644
--- a/testcases/kernel/syscalls/keyctl/.gitignore
+++ b/testcases/kernel/syscalls/keyctl/.gitignore
@@ -22,3 +22,4 @@
/keyctl22
/keyctl23
/keyctl24
+/keyctl25
diff --git a/testcases/kernel/syscalls/keyctl/keyctl25.c b/testcases/kernel/syscalls/keyctl/keyctl25.c
new file mode 100644
index 000000000..f2d94a9f0
--- /dev/null
+++ b/testcases/kernel/syscalls/keyctl/keyctl25.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Test ``KEYCTL_DH_COMPUTE`` shared secret computation of :manpage:`keyctl(2)`.
+ *
+ * [Algorithm]
+ *
+ * - compute DH shared secret using RFC 7919 FFDHE-2048 parameters and
+ * verify the 256-byte result matches the expected secret
+ */
+
+#include "keyctl_common.h"
+#include "keyctl_dh_data.h"
+
+static struct keyctl_dh_params *dh_params;
+static unsigned char out_buf[256];
+
+static void setup(void)
+{
+ SAFE_KEYCTL(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
+
+ dh_params->priv = new_user_key("dh_priv", dh_priv, sizeof(dh_priv),
+ KEY_SPEC_PROCESS_KEYRING);
+ dh_params->prime = new_user_key("dh_prime", dh_prime, sizeof(dh_prime),
+ KEY_SPEC_PROCESS_KEYRING);
+ dh_params->base = new_user_key("dh_base", dh_base, sizeof(dh_base),
+ KEY_SPEC_PROCESS_KEYRING);
+}
+
+static void run(void)
+{
+ memset(out_buf, 0, sizeof(out_buf));
+
+ TST_EXP_EQ_LI_SILENT(keyctl(KEYCTL_DH_COMPUTE, (unsigned long)dh_params,
+ (unsigned long)out_buf,
+ sizeof(dh_expected_secret), 0),
+ (long)sizeof(dh_expected_secret));
+ if (!TST_PASS)
+ return;
+
+ if (memcmp(out_buf, dh_expected_secret, sizeof(dh_expected_secret))) {
+ tst_res(TFAIL, "computed secret does not match expected value");
+ return;
+ }
+
+ tst_res(TPASS, "KEYCTL_DH_COMPUTE computed expected shared secret");
+}
+
+static struct tst_test test = {
+ .setup = setup,
+ .test_all = run,
+ .min_kver = "4.7",
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_KEYS=y",
+ "CONFIG_KEY_DH_OPERATIONS=y",
+ "CONFIG_CRYPTO_DH",
+ NULL
+ },
+ .bufs = (struct tst_buffers []) {
+ {&dh_params, .size = sizeof(*dh_params)},
+ {},
+ },
+};
diff --git a/testcases/kernel/syscalls/keyctl/keyctl_dh_data.h b/testcases/kernel/syscalls/keyctl/keyctl_dh_data.h
new file mode 100644
index 000000000..bc1432dc3
--- /dev/null
+++ b/testcases/kernel/syscalls/keyctl/keyctl_dh_data.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2026 Andrea Cervesato <andrea.cervesato@suse.com>
+ *
+ * Static test vectors for KEYCTL_DH_COMPUTE tests (keyctl25..keyctl28).
+ */
+
+#ifndef KEYCTL_DH_DATA_H__
+#define KEYCTL_DH_DATA_H__
+
+/* RFC 7919 2048-bit FFDHE Group parameters (ffdhe2048) */
+static const unsigned char dh_prime[] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc9, 0x0f, 0xda, 0xa2, 0x21, 0x68, 0xc2, 0x34,
+ 0xc4, 0xc6, 0x62, 0x8b, 0x80, 0xdc, 0x1c, 0xd1, 0x29, 0x02, 0x4e, 0x08, 0x8a, 0x67, 0xcc, 0x74,
+ 0x02, 0x0b, 0xbe, 0xa6, 0x3b, 0x13, 0x9b, 0x22, 0x51, 0x4a, 0x08, 0x79, 0x8e, 0x34, 0x04, 0xdd,
+ 0xef, 0x95, 0x19, 0xb3, 0xcd, 0x3a, 0x43, 0x1b, 0x30, 0x2b, 0x0a, 0x6d, 0xf2, 0x5f, 0x14, 0x37,
+ 0x4f, 0xe1, 0x35, 0x6d, 0x6d, 0x51, 0xc2, 0x45, 0xe4, 0x85, 0xb5, 0x76, 0x62, 0x5e, 0x7e, 0xc6,
+ 0xf4, 0x4c, 0x42, 0xe9, 0xa6, 0x37, 0xed, 0x6b, 0x0b, 0xff, 0x5c, 0xb6, 0xf4, 0x06, 0xb7, 0xed,
+ 0xee, 0x38, 0x6b, 0xfb, 0x5a, 0x89, 0x9f, 0xa5, 0xae, 0x9f, 0x24, 0x11, 0x7c, 0x4b, 0x1f, 0xe6,
+ 0x49, 0x28, 0x66, 0x51, 0xec, 0xe4, 0x5b, 0x3d, 0xc2, 0x00, 0x7c, 0xb8, 0xa1, 0x63, 0xbf, 0x05,
+ 0x98, 0xda, 0x48, 0x36, 0x1c, 0x55, 0xd3, 0x9a, 0x69, 0x16, 0x3f, 0xa8, 0xfd, 0x24, 0xcf, 0x5f,
+ 0x83, 0x65, 0x5d, 0x23, 0xdc, 0xa3, 0xad, 0x96, 0x1c, 0x62, 0xf3, 0x56, 0x20, 0x85, 0x52, 0xbb,
+ 0x9e, 0xd5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6d, 0x67, 0x0c, 0x35, 0x4e, 0x4a, 0xbc, 0x98, 0x04,
+ 0xf1, 0x74, 0x6c, 0x08, 0xca, 0x18, 0x21, 0x7c, 0x32, 0x90, 0x5e, 0x46, 0x2e, 0x36, 0xce, 0x3b,
+ 0xe3, 0x9e, 0x77, 0x2c, 0x18, 0x0e, 0x86, 0x03, 0x9b, 0x27, 0x83, 0xa2, 0xec, 0x07, 0xa2, 0x8f,
+ 0xb5, 0xc5, 0x5d, 0xf0, 0x6f, 0x4c, 0x52, 0xc9, 0xde, 0x2b, 0xcb, 0xf6, 0x95, 0x58, 0x17, 0x18,
+ 0x39, 0x95, 0x49, 0x7c, 0xea, 0x95, 0x6a, 0xe5, 0x15, 0xd2, 0x26, 0x18, 0x98, 0xfa, 0x05, 0x10,
+ 0x15, 0x72, 0x8e, 0x5a, 0x8a, 0xac, 0xaa, 0x68, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+};
+
+static const unsigned char dh_priv[] = {
+ 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+ 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+};
+
+static const unsigned char dh_base[] = {
+ 0xdd, 0x5d, 0x87, 0xa6, 0xf9, 0xdf, 0x57, 0xf1, 0x3d, 0xf2, 0xc6, 0x58, 0xe5, 0x01, 0xab, 0xd7,
+ 0x2a, 0xdb, 0xa3, 0x48, 0x63, 0x61, 0x3b, 0xd1, 0x67, 0x69, 0xee, 0xf9, 0x55, 0x25, 0x8e, 0x36,
+ 0x11, 0xee, 0x8e, 0xc5, 0x42, 0xa4, 0x26, 0xe3, 0x75, 0xc6, 0xb4, 0xd8, 0x3b, 0x71, 0x7c, 0x97,
+ 0xf8, 0x85, 0x04, 0xb4, 0x3a, 0xcc, 0x5d, 0xf0, 0x3a, 0x49, 0x04, 0xe8, 0x8d, 0x26, 0x19, 0xdf,
+ 0xb7, 0xfb, 0x3c, 0xda, 0x68, 0xbc, 0x13, 0x6c, 0x46, 0x8d, 0xfe, 0xdf, 0x1c, 0x5a, 0x5b, 0x73,
+ 0x04, 0x64, 0x08, 0x86, 0x6f, 0xec, 0x89, 0x49, 0xbe, 0xb5, 0x87, 0xa0, 0xa4, 0xb6, 0xe6, 0xc0,
+ 0xde, 0xf5, 0xf2, 0x44, 0x05, 0x38, 0x51, 0x84, 0xa6, 0x9e, 0x9d, 0xce, 0x42, 0x08, 0xf3, 0x63,
+ 0xad, 0xb0, 0xe1, 0xce, 0x88, 0x18, 0x63, 0xeb, 0x8d, 0x82, 0xd4, 0xae, 0xad, 0x5e, 0x1c, 0x19,
+ 0x50, 0x47, 0xd7, 0x0d, 0x9b, 0xdc, 0x44, 0x7b, 0xda, 0x02, 0x76, 0x84, 0xb4, 0x35, 0x1d, 0x98,
+ 0x50, 0x3f, 0xee, 0x1b, 0xcf, 0x82, 0x7f, 0xfd, 0x07, 0x50, 0x17, 0x01, 0xc7, 0xf3, 0x91, 0x24,
+ 0x22, 0xdd, 0x2f, 0x42, 0xb2, 0x6c, 0xf4, 0x0a, 0xdd, 0xe0, 0x7d, 0x63, 0xe2, 0x35, 0xf4, 0x2f,
+ 0x65, 0x21, 0x40, 0x2a, 0x90, 0xdd, 0x2c, 0xea, 0x4a, 0x2e, 0x17, 0x76, 0x40, 0x74, 0x2d, 0x3c,
+ 0xac, 0x85, 0x3e, 0x96, 0xfa, 0x49, 0x44, 0x13, 0xfe, 0xe9, 0x45, 0x97, 0x2b, 0x24, 0x23, 0xa0,
+ 0xf5, 0x1b, 0xec, 0xf2, 0x85, 0x28, 0xc9, 0xdb, 0x92, 0x60, 0x02, 0xc5, 0x0f, 0xfe, 0x2b, 0x1a,
+ 0x97, 0xc9, 0x78, 0xcf, 0x48, 0x8b, 0xa2, 0x9b, 0xbb, 0x47, 0x2e, 0x7e, 0x63, 0x28, 0x2d, 0xdd,
+ 0x32, 0x0a, 0x15, 0xa0, 0x72, 0xd8, 0x17, 0x60, 0x75, 0x20, 0x4f, 0x7d, 0xed, 0x29, 0x35, 0x61,
+};
+
+static const unsigned char dh_expected_secret[] = {
+ 0x61, 0xfc, 0x0d, 0x4d, 0x01, 0xce, 0xe1, 0x52, 0x34, 0x0f, 0x52, 0xb4, 0x53, 0x28, 0xaa, 0x11,
+ 0xd8, 0x6e, 0x92, 0xce, 0x8e, 0x8f, 0x7b, 0xa2, 0x91, 0x80, 0xf6, 0x2d, 0x99, 0x9b, 0xc7, 0x71,
+ 0x4c, 0xbb, 0x05, 0xef, 0xde, 0x22, 0xbd, 0xdf, 0x6f, 0x8d, 0xbb, 0x00, 0xdf, 0x4e, 0xfa, 0x1c,
+ 0x14, 0xea, 0x54, 0x20, 0xac, 0xec, 0x51, 0xcd, 0xbd, 0xd0, 0x63, 0xfc, 0x35, 0x7b, 0xd9, 0xab,
+ 0x36, 0x7f, 0x1b, 0x67, 0xc3, 0xb1, 0x51, 0x4e, 0x2d, 0x19, 0x05, 0x50, 0xbe, 0x1d, 0x44, 0x51,
+ 0x5f, 0xfe, 0x65, 0xf8, 0xf6, 0x12, 0xad, 0x6c, 0xc5, 0x84, 0x96, 0xd9, 0xc3, 0xc9, 0x39, 0x7d,
+ 0x87, 0x98, 0xa7, 0x8e, 0x52, 0x4d, 0x1f, 0x26, 0xbe, 0x62, 0x14, 0xf4, 0x66, 0xcf, 0x9a, 0x90,
+ 0x4d, 0x28, 0xdd, 0x29, 0x11, 0x6e, 0x51, 0x0c, 0x7b, 0x18, 0x1e, 0xac, 0x55, 0x49, 0xce, 0x1d,
+ 0xef, 0xcc, 0x6c, 0xa2, 0x0e, 0x80, 0xd3, 0x0d, 0x24, 0xc0, 0x77, 0x68, 0x87, 0xf8, 0xa3, 0x05,
+ 0x0f, 0x8d, 0xaa, 0x58, 0x6b, 0xbb, 0x6b, 0xd0, 0x76, 0xea, 0x87, 0x5c, 0xc3, 0x3e, 0xef, 0x19,
+ 0x66, 0x9e, 0xc7, 0xd4, 0x4e, 0x85, 0xdf, 0x06, 0x61, 0x0b, 0x94, 0x9c, 0xd3, 0x58, 0x23, 0xa7,
+ 0xb1, 0xf6, 0x36, 0xaf, 0x6b, 0x4c, 0xf1, 0x88, 0x40, 0xd4, 0x5f, 0x6e, 0x9d, 0x1f, 0xa7, 0x3c,
+ 0x8b, 0xc2, 0x71, 0xba, 0x87, 0xcd, 0xc2, 0x9b, 0x33, 0xcf, 0x18, 0xee, 0x59, 0x8e, 0xf6, 0x6c,
+ 0x76, 0xcc, 0xed, 0xcc, 0x09, 0xfe, 0xe1, 0xf8, 0xce, 0x5c, 0x78, 0xb3, 0xb9, 0xe3, 0xf5, 0x29,
+ 0x14, 0xaa, 0x67, 0xd0, 0xb5, 0xcb, 0x7a, 0x7e, 0xd1, 0x2e, 0x83, 0x97, 0xf1, 0x6b, 0xfb, 0xe4,
+ 0xfb, 0xeb, 0xdd, 0x18, 0x54, 0x0d, 0x4c, 0xa7, 0x65, 0xc1, 0x0c, 0x11, 0xad, 0xea, 0x83, 0x9f,
+};
+
+#endif /* KEYCTL_DH_DATA_H__ */
--
2.51.0
More information about the ltp
mailing list