lib/crypto: tests: Migrate Curve25519 self-test to KUnit

Move the Curve25519 test from an ad-hoc self-test to a KUnit test.

Generally keep the same test logic for now, just translated to KUnit.
There's one exception, which is that I dropped the incomplete test of
curve25519_generic().  The approach I'm taking to cover the different
implementations with the KUnit tests is to just rely on booting kernels
in QEMU with different '-cpu' options, rather than try to make the tests
(incompletely) test multiple implementations on one CPU.  This way, both
the test and the library API are simpler.

This commit makes the file lib/crypto/curve25519.c no longer needed, as
its only purpose was to call the self-test.  However, keep it for now,
since a later commit will add code to it again.

Temporarily omit the default value of CRYPTO_SELFTESTS that the other
lib/crypto/ KUnit tests have.  It would cause a recursive kconfig
dependency, since the Curve25519 code is still entangled with CRYPTO.  A
later commit will fix that.

Link: https://lore.kernel.org/r/20250906213523.84915-8-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

include/crypto/curve25519.h

@@ -28,8 +28,6 @@ void curve25519_arch(u8 out[CURVE25519_KEY_SIZE],
 void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
 			  const u8 secret[CURVE25519_KEY_SIZE]);
 
-bool curve25519_selftest(void);
-
 static inline
 bool __must_check curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
 			     const u8 secret[CURVE25519_KEY_SIZE],

lib/crypto/Makefile

@@ -87,7 +87,6 @@ endif
 
 obj-$(CONFIG_CRYPTO_LIB_CURVE25519)		+= libcurve25519.o
 libcurve25519-y					+= curve25519.o
-libcurve25519-$(CONFIG_CRYPTO_SELFTESTS)	+= curve25519-selftest.o
 
 obj-$(CONFIG_CRYPTO_LIB_DES)			+= libdes.o
 libdes-y					:= des.o

lib/crypto/curve25519.c

@@ -15,9 +15,6 @@
 
 static int __init curve25519_init(void)
 {
-	if (IS_ENABLED(CONFIG_CRYPTO_SELFTESTS) &&
-	    WARN_ON(!curve25519_selftest()))
-		return -ENODEV;
 	return 0;
 }
 

lib/crypto/tests/Kconfig

@@ -10,6 +10,15 @@ config CRYPTO_LIB_BLAKE2S_KUNIT_TEST
 	help
 	  KUnit tests for the BLAKE2s cryptographic hash function.
 
+config CRYPTO_LIB_CURVE25519_KUNIT_TEST
+	tristate "KUnit tests for Curve25519" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	select CRYPTO_LIB_CURVE25519
+	help
+	  KUnit tests for the Curve25519 Diffie-Hellman function.
+
 config CRYPTO_LIB_MD5_KUNIT_TEST
 	tristate "KUnit tests for MD5" if !KUNIT_ALL_TESTS
 	depends on KUNIT

lib/crypto/tests/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 obj-$(CONFIG_CRYPTO_LIB_BLAKE2S_KUNIT_TEST) += blake2s_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_CURVE25519_KUNIT_TEST) += curve25519_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_MD5_KUNIT_TEST) += md5_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_POLY1305_KUNIT_TEST) += poly1305_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_SHA1_KUNIT_TEST) += sha1_kunit.o

lib/crypto/tests/curve25519_kunit.c

@@ -4,6 +4,7 @@
  */
 
 #include <crypto/curve25519.h>
+#include <kunit/test.h>
 
 struct curve25519_test_vector {
 	u8 private[CURVE25519_KEY_SIZE];
@@ -11,7 +12,7 @@ struct curve25519_test_vector {
 	u8 result[CURVE25519_KEY_SIZE];
 	bool valid;
 };
-static const struct curve25519_test_vector curve25519_test_vectors[] __initconst = {
+static const struct curve25519_test_vector curve25519_test_vectors[] = {
 	{
 		.private = { 0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d,
 			     0x3c, 0x16, 0xc1, 0x72, 0x51, 0xb2, 0x66, 0x45,
@@ -1280,42 +1281,52 @@ static const struct curve25519_test_vector curve25519_test_vectors[] __initconst
 	}
 };
 
-bool __init curve25519_selftest(void)
+static void test_curve25519(struct kunit *test)
 {
-	bool success = true, ret, ret2;
+	for (size_t i = 0; i < ARRAY_SIZE(curve25519_test_vectors); ++i) {
-	size_t i = 0, j;
+		const struct curve25519_test_vector *vec =
-	u8 in[CURVE25519_KEY_SIZE];
+			&curve25519_test_vectors[i];
-	u8 out[CURVE25519_KEY_SIZE], out2[CURVE25519_KEY_SIZE],
+		u8 out[CURVE25519_KEY_SIZE] = {};
-	   out3[CURVE25519_KEY_SIZE];
+		bool ret;
 
-	for (i = 0; i < ARRAY_SIZE(curve25519_test_vectors); ++i) {
+		ret = curve25519(out, vec->private, vec->public);
-		memset(out, 0, CURVE25519_KEY_SIZE);
+		KUNIT_EXPECT_EQ_MSG(test, ret, vec->valid,
-		ret = curve25519(out, curve25519_test_vectors[i].private,
+				    "Wrong return value with test vector %zu",
-				 curve25519_test_vectors[i].public);
+				    i);
-		if (ret != curve25519_test_vectors[i].valid ||
+		KUNIT_EXPECT_MEMEQ_MSG(test, out, vec->result, sizeof(out),
-		    memcmp(out, curve25519_test_vectors[i].result,
+				       "Wrong output with test vector %zu", i);
-			   CURVE25519_KEY_SIZE)) {
-			pr_err("curve25519 self-test %zu: FAIL\n", i + 1);
-			success = false;
-		}
 	}
+}
+
+static void test_curve25519_basepoint(struct kunit *test)
+{
+	for (size_t i = 0; i < 5; ++i) {
+		u8 in[CURVE25519_KEY_SIZE];
+		u8 out[CURVE25519_KEY_SIZE];
+		u8 out2[CURVE25519_KEY_SIZE];
+		bool ret, ret2;
 
-	for (i = 0; i < 5; ++i) {
 		get_random_bytes(in, sizeof(in));
 		ret = curve25519_generate_public(out, in);
 		ret2 = curve25519(out2, in, (u8[CURVE25519_KEY_SIZE]){ 9 });
-		curve25519_generic(out3, in, (u8[CURVE25519_KEY_SIZE]){ 9 });
+		KUNIT_EXPECT_EQ_MSG(test, ret, ret2,
-		if (ret != ret2 ||
+				    "in=%*phN", CURVE25519_KEY_SIZE, in);
-		    memcmp(out, out2, CURVE25519_KEY_SIZE) ||
+		KUNIT_EXPECT_MEMEQ_MSG(test, out, out2, CURVE25519_KEY_SIZE,
-		    memcmp(out, out3, CURVE25519_KEY_SIZE)) {
+				       "in=%*phN", CURVE25519_KEY_SIZE, in);
-			pr_err("curve25519 basepoint self-test %zu: FAIL: input - 0x",
-			       i + 1);
-			for (j = CURVE25519_KEY_SIZE; j-- > 0;)
-				printk(KERN_CONT "%02x", in[j]);
-			printk(KERN_CONT "\n");
-			success = false;
-		}
 	}
-
-	return success;
 }
+
+static struct kunit_case curve25519_test_cases[] = {
+	KUNIT_CASE(test_curve25519),
+	KUNIT_CASE(test_curve25519_basepoint),
+	{},
+};
+
+static struct kunit_suite curve25519_test_suite = {
+	.name = "curve25519",
+	.test_cases = curve25519_test_cases,
+};
+kunit_test_suite(curve25519_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for Curve25519");
+MODULE_LICENSE("GPL");