boringssl: Implement sysrand from TRNG

The boringssl doesn't include the TRNG implementation, we need our own
CRYPTO_sysrand.

BUG=b:248508087
TEST=make V=1 BOARD=bloonchipper -j
TEST=./test/run_device_tests.py --board bloonchipper -t boringssl_crypto
     => PASS
TEST=./test/run_device_tests.py --board dartmonkey -t boringssl_crypto
     => PASS

Change-Id: I3136bcc96e09f674278bf338297d7bc0576e174c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4496289
Reviewed-by: Tom Hughes <tomhughes@chromium.org>
Commit-Queue: Yi Chou <yich@google.com>
Tested-by: Yi Chou <yich@google.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/test/boringssl_crypto.cc b/test/boringssl_crypto.cc
new file mode 100644
index 0000000000..bc7bd5dffe
--- /dev/null
+++ b/test/boringssl_crypto.cc
@@ -0,0 +1,35 @@
+/* Copyright 2023 The ChromiumOS Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "common.h"
+#include "openssl/bn.h"
+#include "openssl/ec.h"
+#include "openssl/mem.h"
+#include "openssl/obj_mac.h"
+#include "openssl/rand.h"
+#include "test_util.h"
+#include "util.h"
+
+test_static enum ec_error_list test_rand(void)
+{
+	constexpr uint8_t zero[256] = { 0 };
+	uint8_t buf1[256];
+	uint8_t buf2[256];
+
+	RAND_bytes(buf1, sizeof(buf1));
+	RAND_bytes(buf2, sizeof(buf2));
+
+	TEST_ASSERT_ARRAY_NE(buf1, zero, sizeof(zero));
+	TEST_ASSERT_ARRAY_NE(buf2, zero, sizeof(zero));
+	TEST_ASSERT_ARRAY_NE(buf1, buf2, sizeof(buf1));
+
+	return EC_SUCCESS;
+}
+
+extern "C" void run_test(int argc, const char **argv)
+{
+	RUN_TEST(test_rand);
+	test_print_result();
+}