1 files changed, 53 insertions, 0 deletions
diff --git a/src/tests/rng-randomness.cpp b/src/tests/rng-randomness.cpp
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+++ b/src/tests/rng-randomness.cpp
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+/*
+ * Copyright (c) 2017-2022 [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ * 2.  Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rnp/rnp.h>
+#include "rnp_tests.h"
+#include <string.h>
+#include "support.h"
+
+TEST_F(rnp_tests, test_rng_randomness)
+{
+    uint8_t samples[4096];
+
+    memset(samples, 0, sizeof(samples));
+
+    // Repetition Count Test, see NIST SP 800-90B
+    const size_t C = 6; // cutoff value
+    size_t       B = 1;
+    uint8_t      A;
+    global_ctx.rng.get(samples, sizeof(samples));
+    A = samples[0];
+    for (size_t i = 1; i < sizeof(samples); i++) {
+        if (samples[i] == A) {
+            B++;
+            assert_int_not_equal(B, C);
+        } else {
+            A = samples[i];
+            B = 1;
+        }
+    }
+}