From 863f996135a80ff8511360308496056ecee9e47d Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Mon, 16 Nov 2015 14:35:06 -0500
Subject: new test to exercise trng cores

---
 tests/test-trng.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 tests/test-trng.c

(limited to 'tests/test-trng.c')

diff --git a/tests/test-trng.c b/tests/test-trng.c
new file mode 100644
index 0000000..8ca64e0
--- /dev/null
+++ b/tests/test-trng.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2015, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - 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.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * 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
+ * HOLDER 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.
+ */
+
+/*
+ * NOTE: This just exercises the interface to the TRNG cores, and displays
+ * a few words of random data. It does not attempt to analyse the quality
+ * of the data; for that, use something like dieharder.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+#include <sys/time.h>
+
+#include <hal.h>
+#include <verilog_constants.h>
+
+#ifndef WAIT_FOR_CSPRNG_VALID
+#define WAIT_FOR_CSPRNG_VALID   0
+#endif
+
+static void show_core(const hal_core_t *core, const char *whinge)
+{
+  const hal_core_info_t *core_info = hal_core_info(core);
+  if (core_info != NULL)
+    printf("\"%8.8s\"  \"%4.4s\"\n", core_info->name, core_info->version);
+  else if (whinge != NULL)
+    printf("%s core not present\n", whinge);
+}
+
+static hal_error_t test_random(const char *name)
+{
+    const hal_core_t *core;
+    hal_error_t err;
+    uint32_t rnd;
+    int i;
+
+    core = hal_core_find(name, NULL);
+    show_core(core, name);
+    if (core == NULL)
+        return HAL_ERROR_CORE_NOT_FOUND;
+
+    for (i = 0; i < 8; ++i) {
+	/* The entropy sources are faster than the bus speed, so querying
+	 * the "status_valid" bit always returns true. Also, at the
+	 * moment, the trng cores use bit 0 for valid, while all the other
+	 * cores use bit 1, so we query the "status_ready" bit.
+	 */
+	if (WAIT_FOR_CSPRNG_VALID && (err = hal_io_wait_ready(core)) != HAL_OK) {
+	    printf("hal_io_wait_valid: %s\n", hal_error_string(err));
+	    return err;
+        }
+
+	/* We use symbol CSPRNG_ADDR_RANDOM here, but the entropy sources
+	 * present their data on the same register number.
+	 */
+        if ((err = hal_io_read(core, CSPRNG_ADDR_RANDOM, (uint8_t *) &rnd, sizeof(rnd))) != HAL_OK) {
+            printf("hal_io_read: %s\n", hal_error_string(err));
+            return err;
+        }
+
+        printf("%08lx ", rnd);
+    }
+    printf("\n");
+
+    return HAL_OK;
+}
+
+int main(void)
+{
+    hal_error_t err;
+    uint32_t rnd[8];
+    int i;
+
+    /* Exercise the API function. This gets random data from the CSPRNG,
+     * so we end up hitting that twice.
+     */
+    printf("hal_get_random:\n");
+    if ((err = hal_get_random(NULL, (void *) &rnd, sizeof(rnd))) != HAL_OK) {
+	printf("hal_get_random: %s\n", hal_error_string(err));
+    }
+    else {
+	for (i = 0; i < 8; ++i) {
+	    printf("%08lx ", rnd[i]);
+	}
+	printf("\n");
+    }
+
+    return
+        test_random(AVALANCHE_ENTROPY_NAME) ||
+        test_random(ROSC_ENTROPY_NAME) ||
+        test_random(CSPRNG_NAME);
+}
-- 
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