From 48026bb824fd2d9cfb00ecd040db6ef3a416bae9 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Fri, 22 Jan 2021 21:43:36 -0500
Subject: upload initial port

---
 ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c

(limited to 'ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c')

diff --git a/ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c b/ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c
new file mode 100644
index 0000000..ca11e48
--- /dev/null
+++ b/ChibiOS_20.3.2/os/various/wolfssl_bindings/hwrng.c
@@ -0,0 +1,80 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+/*
+ * **** This file incorporates work covered by the following copyright and ****
+ * **** permission notice:                                                 ****
+ *
+ * Copyright (C) 2006-2017 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ *
+ */
+#include <ch.h>
+#include <stdint.h>
+#include "wolfssl_chibios.h"
+#include "user_settings.h"
+
+unsigned int chibios_rand_generate(void)
+{
+  static unsigned int last_value=0;
+  static unsigned int new_value=0;
+  unsigned int error_bits = 0;
+  error_bits = RNG_SR_SEIS | RNG_SR_CEIS;
+  while (new_value==last_value) {
+    /* Check for error flags and if data is ready. */
+    if ( ((RNG->SR & error_bits) == 0) && ( (RNG->SR & RNG_SR_DRDY) == 1 ) )
+      new_value=RNG->DR;
+  }
+  last_value=new_value;
+  return new_value;
+}
+
+int custom_rand_generate_block(unsigned char* output, unsigned int sz)
+{
+    uint32_t i = 0;
+
+    while (i < sz)
+    {
+        /* If not aligned or there is odd/remainder */
+        if( (i + sizeof(CUSTOM_RAND_TYPE)) > sz ||
+            ((uint32_t)&output[i] % sizeof(CUSTOM_RAND_TYPE)) != 0
+        ) {
+            /* Single byte at a time */
+            output[i++] = (unsigned char)chibios_rand_generate();
+        }
+        else {
+            /* Use native 8, 16, 32 or 64 copy instruction */
+            *((CUSTOM_RAND_TYPE*)&output[i]) = chibios_rand_generate();
+            i += sizeof(CUSTOM_RAND_TYPE);
+        }
+    }
+    return 0;
+}
+
-- 
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