Diff: mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c

Revision:

18:6a4db94011d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/crypto/crypto-misc.c	Sun May 14 23:18:57 2017 +0000
@@ -0,0 +1,63 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015-2016 Nuvoton
+ *
+ * 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.
+ */
+
+
+#include "cmsis.h"
+#include "mbed_assert.h"
+#include "nu_modutil.h"
+#include "nu_bitutil.h"
+#include "crypto-misc.h"
+
+static int crypto_inited = 0;
+static int crypto_sha_avail = 1;
+
+void crypto_init(void)
+{
+    if (crypto_inited) {
+        return;
+    }
+    crypto_inited = 1;
+    
+    CLK_EnableModuleClock(CRPT_MODULE);
+}
+
+/* Implementation that should never be optimized out by the compiler */
+void crypto_zeroize(void *v, size_t n)
+{
+    volatile unsigned char *p = (unsigned char*) v;
+    while (n--) {
+        *p++ = 0;
+    }
+}
+
+int crypto_sha_acquire(void)
+{
+    if (crypto_sha_avail) {
+        crypto_sha_avail = 0;
+        return 1;
+    }
+    else {
+        return 0;
+    }
+    
+}
+
+void crypto_sha_release(void)
+{
+    if (! crypto_sha_avail) {
+        crypto_sha_avail = 1;
+    }
+}