first commit for opensource

first commit for opensource

components/security/mbedtls/wrapper/src/timing_alt.c

@@ -0,0 +1,74 @@
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include "tos.h"
+#include "timing_alt.h"
+
+unsigned long mbedtls_timing_get_timer(struct mbedtls_timing_hr_time *val, int reset)
+{
+    struct mbedtls_timing_hr_time now;
+
+    now.timer_ms = tos_systick_get();
+
+    if (reset) {
+        val->timer_ms = now.timer_ms;
+    }
+
+    return (unsigned long)(now.timer_ms - val->timer_ms);
+}
+
+/*
+ * Set delays to watch
+ */
+void mbedtls_timing_set_delay(void *data, uint32_t int_ms, uint32_t fin_ms)
+{
+    mbedtls_timing_delay_context *ctx;
+
+    if (!data) {
+        return;
+    }
+
+    ctx = (mbedtls_timing_delay_context*)data;
+
+    ctx->int_ms = int_ms;
+    ctx->fin_ms = fin_ms;
+
+    if (fin_ms != 0) {
+        (void)mbedtls_timing_get_timer(&ctx->timer, 1);
+    }
+}
+
+/*
+ * Get number of delays expired
+ */
+int mbedtls_timing_get_delay(void *data)
+{
+    unsigned long elapsed_ms;
+    mbedtls_timing_delay_context *ctx;
+
+    if (!data) {
+        return -1;
+    }
+
+    ctx = (mbedtls_timing_delay_context*)data;
+
+    if (ctx->fin_ms == 0) {
+        return -1;
+    }
+
+    elapsed_ms = mbedtls_timing_get_timer(&ctx->timer, 0);
+
+    if (elapsed_ms >= ctx->fin_ms) {
+        return 2;
+    }
+
+    if (elapsed_ms >= ctx->int_ms) {
+        return 1;
+    }
+
+    return 0;
+}
+