Add timing_alt.c for POSIX

Author: hasumikin

mrbgems/picoruby-mbedtls/mrbgem.rake

@@ -36,5 +36,7 @@ MRuby::Gem::Specification.new('picoruby-mbedtls') do |spec|
   if build.posix?
     cc.defines << "PICORB_PLATFORM_POSIX"
   end
+
+  spec.posix
 end
 

mrbgems/picoruby-mbedtls/ports/posix/timing_alt.c

@@ -0,0 +1,67 @@
+#include <time.h>
+#include <stdint.h>
+#include <sys/time.h>
+
+typedef struct {
+  struct timespec end_time;
+  int             int_ms;
+  int             fin_ms;
+  int             active;
+} timing_delay_context;
+
+void
+mbedtls_timing_set_delay(void *data, uint32_t int_ms, uint32_t fin_ms)
+{
+  timing_delay_context *ctx = (timing_delay_context *)data;
+
+  ctx->int_ms = (int)int_ms;
+  ctx->fin_ms = (int)fin_ms;
+  ctx->active = 1;
+
+  if (fin_ms == 0) {
+    // Cancel
+    ctx->active = 0;
+    return;
+  }
+
+  // current time + fin_ms = end_time
+  struct timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  ctx->end_time.tv_sec = now.tv_sec + fin_ms / 1000;
+  ctx->end_time.tv_nsec = now.tv_nsec + (fin_ms % 1000) * 1000000;
+  if (ctx->end_time.tv_nsec >= 1000000000) {
+    ctx->end_time.tv_sec += 1;
+    ctx->end_time.tv_nsec -= 1000000000;
+  }
+}
+
+int
+mbedtls_timing_get_delay(void *data)
+{
+  timing_delay_context *ctx = (timing_delay_context *)data;
+
+  if (ctx->fin_ms == 0 || !ctx->active) return -1;
+
+  struct timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+
+  int64_t elapsed_ms = (ctx->end_time.tv_sec - now.tv_sec) * 1000 +
+                        (ctx->end_time.tv_nsec - now.tv_nsec) / 1000000;
+
+  if (elapsed_ms <= -ctx->fin_ms) {
+    return 2; // Final delay has passed
+  } else if (elapsed_ms <= -ctx->int_ms) {
+    return 1; // Intermediate delay has passed
+  } else {
+    return 0; // Still active, but no delay
+  }
+}
+
+// Stub
+unsigned long
+mbedtls_timing_hardclock(void)
+{
+  static unsigned long counter = 0;
+  return ++counter;
+}
+