Vboot Reference: Add the "real" reference firmware verification function (VerifyFirmware).

src/platform/vboot_reference/common/utility_stub.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Stub implementations of utility functions which call their linux-specific
  * equivalents.
  */
 
 #include "utility.h"
 
@@ skipping 12 matching lines @@
 void Free(void* ptr) {
   free(ptr);
 }
 
 void* Memcpy(void* dest, const void* src, size_t n) {
   return memcpy(dest, src, n);
 }
 
 void* Memset(void* dest, const uint8_t c, size_t n) {
   while (n--) {
-    *((uint8_t*)dest) = c;
+    *((uint8_t*)dest++) = c;
   }
   return dest;
 }
 
 int SafeMemcmp(const void* s1, const void* s2, size_t n) {
-  int match = 1;
+  int match = 0;
   const unsigned char* us1 = s1;
   const unsigned char* us2 = s2;
   while (n--) {
     if (*us1++ != *us2++)
-      match = 0;
-    else
       match = 1;
   }
 
   return match;
 }
 
 void* StatefulMemcpy(MemcpyState* state, void* dst, int len) {
   void* saved_ptr;
   if (len > state->remaining_len) {
     state->remaining_len = -1;
     return NULL;
   }
   saved_ptr = state->remaining_buf;
   Memcpy(dst, saved_ptr, len);
   state->remaining_buf += len;
   state->remaining_len -= len;
   return dst;
 }