SHA* digest function speed test.

src/platform/vboot_reference/tests/sha_benchmark.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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "sha.h"
+#include "timer_utils.h"
+#include "utility.h"
+
+#define NUM_HASH_ALGORITHMS 3
+#define TEST_BUFFER_SIZE 4000000
+
+/* Table of hash function pointers and their description. */
+typedef uint8_t* (*Hashptr) (const uint8_t*, int, uint8_t*);
+typedef struct HashFxTable {
+  Hashptr hash;
+  char* description;
+} HashFxTable;
+
+HashFxTable hash_functions[NUM_HASH_ALGORITHMS] = {
+  {SHA1, "SHA1"},
+  {SHA256, "SHA256"},
+  {SHA512, "SHA512"}
+};
+
+int main(int argc, char* argv[]) {
+  int i;
+  double speed;
+  uint32_t msecs;
+  uint8_t* buffer = (uint8_t*) Malloc(TEST_BUFFER_SIZE);
+  uint8_t* digest = (uint8_t*) Malloc(SHA512_DIGEST_SIZE); /* Maximum size of
+                                                            * the digest. */
+  ClockTimerState ct;
+
+  /* Iterate through all the hash functions. */
+  for(i = 0; i < NUM_HASH_ALGORITHMS; i++) {
+    StartTimer(&ct);
+    hash_functions[i].hash(buffer, TEST_BUFFER_SIZE, digest);
+    StopTimer(&ct);
+
+    msecs = GetDurationMsecs(&ct);
+    speed = ((TEST_BUFFER_SIZE / 10e6)
+             / (msecs / 10e3)); /* Mbytes/sec */
+
+    fprintf(stderr, "%s Time taken = %u ms, Speed = %f Mbytes/sec\n",
+            hash_functions[i].description, msecs, speed);
+  }
+
+  Free(digest);
+  Free(buffer);
+  return 0;
+}