Make crypto benchmark output compatible with autotest.

src/platform/vboot_reference/tests/rsa_verify_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 "file_keys.h"
 #include "padding.h"
 #include "rsa.h"
 #include "timer_utils.h"
 #include "utility.h"
 
 #define FILE_NAME_SIZE 128
 #define NUM_OPERATIONS 100 /* Number of signature operations to time. */
 
-void SpeedTestAlgorithm(int algorithm) {
+int SpeedTestAlgorithm(int algorithm) {
   int i, key_size;
+  int error_code = 0;
   double speed, msecs;
   char file_name[FILE_NAME_SIZE];
   uint8_t* digest = NULL;
   uint8_t* signature = NULL;
   int digest_len;
   int sig_len;
   RSAPublicKey* key = NULL;
   ClockTimerState ct;
   char* sha_strings[] = {  /* Maps algorithm->SHA algorithm. */
     "sha1", "sha256", "sha512",  /* RSA-1024 */
     "sha1", "sha256", "sha512",  /* RSA-2048 */
     "sha1", "sha256", "sha512",  /* RSA-4096 */
     "sha1", "sha256", "sha512",  /* RSA-8192 */
   };
 
   key_size = siglen_map[algorithm] * sizeof(uint32_t) * 8;  /* in bits. */
   /* Get key. */
   snprintf(file_name, FILE_NAME_SIZE, "testkeys/key_rsa%d.keyb", key_size);
   key = RSAPublicKeyFromFile(file_name);
   if (!key) {
     fprintf(stderr, "Couldn't read key from file.\n");
+    error_code = 1;
     goto failure;
   }
 
   /* Get expected digest. */
   snprintf(file_name, FILE_NAME_SIZE, "testcases/test_file.%s.digest",
            sha_strings[algorithm]);
   digest = BufferFromFile(file_name, &digest_len);
   if (!digest) {
     fprintf(stderr, "Couldn't read digest file.\n");
+    error_code = 1;
     goto failure;
   }
 
   /* Get signature to verify against. */
   snprintf(file_name, FILE_NAME_SIZE, "testcases/test_file.rsa%d_%s.sig",
            key_size, sha_strings[algorithm]);
   signature = BufferFromFile(file_name, &sig_len);
   if (!signature) {
     fprintf(stderr, "Couldn't read signature file.\n");
+    error_code = 1;
     goto failure;
   }
 
   StartTimer(&ct);
   for (i = 0; i < NUM_OPERATIONS; i++) {
     if (!RSA_verify(key, signature, sig_len, algorithm, digest))
       fprintf(stderr, "Warning: Signature Check Failed.\n");
   }
   StopTimer(&ct);
 
   msecs = (float) GetDurationMsecs(&ct) / NUM_OPERATIONS;
   speed = 1000.0 / msecs ;
-  fprintf(stderr, "rsa%d/%s bits:\tTime taken per verification = %.02f ms,"
+  fprintf(stderr, "# rsa%d/%s:\tTime taken per verification = %.02f ms,"
           " Speed = %.02f verifications/s\n", key_size, sha_strings[algorithm],
           msecs, speed);
+  fprintf(stdout, "rsa%d/%s:%.02f\n", key_size, sha_strings[algorithm], msecs);
 
 failure:
   Free(signature);
   Free(digest);
   Free(key);
+  return error_code;
 }
 
 int main(int argc, char* argv[]) {
   int i;
+  int error_code = 0;
   for (i = 0; i < kNumAlgorithms; ++i) {
-    SpeedTestAlgorithm(i);
+    if(SpeedTestAlgorithm(i))
+      error_code = 1;
   }
-  return 0;
+  return error_code;
 }