Add current version of libSRTP from CVS.

libsrtp/crypto/test/rand_gen.c

+/*
+ * rand_gen.c
+ *
+ * a random source (random number generator)
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+/*
+ *      
+ * Copyright(c) 2001-2006 Cisco Systems, Inc.
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ * 
+ *   Neither the name of the Cisco Systems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#include <stdio.h>           /* for printf() */
+#include <unistd.h>          /* for getopt() */
+#include "crypto_kernel.h"
+
+/*
+ * MAX_PRINT_STRING_LEN is defined in datatypes.h, and is the length
+ * of the largest hexadecimal string that can be generated by the
+ * function octet_string_hex_string().
+ */
+
+#define BUF_LEN (MAX_PRINT_STRING_LEN/2)
+
+void
+usage(char *prog_name) {
+  printf("usage: %s -n <num_bytes> [-l][ -d debug_module ]*\n"
+         "   -n <num>   output <num> random bytes, where <num>"
+         " is between zero and %d\n"
+         "   -l         list the avaliable debug modules\n"
+         "   -d <mod>   turn on debugging module <mod>\n", 
+         prog_name, BUF_LEN);
+  exit(255);
+}
+
+int
+main (int argc, char *argv[]) {
+  extern char *optarg;
+  int q;
+  int num_octets = 0;
+  unsigned do_list_mods = 0;
+  err_status_t status;
+
+  if (argc == 1)
+    usage(argv[0]);
+
+  /* initialize kernel - we need to do this before anything else */ 
+  status = crypto_kernel_init();
+  if (status) {
+    printf("error: crypto_kernel init failed\n");
+    exit(1);
+  }
+
+  /* process input arguments */
+  while (1) {
+    q = getopt(argc, argv, "ld:n:");
+    if (q == -1) 
+      break;
+    switch (q) {
+    case 'd':
+      status = crypto_kernel_set_debug_module(optarg, 1);
+      if (status) {
+        printf("error: set debug module (%s) failed\n", optarg);
+        exit(1);
+      }
+      break;
+    case 'l':
+      do_list_mods = 1;
+      break;
+    case 'n':
+      num_octets = atoi(optarg);
+      if (num_octets < 0 || num_octets > BUF_LEN)
+        usage(argv[0]);
+      break;
+    default:
+      usage(argv[0]);
+    }    
+  }
+
+  if (do_list_mods) {
+    status = crypto_kernel_list_debug_modules();
+    if (status) {
+      printf("error: list of debug modules failed\n");
+      exit(1);
+    }
+  }
+
+  if (num_octets > 0) {
+    uint8_t buffer[BUF_LEN];
+    
+    status = crypto_get_random(buffer, num_octets);
+    if (status) {
+      printf("error: failure in random source\n");
+    } else {
+      printf("%s\n", octet_string_hex_string(buffer, num_octets));
+    }
+  }
+
+  status = crypto_kernel_shutdown();
+  if (status) {
+    printf("error: crypto_kernel shutdown failed\n");
+    exit(1);
+  }
+  
+  return 0;
+}
+