--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/test/dh_tests.c	Tue Jun 15 14:07:21 2004 +0000
@@ -0,0 +1,87 @@
+#include "test.h"
+
+int dh_tests (void)
+{
+  unsigned char buf[3][4096];
+  unsigned long x, y, z;
+  int           stat, stat2;
+  dh_key        usera, userb;
+
+  DO(dh_test());
+
+  /* make up two keys */
+  DO(dh_make_key (&test_yarrow, find_prng ("yarrow"), 96, &usera));
+  DO(dh_make_key (&test_yarrow, find_prng ("yarrow"), 96, &userb));
+
+  /* make the shared secret */
+  x = 4096;
+  DO(dh_shared_secret (&usera, &userb, buf[0], &x));
+
+  y = 4096;
+  DO(dh_shared_secret (&userb, &usera, buf[1], &y));
+  if (y != x) {
+    printf ("DH Shared keys are not same size.\n");
+    return 1;
+  }
+  if (memcmp (buf[0], buf[1], x)) {
+    printf ("DH Shared keys not same contents.\n");
+    return 1;
+  }
+
+  /* now export userb */
+  y = 4096;
+  DO(dh_export (buf[1], &y, PK_PUBLIC, &userb));
+	  dh_free (&userb);
+
+  /* import and make the shared secret again */
+  DO(dh_import (buf[1], y, &userb));
+  z = 4096;
+  DO(dh_shared_secret (&usera, &userb, buf[2], &z));
+
+  if (z != x) {
+    printf ("failed.  Size don't match?\n");
+    return 1;
+  }
+  if (memcmp (buf[0], buf[2], x)) {
+    printf ("Failed.  Content didn't match.\n");
+    return 1;
+  }
+  dh_free (&usera);
+  dh_free (&userb);
+
+/* test encrypt_key */
+  dh_make_key (&test_yarrow, find_prng ("yarrow"), 128, &usera);
+  for (x = 0; x < 16; x++) {
+    buf[0][x] = x;
+  }
+  y = sizeof (buf[1]);
+  DO(dh_encrypt_key (buf[0], 16, buf[1], &y, &test_yarrow, find_prng ("yarrow"), find_hash ("md5"), &usera));
+  zeromem (buf[0], sizeof (buf[0]));
+  x = sizeof (buf[0]);
+  DO(dh_decrypt_key (buf[1], y, buf[0], &x, &usera));
+  if (x != 16) {
+    printf ("Failed (length)\n");
+    return 1;
+  }
+  for (x = 0; x < 16; x++)
+    if (buf[0][x] != x) {
+      printf ("Failed (contents)\n");
+      return 1;
+    }
+
+/* test sign_hash */
+  for (x = 0; x < 16; x++) {
+     buf[0][x] = x;
+  }
+  x = sizeof (buf[1]);
+  DO(dh_sign_hash (buf[0], 16, buf[1], &x, &test_yarrow		, find_prng ("yarrow"), &usera));
+  DO(dh_verify_hash (buf[1], x, buf[0], 16, &stat, &usera));
+  buf[0][0] ^= 1;
+  DO(dh_verify_hash (buf[1], x, buf[0], 16, &stat2, &usera));
+  if (!(stat == 1 && stat2 == 0)) { 
+     printf("dh_sign/verify_hash %d %d", stat, stat2);
+     return 1;
+  }
+  dh_free (&usera);
+  return 0;
+}