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diff --git a/src/lib/crypto/t_encrypt.c b/src/lib/crypto/t_encrypt.c
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+/*
+ * lib/crypto/t_encrypt.c
+ *
+ * Copyright2001 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ * 
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ * 
+ *
+ * <<< Description >>>
+ */
+/* 
+ * Some black-box tests of crypto systems.  Make sure that we can decrypt things we encrypt, etc.
+ */
+
+#include "k5-int.h"
+#include "etypes.h"
+#include <stdio.h>
+
+/* What enctypes should we test?*/
+krb5_enctype interesting_enctypes[] = {
+  ENCTYPE_DES_CBC_CRC,
+  ENCTYPE_DES_CBC_MD4,
+  ENCTYPE_DES_CBC_MD5,
+  ENCTYPE_DES3_CBC_SHA1,
+  ENCTYPE_ARCFOUR_HMAC,
+  ENCTYPE_ARCFOUR_HMAC_EXP,
+  0
+};
+
+#define test(msg, exp) \
+printf ("%s: . . . ", msg); \
+retval = (exp);\
+if( retval) { \
+  printf( "Failed: %s\n", error_message(retval)); \
+  abort(); \
+} else printf ("OK\n");
+  
+int main () {
+  krb5_context context ;
+  krb5_data  in, out, check;
+  int i;
+  krb5_enc_data enc_out;
+  krb5_error_code retval;
+  krb5_keyblock key;
+  in.data = "This is a test.\n";
+  in.length = strlen (in.data);
+
+  test ("Seeding random number generator",
+	krb5_c_random_seed (context, &in));
+  out.data = malloc(2048);
+  check.data = malloc(2048);
+  out.length = 2048;
+  check.length = 2048;
+  for (i = 0; interesting_enctypes[i]; i++) {
+    krb5_enctype enctype = interesting_enctypes [i];
+    printf ("Testing enctype %d\n", enctype);
+    test ("Generating random key",
+	  krb5_c_make_random_key (context, enctype, &key));
+    enc_out.ciphertext = out;
+    krb5_c_encrypt_length (context, key.enctype, in.length, &enc_out.ciphertext.length);
+    test ("Encrypting",
+	  krb5_c_encrypt (context, &key, 7, 0, &in, &enc_out));
+    test ("Decrypting",
+	  krb5_c_decrypt (context, &key, 7, 0, &enc_out, &check));
+  }
+  return 0;
+}
+
+