gendsa: dsaparam: introduce -verbose option to enable output

[openssl.git] / apps / gendsa.c

diff --git a/apps/gendsa.c b/apps/gendsa.c
index 14bfeacd8f47fd0e394ae5059d4374afdd0869d4..9671b23424929cb41b89682e4746d92c81b9adc2 100644 (file)
--- a/apps/gendsa.c
+++ b/apps/gendsa.c
@@ -1,7 +1,7 @@
 /*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
- * Licensed under the OpenSSL license (the "License").  You may not use
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
@@ -27,7 +27,7 @@ NON_EMPTY_TRANSLATION_UNIT
 
 typedef enum OPTION_choice {
     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
-    OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER,
+    OPT_OUT, OPT_PASSOUT, OPT_ENGINE, OPT_CIPHER, OPT_VERBOSE,
     OPT_R_ENUM
 } OPTION_CHOICE;
 
@@ -42,6 +42,7 @@ const OPTIONS gendsa_options[] = {
 # ifndef OPENSSL_NO_ENGINE
     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 # endif
+    {"verbose", OPT_VERBOSE, '-', "Verbose output"},
     {NULL}
 };
 
@@ -54,7 +55,7 @@ int gendsa_main(int argc, char **argv)
     char *dsaparams = NULL;
     char *outfile = NULL, *passoutarg = NULL, *passout = NULL, *prog;
     OPTION_CHOICE o;
-    int ret = 1, private = 0;
+    int ret = 1, private = 0, verbose = 0;
     const BIGNUM *p = NULL;
 
     prog = opt_init(argc, argv, gendsa_options);
@@ -86,6 +87,9 @@ int gendsa_main(int argc, char **argv)
             if (!opt_cipher(opt_unknown(), &enc))
                 goto end;
             break;
+        case OPT_VERBOSE:
+            verbose = 1;
+            break;
         }
     }
     argc = opt_num_rest();
@@ -117,7 +121,15 @@ int gendsa_main(int argc, char **argv)
         goto end2;
 
     DSA_get0_pqg(dsa, &p, NULL, NULL);
-    BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
+
+    if (BN_num_bits(p) > OPENSSL_DSA_MAX_MODULUS_BITS)
+        BIO_printf(bio_err,
+                   "Warning: It is not recommended to use more than %d bit for DSA keys.\n"
+                   "         Your key size is %d! Larger key size may behave not as expected.\n",
+                   OPENSSL_DSA_MAX_MODULUS_BITS, BN_num_bits(p));
+
+    if (verbose)
+        BIO_printf(bio_err, "Generating DSA key, %d bits\n", BN_num_bits(p));
     if (!DSA_generate_key(dsa))
         goto end;