- (djm) OpenBSD CVS Sync

   - markus@cvs.openbsd.org 2005/10/07 11:13:57
     [ssh-keygen.c]
     change DSA default back to 1024, as it's defined for 1024 bits only
     and this causes interop problems with other clients.  moreover,
     in order to improve the security of DSA you need to change more
     components of DSA key generation (e.g. the internal SHA1 hash);
     ok deraadt

1 files changed, 9 insertions, 3 deletions

diff --git a/ssh-keygen.c b/ssh-keygen.c
index 92803da45..89686f5ac 100644
--- a/ssh-keygen.c
+++ b/ssh-keygen.c
@@ -12,7 +12,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: ssh-keygen.c,v 1.129 2005/09/13 23:40:07 djm Exp $");
+RCSID("$OpenBSD: ssh-keygen.c,v 1.130 2005/10/07 11:13:57 markus Exp $");
 
 #include <openssl/evp.h>
 #include <openssl/pem.h>
@@ -35,8 +35,10 @@ RCSID("$OpenBSD: ssh-keygen.c,v 1.129 2005/09/13 23:40:07 djm Exp $");
 #endif
 #include "dns.h"
 
-/* Number of bits in the RSA/DSA key.  This value can be changed on the command line. */
-u_int32_t bits = 2048;
+/* Number of bits in the RSA/DSA key.  This value can be set on the command line. */
+#define DEFAULT_BITS            2048
+#define DEFAULT_BITS_DSA        1024
+u_int32_t bits = 0;
 
 /*
  * Flag indicating that we just want to change the passphrase.  This can be
@@ -1217,6 +1219,8 @@ main(int ac, char **av)
                             out_file, strerror(errno));
                         return (1);
                 }
+                if (bits == 0)
+                        bits = DEFAULT_BITS;
                 if (gen_candidates(out, memory, bits, start) != 0)
                         fatal("modulus candidate generation failed\n");
 
@@ -1258,6 +1262,8 @@ main(int ac, char **av)
         }
         if (!quiet)
                 printf("Generating public/private %s key pair.\n", key_type_name);
+        if (bits == 0)
+                bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
         private = key_generate(type, bits);
         if (private == NULL) {
                 fprintf(stderr, "key_generate failed");