* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
+/* ====================================================================
+ * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
#ifndef NO_DH
#include <stdio.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
+#ifndef NO_DSA
+#include <openssl/dsa.h>
+#endif
+
#undef PROG
#define PROG dhparam_main
* -outform arg - output format - default PEM
* -in arg - input file - default stdin
* -out arg - output file - default stdout
+ * -dsaparam - read or generate DSA parameters, convert to DH
* -check - check the parameters are ok
* -noout
* -text
{
DH *dh=NULL;
int i,badops=0,text=0;
+#ifndef NO_DSA
+ int dsaparam=0;
+#endif
BIO *in=NULL,*out=NULL;
int informat,outformat,check=0,noout=0,C=0,ret=1;
char *infile,*outfile,*prog;
check=1;
else if (strcmp(*argv,"-text") == 0)
text=1;
+#ifndef NO_DSA
+ else if (strcmp(*argv,"-dsaparam") == 0)
+ dsaparam=1;
+#endif
else if (strcmp(*argv,"-C") == 0)
C=1;
else if (strcmp(*argv,"-noout") == 0)
BIO_printf(bio_err," -outform arg output format - one of DER PEM\n");
BIO_printf(bio_err," -in arg input file\n");
BIO_printf(bio_err," -out arg output file\n");
+#ifndef NO_DSA
+ BIO_printf(bio_err," -dsaparam read or generate DSA parameters, convert to DH\n");
+#endif
BIO_printf(bio_err," -check check the DH parameters\n");
BIO_printf(bio_err," -text print a text form of the DH parameters\n");
BIO_printf(bio_err," -C Output C code\n");
ERR_load_crypto_strings();
- if(g && !num) num = DEFBITS;
- else if(num && !g) g = 2;
+ if (g && !num)
+ num = DEFBITS;
+
+#ifndef NO_DSA
+ if (dsaparam)
+ {
+ if (g)
+ {
+ BIO_printf(bio_err, "generator may not be chosen for DSA parameters\n");
+ goto end;
+ }
+ }
+ else
+#endif
+ {
+ /* DH parameters */
+ if (num && !g)
+ g = 2;
+ }
if(num) {
BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
app_RAND_load_files(inrand));
- BIO_printf(bio_err,"Generating DH parameters, %d bit long strong prime, generator of %d\n",num,g);
- BIO_printf(bio_err,"This is going to take a long time\n");
- dh=DH_generate_parameters(num,g,dh_cb,bio_err);
+#ifndef NO_DSA
+ if (dsaparam)
+ {
+ DSA *dsa;
+
+ BIO_printf(bio_err,"Generating DSA parameters, %d bit long prime\n",num);
+ dsa = DSA_generate_parameters(num, NULL, 0, NULL, NULL, dh_cb, bio_err);
+ if (dsa == NULL)
+ {
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+
+ dh = DSA_dup_DH(dsa);
+ DSA_free(dsa);
+ if (dh == NULL)
+ {
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+ }
+ else
+#endif
+ {
+ BIO_printf(bio_err,"Generating DH parameters, %d bit long safe prime, generator %d\n",num,g);
+ BIO_printf(bio_err,"This is going to take a long time\n");
+ dh=DH_generate_parameters(num,g,dh_cb,bio_err);
- if (dh == NULL) goto end;
+ if (dh == NULL)
+ {
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+ }
app_RAND_write_file(NULL, bio_err);
} else {
}
}
- if (informat == FORMAT_ASN1)
- dh=d2i_DHparams_bio(in,NULL);
- else if (informat == FORMAT_PEM)
- dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
- else
+ if (informat != FORMAT_ASN1 && informat != FORMAT_PEM)
{
BIO_printf(bio_err,"bad input format specified\n");
goto end;
}
- if (dh == NULL)
+
+#ifndef NO_DSA
+ if (dsaparam)
{
- BIO_printf(bio_err,"unable to load DH parameters\n");
- ERR_print_errors(bio_err);
- goto end;
+ DSA *dsa;
+
+ if (informat == FORMAT_ASN1)
+ dsa=d2i_DSAparams_bio(in,NULL);
+ else /* informat == FORMAT_PEM */
+ dsa=PEM_read_bio_DSAparams(in,NULL,NULL,NULL);
+
+ if (dsa == NULL)
+ {
+ BIO_printf(bio_err,"unable to load DSA parameters\n");
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+
+ dh = DSA_dup_DH(dsa);
+ DSA_free(dsa);
+ if (dh == NULL)
+ {
+ ERR_print_errors(bio_err);
+ goto end;
+ }
}
-
+ else
+#endif
+ {
+ if (informat == FORMAT_ASN1)
+ dh=d2i_DHparams_bio(in,NULL);
+ else /* informat == FORMAT_PEM */
+ dh=PEM_read_bio_DHparams(in,NULL,NULL,NULL);
+
+ if (dh == NULL)
+ {
+ BIO_printf(bio_err,"unable to load DH parameters\n");
+ ERR_print_errors(bio_err);
+ goto end;
+ }
+ }
+
+ /* dh != NULL */
}
-
+
out=BIO_new(BIO_s_file());
if (out == NULL)
{
}
}
-
if (text)
{
}
if (i & DH_CHECK_P_NOT_PRIME)
printf("p value is not prime\n");
- if (i & DH_CHECK_P_NOT_STRONG_PRIME)
- printf("p value is not a strong prime\n");
+ if (i & DH_CHECK_P_NOT_SAFE_PRIME)
+ printf("p value is not a safe prime\n");
if (i & DH_UNABLE_TO_CHECK_GENERATOR)
printf("unable to check the generator value\n");
if (i & DH_NOT_SUITABLE_GENERATOR)
bits,bits);
printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
printf("\t\treturn(NULL);\n");
+ if (dh->length)
+ printf("\tdh->length = %d\n", dh->length);
printf("\treturn(dh);\n\t}\n");
Free(data);
}
EXIT(ret);
}
+/* dh_cb is identical to dsa_cb in apps/dsaparam.c */
static void MS_CALLBACK dh_cb(int p, int n, void *arg)
{
char c='*';
=head1 SYNOPSIS
-B<openssl dh>
+B<openssl dhparam>
[B<-inform DER|PEM>]
[B<-outform DER|PEM>]
-[B<-in filename>]
-[B<-out filename>]
+[B<-in> I<filename>]
+[B<-out> I<filename>]
+[B<-dsaparam>]
[B<-noout>]
[B<-text>]
[B<-C>]
[B<-2>]
[B<-5>]
-[B<-rand file(s)>]
-[numbits]
+[B<-rand> I<file(s)>]
+[I<numbits>]
=head1 DESCRIPTION
This specifies the output format, the options have the same meaning as the
B<-inform> option.
-=item B<-in filename>
+=item B<-in> I<filename>
This specifies the input filename to read parameters from or standard input if
this option is not specified.
-=item B<-out filename>
+=item B<-out> I<filename>
This specifies the output filename parameters to. Standard output is used
if this option is not present. The output filename should B<not> be the same
as the input filename.
+=item B<-dsaparam>
+
+If this option is used, DSA rather than DH parameters are read or created;
+they are converted to DH format. Otherwise, "strong" primes (such
+that (p-1)/2 is also prime) will be used for DH parameter generation.
+
+DH parameter generation with the B<-dsaparam> option is much faster,
+and the recommended exponent length is shorter, which makes DH key
+exchange more efficient. Beware that with such DSA-style DH
+parameters, a fresh DH key should be created for each use to
+avoid small-subgroup attacks that may be possible otherwise.
+
=item B<-2>, B<-5>
The generator to use, either 2 or 5. 2 is the default. If present then the
input file is ignored and parameters are generated instead.
-=item B<-rand file(s)>
+=item B<-rand> I<file(s)>
a file or files containing random data used to seed the random number
generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
The separator is B<;> for MS-Windows, B<,> for OpenVSM, and B<:> for
all others.
-=item B<numbits>
+=item I<numbits>
this option specifies that a parameter set should be generated of size
-B<numbits>. It must be the last option. If not present then a value of 512
+I<numbits>. It must be the last option. If not present then a value of 512
is used. If this option is present then the input file is ignored and
parameters are generated instead.
=item B<-C>
this option converts the parameters into C code. The parameters can then
-be loaded by calling the B<get_dhXXX()> function.
+be loaded by calling the B<get_dh>I<numbits>B<()> function.
=back
L<dsaparam(1)|dsaparam(1)>
+=head1 HISTORY
+
+The B<dhparam> command was added in OpenSSL 0.9.5.
+The B<-dsaparam> option was added in OpenSSL 0.9.6.
+
=cut
projects / openssl.git / commitdiff