openssl/crypto/dh/dh_ameth.c
2006-04-04 18:16:03 +00:00

176 lines
4.7 KiB
C

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 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
* licensing@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).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/dh.h>
#include "asn1_locl.h"
static void int_dh_free(EVP_PKEY *pkey)
{
DH_free(pkey->pkey.dh);
}
static int dh_param_decode(EVP_PKEY *pkey,
const unsigned char **pder, int derlen)
{
DH *dh;
if (!(dh = d2i_DHparams(NULL, pder, derlen)))
{
DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
return 0;
}
EVP_PKEY_assign_DH(pkey, dh);
return 1;
}
static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_DHparams(pkey->pkey.dh, pder);
}
static int do_dhparam_print(BIO *bp, const DH *x, int indent,
ASN1_PCTX *ctx)
{
unsigned char *m=NULL;
int reason=ERR_R_BUF_LIB,ret=0;
size_t buf_len=0, i;
if (x->p)
buf_len = (size_t)BN_num_bytes(x->p);
else
{
reason = ERR_R_PASSED_NULL_PARAMETER;
goto err;
}
if (x->g)
if (buf_len < (i = (size_t)BN_num_bytes(x->g)))
buf_len = i;
m=(unsigned char *)OPENSSL_malloc(buf_len+10);
if (m == NULL)
{
reason=ERR_R_MALLOC_FAILURE;
goto err;
}
BIO_indent(bp, indent, 128);
if (BIO_printf(bp,"Diffie-Hellman-Parameters: (%d bit)\n",
BN_num_bits(x->p)) <= 0)
goto err;
indent += 4;
if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
if (x->length != 0)
{
BIO_indent(bp, indent, 128);
if (BIO_printf(bp,"recommended-private-length: %d bits\n",
(int)x->length) <= 0) goto err;
}
ret=1;
if (0)
{
err:
DHerr(DH_F_DHPARAMS_PRINT,reason);
}
if (m != NULL) OPENSSL_free(m);
return(ret);
}
static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return do_dhparam_print(bp, pkey->pkey.dh, indent, ctx);
}
int DHparams_print(BIO *bp, const DH *x)
{
return do_dhparam_print(bp, x, 4, NULL);
}
const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
{
EVP_PKEY_DH,
EVP_PKEY_DH,
0,
"DH",
"OpenSSL PKCS#3 DH method",
0,
0,
0,
0,
0,
0,
0,
0,
0,
dh_param_decode,
dh_param_encode,
0,0,0,
dh_param_print,
int_dh_free,
0
};