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/* crypto/asn1/i2d_dhp.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#ifndef NO_DH
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/asn1_mac.h>
#include <openssl/dh.h>
int i2d_DHparams(DH *a, unsigned char **pp)
{
BIGNUM *num[3];
ASN1_INTEGER bs;
unsigned int j,i,tot=0,len,max=0;
int t,ret= -1;
unsigned char *p;
if (a == NULL) return(0);
num[0]=a->p;
num[1]=a->g;
if (a->length != 0)
{
if ((num[2]=BN_new()) == NULL) goto err;
if (!BN_set_word(num[2],a->length)) goto err;
}
else
num[2]=NULL;
for (i=0; i<3; i++)
{
if (num[i] == NULL) continue;
j=BN_num_bits(num[i]);
len=((j == 0)?0:((j/8)+1));
if (len > max) max=len;
len=ASN1_object_size(0,len,
(num[i]->neg)?V_ASN1_NEG_INTEGER:V_ASN1_INTEGER);
tot+=len;
}
t=ASN1_object_size(1,tot,V_ASN1_SEQUENCE);
if (pp == NULL)
{
if (num[2] != NULL)
BN_free(num[2]);
return(t);
}
p= *pp;
ASN1_put_object(&p,1,tot,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
bs.type=V_ASN1_INTEGER;
bs.data=(unsigned char *)Malloc(max+4);
if (bs.data == NULL)
{
ASN1err(ASN1_F_I2D_DHPARAMS,ERR_R_MALLOC_FAILURE);
goto err;
}
for (i=0; i<3; i++)
{
if (num[i] == NULL) continue;
bs.length=BN_bn2bin(num[i],bs.data);
i2d_ASN1_INTEGER(&bs,&p);
}
Free(bs.data);
ret=t;
err:
if (num[2] != NULL) BN_free(num[2]);
*pp=p;
return(ret);
}
#endif
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