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https://github.com/openssl/openssl.git
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129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/* crypto/asn1/i2d_dhp.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#ifndef NO_DH
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/asn1_mac.h>
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#include <openssl/dh.h>
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int i2d_DHparams(DH *a, unsigned char **pp)
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{
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BIGNUM *num[3];
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ASN1_INTEGER bs;
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unsigned int j,i,tot=0,len,max=0;
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int t,ret= -1;
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unsigned char *p;
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if (a == NULL) return(0);
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num[0]=a->p;
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num[1]=a->g;
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if (a->length != 0)
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{
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if ((num[2]=BN_new()) == NULL) goto err;
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if (!BN_set_word(num[2],a->length)) goto err;
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}
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else
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num[2]=NULL;
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for (i=0; i<3; i++)
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{
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if (num[i] == NULL) continue;
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j=BN_num_bits(num[i]);
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len=((j == 0)?0:((j/8)+1));
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if (len > max) max=len;
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len=ASN1_object_size(0,len,
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(num[i]->neg)?V_ASN1_NEG_INTEGER:V_ASN1_INTEGER);
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tot+=len;
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}
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t=ASN1_object_size(1,tot,V_ASN1_SEQUENCE);
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if (pp == NULL)
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{
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if (num[2] != NULL)
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BN_free(num[2]);
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return(t);
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}
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p= *pp;
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ASN1_put_object(&p,1,tot,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
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bs.type=V_ASN1_INTEGER;
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bs.data=(unsigned char *)Malloc(max+4);
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if (bs.data == NULL)
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{
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ASN1err(ASN1_F_I2D_DHPARAMS,ERR_R_MALLOC_FAILURE);
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goto err;
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}
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for (i=0; i<3; i++)
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{
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if (num[i] == NULL) continue;
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bs.length=BN_bn2bin(num[i],bs.data);
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i2d_ASN1_INTEGER(&bs,&p);
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}
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Free((char *)bs.data);
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ret=t;
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err:
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if (num[2] != NULL) BN_free(num[2]);
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*pp=p;
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return(ret);
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}
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#endif
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