294 lines
7.2 KiB
C
294 lines
7.2 KiB
C
/* crypto/asn1/a_int.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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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1.h>
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/* ASN1err(ASN1_F_D2I_ASN1_INTEGER,ASN1_R_EXPECTING_AN_INTEGER);
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*/
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int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
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{
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int pad=0,ret,r,i,t;
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unsigned char *p,*pt,*n,pb=0;
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if ((a == NULL) || (a->data == NULL)) return(0);
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t=a->type;
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if (a->length == 0)
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ret=1;
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else
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{
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ret=a->length;
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i=a->data[0];
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if ((t == V_ASN1_INTEGER) && (i > 127))
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{
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pad=1;
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pb=0;
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}
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else if ((t == V_ASN1_NEG_INTEGER) && (i>128))
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{
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pad=1;
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pb=0xFF;
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}
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ret+=pad;
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}
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r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
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if (pp == NULL) return(r);
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p= *pp;
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ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
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if (pad) *(p++)=pb;
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if (a->length == 0)
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*(p++)=0;
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else if (t == V_ASN1_INTEGER)
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{
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memcpy(p,a->data,(unsigned int)a->length);
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p+=a->length;
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}
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else
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{
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n=a->data;
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pt=p;
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for (i=a->length; i>0; i--)
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*(p++)= (*(n++)^0xFF)+1;
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if (!pad) *pt|=0x80;
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}
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*pp=p;
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return(r);
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}
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ASN1_INTEGER *d2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
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long length)
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{
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ASN1_INTEGER *ret=NULL;
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unsigned char *p,*to,*s;
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long len;
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int inf,tag,xclass;
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int i;
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if ((a == NULL) || ((*a) == NULL))
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{
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if ((ret=ASN1_INTEGER_new()) == NULL) return(NULL);
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ret->type=V_ASN1_INTEGER;
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}
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else
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ret=(*a);
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p= *pp;
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inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
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if (inf & 0x80)
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{
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i=ASN1_R_BAD_OBJECT_HEADER;
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goto err;
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}
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if (tag != V_ASN1_INTEGER)
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{
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i=ASN1_R_EXPECTING_AN_INTEGER;
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goto err;
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}
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/* We must Malloc stuff, even for 0 bytes otherwise it
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* signifies a missing NULL parameter. */
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s=(unsigned char *)Malloc((int)len+1);
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if (s == NULL)
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{
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i=ERR_R_MALLOC_FAILURE;
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goto err;
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}
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to=s;
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if (*p & 0x80) /* a negative number */
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{
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ret->type=V_ASN1_NEG_INTEGER;
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if (*p == 0xff)
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{
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p++;
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len--;
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}
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for (i=(int)len; i>0; i--)
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*(to++)= (*(p++)^0xFF)+1;
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}
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else
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{
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ret->type=V_ASN1_INTEGER;
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if ((*p == 0) && (len != 1))
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{
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p++;
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len--;
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}
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memcpy(s,p,(int)len);
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p+=len;
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}
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if (ret->data != NULL) Free((char *)ret->data);
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ret->data=s;
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ret->length=(int)len;
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if (a != NULL) (*a)=ret;
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*pp=p;
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return(ret);
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err:
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ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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ASN1_INTEGER_free(ret);
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return(NULL);
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}
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int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
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{
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int i,j,k;
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unsigned char buf[sizeof(long)+1];
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long d;
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a->type=V_ASN1_INTEGER;
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if (a->length < (sizeof(long)+1))
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{
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if (a->data != NULL)
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Free((char *)a->data);
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if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
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memset((char *)a->data,0,sizeof(long)+1);
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}
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if (a->data == NULL)
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{
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ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
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return(0);
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}
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d=v;
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if (d < 0)
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{
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d= -d;
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a->type=V_ASN1_NEG_INTEGER;
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}
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for (i=0; i<sizeof(long); i++)
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{
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if (d == 0) break;
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buf[i]=(int)d&0xff;
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d>>=8;
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}
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j=0;
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if (v < 0) a->data[j++]=0;
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for (k=i-1; k >=0; k--)
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a->data[j++]=buf[k];
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a->length=j;
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return(1);
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}
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long ASN1_INTEGER_get(ASN1_INTEGER *a)
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{
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int neg=0,i;
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long r=0;
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if (a == NULL) return(0L);
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i=a->type;
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if (i == V_ASN1_NEG_INTEGER)
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neg=1;
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else if (i != V_ASN1_INTEGER)
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return(0);
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if (a->length > sizeof(long))
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{
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/* hmm... a bit ugly */
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return(0xffffffffL);
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}
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if (a->data == NULL)
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return(0);
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for (i=0; i<a->length; i++)
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{
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r<<=8;
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r|=(unsigned char)a->data[i];
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}
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if (neg) r= -r;
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return(r);
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}
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ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
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{
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ASN1_INTEGER *ret;
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int len,j;
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if (ai == NULL)
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ret=ASN1_INTEGER_new();
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else
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ret=ai;
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if (ret == NULL)
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{
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ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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ret->type=V_ASN1_INTEGER;
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j=BN_num_bits(bn);
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len=((j == 0)?0:((j/8)+1));
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ret->data=(unsigned char *)Malloc(len+4);
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ret->length=BN_bn2bin(bn,ret->data);
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return(ret);
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err:
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if (ret != ai) ASN1_INTEGER_free(ret);
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return(NULL);
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}
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BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
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{
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BIGNUM *ret;
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if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
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ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
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return(ret);
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}
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