a_bitstr.c revision 55714
155714Skris/* crypto/asn1/a_bitstr.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include <openssl/asn1.h> 6255714Skris 6355714Skrisint i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 6455714Skris { 6555714Skris int ret,j,r,bits,len; 6655714Skris unsigned char *p,*d; 6755714Skris 6855714Skris if (a == NULL) return(0); 6955714Skris 7055714Skris len=a->length; 7155714Skris 7255714Skris if (len > 0) 7355714Skris { 7455714Skris if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) 7555714Skris { 7655714Skris bits=(int)a->flags&0x07; 7755714Skris } 7855714Skris else 7955714Skris { 8055714Skris for ( ; len > 0; len--) 8155714Skris { 8255714Skris if (a->data[len-1]) break; 8355714Skris } 8455714Skris j=a->data[len-1]; 8555714Skris if (j & 0x01) bits=0; 8655714Skris else if (j & 0x02) bits=1; 8755714Skris else if (j & 0x04) bits=2; 8855714Skris else if (j & 0x08) bits=3; 8955714Skris else if (j & 0x10) bits=4; 9055714Skris else if (j & 0x20) bits=5; 9155714Skris else if (j & 0x40) bits=6; 9255714Skris else if (j & 0x80) bits=7; 9355714Skris else bits=0; /* should not happen */ 9455714Skris } 9555714Skris } 9655714Skris else 9755714Skris bits=0; 9855714Skris ret=1+len; 9955714Skris r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING); 10055714Skris if (pp == NULL) return(r); 10155714Skris p= *pp; 10255714Skris 10355714Skris ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL); 10455714Skris *(p++)=(unsigned char)bits; 10555714Skris d=a->data; 10655714Skris memcpy(p,d,len); 10755714Skris p+=len; 10855714Skris if (len > 0) p[-1]&=(0xff<<bits); 10955714Skris *pp=p; 11055714Skris return(r); 11155714Skris } 11255714Skris 11355714SkrisASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp, 11455714Skris long length) 11555714Skris { 11655714Skris ASN1_BIT_STRING *ret=NULL; 11755714Skris unsigned char *p,*s; 11855714Skris long len; 11955714Skris int inf,tag,xclass; 12055714Skris int i; 12155714Skris 12255714Skris if ((a == NULL) || ((*a) == NULL)) 12355714Skris { 12455714Skris if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL); 12555714Skris } 12655714Skris else 12755714Skris ret=(*a); 12855714Skris 12955714Skris p= *pp; 13055714Skris inf=ASN1_get_object(&p,&len,&tag,&xclass,length); 13155714Skris if (inf & 0x80) 13255714Skris { 13355714Skris i=ASN1_R_BAD_OBJECT_HEADER; 13455714Skris goto err; 13555714Skris } 13655714Skris 13755714Skris if (tag != V_ASN1_BIT_STRING) 13855714Skris { 13955714Skris i=ASN1_R_EXPECTING_A_BIT_STRING; 14055714Skris goto err; 14155714Skris } 14255714Skris if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; } 14355714Skris 14455714Skris i= *(p++); 14555714Skris /* We do this to preserve the settings. If we modify 14655714Skris * the settings, via the _set_bit function, we will recalculate 14755714Skris * on output */ 14855714Skris ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ 14955714Skris ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ 15055714Skris 15155714Skris if (len-- > 1) /* using one because of the bits left byte */ 15255714Skris { 15355714Skris s=(unsigned char *)Malloc((int)len); 15455714Skris if (s == NULL) 15555714Skris { 15655714Skris i=ERR_R_MALLOC_FAILURE; 15755714Skris goto err; 15855714Skris } 15955714Skris memcpy(s,p,(int)len); 16055714Skris s[len-1]&=(0xff<<i); 16155714Skris p+=len; 16255714Skris } 16355714Skris else 16455714Skris s=NULL; 16555714Skris 16655714Skris ret->length=(int)len; 16755714Skris if (ret->data != NULL) Free((char *)ret->data); 16855714Skris ret->data=s; 16955714Skris ret->type=V_ASN1_BIT_STRING; 17055714Skris if (a != NULL) (*a)=ret; 17155714Skris *pp=p; 17255714Skris return(ret); 17355714Skriserr: 17455714Skris ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); 17555714Skris if ((ret != NULL) && ((a == NULL) || (*a != ret))) 17655714Skris ASN1_BIT_STRING_free(ret); 17755714Skris return(NULL); 17855714Skris } 17955714Skris 18055714Skris/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 18155714Skris */ 18255714Skrisint ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 18355714Skris { 18455714Skris int w,v,iv; 18555714Skris unsigned char *c; 18655714Skris 18755714Skris w=n/8; 18855714Skris v=1<<(7-(n&0x07)); 18955714Skris iv= ~v; 19055714Skris 19155714Skris a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ 19255714Skris 19355714Skris if (a == NULL) return(0); 19455714Skris if ((a->length < (w+1)) || (a->data == NULL)) 19555714Skris { 19655714Skris if (!value) return(1); /* Don't need to set */ 19755714Skris if (a->data == NULL) 19855714Skris c=(unsigned char *)Malloc(w+1); 19955714Skris else 20055714Skris c=(unsigned char *)Realloc(a->data,w+1); 20155714Skris if (c == NULL) return(0); 20255714Skris a->data=c; 20355714Skris a->length=w+1; 20455714Skris c[w]=0; 20555714Skris } 20655714Skris a->data[w]=((a->data[w])&iv)|v; 20755714Skris while ((a->length > 0) && (a->data[a->length-1] == 0)) 20855714Skris a->length--; 20955714Skris return(1); 21055714Skris } 21155714Skris 21255714Skrisint ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 21355714Skris { 21455714Skris int w,v; 21555714Skris 21655714Skris w=n/8; 21755714Skris v=1<<(7-(n&0x07)); 21855714Skris if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) 21955714Skris return(0); 22055714Skris return((a->data[w]&v) != 0); 22155714Skris } 22255714Skris 223