249 lines
7.1 KiB
C
249 lines
7.1 KiB
C
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/* crypto/asn1/a_bitstr.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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int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
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{ return M_ASN1_BIT_STRING_set(x, d, len); }
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int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
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{
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int ret,j,bits,len;
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unsigned char *p,*d;
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if (a == NULL) return(0);
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len=a->length;
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if (len > 0)
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{
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if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
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{
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bits=(int)a->flags&0x07;
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}
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else
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{
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for ( ; len > 0; len--)
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{
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if (a->data[len-1]) break;
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}
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j=a->data[len-1];
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if (j & 0x01) bits=0;
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else if (j & 0x02) bits=1;
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else if (j & 0x04) bits=2;
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else if (j & 0x08) bits=3;
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else if (j & 0x10) bits=4;
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else if (j & 0x20) bits=5;
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else if (j & 0x40) bits=6;
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else if (j & 0x80) bits=7;
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else bits=0; /* should not happen */
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}
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}
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else
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bits=0;
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ret=1+len;
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if (pp == NULL) return(ret);
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p= *pp;
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*(p++)=(unsigned char)bits;
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d=a->data;
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memcpy(p,d,len);
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p+=len;
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if (len > 0) p[-1]&=(0xff<<bits);
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*pp=p;
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return(ret);
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}
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ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
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const unsigned char **pp, long len)
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{
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ASN1_BIT_STRING *ret=NULL;
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const unsigned char *p;
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unsigned char *s;
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int i;
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if (len < 1)
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{
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i=ASN1_R_STRING_TOO_SHORT;
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goto err;
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}
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if ((a == NULL) || ((*a) == NULL))
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{
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if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
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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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i= *(p++);
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/* We do this to preserve the settings. If we modify
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* the settings, via the _set_bit function, we will recalculate
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* on output */
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ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
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ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
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if (len-- > 1) /* using one because of the bits left byte */
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{
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s=(unsigned char *)OPENSSL_malloc((int)len);
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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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memcpy(s,p,(int)len);
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s[len-1]&=(0xff<<i);
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p+=len;
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}
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else
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s=NULL;
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ret->length=(int)len;
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if (ret->data != NULL) OPENSSL_free(ret->data);
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ret->data=s;
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ret->type=V_ASN1_BIT_STRING;
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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_C2I_ASN1_BIT_STRING,i);
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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M_ASN1_BIT_STRING_free(ret);
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return(NULL);
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}
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/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
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*/
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int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
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{
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int w,v,iv;
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unsigned char *c;
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w=n/8;
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v=1<<(7-(n&0x07));
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iv= ~v;
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if (!value) v=0;
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if (a == NULL)
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return 0;
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a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
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if ((a->length < (w+1)) || (a->data == NULL))
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{
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if (!value) return(1); /* Don't need to set */
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if (a->data == NULL)
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c=(unsigned char *)OPENSSL_malloc(w+1);
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else
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c=(unsigned char *)OPENSSL_realloc_clean(a->data,
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a->length,
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w+1);
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if (c == NULL)
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{
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ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE);
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return 0;
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}
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if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length);
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a->data=c;
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a->length=w+1;
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}
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a->data[w]=((a->data[w])&iv)|v;
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while ((a->length > 0) && (a->data[a->length-1] == 0))
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a->length--;
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return(1);
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}
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int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
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{
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int w,v;
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w=n/8;
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v=1<<(7-(n&0x07));
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if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
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return(0);
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return((a->data[w]&v) != 0);
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}
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/*
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* Checks if the given bit string contains only bits specified by
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* the flags vector. Returns 0 if there is at least one bit set in 'a'
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* which is not specified in 'flags', 1 otherwise.
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* 'len' is the length of 'flags'.
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*/
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int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
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unsigned char *flags, int flags_len)
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{
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int i, ok;
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/* Check if there is one bit set at all. */
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if (!a || !a->data) return 1;
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/* Check each byte of the internal representation of the bit string. */
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ok = 1;
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for (i = 0; i < a->length && ok; ++i)
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{
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unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
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/* We are done if there is an unneeded bit set. */
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ok = (a->data[i] & mask) == 0;
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}
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return ok;
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}
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