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 6359191Skrisint ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) 6459191Skris{ return M_ASN1_BIT_STRING_set(x, d, len); } 6559191Skris 6668651Skrisint i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) 6755714Skris { 6868651Skris int ret,j,bits,len; 6955714Skris unsigned char *p,*d; 7055714Skris 7155714Skris if (a == NULL) return(0); 7255714Skris 7355714Skris len=a->length; 7455714Skris 7555714Skris if (len > 0) 7655714Skris { 7755714Skris if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) 7855714Skris { 7955714Skris bits=(int)a->flags&0x07; 8055714Skris } 8155714Skris else 8255714Skris { 8355714Skris for ( ; len > 0; len--) 8455714Skris { 8555714Skris if (a->data[len-1]) break; 8655714Skris } 8755714Skris j=a->data[len-1]; 8855714Skris if (j & 0x01) bits=0; 8955714Skris else if (j & 0x02) bits=1; 9055714Skris else if (j & 0x04) bits=2; 9155714Skris else if (j & 0x08) bits=3; 9255714Skris else if (j & 0x10) bits=4; 9355714Skris else if (j & 0x20) bits=5; 9455714Skris else if (j & 0x40) bits=6; 9555714Skris else if (j & 0x80) bits=7; 9655714Skris else bits=0; /* should not happen */ 9755714Skris } 9855714Skris } 9955714Skris else 10055714Skris bits=0; 101100936Snectar 102100936Snectar ret=1+len; 103100936Snectar if (pp == NULL) return(ret); 104100936Snectar 10555714Skris p= *pp; 10655714Skris 10755714Skris *(p++)=(unsigned char)bits; 10855714Skris d=a->data; 10955714Skris memcpy(p,d,len); 11055714Skris p+=len; 11155714Skris if (len > 0) p[-1]&=(0xff<<bits); 11255714Skris *pp=p; 11368651Skris return(ret); 11455714Skris } 11555714Skris 116160814SsimonASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, 117160814Ssimon const unsigned char **pp, long len) 11868651Skris { 11968651Skris ASN1_BIT_STRING *ret=NULL; 120160814Ssimon const unsigned char *p; 121160814Ssimon unsigned char *s; 12268651Skris int i; 12368651Skris 124109998Smarkm if (len < 1) 125109998Smarkm { 126109998Smarkm i=ASN1_R_STRING_TOO_SHORT; 127109998Smarkm goto err; 128109998Smarkm } 129109998Smarkm 13068651Skris if ((a == NULL) || ((*a) == NULL)) 13168651Skris { 13268651Skris if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL); 13368651Skris } 13468651Skris else 13568651Skris ret=(*a); 13668651Skris 13768651Skris p= *pp; 13855714Skris i= *(p++); 139277195Sdelphij if (i > 7) 140277195Sdelphij { 141277195Sdelphij i=ASN1_R_INVALID_BIT_STRING_BITS_LEFT; 142277195Sdelphij goto err; 143277195Sdelphij } 14455714Skris /* We do this to preserve the settings. If we modify 14555714Skris * the settings, via the _set_bit function, we will recalculate 14655714Skris * on output */ 14755714Skris ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ 148277195Sdelphij ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|i); /* set */ 14955714Skris 15055714Skris if (len-- > 1) /* using one because of the bits left byte */ 15155714Skris { 15268651Skris s=(unsigned char *)OPENSSL_malloc((int)len); 15355714Skris if (s == NULL) 15455714Skris { 15555714Skris i=ERR_R_MALLOC_FAILURE; 15655714Skris goto err; 15755714Skris } 15855714Skris memcpy(s,p,(int)len); 15955714Skris s[len-1]&=(0xff<<i); 16055714Skris p+=len; 16155714Skris } 16255714Skris else 16355714Skris s=NULL; 16455714Skris 16555714Skris ret->length=(int)len; 16668651Skris if (ret->data != NULL) OPENSSL_free(ret->data); 16755714Skris ret->data=s; 16855714Skris ret->type=V_ASN1_BIT_STRING; 16955714Skris if (a != NULL) (*a)=ret; 17055714Skris *pp=p; 17155714Skris return(ret); 17255714Skriserr: 173160814Ssimon ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i); 17455714Skris if ((ret != NULL) && ((a == NULL) || (*a != ret))) 17559191Skris M_ASN1_BIT_STRING_free(ret); 17655714Skris return(NULL); 17755714Skris } 17855714Skris 17955714Skris/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> 18055714Skris */ 18155714Skrisint ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) 18255714Skris { 18355714Skris int w,v,iv; 18455714Skris unsigned char *c; 18555714Skris 18655714Skris w=n/8; 18755714Skris v=1<<(7-(n&0x07)); 18855714Skris iv= ~v; 189100928Snectar if (!value) v=0; 19055714Skris 191160814Ssimon if (a == NULL) 192160814Ssimon return 0; 193160814Ssimon 19455714Skris a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ 19555714Skris 19655714Skris if ((a->length < (w+1)) || (a->data == NULL)) 19755714Skris { 19855714Skris if (!value) return(1); /* Don't need to set */ 19955714Skris if (a->data == NULL) 20068651Skris c=(unsigned char *)OPENSSL_malloc(w+1); 20155714Skris else 202109998Smarkm c=(unsigned char *)OPENSSL_realloc_clean(a->data, 203109998Smarkm a->length, 204109998Smarkm w+1); 205160814Ssimon if (c == NULL) 206160814Ssimon { 207160814Ssimon ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE); 208160814Ssimon return 0; 209160814Ssimon } 210160814Ssimon if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length); 21155714Skris a->data=c; 21255714Skris a->length=w+1; 21368651Skris } 21455714Skris a->data[w]=((a->data[w])&iv)|v; 21555714Skris while ((a->length > 0) && (a->data[a->length-1] == 0)) 21655714Skris a->length--; 21755714Skris return(1); 21855714Skris } 21955714Skris 22055714Skrisint ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) 22155714Skris { 22255714Skris int w,v; 22355714Skris 22455714Skris w=n/8; 22555714Skris v=1<<(7-(n&0x07)); 22655714Skris if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) 22755714Skris return(0); 22855714Skris return((a->data[w]&v) != 0); 22955714Skris } 23055714Skris 231238405Sjkim/* 232238405Sjkim * Checks if the given bit string contains only bits specified by 233238405Sjkim * the flags vector. Returns 0 if there is at least one bit set in 'a' 234238405Sjkim * which is not specified in 'flags', 1 otherwise. 235238405Sjkim * 'len' is the length of 'flags'. 236238405Sjkim */ 237238405Sjkimint ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, 238238405Sjkim unsigned char *flags, int flags_len) 239238405Sjkim { 240238405Sjkim int i, ok; 241238405Sjkim /* Check if there is one bit set at all. */ 242238405Sjkim if (!a || !a->data) return 1; 243238405Sjkim 244238405Sjkim /* Check each byte of the internal representation of the bit string. */ 245238405Sjkim ok = 1; 246238405Sjkim for (i = 0; i < a->length && ok; ++i) 247238405Sjkim { 248238405Sjkim unsigned char mask = i < flags_len ? ~flags[i] : 0xff; 249238405Sjkim /* We are done if there is an unneeded bit set. */ 250238405Sjkim ok = (a->data[i] & mask) == 0; 251238405Sjkim } 252238405Sjkim return ok; 253238405Sjkim } 254