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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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|
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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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|
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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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|
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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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|
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if (a == NULL) return(0); |
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|
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len=a->length; |
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|
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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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|
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ret=1+len; |
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if (pp == NULL) return(ret); |
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|
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p= *pp; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (a == NULL) |
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return 0; |
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|
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a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ |
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|
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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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|
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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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|
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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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|