crypto/asn1/a_bitstr.c - third_party/openssl - Git at Google

 /* crypto/asn1/a_bitstr.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
  *    "This product includes cryptographic software written by
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
  * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */

 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/asn1.h>

 int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
 	{
 	int ret,j,r,bits,len;
 	unsigned char *p,*d;

 	if (a == NULL) return(0);

 	len=a->length;

 	if (len > 0)
 		{
 		if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
 			{
 			bits=(int)a->flags&0x07;
 			}
 		else
 			{
 			for ( ; len > 0; len--)
 				{
 				if (a->data[len-1]) break;
 				}
 			j=a->data[len-1];
 			if      (j & 0x01) bits=0;
 			else if (j & 0x02) bits=1;
 			else if (j & 0x04) bits=2;
 			else if (j & 0x08) bits=3;
 			else if (j & 0x10) bits=4;
 			else if (j & 0x20) bits=5;
 			else if (j & 0x40) bits=6;
 			else if (j & 0x80) bits=7;
 			else bits=0; /* should not happen */
 			}
 		}
 	else
 		bits=0;
 	ret=1+len;
 	r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
 	if (pp == NULL) return(r);
 	p= *pp;

 	ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
 	*(p++)=(unsigned char)bits;
 	d=a->data;
 	memcpy(p,d,len);
 	p+=len;
 	if (len > 0) p[-1]&=(0xff<<bits);
 	*pp=p;
 	return(r);
 	}

 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
 	     long length)
 	{
 	ASN1_BIT_STRING *ret=NULL;
 	unsigned char *p,*s;
 	long len;
 	int inf,tag,xclass;
 	int i;

 	if ((a == NULL) || ((*a) == NULL))
 		{
 		if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
 		}
 	else
 		ret=(*a);

 	p= *pp;
 	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 	if (inf & 0x80)
 		{
 		i=ASN1_R_BAD_OBJECT_HEADER;
 		goto err;
 		}

 	if (tag != V_ASN1_BIT_STRING)
 		{
 		i=ASN1_R_EXPECTING_A_BIT_STRING;
 		goto err;
 		}
 	if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }

 	i= *(p++);
 	/* We do this to preserve the settings.  If we modify
 	 * the settings, via the _set_bit function, we will recalculate
 	 * on output */
 	ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
 	ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */

 	if (len-- > 1) /* using one because of the bits left byte */
 		{
 		s=(unsigned char *)Malloc((int)len);
 		if (s == NULL)
 			{
 			i=ERR_R_MALLOC_FAILURE;
 			goto err;
 			}
 		memcpy(s,p,(int)len);
 		s[len-1]&=(0xff<<i);
 		p+=len;
 		}
 	else
 		s=NULL;

 	ret->length=(int)len;
 	if (ret->data != NULL) Free((char *)ret->data);
 	ret->data=s;
 	ret->type=V_ASN1_BIT_STRING;
 	if (a != NULL) (*a)=ret;
 	*pp=p;
 	return(ret);
 err:
 	ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 		ASN1_BIT_STRING_free(ret);
 	return(NULL);
 	}

 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
  */
 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
 	{
 	int w,v,iv;
 	unsigned char *c;

 	w=n/8;
 	v=1<<(7-(n&0x07));
 	iv= ~v;

 	a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */

 	if (a == NULL) return(0);
 	if ((a->length < (w+1)) || (a->data == NULL))
 		{
 		if (!value) return(1); /* Don't need to set */
 		if (a->data == NULL)
 			c=(unsigned char *)Malloc(w+1);
 		else
 			c=(unsigned char *)Realloc(a->data,w+1);
 		if (c == NULL) return(0);
 		a->data=c;
 		a->length=w+1;
 		c[w]=0;
 		}
 	a->data[w]=((a->data[w])&iv)|v;
 	while ((a->length > 0) && (a->data[a->length-1] == 0))
 		a->length--;
 	return(1);
 	}

 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
 	{
 	int w,v;

 	w=n/8;
 	v=1<<(7-(n&0x07));
 	if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
 		return(0);
 	return((a->data[w]&v) != 0);
 	}
	/* crypto/asn1/a_bitstr.c */
	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	* All rights reserved.
	*
	* This package is an SSL implementation written
	* by Eric Young (eay@cryptsoft.com).
	* The implementation was written so as to conform with Netscapes SSL.
	*
	* This library is free for commercial and non-commercial use as long as
	* the following conditions are aheared to. The following conditions
	* apply to all code found in this distribution, be it the RC4, RSA,
	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	* included with this distribution is covered by the same copyright terms
	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	*
	* Copyright remains Eric Young's, and as such any Copyright notices in
	* the code are not to be removed.
	* If this package is used in a product, Eric Young should be given attribution
	* as the author of the parts of the library used.
	* This can be in the form of a textual message at program startup or
	* in documentation (online or textual) provided with the package.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. All advertising materials mentioning features or use of this software
	* must display the following acknowledgement:
	* "This product includes cryptographic software written by
	* Eric Young (eay@cryptsoft.com)"
	* The word 'cryptographic' can be left out if the rouines from the library
	* being used are not cryptographic related :-).
	* 4. If you include any Windows specific code (or a derivative thereof) from
	* the apps directory (application code) you must include an acknowledgement:
	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	*
	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* The licence and distribution terms for any publically available version or
	* derivative of this code cannot be changed. i.e. this code cannot simply be
	* copied and put under another distribution licence
	* [including the GNU Public Licence.]
	*/

	#include <stdio.h>
	#include "cryptlib.h"
	#include <openssl/asn1.h>

	int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING a, unsigned char *pp)
	{
	int ret,j,r,bits,len;
	unsigned char p,d;

	if (a == NULL) return(0);

	len=a->length;

	if (len > 0)
	{
	if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
	{
	bits=(int)a->flags&0x07;
	}
	else
	{
	for ( ; len > 0; len--)
	{
	if (a->data[len-1]) break;
	}
	j=a->data[len-1];
	if (j & 0x01) bits=0;
	else if (j & 0x02) bits=1;
	else if (j & 0x04) bits=2;
	else if (j & 0x08) bits=3;
	else if (j & 0x10) bits=4;
	else if (j & 0x20) bits=5;
	else if (j & 0x40) bits=6;
	else if (j & 0x80) bits=7;
	else bits=0; /* should not happen */
	}
	}
	else
	bits=0;
	ret=1+len;
	r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
	if (pp == NULL) return(r);
	p= *pp;

	ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
	*(p++)=(unsigned char)bits;
	d=a->data;
	memcpy(p,d,len);
	p+=len;
	if (len > 0) p[-1]&=(0xff<<bits);
	*pp=p;
	return(r);
	}

	ASN1_BIT_STRING d2i_ASN1_BIT_STRING(ASN1_BIT_STRING a, unsigned char *pp,
	long length)
	{
	ASN1_BIT_STRING *ret=NULL;
	unsigned char p,s;
	long len;
	int inf,tag,xclass;
	int i;

	if ((a == NULL) \|\| ((*a) == NULL))
	{
	if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
	}
	else
	ret=(*a);

	p= *pp;
	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
	if (inf & 0x80)
	{
	i=ASN1_R_BAD_OBJECT_HEADER;
	goto err;
	}

	if (tag != V_ASN1_BIT_STRING)
	{
	i=ASN1_R_EXPECTING_A_BIT_STRING;
	goto err;
	}
	if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }

	i= *(p++);
	/* We do this to preserve the settings. If we modify
	* the settings, via the _set_bit function, we will recalculate
	* on output */
	ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT\|0x07); /* clear */
	ret->flags\|=(ASN1_STRING_FLAG_BITS_LEFT\|(i&0x07)); /* set */

	if (len-- > 1) /* using one because of the bits left byte */
	{
	s=(unsigned char *)Malloc((int)len);
	if (s == NULL)
	{
	i=ERR_R_MALLOC_FAILURE;
	goto err;
	}
	memcpy(s,p,(int)len);
	s[len-1]&=(0xff<<i);
	p+=len;
	}
	else
	s=NULL;

	ret->length=(int)len;
	if (ret->data != NULL) Free((char *)ret->data);
	ret->data=s;
	ret->type=V_ASN1_BIT_STRING;
	if (a != NULL) (*a)=ret;
	*pp=p;
	return(ret);
	err:
	ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
	if ((ret != NULL) && ((a == NULL) \|\| (*a != ret)))
	ASN1_BIT_STRING_free(ret);
	return(NULL);
	}

	/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
	*/
	int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
	{
	int w,v,iv;
	unsigned char *c;

	w=n/8;
	v=1<<(7-(n&0x07));
	iv= ~v;

	a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT\|0x07); /* clear, set on write */

	if (a == NULL) return(0);
	if ((a->length < (w+1)) \|\| (a->data == NULL))
	{
	if (!value) return(1); /* Don't need to set */
	if (a->data == NULL)
	c=(unsigned char *)Malloc(w+1);
	else
	c=(unsigned char *)Realloc(a->data,w+1);
	if (c == NULL) return(0);
	a->data=c;
	a->length=w+1;
	c[w]=0;
	}
	a->data[w]=((a->data[w])&iv)\|v;
	while ((a->length > 0) && (a->data[a->length-1] == 0))
	a->length--;
	return(1);
	}

	int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
	{
	int w,v;

	w=n/8;
	v=1<<(7-(n&0x07));
	if ((a == NULL) \|\| (a->length < (w+1)) \|\| (a->data == NULL))
	return(0);
	return((a->data[w]&v) != 0);
	}