a_bytes.c

开源的ssl算法openssl,版本0.9.8H

/* crypto/asn1/a_bytes.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * 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 ([e-mail]).
 * 
 * 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 ([e-mail])"
 *    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 ([e-mail])"
 * 
 * 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>

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
/* type is a 'bitmap' of acceptable string types.
 */
ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
	     long length, int type)
	{
	ASN1_STRING *ret=NULL;
	const unsigned char *p;
	unsigned char *s;
	long len;
	int inf,tag,xclass;
	int i=0;

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

	if (tag >= 32)
		{
		i=ASN1_R_TAG_VALUE_TOO_HIGH;;
		goto err;
		}
	if (!(ASN1_tag2bit(tag) & type))
		{
		i=ASN1_R_WRONG_TYPE;
		goto err;
		}

	/* If a bit-string, exit early */
	if (tag == V_ASN1_BIT_STRING)
		return(d2i_ASN1_BIT_STRING(a,pp,length));

	if ((a == NULL) || ((*a) == NULL))
		{
		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
		}
	else
		ret=(*a);

	if (len != 0)
		{
		s=(unsigned char *)OPENSSL_malloc((int)len+1);
		if (s == NULL)
			{
			i=ERR_R_MALLOC_FAILURE;
			goto err;
			}
		memcpy(s,p,(int)len);
		s[len]='\0';
		p+=len;
		}
	else
		s=NULL;

	if (ret->data != NULL) OPENSSL_free(ret->data);
	ret->length=(int)len;
	ret->data=s;
	ret->type=tag;
	if (a != NULL) (*a)=ret;
	*pp=p;
	return(ret);
err:
	ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
		ASN1_STRING_free(ret);
	return(NULL);
	}

int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
	{
	int ret,r,constructed;
	unsigned char *p;

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

	if (tag == V_ASN1_BIT_STRING)
		return(i2d_ASN1_BIT_STRING(a,pp));
		
	ret=a->length;
	r=ASN1_object_size(0,ret,tag);
	if (pp == NULL) return(r);
	p= *pp;

	if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
		constructed=1;
	else
		constructed=0;
	ASN1_put_object(&p,constructed,ret,tag,xclass);
	memcpy(p,a->data,a->length);
	p+=a->length;
	*pp= p;
	return(r);
	}

ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
	     long length, int Ptag, int Pclass)
	{
	ASN1_STRING *ret=NULL;
	const unsigned char *p;
	unsigned char *s;
	long len;
	int inf,tag,xclass;
	int i=0;

	if ((a == NULL) || ((*a) == NULL))
		{
		if ((ret=ASN1_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 != Ptag)
		{
		i=ASN1_R_WRONG_TAG;
		goto err;
		}

	if (inf & V_ASN1_CONSTRUCTED)
		{
		ASN1_const_CTX c;

		c.pp=pp;
		c.p=p;
		c.inf=inf;
		c.slen=len;
		c.tag=Ptag;
		c.xclass=Pclass;
		c.max=(length == 0)?0:(p+length);
		if (!asn1_collate_primitive(ret,&c)) 
			goto err; 
		else
			{
			p=c.p;
			}
		}
	else
		{
		if (len != 0)
			{
			if ((ret->length < len) || (ret->data == NULL))
				{
				if (ret->data != NULL) OPENSSL_free(ret->data);
				s=(unsigned char *)OPENSSL_malloc((int)len + 1);
				if (s == NULL)
					{
					i=ERR_R_MALLOC_FAILURE;
					goto err;
					}
				}
			else
				s=ret->data;
			memcpy(s,p,(int)len);
			s[len] = '\0';
			p+=len;
			}
		else
			{
			s=NULL;
			if (ret->data != NULL) OPENSSL_free(ret->data);
			}

		ret->length=(int)len;
		ret->data=s;
		ret->type=Ptag;
		}

	if (a != NULL) (*a)=ret;
	*pp=p;
	return(ret);
err:
	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
		ASN1_STRING_free(ret);
	ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
	return(NULL);
	}


/* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
 * them into the one structure that is then returned */
/* There have been a few bug fixes for this function from
 * Paul Keogh <[e-mail]>, many thanks to him */
static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
	{
	ASN1_STRING *os=NULL;
	BUF_MEM b;
	int num;

	b.length=0;
	b.max=0;
	b.data=NULL;

	if (a == NULL)
		{
		c->error=ERR_R_PASSED_NULL_PARAMETER;
		goto err;
		}

	num=0;
	for (;;)
		{
		if (c->inf & 1)
			{
			c->eos=ASN1_const_check_infinite_end(&c->p,
				(long)(c->max-c->p));
			if (c->eos) break;
			}
		else
			{
			if (c->slen <= 0) break;
			}

		c->q=c->p;
		if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
			== NULL)
			{
			c->error=ERR_R_ASN1_LIB;
			goto err;
			}

		if (!BUF_MEM_grow_clean(&b,num+os->length))
			{
			c->error=ERR_R_BUF_LIB;
			goto err;
			}
		memcpy(&(b.data[num]),os->data,os->length);
		if (!(c->inf & 1))
			c->slen-=(c->p-c->q);
		num+=os->length;
		}

	if (!asn1_const_Finish(c)) goto err;

	a->length=num;
	if (a->data != NULL) OPENSSL_free(a->data);
	a->data=(unsigned char *)b.data;
	if (os != NULL) ASN1_STRING_free(os);
	return(1);
err:
	ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
	if (os != NULL) ASN1_STRING_free(os);
	if (b.data != NULL) OPENSSL_free(b.data);
	return(0);
	}