/* crypto/asn1/asn1_lib.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 <limits.h>

#include "cryptlib.h"

#include <openssl/asn1.h>

#include <openssl/asn1_mac.h>

static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);

static void asn1_put_length(unsigned char **pp, int length);

const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;

static int _asn1_check_infinite_end(const unsigned char **p, long len)

	{

	/* If there is 0 or 1 byte left, the length check should pick

	 * things up */

	if (len <= 0)

		return(1);

	else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))

		{

		(*p)+=2;

		return(1);

		}

	return(0);

	}

EXPORT_C int ASN1_check_infinite_end(unsigned char **p, long len)

	{

	return _asn1_check_infinite_end((const unsigned char **)p, len);

	}

EXPORT_C int ASN1_const_check_infinite_end(const unsigned char **p, long len)

	{

	return _asn1_check_infinite_end(p, len);

	}

EXPORT_C int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,

	int *pclass, long omax)

	{

	int i,ret;

	long l;

	const unsigned char *p= *pp;

	int tag,xclass,inf;

	long max=omax;

	if (!max) goto err;

	ret=(*p&V_ASN1_CONSTRUCTED);

	xclass=(*p&V_ASN1_PRIVATE);

	i= *p&V_ASN1_PRIMITIVE_TAG;

	if (i == V_ASN1_PRIMITIVE_TAG)

		{		/* high-tag */

		p++;

		if (--max == 0) goto err;

		l=0;

		while (*p&0x80)

			{

			l<<=7L;

			l|= *(p++)&0x7f;

			if (--max == 0) goto err;

			if (l > (INT_MAX >> 7L)) goto err;

			}

		l<<=7L;

		l|= *(p++)&0x7f;

		tag=(int)l;

		if (--max == 0) goto err;

		}

	else

		{ 

		tag=i;

		p++;

		if (--max == 0) goto err;

		}

	*ptag=tag;

	*pclass=xclass;

	if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;

#if 0

	fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n", 

		(int)p,*plength,omax,(int)*pp,(int)(p+ *plength),

		(int)(omax+ *pp));

#endif

	if (*plength > (omax - (p - *pp)))

		{

		ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);

		/* Set this so that even if things are not long enough

		 * the values are set correctly */

		ret|=0x80;

		}

	*pp=p;

	return(ret|inf);

err:

	ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);

	return(0x80);

	}

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)

	{

	const unsigned char *p= *pp;

	unsigned long ret=0;

	unsigned int i;

	if (max-- < 1) return(0);

	if (*p == 0x80)

		{

		*inf=1;

		ret=0;

		p++;

		}

	else

		{

		*inf=0;

		i= *p&0x7f;

		if (*(p++) & 0x80)

			{

			if (i > sizeof(long))

				return 0;

			if (max-- == 0) return(0);

			while (i-- > 0)

				{

				ret<<=8L;

				ret|= *(p++);

				if (max-- == 0) return(0);

				}

			}

		else

			ret=i;

		}

	if (ret > LONG_MAX)

		return 0;

	*pp=p;

	*rl=(long)ret;

	return(1);

	}

/* class 0 is constructed

 * constructed == 2 for indefinite length constructed */

EXPORT_C void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,

	     int xclass)

	{

	unsigned char *p= *pp;

	int i, ttag;

	i=(constructed)?V_ASN1_CONSTRUCTED:0;

	i|=(xclass&V_ASN1_PRIVATE);

	if (tag < 31)

		*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);

	else

		{

		*(p++)=i|V_ASN1_PRIMITIVE_TAG;

		for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;

		ttag = i;

		while(i-- > 0)

			{

			p[i] = tag & 0x7f;

			if(i != (ttag - 1)) p[i] |= 0x80;

			tag >>= 7;

			}

		p += ttag;

		}

	if (constructed == 2)

		*(p++)=0x80;

	else

		asn1_put_length(&p,length);

	*pp=p;

	}

EXPORT_C int ASN1_put_eoc(unsigned char **pp)

	{

	unsigned char *p = *pp;

	*p++ = 0;

	*p++ = 0;

	*pp = p;

	return 2;

	}

static void asn1_put_length(unsigned char **pp, int length)

	{

	unsigned char *p= *pp;

	int i,l;

	if (length <= 127)

		*(p++)=(unsigned char)length;

	else

		{

		l=length;

		for (i=0; l > 0; i++)

			l>>=8;

		*(p++)=i|0x80;

		l=i;

		while (i-- > 0)

			{

			p[i]=length&0xff;

			length>>=8;

			}

		p+=l;

		}

	*pp=p;

	}

EXPORT_C int ASN1_object_size(int constructed, int length, int tag)

	{

	int ret;

	ret=length;

	ret++;

	if (tag >= 31)

		{

		while (tag > 0)

			{

			tag>>=7;

			ret++;

			}

		}

	if (constructed == 2)

		return ret + 3;

	ret++;

	if (length > 127)

		{

		while (length > 0)

			{

			length>>=8;

			ret++;

			}

		}

	return(ret);

	}

static int _asn1_Finish(ASN1_const_CTX *c)

	{

	if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))

		{

		if (!ASN1_const_check_infinite_end(&c->p,c->slen))

			{

			c->error=ERR_R_MISSING_ASN1_EOS;

			return(0);

			}

		}

	if (	((c->slen != 0) && !(c->inf & 1)) ||

		((c->slen < 0) && (c->inf & 1)))

		{

		c->error=ERR_R_ASN1_LENGTH_MISMATCH;

		return(0);

		}

	return(1);

	}

EXPORT_C int asn1_Finish(ASN1_CTX *c)

	{

	return _asn1_Finish((ASN1_const_CTX *)c);

	}

EXPORT_C int asn1_const_Finish(ASN1_const_CTX *c)

	{

	return _asn1_Finish(c);

	}

EXPORT_C int asn1_GetSequence(ASN1_const_CTX *c, long *length)

	{

	const unsigned char *q;

	q=c->p;

	c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),

		*length);

	if (c->inf & 0x80)

		{

		c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;

		return(0);

		}

	if (c->tag != V_ASN1_SEQUENCE)

		{

		c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;

		return(0);

		}

	(*length)-=(c->p-q);

	if (c->max && (*length < 0))

		{

		c->error=ERR_R_ASN1_LENGTH_MISMATCH;

		return(0);

		}

	if (c->inf == (1|V_ASN1_CONSTRUCTED))

		c->slen= *length+ *(c->pp)-c->p;

	c->eos=0;

	return(1);

	}

EXPORT_C ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)

	{

	ASN1_STRING *ret;

	if (str == NULL) return(NULL);

	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)

		return(NULL);

	if (!ASN1_STRING_set(ret,str->data,str->length))

		{

		ASN1_STRING_free(ret);

		return(NULL);

		}

	ret->flags = str->flags;

	return(ret);

	}

EXPORT_C int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)

	{

	unsigned char *c;

	const char *data=_data;

	if (len < 0)

		{

		if (data == NULL)

			return(0);

		else

			len=strlen(data);

		}

	if ((str->length < len) || (str->data == NULL))

		{

		c=str->data;

		if (c == NULL)

			str->data=OPENSSL_malloc(len+1);

		else

			str->data=OPENSSL_realloc(c,len+1);

		if (str->data == NULL)

			{

			ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);

			str->data=c;

			return(0);

			}

		}

	str->length=len;

	if (data != NULL)

		{

		memcpy(str->data,data,len);

		/* an allowance for strings :-) */

		str->data[len]='\0';

		}

	return(1);

	}

EXPORT_C ASN1_STRING *ASN1_STRING_new(void)

	{

	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));

	}

EXPORT_C ASN1_STRING *ASN1_STRING_type_new(int type)

	{

	ASN1_STRING *ret;

	ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));

	if (ret == NULL)

		{

		ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);

		return(NULL);

		}

	ret->length=0;

	ret->type=type;

	ret->data=NULL;

	ret->flags=0;

	return(ret);

	}

EXPORT_C void ASN1_STRING_free(ASN1_STRING *a)

	{

	if (a == NULL) return;

	if (a->data != NULL) OPENSSL_free(a->data);

	OPENSSL_free(a);

	}

EXPORT_C int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)

	{

	int i;

	i=(a->length-b->length);

	if (i == 0)

		{

		i=memcmp(a->data,b->data,a->length);

		if (i == 0)

			return(a->type-b->type);

		else

			return(i);

		}

	else

		return(i);

	}

EXPORT_C void asn1_add_error(const unsigned char *address, int offset)

	{

	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];

	BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);

	BIO_snprintf(buf2,sizeof buf2,"%d",offset);

	ERR_add_error_data(4,"address=",buf1," offset=",buf2);

	}

EXPORT_C int ASN1_STRING_length(ASN1_STRING *x)

{ return M_ASN1_STRING_length(x); }

EXPORT_C void ASN1_STRING_length_set(ASN1_STRING *x, int len)

{ M_ASN1_STRING_length_set(x, len); return; }

EXPORT_C int ASN1_STRING_type(ASN1_STRING *x)

{ return M_ASN1_STRING_type(x); }

EXPORT_C unsigned char * ASN1_STRING_data(ASN1_STRING *x)

{ return M_ASN1_STRING_data(x); }