/* 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); }