Click here to Skip to main content
Click here to Skip to main content
Add your own
alternative version

SMTP Client with SSL/TLS

, , 17 Aug 2013 CPOL
C++ SMTP client, support SSL and TLS encrypted connection to SMTP server
CSmtp_v1_9_ssl.zip
CSmtp_v1_9_ssl
openssl-0.9.8l
inc32
openssl
out32
libeay32.lib
ssleay32.lib
CSmtp_v2_0_ssl.zip
CSmtp_v2_0_ssl
openssl-0.9.8l
inc32
openssl
out32
libeay32.lib
ssleay32.lib
CSmtp_v2_1_ssl.zip
CSmtp_v2_1_ssl
openssl-0.9.8l
inc32
openssl
out32
libeay32.lib
ssleay32.lib
CSmtp_v2_2_ssl.zip
CSmtp_v2_2_ssl
openssl-0.9.8l
inc32
openssl
out32
libeay32.lib
ssleay32.lib
CSmtp_v2_3_ssl.zip
CSmtp_v2_3_ssl
openssl-0.9.8l
inc32
openssl
out32
libeay32.lib
ssleay32.lib
/* asn1t.h */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
#ifndef HEADER_ASN1T_H
#define HEADER_ASN1T_H

#include <stddef.h>
#include <openssl/e_os2.h>
#include <openssl/asn1.h>

#ifdef OPENSSL_BUILD_SHLIBCRYPTO
# undef OPENSSL_EXTERN
# define OPENSSL_EXTERN OPENSSL_EXPORT
#endif

/* ASN1 template defines, structures and functions */

#ifdef  __cplusplus
extern "C" {
#endif


#ifndef OPENSSL_EXPORT_VAR_AS_FUNCTION

/* Macro to obtain ASN1_ADB pointer from a type (only used internally) */
#define ASN1_ADB_ptr(iptr) ((const ASN1_ADB *)(iptr))


/* Macros for start and end of ASN1_ITEM definition */

#define ASN1_ITEM_start(itname) \
	OPENSSL_GLOBAL const ASN1_ITEM itname##_it = {

#define ASN1_ITEM_end(itname) \
		};

#else

/* Macro to obtain ASN1_ADB pointer from a type (only used internally) */
#define ASN1_ADB_ptr(iptr) ((const ASN1_ADB *)(iptr()))


/* Macros for start and end of ASN1_ITEM definition */

#define ASN1_ITEM_start(itname) \
	const ASN1_ITEM * itname##_it(void) \
	{ \
		static const ASN1_ITEM local_it = { 

#define ASN1_ITEM_end(itname) \
		}; \
	return &local_it; \
	}

#endif


/* Macros to aid ASN1 template writing */

#define ASN1_ITEM_TEMPLATE(tname) \
	static const ASN1_TEMPLATE tname##_item_tt 

#define ASN1_ITEM_TEMPLATE_END(tname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_PRIMITIVE,\
		-1,\
		&tname##_item_tt,\
		0,\
		NULL,\
		0,\
		#tname \
	ASN1_ITEM_end(tname)


/* This is a ASN1 type which just embeds a template */
 
/* This pair helps declare a SEQUENCE. We can do:
 *
 * 	ASN1_SEQUENCE(stname) = {
 * 		... SEQUENCE components ...
 * 	} ASN1_SEQUENCE_END(stname)
 *
 * 	This will produce an ASN1_ITEM called stname_it
 *	for a structure called stname.
 *
 * 	If you want the same structure but a different
 *	name then use:
 *
 * 	ASN1_SEQUENCE(itname) = {
 * 		... SEQUENCE components ...
 * 	} ASN1_SEQUENCE_END_name(stname, itname)
 *
 *	This will create an item called itname_it using
 *	a structure called stname.
 */

#define ASN1_SEQUENCE(tname) \
	static const ASN1_TEMPLATE tname##_seq_tt[] 

#define ASN1_SEQUENCE_END(stname) ASN1_SEQUENCE_END_name(stname, stname)

#define ASN1_SEQUENCE_END_name(stname, tname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_SEQUENCE,\
		V_ASN1_SEQUENCE,\
		tname##_seq_tt,\
		sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
		NULL,\
		sizeof(stname),\
		#stname \
	ASN1_ITEM_end(tname)

#define ASN1_NDEF_SEQUENCE(tname) \
	ASN1_SEQUENCE(tname)

#define ASN1_NDEF_SEQUENCE_cb(tname, cb) \
	ASN1_SEQUENCE_cb(tname, cb)

#define ASN1_SEQUENCE_cb(tname, cb) \
	static const ASN1_AUX tname##_aux = {NULL, 0, 0, 0, cb, 0}; \
	ASN1_SEQUENCE(tname)

#define ASN1_BROKEN_SEQUENCE(tname) \
	static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_BROKEN, 0, 0, 0, 0}; \
	ASN1_SEQUENCE(tname)

#define ASN1_SEQUENCE_ref(tname, cb, lck) \
	static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_REFCOUNT, offsetof(tname, references), lck, cb, 0}; \
	ASN1_SEQUENCE(tname)

#define ASN1_SEQUENCE_enc(tname, enc, cb) \
	static const ASN1_AUX tname##_aux = {NULL, ASN1_AFLG_ENCODING, 0, 0, cb, offsetof(tname, enc)}; \
	ASN1_SEQUENCE(tname)

#define ASN1_NDEF_SEQUENCE_END(tname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_NDEF_SEQUENCE,\
		V_ASN1_SEQUENCE,\
		tname##_seq_tt,\
		sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
		NULL,\
		sizeof(tname),\
		#tname \
	ASN1_ITEM_end(tname)

#define ASN1_BROKEN_SEQUENCE_END(stname) ASN1_SEQUENCE_END_ref(stname, stname)

#define ASN1_SEQUENCE_END_enc(stname, tname) ASN1_SEQUENCE_END_ref(stname, tname)

#define ASN1_SEQUENCE_END_cb(stname, tname) ASN1_SEQUENCE_END_ref(stname, tname)

#define ASN1_SEQUENCE_END_ref(stname, tname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_SEQUENCE,\
		V_ASN1_SEQUENCE,\
		tname##_seq_tt,\
		sizeof(tname##_seq_tt) / sizeof(ASN1_TEMPLATE),\
		&tname##_aux,\
		sizeof(stname),\
		#stname \
	ASN1_ITEM_end(tname)


/* This pair helps declare a CHOICE type. We can do:
 *
 * 	ASN1_CHOICE(chname) = {
 * 		... CHOICE options ...
 * 	ASN1_CHOICE_END(chname)
 *
 * 	This will produce an ASN1_ITEM called chname_it
 *	for a structure called chname. The structure
 *	definition must look like this:
 *	typedef struct {
 *		int type;
 *		union {
 *			ASN1_SOMETHING *opt1;
 *			ASN1_SOMEOTHER *opt2;
 *		} value;
 *	} chname;
 *	
 *	the name of the selector must be 'type'.
 * 	to use an alternative selector name use the
 *      ASN1_CHOICE_END_selector() version.
 */

#define ASN1_CHOICE(tname) \
	static const ASN1_TEMPLATE tname##_ch_tt[] 

#define ASN1_CHOICE_cb(tname, cb) \
	static const ASN1_AUX tname##_aux = {NULL, 0, 0, 0, cb, 0}; \
	ASN1_CHOICE(tname)

#define ASN1_CHOICE_END(stname) ASN1_CHOICE_END_name(stname, stname)

#define ASN1_CHOICE_END_name(stname, tname) ASN1_CHOICE_END_selector(stname, tname, type)

#define ASN1_CHOICE_END_selector(stname, tname, selname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_CHOICE,\
		offsetof(stname,selname) ,\
		tname##_ch_tt,\
		sizeof(tname##_ch_tt) / sizeof(ASN1_TEMPLATE),\
		NULL,\
		sizeof(stname),\
		#stname \
	ASN1_ITEM_end(tname)

#define ASN1_CHOICE_END_cb(stname, tname, selname) \
	;\
	ASN1_ITEM_start(tname) \
		ASN1_ITYPE_CHOICE,\
		offsetof(stname,selname) ,\
		tname##_ch_tt,\
		sizeof(tname##_ch_tt) / sizeof(ASN1_TEMPLATE),\
		&tname##_aux,\
		sizeof(stname),\
		#stname \
	ASN1_ITEM_end(tname)

/* This helps with the template wrapper form of ASN1_ITEM */

#define ASN1_EX_TEMPLATE_TYPE(flags, tag, name, type) { \
	(flags), (tag), 0,\
	#name, ASN1_ITEM_ref(type) }

/* These help with SEQUENCE or CHOICE components */

/* used to declare other types */

#define ASN1_EX_TYPE(flags, tag, stname, field, type) { \
	(flags), (tag), offsetof(stname, field),\
	#field, ASN1_ITEM_ref(type) }

/* used when the structure is combined with the parent */

#define ASN1_EX_COMBINE(flags, tag, type) { \
	(flags)|ASN1_TFLG_COMBINE, (tag), 0, NULL, ASN1_ITEM_ref(type) }

/* implicit and explicit helper macros */

#define ASN1_IMP_EX(stname, field, type, tag, ex) \
		ASN1_EX_TYPE(ASN1_TFLG_IMPLICIT | ex, tag, stname, field, type)

#define ASN1_EXP_EX(stname, field, type, tag, ex) \
		ASN1_EX_TYPE(ASN1_TFLG_EXPLICIT | ex, tag, stname, field, type)

/* Any defined by macros: the field used is in the table itself */

#ifndef OPENSSL_EXPORT_VAR_AS_FUNCTION
#define ASN1_ADB_OBJECT(tblname) { ASN1_TFLG_ADB_OID, -1, 0, #tblname, (const ASN1_ITEM *)&(tblname##_adb) }
#define ASN1_ADB_INTEGER(tblname) { ASN1_TFLG_ADB_INT, -1, 0, #tblname, (const ASN1_ITEM *)&(tblname##_adb) }
#else
#define ASN1_ADB_OBJECT(tblname) { ASN1_TFLG_ADB_OID, -1, 0, #tblname, tblname##_adb }
#define ASN1_ADB_INTEGER(tblname) { ASN1_TFLG_ADB_INT, -1, 0, #tblname, tblname##_adb }
#endif
/* Plain simple type */
#define ASN1_SIMPLE(stname, field, type) ASN1_EX_TYPE(0,0, stname, field, type)

/* OPTIONAL simple type */
#define ASN1_OPT(stname, field, type) ASN1_EX_TYPE(ASN1_TFLG_OPTIONAL, 0, stname, field, type)

/* IMPLICIT tagged simple type */
#define ASN1_IMP(stname, field, type, tag) ASN1_IMP_EX(stname, field, type, tag, 0)

/* IMPLICIT tagged OPTIONAL simple type */
#define ASN1_IMP_OPT(stname, field, type, tag) ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL)

/* Same as above but EXPLICIT */

#define ASN1_EXP(stname, field, type, tag) ASN1_EXP_EX(stname, field, type, tag, 0)
#define ASN1_EXP_OPT(stname, field, type, tag) ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL)

/* SEQUENCE OF type */
#define ASN1_SEQUENCE_OF(stname, field, type) \
		ASN1_EX_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, stname, field, type)

/* OPTIONAL SEQUENCE OF */
#define ASN1_SEQUENCE_OF_OPT(stname, field, type) \
		ASN1_EX_TYPE(ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL, 0, stname, field, type)

/* Same as above but for SET OF */

#define ASN1_SET_OF(stname, field, type) \
		ASN1_EX_TYPE(ASN1_TFLG_SET_OF, 0, stname, field, type)

#define ASN1_SET_OF_OPT(stname, field, type) \
		ASN1_EX_TYPE(ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL, 0, stname, field, type)

/* Finally compound types of SEQUENCE, SET, IMPLICIT, EXPLICIT and OPTIONAL */

#define ASN1_IMP_SET_OF(stname, field, type, tag) \
			ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF)

#define ASN1_EXP_SET_OF(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF)

#define ASN1_IMP_SET_OF_OPT(stname, field, type, tag) \
			ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL)

#define ASN1_EXP_SET_OF_OPT(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SET_OF|ASN1_TFLG_OPTIONAL)

#define ASN1_IMP_SEQUENCE_OF(stname, field, type, tag) \
			ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF)

#define ASN1_IMP_SEQUENCE_OF_OPT(stname, field, type, tag) \
			ASN1_IMP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL)

#define ASN1_EXP_SEQUENCE_OF(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF)

#define ASN1_EXP_SEQUENCE_OF_OPT(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_SEQUENCE_OF|ASN1_TFLG_OPTIONAL)

/* EXPLICIT using indefinite length constructed form */
#define ASN1_NDEF_EXP(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_NDEF)

/* EXPLICIT OPTIONAL using indefinite length constructed form */
#define ASN1_NDEF_EXP_OPT(stname, field, type, tag) \
			ASN1_EXP_EX(stname, field, type, tag, ASN1_TFLG_OPTIONAL|ASN1_TFLG_NDEF)

/* Macros for the ASN1_ADB structure */

#define ASN1_ADB(name) \
	static const ASN1_ADB_TABLE name##_adbtbl[] 

#ifndef OPENSSL_EXPORT_VAR_AS_FUNCTION

#define ASN1_ADB_END(name, flags, field, app_table, def, none) \
	;\
	static const ASN1_ADB name##_adb = {\
		flags,\
		offsetof(name, field),\
		app_table,\
		name##_adbtbl,\
		sizeof(name##_adbtbl) / sizeof(ASN1_ADB_TABLE),\
		def,\
		none\
	}

#else

#define ASN1_ADB_END(name, flags, field, app_table, def, none) \
	;\
	static const ASN1_ITEM *name##_adb(void) \
	{ \
	static const ASN1_ADB internal_adb = \
		{\
		flags,\
		offsetof(name, field),\
		app_table,\
		name##_adbtbl,\
		sizeof(name##_adbtbl) / sizeof(ASN1_ADB_TABLE),\
		def,\
		none\
		}; \
		return (const ASN1_ITEM *) &internal_adb; \
	} \
	void dummy_function(void)

#endif

#define ADB_ENTRY(val, template) {val, template}

#define ASN1_ADB_TEMPLATE(name) \
	static const ASN1_TEMPLATE name##_tt 

/* This is the ASN1 template structure that defines
 * a wrapper round the actual type. It determines the
 * actual position of the field in the value structure,
 * various flags such as OPTIONAL and the field name.
 */

struct ASN1_TEMPLATE_st {
unsigned long flags;		/* Various flags */
long tag;			/* tag, not used if no tagging */
unsigned long offset;		/* Offset of this field in structure */
#ifndef NO_ASN1_FIELD_NAMES
const char *field_name;		/* Field name */
#endif
ASN1_ITEM_EXP *item;		/* Relevant ASN1_ITEM or ASN1_ADB */
};

/* Macro to extract ASN1_ITEM and ASN1_ADB pointer from ASN1_TEMPLATE */

#define ASN1_TEMPLATE_item(t) (t->item_ptr)
#define ASN1_TEMPLATE_adb(t) (t->item_ptr)

typedef struct ASN1_ADB_TABLE_st ASN1_ADB_TABLE;
typedef struct ASN1_ADB_st ASN1_ADB;

struct ASN1_ADB_st {
	unsigned long flags;	/* Various flags */
	unsigned long offset;	/* Offset of selector field */
	STACK_OF(ASN1_ADB_TABLE) **app_items; /* Application defined items */
	const ASN1_ADB_TABLE *tbl;	/* Table of possible types */
	long tblcount;		/* Number of entries in tbl */
	const ASN1_TEMPLATE *default_tt;  /* Type to use if no match */
	const ASN1_TEMPLATE *null_tt;  /* Type to use if selector is NULL */
};

struct ASN1_ADB_TABLE_st {
	long value;		/* NID for an object or value for an int */
	const ASN1_TEMPLATE tt;		/* item for this value */
};

/* template flags */

/* Field is optional */
#define ASN1_TFLG_OPTIONAL	(0x1)

/* Field is a SET OF */
#define ASN1_TFLG_SET_OF	(0x1 << 1)

/* Field is a SEQUENCE OF */
#define ASN1_TFLG_SEQUENCE_OF	(0x2 << 1)

/* Special case: this refers to a SET OF that
 * will be sorted into DER order when encoded *and*
 * the corresponding STACK will be modified to match
 * the new order.
 */
#define ASN1_TFLG_SET_ORDER	(0x3 << 1)

/* Mask for SET OF or SEQUENCE OF */
#define ASN1_TFLG_SK_MASK	(0x3 << 1)

/* These flags mean the tag should be taken from the
 * tag field. If EXPLICIT then the underlying type
 * is used for the inner tag.
 */

/* IMPLICIT tagging */
#define ASN1_TFLG_IMPTAG	(0x1 << 3)


/* EXPLICIT tagging, inner tag from underlying type */
#define ASN1_TFLG_EXPTAG	(0x2 << 3)

#define ASN1_TFLG_TAG_MASK	(0x3 << 3)

/* context specific IMPLICIT */
#define ASN1_TFLG_IMPLICIT	ASN1_TFLG_IMPTAG|ASN1_TFLG_CONTEXT

/* context specific EXPLICIT */
#define ASN1_TFLG_EXPLICIT	ASN1_TFLG_EXPTAG|ASN1_TFLG_CONTEXT

/* If tagging is in force these determine the
 * type of tag to use. Otherwise the tag is
 * determined by the underlying type. These 
 * values reflect the actual octet format.
 */

/* Universal tag */ 
#define ASN1_TFLG_UNIVERSAL	(0x0<<6)
/* Application tag */ 
#define ASN1_TFLG_APPLICATION	(0x1<<6)
/* Context specific tag */ 
#define ASN1_TFLG_CONTEXT	(0x2<<6)
/* Private tag */ 
#define ASN1_TFLG_PRIVATE	(0x3<<6)

#define ASN1_TFLG_TAG_CLASS	(0x3<<6)

/* These are for ANY DEFINED BY type. In this case
 * the 'item' field points to an ASN1_ADB structure
 * which contains a table of values to decode the
 * relevant type
 */

#define ASN1_TFLG_ADB_MASK	(0x3<<8)

#define ASN1_TFLG_ADB_OID	(0x1<<8)

#define ASN1_TFLG_ADB_INT	(0x1<<9)

/* This flag means a parent structure is passed
 * instead of the field: this is useful is a
 * SEQUENCE is being combined with a CHOICE for
 * example. Since this means the structure and
 * item name will differ we need to use the
 * ASN1_CHOICE_END_name() macro for example.
 */

#define ASN1_TFLG_COMBINE	(0x1<<10)

/* This flag when present in a SEQUENCE OF, SET OF
 * or EXPLICIT causes indefinite length constructed
 * encoding to be used if required.
 */

#define ASN1_TFLG_NDEF		(0x1<<11)

/* This is the actual ASN1 item itself */

struct ASN1_ITEM_st {
char itype;			/* The item type, primitive, SEQUENCE, CHOICE or extern */
long utype;			/* underlying type */
const ASN1_TEMPLATE *templates;	/* If SEQUENCE or CHOICE this contains the contents */
long tcount;			/* Number of templates if SEQUENCE or CHOICE */
const void *funcs;		/* functions that handle this type */
long size;			/* Structure size (usually)*/
#ifndef NO_ASN1_FIELD_NAMES
const char *sname;		/* Structure name */
#endif
};

/* These are values for the itype field and
 * determine how the type is interpreted.
 *
 * For PRIMITIVE types the underlying type
 * determines the behaviour if items is NULL.
 *
 * Otherwise templates must contain a single 
 * template and the type is treated in the
 * same way as the type specified in the template.
 *
 * For SEQUENCE types the templates field points
 * to the members, the size field is the
 * structure size.
 *
 * For CHOICE types the templates field points
 * to each possible member (typically a union)
 * and the 'size' field is the offset of the
 * selector.
 *
 * The 'funcs' field is used for application
 * specific functions. 
 *
 * For COMPAT types the funcs field gives a
 * set of functions that handle this type, this
 * supports the old d2i, i2d convention.
 *
 * The EXTERN type uses a new style d2i/i2d.
 * The new style should be used where possible
 * because it avoids things like the d2i IMPLICIT
 * hack.
 *
 * MSTRING is a multiple string type, it is used
 * for a CHOICE of character strings where the
 * actual strings all occupy an ASN1_STRING
 * structure. In this case the 'utype' field
 * has a special meaning, it is used as a mask
 * of acceptable types using the B_ASN1 constants.
 *
 * NDEF_SEQUENCE is the same as SEQUENCE except
 * that it will use indefinite length constructed
 * encoding if requested.
 *
 */

#define ASN1_ITYPE_PRIMITIVE		0x0

#define ASN1_ITYPE_SEQUENCE		0x1

#define ASN1_ITYPE_CHOICE		0x2

#define ASN1_ITYPE_COMPAT		0x3

#define ASN1_ITYPE_EXTERN		0x4

#define ASN1_ITYPE_MSTRING		0x5

#define ASN1_ITYPE_NDEF_SEQUENCE	0x6

/* Cache for ASN1 tag and length, so we
 * don't keep re-reading it for things
 * like CHOICE
 */

struct ASN1_TLC_st{
	char valid;	/* Values below are valid */
	int ret;	/* return value */
	long plen;	/* length */
	int ptag;	/* class value */
	int pclass;	/* class value */
	int hdrlen;	/* header length */
};

/* Typedefs for ASN1 function pointers */

typedef ASN1_VALUE * ASN1_new_func(void);
typedef void ASN1_free_func(ASN1_VALUE *a);
typedef ASN1_VALUE * ASN1_d2i_func(ASN1_VALUE **a, const unsigned char ** in, long length);
typedef int ASN1_i2d_func(ASN1_VALUE * a, unsigned char **in);

typedef int ASN1_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it,
					int tag, int aclass, char opt, ASN1_TLC *ctx);

typedef int ASN1_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
typedef int ASN1_ex_new_func(ASN1_VALUE **pval, const ASN1_ITEM *it);
typedef void ASN1_ex_free_func(ASN1_VALUE **pval, const ASN1_ITEM *it);

typedef int ASN1_primitive_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
typedef int ASN1_primitive_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);

typedef struct ASN1_COMPAT_FUNCS_st {
	ASN1_new_func *asn1_new;
	ASN1_free_func *asn1_free;
	ASN1_d2i_func *asn1_d2i;
	ASN1_i2d_func *asn1_i2d;
} ASN1_COMPAT_FUNCS;

typedef struct ASN1_EXTERN_FUNCS_st {
	void *app_data;
	ASN1_ex_new_func *asn1_ex_new;
	ASN1_ex_free_func *asn1_ex_free;
	ASN1_ex_free_func *asn1_ex_clear;
	ASN1_ex_d2i *asn1_ex_d2i;
	ASN1_ex_i2d *asn1_ex_i2d;
} ASN1_EXTERN_FUNCS;

typedef struct ASN1_PRIMITIVE_FUNCS_st {
	void *app_data;
	unsigned long flags;
	ASN1_ex_new_func *prim_new;
	ASN1_ex_free_func *prim_free;
	ASN1_ex_free_func *prim_clear;
	ASN1_primitive_c2i *prim_c2i;
	ASN1_primitive_i2c *prim_i2c;
} ASN1_PRIMITIVE_FUNCS;

/* This is the ASN1_AUX structure: it handles various
 * miscellaneous requirements. For example the use of
 * reference counts and an informational callback.
 *
 * The "informational callback" is called at various
 * points during the ASN1 encoding and decoding. It can
 * be used to provide minor customisation of the structures
 * used. This is most useful where the supplied routines
 * *almost* do the right thing but need some extra help
 * at a few points. If the callback returns zero then
 * it is assumed a fatal error has occurred and the 
 * main operation should be abandoned.
 *
 * If major changes in the default behaviour are required
 * then an external type is more appropriate.
 */

typedef int ASN1_aux_cb(int operation, ASN1_VALUE **in, const ASN1_ITEM *it);

typedef struct ASN1_AUX_st {
	void *app_data;
	int flags;
	int ref_offset;		/* Offset of reference value */
	int ref_lock;		/* Lock type to use */
	ASN1_aux_cb *asn1_cb;
	int enc_offset;		/* Offset of ASN1_ENCODING structure */
} ASN1_AUX;

/* Flags in ASN1_AUX */

/* Use a reference count */
#define ASN1_AFLG_REFCOUNT	1
/* Save the encoding of structure (useful for signatures) */
#define ASN1_AFLG_ENCODING	2
/* The Sequence length is invalid */
#define ASN1_AFLG_BROKEN	4

/* operation values for asn1_cb */

#define ASN1_OP_NEW_PRE		0
#define ASN1_OP_NEW_POST	1
#define ASN1_OP_FREE_PRE	2
#define ASN1_OP_FREE_POST	3
#define ASN1_OP_D2I_PRE		4
#define ASN1_OP_D2I_POST	5
#define ASN1_OP_I2D_PRE		6
#define ASN1_OP_I2D_POST	7

/* Macro to implement a primitive type */
#define IMPLEMENT_ASN1_TYPE(stname) IMPLEMENT_ASN1_TYPE_ex(stname, stname, 0)
#define IMPLEMENT_ASN1_TYPE_ex(itname, vname, ex) \
				ASN1_ITEM_start(itname) \
					ASN1_ITYPE_PRIMITIVE, V_##vname, NULL, 0, NULL, ex, #itname \
				ASN1_ITEM_end(itname)

/* Macro to implement a multi string type */
#define IMPLEMENT_ASN1_MSTRING(itname, mask) \
				ASN1_ITEM_start(itname) \
					ASN1_ITYPE_MSTRING, mask, NULL, 0, NULL, sizeof(ASN1_STRING), #itname \
				ASN1_ITEM_end(itname)

/* Macro to implement an ASN1_ITEM in terms of old style funcs */

#define IMPLEMENT_COMPAT_ASN1(sname) IMPLEMENT_COMPAT_ASN1_type(sname, V_ASN1_SEQUENCE)

#define IMPLEMENT_COMPAT_ASN1_type(sname, tag) \
	static const ASN1_COMPAT_FUNCS sname##_ff = { \
		(ASN1_new_func *)sname##_new, \
		(ASN1_free_func *)sname##_free, \
		(ASN1_d2i_func *)d2i_##sname, \
		(ASN1_i2d_func *)i2d_##sname, \
	}; \
	ASN1_ITEM_start(sname) \
		ASN1_ITYPE_COMPAT, \
		tag, \
		NULL, \
		0, \
		&sname##_ff, \
		0, \
		#sname \
	ASN1_ITEM_end(sname)

#define IMPLEMENT_EXTERN_ASN1(sname, tag, fptrs) \
	ASN1_ITEM_start(sname) \
		ASN1_ITYPE_EXTERN, \
		tag, \
		NULL, \
		0, \
		&fptrs, \
		0, \
		#sname \
	ASN1_ITEM_end(sname)

/* Macro to implement standard functions in terms of ASN1_ITEM structures */

#define IMPLEMENT_ASN1_FUNCTIONS(stname) IMPLEMENT_ASN1_FUNCTIONS_fname(stname, stname, stname)

#define IMPLEMENT_ASN1_FUNCTIONS_name(stname, itname) IMPLEMENT_ASN1_FUNCTIONS_fname(stname, itname, itname)

#define IMPLEMENT_ASN1_FUNCTIONS_ENCODE_name(stname, itname) \
			IMPLEMENT_ASN1_FUNCTIONS_ENCODE_fname(stname, itname, itname)

#define IMPLEMENT_ASN1_ALLOC_FUNCTIONS(stname) \
		IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, stname, stname)

#define IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname) \
	stname *fname##_new(void) \
	{ \
		return (stname *)ASN1_item_new(ASN1_ITEM_rptr(itname)); \
	} \
	void fname##_free(stname *a) \
	{ \
		ASN1_item_free((ASN1_VALUE *)a, ASN1_ITEM_rptr(itname)); \
	}

#define IMPLEMENT_ASN1_FUNCTIONS_fname(stname, itname, fname) \
	IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(stname, itname, fname) \
	IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname)

#define IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(stname, itname, fname) \
	stname *d2i_##fname(stname **a, const unsigned char **in, long len) \
	{ \
		return (stname *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, ASN1_ITEM_rptr(itname));\
	} \
	int i2d_##fname(stname *a, unsigned char **out) \
	{ \
		return ASN1_item_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(itname));\
	} 

#define IMPLEMENT_ASN1_NDEF_FUNCTION(stname) \
	int i2d_##stname##_NDEF(stname *a, unsigned char **out) \
	{ \
		return ASN1_item_ndef_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(stname));\
	} 

/* This includes evil casts to remove const: they will go away when full
 * ASN1 constification is done.
 */
#define IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(stname, itname, fname) \
	stname *d2i_##fname(stname **a, const unsigned char **in, long len) \
	{ \
		return (stname *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, ASN1_ITEM_rptr(itname));\
	} \
	int i2d_##fname(const stname *a, unsigned char **out) \
	{ \
		return ASN1_item_i2d((ASN1_VALUE *)a, out, ASN1_ITEM_rptr(itname));\
	} 

#define IMPLEMENT_ASN1_DUP_FUNCTION(stname) \
	stname * stname##_dup(stname *x) \
        { \
        return ASN1_item_dup(ASN1_ITEM_rptr(stname), x); \
        }

#define IMPLEMENT_ASN1_FUNCTIONS_const(name) \
		IMPLEMENT_ASN1_FUNCTIONS_const_fname(name, name, name)

#define IMPLEMENT_ASN1_FUNCTIONS_const_fname(stname, itname, fname) \
	IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(stname, itname, fname) \
	IMPLEMENT_ASN1_ALLOC_FUNCTIONS_fname(stname, itname, fname)

/* external definitions for primitive types */

DECLARE_ASN1_ITEM(ASN1_BOOLEAN)
DECLARE_ASN1_ITEM(ASN1_TBOOLEAN)
DECLARE_ASN1_ITEM(ASN1_FBOOLEAN)
DECLARE_ASN1_ITEM(ASN1_SEQUENCE)
DECLARE_ASN1_ITEM(CBIGNUM)
DECLARE_ASN1_ITEM(BIGNUM)
DECLARE_ASN1_ITEM(LONG)
DECLARE_ASN1_ITEM(ZLONG)

DECLARE_STACK_OF(ASN1_VALUE)

/* Functions used internally by the ASN1 code */

int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it);

void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
int ASN1_template_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_TEMPLATE *tt);
int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, const ASN1_ITEM *it,
				int tag, int aclass, char opt, ASN1_TLC *ctx);

int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass);
int ASN1_template_i2d(ASN1_VALUE **pval, unsigned char **out, const ASN1_TEMPLATE *tt);
void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it);

int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);

int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it);
int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it);

ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);

const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr);

int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it);

void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it);
void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, const ASN1_ITEM *it);
int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, const ASN1_ITEM *it);

#ifdef  __cplusplus
}
#endif
#endif

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Authors

David Johns
Web Developer
United States United States
No Biography provided

John_Tang
Software Developer
China China
No Biography provided

| Advertise | Privacy | Mobile
Web02 | 2.8.141015.1 | Last Updated 17 Aug 2013
Article Copyright 2010 by David Johns, John_Tang
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid