/* v3_utl.c */

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

 * project.

 */

/* ====================================================================

 * Copyright (c) 1999-2003 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).

 *

 */

 /*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

/* X509 v3 extension utilities */

#include <stdio.h>

#include <ctype.h>

#include "cryptlib.h"

#include <openssl/conf.h>

#include <openssl/x509v3.h>

#include <openssl/bn.h>

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

static char *strip_spaces(char *name);

static int sk_strcmp(const char * const *a, const char * const *b);

static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens);

static void str_free(void *str);

static int append_ia5(STACK **sk, ASN1_IA5STRING *email);

static int ipv4_from_asc(unsigned char *v4, const char *in);

static int ipv6_from_asc(unsigned char *v6, const char *in);

static int ipv6_cb(const char *elem, int len, void *usr);

static int ipv6_hex(unsigned char *out, const char *in, int inlen);

/* Add a CONF_VALUE name value pair to stack */

EXPORT_C int X509V3_add_value(const char *name, const char *value,

						STACK_OF(CONF_VALUE) **extlist)

{

	CONF_VALUE *vtmp = NULL;

	char *tname = NULL, *tvalue = NULL;

	if(name && !(tname = BUF_strdup(name))) goto err;

	if(value && !(tvalue = BUF_strdup(value))) goto err;;

	if(!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE)))) goto err;

	if(!*extlist && !(*extlist = sk_CONF_VALUE_new_null())) goto err;

	vtmp->section = NULL;

	vtmp->name = tname;

	vtmp->value = tvalue;

	if(!sk_CONF_VALUE_push(*extlist, vtmp)) goto err;

	return 1;

	err:

	X509V3err(X509V3_F_X509V3_ADD_VALUE,ERR_R_MALLOC_FAILURE);

	if(vtmp) OPENSSL_free(vtmp);

	if(tname) OPENSSL_free(tname);

	if(tvalue) OPENSSL_free(tvalue);

	return 0;

}

EXPORT_C int X509V3_add_value_uchar(const char *name, const unsigned char *value,

			   STACK_OF(CONF_VALUE) **extlist)

    {

    return X509V3_add_value(name,(const char *)value,extlist);

    }

/* Free function for STACK_OF(CONF_VALUE) */

EXPORT_C void X509V3_conf_free(CONF_VALUE *conf)

{

	if(!conf) return;

	if(conf->name) OPENSSL_free(conf->name);

	if(conf->value) OPENSSL_free(conf->value);

	if(conf->section) OPENSSL_free(conf->section);

	OPENSSL_free(conf);

}

EXPORT_C int X509V3_add_value_bool(const char *name, int asn1_bool,

						STACK_OF(CONF_VALUE) **extlist)

{

	if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);

	return X509V3_add_value(name, "FALSE", extlist);

}

EXPORT_C int X509V3_add_value_bool_nf(char *name, int asn1_bool,

						STACK_OF(CONF_VALUE) **extlist)

{

	if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);

	return 1;

}

EXPORT_C char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)

{

	BIGNUM *bntmp = NULL;

	char *strtmp = NULL;

	if(!a) return NULL;

	if(!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||

	    !(strtmp = BN_bn2dec(bntmp)) )

		X509V3err(X509V3_F_I2S_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);

	BN_free(bntmp);

	return strtmp;

}

EXPORT_C char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)

{

	BIGNUM *bntmp = NULL;

	char *strtmp = NULL;

	if(!a) return NULL;

	if(!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||

	    !(strtmp = BN_bn2dec(bntmp)) )

		X509V3err(X509V3_F_I2S_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);

	BN_free(bntmp);

	return strtmp;

}

EXPORT_C ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)

{

	BIGNUM *bn = NULL;

	ASN1_INTEGER *aint;

	int isneg, ishex;

	int ret;

	if (!value) {

		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_INVALID_NULL_VALUE);

		return 0;

	}

	bn = BN_new();

	if (value[0] == '-') {

		value++;

		isneg = 1;

	} else isneg = 0;

	if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {

		value += 2;

		ishex = 1;

	} else ishex = 0;

	if (ishex) ret = BN_hex2bn(&bn, value);

	else ret = BN_dec2bn(&bn, value);

	if (!ret || value[ret]) {

		BN_free(bn);

		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_DEC2BN_ERROR);

		return 0;

	}

	if (isneg && BN_is_zero(bn)) isneg = 0;

	aint = BN_to_ASN1_INTEGER(bn, NULL);

	BN_free(bn);

	if (!aint) {

		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_TO_ASN1_INTEGER_ERROR);

		return 0;

	}

	if (isneg) aint->type |= V_ASN1_NEG;

	return aint;

}

EXPORT_C int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,

	     STACK_OF(CONF_VALUE) **extlist)

{

	char *strtmp;

	int ret;

	if(!aint) return 1;

	if(!(strtmp = i2s_ASN1_INTEGER(NULL, aint))) return 0;

	ret = X509V3_add_value(name, strtmp, extlist);

	OPENSSL_free(strtmp);

	return ret;

}

EXPORT_C int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)

{

	char *btmp;

	if(!(btmp = value->value)) goto err;

	if(!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")

		 || !strcmp(btmp, "Y") || !strcmp(btmp, "y")

		|| !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {

		*asn1_bool = 0xff;

		return 1;

	} else if(!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")

		 || !strcmp(btmp, "N") || !strcmp(btmp, "n")

		|| !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {

		*asn1_bool = 0;

		return 1;

	}

	err:

	X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,X509V3_R_INVALID_BOOLEAN_STRING);

	X509V3_conf_err(value);

	return 0;

}

EXPORT_C int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)

{

	ASN1_INTEGER *itmp;

	if(!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {

		X509V3_conf_err(value);

		return 0;

	}

	*aint = itmp;

	return 1;

}

#define HDR_NAME	1

#define HDR_VALUE	2

/*#define DEBUG*/

EXPORT_C STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)

{

	char *p, *q, c;

	char *ntmp, *vtmp;

	STACK_OF(CONF_VALUE) *values = NULL;

	char *linebuf;

	int state;

	/* We are going to modify the line so copy it first */

	linebuf = BUF_strdup(line);

	state = HDR_NAME;

	ntmp = NULL;

	/* Go through all characters */

	for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {

		switch(state) {

			case HDR_NAME:

			if(c == ':') {

				state = HDR_VALUE;

				*p = 0;

				ntmp = strip_spaces(q);

				if(!ntmp) {

					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);

					goto err;

				}

				q = p + 1;

			} else if(c == ',') {

				*p = 0;

				ntmp = strip_spaces(q);

				q = p + 1;

#if 0

				printf("%s\n", ntmp);

#endif

				if(!ntmp) {

					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);

					goto err;

				}

				X509V3_add_value(ntmp, NULL, &values);

			}

			break ;

			case HDR_VALUE:

			if(c == ',') {

				state = HDR_NAME;

				*p = 0;

				vtmp = strip_spaces(q);

#if 0

				printf("%s\n", ntmp);

#endif

				if(!vtmp) {

					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);

					goto err;

				}

				X509V3_add_value(ntmp, vtmp, &values);

				ntmp = NULL;

				q = p + 1;

			}

		}

	}

	if(state == HDR_VALUE) {

		vtmp = strip_spaces(q);

#if 0

		printf("%s=%s\n", ntmp, vtmp);

#endif

		if(!vtmp) {

			X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);

			goto err;

		}

		X509V3_add_value(ntmp, vtmp, &values);

	} else {

		ntmp = strip_spaces(q);

#if 0

		printf("%s\n", ntmp);

#endif

		if(!ntmp) {

			X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);

			goto err;

		}

		X509V3_add_value(ntmp, NULL, &values);

	}

OPENSSL_free(linebuf);

return values;

err:

OPENSSL_free(linebuf);

sk_CONF_VALUE_pop_free(values, X509V3_conf_free);

return NULL;

}

/* Delete leading and trailing spaces from a string */

static char *strip_spaces(char *name)

{

	char *p, *q;

	/* Skip over leading spaces */

	p = name;

	while(*p && isspace((unsigned char)*p)) p++;

	if(!*p) return NULL;

	q = p + strlen(p) - 1;

	while((q != p) && isspace((unsigned char)*q)) q--;

	if(p != q) q[1] = 0;

	if(!*p) return NULL;

	return p;

}

/* hex string utilities */

/* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its

 * hex representation

 * @@@ (Contents of buffer are always kept in ASCII, also on EBCDIC machines)

 */

EXPORT_C char *hex_to_string(unsigned char *buffer, long len)

{

	char *tmp, *q;

	unsigned char *p;

	int i;

#ifndef EMULATOR	

	static char hexdig[] = "0123456789ABCDEF";

#else

    static const char hexdig[] = "0123456789ABCDEF";

#endif	

	if(!buffer || !len) return NULL;

	if(!(tmp = OPENSSL_malloc(len * 3 + 1))) {

		X509V3err(X509V3_F_HEX_TO_STRING,ERR_R_MALLOC_FAILURE);

		return NULL;

	}

	q = tmp;

	for(i = 0, p = buffer; i < len; i++,p++) {

		*q++ = hexdig[(*p >> 4) & 0xf];

		*q++ = hexdig[*p & 0xf];

		*q++ = ':';

	}

	q[-1] = 0;

#ifdef CHARSET_EBCDIC

	ebcdic2ascii(tmp, tmp, q - tmp - 1);

#endif

	return tmp;

}

/* Give a string of hex digits convert to

 * a buffer

 */

EXPORT_C unsigned char *string_to_hex(char *str, long *len)

{

	unsigned char *hexbuf, *q;

	unsigned char ch, cl, *p;

	if(!str) {

		X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_INVALID_NULL_ARGUMENT);

		return NULL;

	}

	if(!(hexbuf = OPENSSL_malloc(strlen(str) >> 1))) goto err;

	for(p = (unsigned char *)str, q = hexbuf; *p;) {

		ch = *p++;

#ifdef CHARSET_EBCDIC

		ch = os_toebcdic[ch];

#endif

		if(ch == ':') continue;

		cl = *p++;

#ifdef CHARSET_EBCDIC

		cl = os_toebcdic[cl];

#endif

		if(!cl) {

			X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ODD_NUMBER_OF_DIGITS);

			OPENSSL_free(hexbuf);

			return NULL;

		}

		if(isupper(ch)) ch = tolower(ch);

		if(isupper(cl)) cl = tolower(cl);

		if((ch >= '0') && (ch <= '9')) ch -= '0';

		else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;

		else goto badhex;

		if((cl >= '0') && (cl <= '9')) cl -= '0';

		else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;

		else goto badhex;

		*q++ = (ch << 4) | cl;

	}

	if(len) *len = q - hexbuf;

	return hexbuf;

	err:

	if(hexbuf) OPENSSL_free(hexbuf);

	X509V3err(X509V3_F_STRING_TO_HEX,ERR_R_MALLOC_FAILURE);

	return NULL;

	badhex:

	OPENSSL_free(hexbuf);

	X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ILLEGAL_HEX_DIGIT);

	return NULL;

}

/* V2I name comparison function: returns zero if 'name' matches

 * cmp or cmp.*

 */

EXPORT_C int name_cmp(const char *name, const char *cmp)

{

	int len, ret;

	char c;

	len = strlen(cmp);

	if((ret = strncmp(name, cmp, len))) return ret;

	c = name[len];

	if(!c || (c=='.')) return 0;

	return 1;

}

static int sk_strcmp(const char * const *a, const char * const *b)

{

	return strcmp(*a, *b);

}

EXPORT_C STACK *X509_get1_email(X509 *x)

{

	GENERAL_NAMES *gens;

	STACK *ret;

	gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);

	ret = get_email(X509_get_subject_name(x), gens);

	sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

	return ret;

}

EXPORT_C STACK *X509_REQ_get1_email(X509_REQ *x)

{

	GENERAL_NAMES *gens;

	STACK_OF(X509_EXTENSION) *exts;

	STACK *ret;

	exts = X509_REQ_get_extensions(x);

	gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);

	ret = get_email(X509_REQ_get_subject_name(x), gens);

	sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

	sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);

	return ret;

}

static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens)

{

	STACK *ret = NULL;

	X509_NAME_ENTRY *ne;

	ASN1_IA5STRING *email;

	GENERAL_NAME *gen;

	int i;

	/* Now add any email address(es) to STACK */

	i = -1;

	/* First supplied X509_NAME */

	while((i = X509_NAME_get_index_by_NID(name,

					 NID_pkcs9_emailAddress, i)) >= 0) {

		ne = X509_NAME_get_entry(name, i);

		email = X509_NAME_ENTRY_get_data(ne);

		if(!append_ia5(&ret, email)) return NULL;

	}

	for(i = 0; i < sk_GENERAL_NAME_num(gens); i++)

	{

		gen = sk_GENERAL_NAME_value(gens, i);

		if(gen->type != GEN_EMAIL) continue;

		if(!append_ia5(&ret, gen->d.ia5)) return NULL;

	}

	return ret;

}

static void str_free(void *str)

{

	OPENSSL_free(str);

}

static int append_ia5(STACK **sk, ASN1_IA5STRING *email)

{

	char *emtmp;

	/* First some sanity checks */

	if(email->type != V_ASN1_IA5STRING) return 1;

	if(!email->data || !email->length) return 1;

	if(!*sk) *sk = sk_new(sk_strcmp);

	if(!*sk) return 0;

	/* Don't add duplicates */

	if(sk_find(*sk, (char *)email->data) != -1) return 1;

	emtmp = BUF_strdup((char *)email->data);

	if(!emtmp || !sk_push(*sk, emtmp)) {

		X509_email_free(*sk);

		*sk = NULL;

		return 0;

	}

	return 1;

}

EXPORT_C void X509_email_free(STACK *sk)

{

	sk_pop_free(sk, str_free);

}

/* Convert IP addresses both IPv4 and IPv6 into an 

 * OCTET STRING compatible with RFC3280.

 */

EXPORT_C ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)

	{

	unsigned char ipout[16];

	ASN1_OCTET_STRING *ret;

	int iplen;

	/* If string contains a ':' assume IPv6 */

	iplen = a2i_ipadd(ipout, ipasc);

	if (!iplen)

		return NULL;

	ret = ASN1_OCTET_STRING_new();

	if (!ret)

		return NULL;

	if (!ASN1_OCTET_STRING_set(ret, ipout, iplen))

		{

		ASN1_OCTET_STRING_free(ret);

		return NULL;

		}

	return ret;

	}

EXPORT_C ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)

	{

	ASN1_OCTET_STRING *ret = NULL;

	unsigned char ipout[32];

	char *iptmp = NULL, *p;

	int iplen1, iplen2;

	p = strchr(ipasc,'/');

	if (!p)

		return NULL;

	iptmp = BUF_strdup(ipasc);

	if (!iptmp)

		return NULL;

	p = iptmp + (p - ipasc);

	*p++ = 0;

	iplen1 = a2i_ipadd(ipout, iptmp);

	if (!iplen1)

		goto err;

	iplen2 = a2i_ipadd(ipout + iplen1, p);

	OPENSSL_free(iptmp);

	iptmp = NULL;

	if (!iplen2 || (iplen1 != iplen2))

		goto err;

	ret = ASN1_OCTET_STRING_new();

	if (!ret)

		goto err;

	if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))

		goto err;

	return ret;

	err:

	if (iptmp)

		OPENSSL_free(iptmp);

	if (ret)

		ASN1_OCTET_STRING_free(ret);

	return NULL;

	}

EXPORT_C int a2i_ipadd(unsigned char *ipout, const char *ipasc)

	{

	/* If string contains a ':' assume IPv6 */

	if (strchr(ipasc, ':'))

		{

		if (!ipv6_from_asc(ipout, ipasc))

			return 0;

		return 16;

		}

	else

		{

		if (!ipv4_from_asc(ipout, ipasc))

			return 0;

		return 4;

		}

	}

static int ipv4_from_asc(unsigned char *v4, const char *in)

	{

	int a0, a1, a2, a3;

	if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)

		return 0;

	if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)

		|| (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))

		return 0;

	v4[0] = a0;

	v4[1] = a1;

	v4[2] = a2;

	v4[3] = a3;

	return 1;

	}

typedef struct {

		/* Temporary store for IPV6 output */

		unsigned char tmp[16];

		/* Total number of bytes in tmp */

		int total;

		/* The position of a zero (corresponding to '::') */

		int zero_pos;

		/* Number of zeroes */

		int zero_cnt;

	} IPV6_STAT;

static int ipv6_from_asc(unsigned char *v6, const char *in)

	{

	IPV6_STAT v6stat;

	v6stat.total = 0;

	v6stat.zero_pos = -1;

	v6stat.zero_cnt = 0;

	/* Treat the IPv6 representation as a list of values

	 * separated by ':'. The presence of a '::' will parse

 	 * as one, two or three zero length elements.

	 */

	if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))

		return 0;

	/* Now for some sanity checks */

	if (v6stat.zero_pos == -1)

		{

		/* If no '::' must have exactly 16 bytes */

		if (v6stat.total != 16)

			return 0;

		}

	else 

		{

		/* If '::' must have less than 16 bytes */

		if (v6stat.total == 16)

			return 0;

		/* More than three zeroes is an error */

		if (v6stat.zero_cnt > 3)

			return 0;

		/* Can only have three zeroes if nothing else present */

		else if (v6stat.zero_cnt == 3)

			{

			if (v6stat.total > 0)

				return 0;

			}

		/* Can only have two zeroes if at start or end */

		else if (v6stat.zero_cnt == 2)

			{

			if ((v6stat.zero_pos != 0)

				&& (v6stat.zero_pos != v6stat.total))

				return 0;

			}

		else 

		/* Can only have one zero if *not* start or end */

			{

			if ((v6stat.zero_pos == 0)

				|| (v6stat.zero_pos == v6stat.total))

				return 0;

			}

		}

	/* Format result */

	/* Copy initial part */

	if (v6stat.zero_pos > 0)

		memcpy(v6, v6stat.tmp, v6stat.zero_pos);

	/* Zero middle */

	if (v6stat.total != 16)

		memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);

	/* Copy final part */

	if (v6stat.total != v6stat.zero_pos)

		memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,

			v6stat.tmp + v6stat.zero_pos,

			v6stat.total - v6stat.zero_pos);

	return 1;

	}

static int ipv6_cb(const char *elem, int len, void *usr)

	{

	IPV6_STAT *s = usr;

	/* Error if 16 bytes written */

	if (s->total == 16)

		return 0;

	if (len == 0)

		{

		/* Zero length element, corresponds to '::' */

		if (s->zero_pos == -1)

			s->zero_pos = s->total;

		/* If we've already got a :: its an error */

		else if (s->zero_pos != s->total)

			return 0;

		s->zero_cnt++;

		}

	else 

		{

		/* If more than 4 characters could be final a.b.c.d form */

		if (len > 4)

			{

			/* Need at least 4 bytes left */

			if (s->total > 12)

				return 0;

			/* Must be end of string */

			if (elem[len])

				return 0;

			if (!ipv4_from_asc(s->tmp + s->total, elem))

				return 0;

			s->total += 4;

			}

		else

			{

			if (!ipv6_hex(s->tmp + s->total, elem, len))

				return 0;

			s->total += 2;

			}

		}

	return 1;

	}

/* Convert a string of up to 4 hex digits into the corresponding

 * IPv6 form.

 */

static int ipv6_hex(unsigned char *out, const char *in, int inlen)

	{

	unsigned char c;

	unsigned int num = 0;

	if (inlen > 4)

		return 0;

	while(inlen--)

		{

		c = *in++;

		num <<= 4;

		if ((c >= '0') && (c <= '9'))

			num |= c - '0';

		else if ((c >= 'A') && (c <= 'F'))

			num |= c - 'A' + 10;

		else if ((c >= 'a') && (c <= 'f'))

			num |=  c - 'a' + 10;

		else

			return 0;

		}

	out[0] = num >> 8;

	out[1] = num & 0xff;

	return 1;

	}

EXPORT_C int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk,

						unsigned long chtype)

	{

	CONF_VALUE *v;

	int i, mval;

	char *p, *type;

	if (!nm)

		return 0;

	for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++)

		{

		v=sk_CONF_VALUE_value(dn_sk,i);

		type=v->name;

		/* Skip past any leading X. X: X, etc to allow for

		 * multiple instances 

		 */

		for(p = type; *p ; p++) 

#ifndef CHARSET_EBCDIC

			if ((*p == ':') || (*p == ',') || (*p == '.'))

#else

			if ((*p == os_toascii[':']) || (*p == os_toascii[',']) || (*p == os_toascii['.']))

#endif

				{

				p++;

				if(*p) type = p;

				break;

				}

#ifndef CHARSET_EBCDIC

		if (*type == '+')

#else

		if (*type == os_toascii['+'])

#endif

			{

			mval = -1;

			type++;

			}

		else

			mval = 0;

		if (!X509_NAME_add_entry_by_txt(nm,type, chtype,

				(unsigned char *) v->value,-1,-1,mval))

					return 0;

		}

	return 1;

	}