/* $OpenBSD: x509_obj.c,v 1.16 2014/07/11 08:44:49 jsing Exp $ */
/* 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 <string.h>

#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/objects.h>
#include <openssl/x509.h>

char *
X509_NAME_oneline(X509_NAME *a, char *buf, int len)
{
	X509_NAME_ENTRY *ne;
	int i;
	int n, lold, l, l1, l2, num, j, type;
	const char *s;
	char *p;
	unsigned char *q;
	BUF_MEM *b = NULL;
	static const char hex[17] = "0123456789ABCDEF";
	int gs_doit[4];
	char tmp_buf[80];

	if (buf == NULL) {
		if ((b = BUF_MEM_new()) == NULL)
			goto err;
		if (!BUF_MEM_grow(b, 200))
			goto err;
		b->data[0] = '\0';
		len = 200;
	}
	if (a == NULL) {
		if (b) {
			buf = b->data;
			free(b);
		}
		strlcpy(buf, "NO X509_NAME", len);
		return buf;
	}

	len--; /* space for '\0' */
	l = 0;
	for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
		ne = sk_X509_NAME_ENTRY_value(a->entries, i);
		n = OBJ_obj2nid(ne->object);
		if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {
			i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);
			s = tmp_buf;
		}
		l1 = strlen(s);

		type = ne->value->type;
		num = ne->value->length;
		q = ne->value->data;
		if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {
			gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;
			for (j = 0; j < num; j++)
				if (q[j] != 0)
					gs_doit[j & 3] = 1;

			if (gs_doit[0]|gs_doit[1]|gs_doit[2])
				gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;
			else {
				gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;
				gs_doit[3] = 1;
			}
		} else
			gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;

		for (l2 = j=0; j < num; j++) {
			if (!gs_doit[j&3])
				continue;
			l2++;
			if ((q[j] < ' ') || (q[j] > '~'))
				l2 += 3;
		}

		lold = l;
		l += 1 + l1 + 1 + l2;
		if (b != NULL) {
			if (!BUF_MEM_grow(b, l + 1))
				goto err;
			p = &(b->data[lold]);
		} else if (l > len) {
			break;
		} else
			p = &(buf[lold]);
		*(p++) = '/';
		memcpy(p, s, l1);
		p += l1;
		*(p++) = '=';
		q = ne->value->data;
		for (j = 0; j < num; j++) {
			if (!gs_doit[j & 3])
				continue;
			n = q[j];
			if ((n < ' ') || (n > '~')) {
				*(p++) = '\\';
				*(p++) = 'x';
				*(p++) = hex[(n >> 4) & 0x0f];
				*(p++) = hex[n & 0x0f];
			} else
				*(p++) = n;
		}
		*p = '\0';
	}
	if (b != NULL) {
		p = b->data;
		free(b);
	} else
		p = buf;
	if (i == 0)
		*p = '\0';
	return (p);

err:
	X509err(X509_F_X509_NAME_ONELINE, ERR_R_MALLOC_FAILURE);
	if (b != NULL)
		BUF_MEM_free(b);
	return (NULL);
}