/* $OpenBSD: evp_asn1.c,v 1.19 2017/01/29 17:49:22 beck 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/asn1.h>
#include <openssl/asn1_mac.h>
#include <openssl/err.h>

int
ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
{
	ASN1_STRING *os;

	if ((os = ASN1_OCTET_STRING_new()) == NULL)
		return (0);
	if (!ASN1_STRING_set(os, data, len)) {
		ASN1_OCTET_STRING_free(os);
		return (0);
	}
	ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
	return (1);
}

/* int max_len:  for returned value    */
int
ASN1_TYPE_get_octetstring(ASN1_TYPE *a, unsigned char *data, int max_len)
{
	int ret, num;
	unsigned char *p;

	if ((a->type != V_ASN1_OCTET_STRING) ||
	    (a->value.octet_string == NULL)) {
		ASN1error(ASN1_R_DATA_IS_WRONG);
		return (-1);
	}
	p = ASN1_STRING_data(a->value.octet_string);
	ret = ASN1_STRING_length(a->value.octet_string);
	if (ret < max_len)
		num = ret;
	else
		num = max_len;
	memcpy(data, p, num);
	return (ret);
}

int
ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
    int len)
{
	int n, size;
	ASN1_OCTET_STRING os, *osp;
	ASN1_INTEGER in;
	unsigned char *p;
	unsigned char buf[32]; /* when they have 256bit longs,
				* I'll be in trouble */
	in.data = buf;
	in.length = 32;
	os.data = data;
	os.type = V_ASN1_OCTET_STRING;
	os.length = len;
	ASN1_INTEGER_set(&in, num);
	n = i2d_ASN1_INTEGER(&in, NULL);
	n += i2d_ASN1_bytes((ASN1_STRING *)&os, NULL, V_ASN1_OCTET_STRING,
	    V_ASN1_UNIVERSAL);

	size = ASN1_object_size(1, n, V_ASN1_SEQUENCE);

	if ((osp = ASN1_STRING_new()) == NULL)
		return (0);
	/* Grow the 'string' */
	if (!ASN1_STRING_set(osp, NULL, size)) {
		ASN1_STRING_free(osp);
		return (0);
	}

	ASN1_STRING_length_set(osp, size);
	p = ASN1_STRING_data(osp);

	ASN1_put_object(&p, 1,n, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL);
	i2d_ASN1_INTEGER(&in, &p);
	i2d_ASN1_bytes((ASN1_STRING *)&os, &p, V_ASN1_OCTET_STRING,
	    V_ASN1_UNIVERSAL);

	ASN1_TYPE_set(a, V_ASN1_SEQUENCE, osp);
	return (1);
}

/* we return the actual length..., num may be missing, in which
 * case, set it to zero */
/* int max_len:  for returned value    */
int
ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a, long *num, unsigned char *data,
    int max_len)
{
	int ret = -1, n;
	ASN1_INTEGER *ai = NULL;
	ASN1_OCTET_STRING *os = NULL;
	const unsigned char *p;
	long length;
	ASN1_const_CTX c;

	if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
		goto err;
	}
	p = ASN1_STRING_data(a->value.sequence);
	length = ASN1_STRING_length(a->value.sequence);

	c.pp = &p;
	c.p = p;
	c.max = p + length;
	c.error = ASN1_R_DATA_IS_WRONG;

	M_ASN1_D2I_start_sequence();
	c.q = c.p;
	if ((ai = d2i_ASN1_INTEGER(NULL, &c.p, c.slen)) == NULL)
		goto err;
	c.slen -= (c.p - c.q);
	c.q = c.p;
	if ((os = d2i_ASN1_OCTET_STRING(NULL, &c.p, c.slen)) == NULL)
		goto err;
	c.slen -= (c.p - c.q);
	if (!M_ASN1_D2I_end_sequence())
		goto err;

	if (num != NULL)
		*num = ASN1_INTEGER_get(ai);

	ret = ASN1_STRING_length(os);
	if (max_len > ret)
		n = ret;
	else
		n = max_len;

	if (data != NULL)
		memcpy(data, ASN1_STRING_data(os), n);
	if (0) {
err:
		ASN1error(ASN1_R_DATA_IS_WRONG);
	}
	ASN1_OCTET_STRING_free(os);
	ASN1_INTEGER_free(ai);
	return (ret);
}
