/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0 AND ISC
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

/*
 * Copyright (C) Network Associates, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*! \file */
#pragma once

#include <isc/lang.h>

#include <dst/dst.h>

#define MAXFIELDSIZE 512

/*
 * Maximum number of fields in a private file is 18 (12 algorithm-
 * specific fields for RSA, plus 6 generic fields).
 */
#define MAXFIELDS 12 + 6

#define TAG_SHIFT     4
#define TAG_ALG(tag)  ((unsigned int)(tag) >> TAG_SHIFT)
#define TAG(alg, off) (((alg) << TAG_SHIFT) + (off))

/* These are used by RSA-SHA1, RSASHA256 and RSASHA512 */
#define RSA_NTAGS		11
#define TAG_RSA_MODULUS		((DST_ALG_RSA << TAG_SHIFT) + 0)
#define TAG_RSA_PUBLICEXPONENT	((DST_ALG_RSA << TAG_SHIFT) + 1)
#define TAG_RSA_PRIVATEEXPONENT ((DST_ALG_RSA << TAG_SHIFT) + 2)
#define TAG_RSA_PRIME1		((DST_ALG_RSA << TAG_SHIFT) + 3)
#define TAG_RSA_PRIME2		((DST_ALG_RSA << TAG_SHIFT) + 4)
#define TAG_RSA_EXPONENT1	((DST_ALG_RSA << TAG_SHIFT) + 5)
#define TAG_RSA_EXPONENT2	((DST_ALG_RSA << TAG_SHIFT) + 6)
#define TAG_RSA_COEFFICIENT	((DST_ALG_RSA << TAG_SHIFT) + 7)
#define TAG_RSA_ENGINE		((DST_ALG_RSA << TAG_SHIFT) + 8)
#define TAG_RSA_LABEL		((DST_ALG_RSA << TAG_SHIFT) + 9)

#define ECDSA_NTAGS	     4
#define TAG_ECDSA_PRIVATEKEY ((DST_ALG_ECDSA256 << TAG_SHIFT) + 0)
#define TAG_ECDSA_ENGINE     ((DST_ALG_ECDSA256 << TAG_SHIFT) + 1)
#define TAG_ECDSA_LABEL	     ((DST_ALG_ECDSA256 << TAG_SHIFT) + 2)

#define EDDSA_NTAGS	     4
#define TAG_EDDSA_PRIVATEKEY ((DST_ALG_ED25519 << TAG_SHIFT) + 0)
#define TAG_EDDSA_ENGINE     ((DST_ALG_ED25519 << TAG_SHIFT) + 1)
#define TAG_EDDSA_LABEL	     ((DST_ALG_ED25519 << TAG_SHIFT) + 2)

#define OLD_HMACMD5_NTAGS 1
#define HMACMD5_NTAGS	  2
#define TAG_HMACMD5_KEY	  ((DST_ALG_HMACMD5 << TAG_SHIFT) + 0)
#define TAG_HMACMD5_BITS  ((DST_ALG_HMACMD5 << TAG_SHIFT) + 1)

#define HMACSHA1_NTAGS	  2
#define TAG_HMACSHA1_KEY  ((DST_ALG_HMACSHA1 << TAG_SHIFT) + 0)
#define TAG_HMACSHA1_BITS ((DST_ALG_HMACSHA1 << TAG_SHIFT) + 1)

#define HMACSHA224_NTAGS    2
#define TAG_HMACSHA224_KEY  ((DST_ALG_HMACSHA224 << TAG_SHIFT) + 0)
#define TAG_HMACSHA224_BITS ((DST_ALG_HMACSHA224 << TAG_SHIFT) + 1)

#define HMACSHA256_NTAGS    2
#define TAG_HMACSHA256_KEY  ((DST_ALG_HMACSHA256 << TAG_SHIFT) + 0)
#define TAG_HMACSHA256_BITS ((DST_ALG_HMACSHA256 << TAG_SHIFT) + 1)

#define HMACSHA384_NTAGS    2
#define TAG_HMACSHA384_KEY  ((DST_ALG_HMACSHA384 << TAG_SHIFT) + 0)
#define TAG_HMACSHA384_BITS ((DST_ALG_HMACSHA384 << TAG_SHIFT) + 1)

#define HMACSHA512_NTAGS    2
#define TAG_HMACSHA512_KEY  ((DST_ALG_HMACSHA512 << TAG_SHIFT) + 0)
#define TAG_HMACSHA512_BITS ((DST_ALG_HMACSHA512 << TAG_SHIFT) + 1)

struct dst_private_element {
	unsigned short tag;
	unsigned short length;
	unsigned char *data;
};

typedef struct dst_private_element dst_private_element_t;

struct dst_private {
	unsigned short nelements;
	dst_private_element_t elements[MAXFIELDS];
};

typedef struct dst_private dst_private_t;

ISC_LANG_BEGINDECLS

void
dst__privstruct_free(dst_private_t *priv, isc_mem_t *mctx);

isc_result_t
dst__privstruct_parse(dst_key_t *key, unsigned int alg, isc_lex_t *lex,
		      isc_mem_t *mctx, dst_private_t *priv);

isc_result_t
dst__privstruct_writefile(const dst_key_t *key, const dst_private_t *priv,
			  const char *directory);

isc_result_t
dst__privelement_is_nul_terminated(
	const dst_private_element_t *dst_private_element_t);

ISC_LANG_ENDDECLS
