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/* Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \addtogroup tsig
*
* \brief Low-level TSIG signing API.
*
* @{
*/
#pragma once
#include <stdint.h>
#include <libdnssec/binary.h>
/*!
* TSIG algorithms.
*
* \note The numeric values are library specific.
*/
typedef enum dnssec_tsig_algorithm {
DNSSEC_TSIG_UNKNOWN = 0,
DNSSEC_TSIG_HMAC_MD5,
DNSSEC_TSIG_HMAC_SHA1,
DNSSEC_TSIG_HMAC_SHA224,
DNSSEC_TSIG_HMAC_SHA256,
DNSSEC_TSIG_HMAC_SHA384,
DNSSEC_TSIG_HMAC_SHA512
} dnssec_tsig_algorithm_t;
/*!
* Get TSIG algorithm number from domain name.
*
* \see https://www.iana.org/assignments/tsig-algorithm-names/tsig-algorithm-names.xhtml
*
* \param dname Domain name of the algorithm (e.g., 0x0b hmac-sha256).
*
* \return TSIG algorithm.
*/
dnssec_tsig_algorithm_t dnssec_tsig_algorithm_from_dname(const uint8_t *dname);
/*!
* Get a domain name of the TSIG algorithm.
*
* \param algorithm TSIG algorithm.
*
* \return Domain name of the TSIG algorithm.
*/
const uint8_t *dnssec_tsig_algorithm_to_dname(dnssec_tsig_algorithm_t algorithm);
/*!
* Get TSIG algorithm from a MAC name.
*
* \param name MAC name (e.g., hmac-sha256).
*
* \return TSIG algorithm.
*/
dnssec_tsig_algorithm_t dnssec_tsig_algorithm_from_name(const char *name);
/*!
* Get MAC name from a TSIG algorithm.
*
* \param algorithm TSIG algorithm.
*
* \return MAC name of the TSIG algorithm.
*/
const char *dnssec_tsig_algorithm_to_name(dnssec_tsig_algorithm_t algorithm);
/*!
* Get optimal size of a TSIG algorithm.
*/
int dnssec_tsig_optimal_key_size(dnssec_tsig_algorithm_t algorithm);
struct dnssec_tsig_ctx;
/*!
* TSIG signing context.
*/
typedef struct dnssec_tsig_ctx dnssec_tsig_ctx_t;
/*!
* Create new TSIG signing context.
*
* \param[out] ctx Resulting TSIG context.
* \param[in] algorithm TSIG algorithm.
* \param[in] key Shared key to be used for signing.
*
* \return Error code, DNSSEC_EOK if successful.
*/
int dnssec_tsig_new(dnssec_tsig_ctx_t **ctx, dnssec_tsig_algorithm_t algorithm,
const dnssec_binary_t *key);
/*!
* Free the TSIG signing context.
*
* \param ctx TSIG signing context to be freed.
*/
void dnssec_tsig_free(dnssec_tsig_ctx_t *ctx);
/*!
* Add data to be signed by TSIG.
*
* \param ctx TSIG signing context.
* \param data Data to be signed.
*
* \return Error code, DNSSEC_EOK if successful.
*/
int dnssec_tsig_add(dnssec_tsig_ctx_t *ctx, const dnssec_binary_t *data);
/*!
* Get size of the TSIG signature for given signing context.
*
* \param ctx TSIG signing context.
*
* \return The size of the TSIG signature.
*/
size_t dnssec_tsig_size(dnssec_tsig_ctx_t *ctx);
/*!
* Get size of the TSIG signature for given algorithm.
*
* \param algorithm TSIG algorithm.
*
* \return The size of the TSIG signature.
*/
size_t dnssec_tsig_algorithm_size(dnssec_tsig_algorithm_t algorithm);
/*!
* Write TSIG signature.
*
* \param[in] ctx TSIG signing context.
* \param[out] mac Resulting TSIG signature.
*
* \return Error code, DNSSEC_EOK if successful.
*/
int dnssec_tsig_write(dnssec_tsig_ctx_t *ctx, uint8_t *mac);
/*! @} */
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