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/* Copyright (C) 2021 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 digest
*
* \brief Data hashing operations.
*
* @{
*/
#pragma once
#include "libdnssec/binary.h"
#include "libdnssec/error.h"
typedef enum {
DNSSEC_DIGEST_INVALID = 0,
DNSSEC_DIGEST_SHA384 = 1,
DNSSEC_DIGEST_SHA512 = 2,
} dnssec_digest_t;
struct dnssec_digest_ctx;
typedef struct dnssec_digest_ctx dnssec_digest_ctx_t;
/*!
* \brief Initialize digest context.
*
* \param algorithm Hasing algorithm to be used.
* \param out_ctx Output: context structure to be initialized.
*
* \return DNSSEC_E*
*/
int dnssec_digest_init(dnssec_digest_t algorithm, dnssec_digest_ctx_t **out_ctx);
/*!
* \brief Digest data.
*
* \param ctx Digest context.
* \param data Data to be hashed.
*
* \note This function may be invoked repeatedly for single digest context,
* hashing all data as concatenated.
*
* \return DNSSEC_E*
*
* \note If error is returned, the digest context is automatically disposed.
*/
int dnssec_digest(dnssec_digest_ctx_t *ctx, dnssec_binary_t *data);
/*!
* \brief Finalize digest, dispose digest context and return the hash.
*
* \param ctx Digest context.
* \param out Output: computed hash.
*
* \return DNSSEC_E*
*/
int dnssec_digest_finish(dnssec_digest_ctx_t *ctx, dnssec_binary_t *out);
/*! @} */
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