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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/>.
*/
/*!
* \brief Base32hex implementation (RFC 4648).
*
* \note Input Base32hex string can contain a-v characters. These characters
* are considered as A-V equivalent. Lower-case variant is used for encoding!
*/
#pragma once
#include <stdint.h>
/*!
* \brief Encodes binary data using Base32hex.
*
* \note Output data buffer contains Base32hex text string which isn't
* terminated with '\0'!
*
* \param in Input binary data.
* \param in_len Length of input data.
* \param out Output data buffer.
* \param out_len Size of output buffer.
*
* \retval >=0 length of output string.
* \retval KNOT_E* if error.
*/
int32_t knot_base32hex_encode(const uint8_t *in,
const uint32_t in_len,
uint8_t *out,
const uint32_t out_len);
/*!
* \brief Encodes binary data using Base32hex and output stores to own buffer.
*
* \note Output data buffer contains Base32hex text string which isn't
* terminated with '\0'!
*
* \note Output buffer should be deallocated after use.
*
* \param in Input binary data.
* \param in_len Length of input data.
* \param out Output data buffer.
*
* \retval >=0 length of output string.
* \retval KNOT_E* if error.
*/
int32_t knot_base32hex_encode_alloc(const uint8_t *in,
const uint32_t in_len,
uint8_t **out);
/*!
* \brief Decodes text data using Base32hex.
*
* \note Input data needn't be terminated with '\0'.
*
* \note Input data must be continuous Base32hex string!
*
* \param in Input text data.
* \param in_len Length of input string.
* \param out Output data buffer.
* \param out_len Size of output buffer.
*
* \retval >=0 length of output data.
* \retval KNOT_E* if error.
*/
int32_t knot_base32hex_decode(const uint8_t *in,
const uint32_t in_len,
uint8_t *out,
const uint32_t out_len);
/*!
* \brief Decodes text data using Base32hex and output stores to own buffer.
*
* \note Input data needn't be terminated with '\0'.
*
* \note Input data must be continuous Base32hex string!
*
* \note Output buffer should be deallocated after use.
*
* \param in Input text data.
* \param in_len Length of input string.
* \param out Output data buffer.
*
* \retval >=0 length of output data.
* \retval KNOT_E* if error.
*/
int32_t knot_base32hex_decode_alloc(const uint8_t *in,
const uint32_t in_len,
uint8_t **out);
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