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/* vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80: */
/*
* Copyright 2017 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* \brief Cryptographic Hashing
* \defgroup hsh Hash
* @{
*/
#pragma once
#include <jose/cfg.h>
#include <jose/io.h>
#include <jansson.h>
#include <stdint.h>
/**
* Hashes data with the specified algorithm.
*
* This function hashes the first \p dlen bytes of \p data using the \p alg
* specified and returns the output as a URL-safe Base64 encoded JSON string.
*
* \param cfg The configuration context (optional).
* \param alg The hashing algorithm.
* \param data The input data buffer.
* \param dlen The length of the data in the input buffer.
* \return The hash as a URL-safe Base64 encoded JSON string.
*/
json_t *
hsh(jose_cfg_t *cfg, const char *alg, const void *data, size_t dlen);
/**
* Hashes data with the specified algorithm using IO chaining.
*
* This function creates an IO chain filter that takes the data to be hashed
* as input and outputs a hash of the input data.
*
* \param cfg The configuration context (optional).
* \param alg The hashing algorithm.
* \param next The size of the output hash buffer.
* \return The number of bytes written to the hash buffer or SIZE_MAX on error.
*/
jose_io_t *
hsh_io(jose_cfg_t *cfg, const char *alg, jose_io_t *next);
/**
* Hashes data with the specified algorithm into a buffer.
*
* This function hashes the first \p dlen bytes of \p data using the \p alg
* specified and stores the output in \p hash (a buffer of size \p hlen).
*
* If \p hash is NULL, the required size of the output buffer is returned.
*
* \param cfg The configuration context (optional).
* \param alg The hashing algorithm.
* \param data The input data buffer.
* \param dlen The length of the data in the input buffer.
* \param hash The output hash buffer.
* \param hlen The size of the output hash buffer.
* \return The number of bytes written to the hash buffer or SIZE_MAX on error.
*/
size_t
hsh_buf(jose_cfg_t *cfg, const char *alg,
const void *data, size_t dlen, void *hash, size_t hlen);
/** @} */
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