Cytoplasm/src/include/Sha.h

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/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef CYTOPLASM_SHA_H
#define CYTOPLASM_SHA_H
/***
* @Nm Sha
* @Nd A simple implementation of a few SHA hashing functions.
* @Dd December 19 2022
* @Xr Memory Base64
*
* This API defines simple functions for computing SHA hashes.
* At the moment, it only defines
* .Fn Sha256
* and
* .Fn Sha1 ,
* which compute the SHA-256 and SHA-1 hashes of the given C string,
* respectively. It is not trivial to implement SHA-512 in ANSI C
* due to the lack of a 64-bit integer type, so that hash
* function has been omitted.
*/
/**
* This function takes a pointer to a NULL-terminated C string, and
* returns a NULL-terminated byte buffer allocated on the heap using
* the Memory API, or NULL if there was an error allocating memory.
* The returned byte buffer should be freed when it is no longer
* needed. It is important to note that the returned buffer is not
* a printable string; to get a printable string, use
* .Fn ShaToHex .
*/
extern unsigned char * Sha256(char *);
/**
* This function takes a pointer to a NULL-terminated C string, and
* returns a NULL-terminated byte buffer allocated on the heap using
* the Memory API, or NULL if there was an error allocating memory.
* The returned byte buffer should be freed when it is no longer
* needed. It is important to note that the returned buffer is not
* a printable string; to get a printable string, use
* .Fn ShaToHex .
*/
extern unsigned char * Sha1(char *);
/**
* Convert a SHA byte buffer into a hex string. These hex strings
* are typically what is transmitted, stored, and compared, however
* there may be times when it is necessary to work with the raw
* bytes directly, which is why the conversion to a hex string is
* a separate step.
*/
extern char * ShaToHex(unsigned char *);
#endif /* CYTOPLASM_SHA_H */