Refactor Sha API to return raw bytes, added Sha1() function.

This commit is contained in:
Jordan Bancino 2023-06-17 17:36:11 +00:00
parent 280838ddd6
commit f5abcf5e50
3 changed files with 104 additions and 35 deletions

View file

@ -21,30 +21,28 @@
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Sha.h>
#include <Memory.h>
#ifndef CYTOPLASM_SHA2_H
#define CYTOPLASM_SHA2_H
#include <stdio.h>
#include <string.h>
/***
* @Nm Sha2
* @Nd A simple implementation of the SHA2 hashing functions.
* @Dd December 19 2022
* @Xr Memory Base64
*
* This API defines simple functions for computing SHA2 hashes.
* At the moment, it only defines
* .Fn Sha256 ,
* which computes the SHA-256 hash of the given C string. 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.
*/
char *
ShaToHex(unsigned char *bytes)
{
size_t i = 0;
char *str = Malloc(((strlen((char *) bytes) * 2) + 1) * sizeof(char));
/**
* This function takes a pointer to a NULL-terminated C string, and
* returns a string allocated on the heap using the Memory API, or
* NULL if there was an error allocating memory. The returned string
* should be freed when it is no longer needed.
*/
extern char * Sha256(char *);
if (!str)
{
return NULL;
}
#endif /* CYTOPLASM_SHA2_H */
while (bytes[i] != '\0')
{
snprintf(str + (2 * i), 3, "%02x", bytes[i]);
i++;
}
return str;
}

View file

@ -21,7 +21,7 @@
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Sha2.h>
#include <Sha.h>
#include <Memory.h>
#include <Int.h>
@ -170,13 +170,12 @@ Sha256Process(Sha256Context * context, unsigned char *data, size_t length)
}
}
char *
unsigned char *
Sha256(char *str)
{
Sha256Context context;
size_t i;
unsigned char out[32];
char *outStr;
unsigned char *out;
unsigned char fill[64];
UInt32 fillLen;
@ -189,8 +188,8 @@ Sha256(char *str)
return NULL;
}
outStr = Malloc(65);
if (!outStr)
out = Malloc(33 * sizeof(unsigned char));
if (!out)
{
return NULL;
}
@ -228,11 +227,7 @@ Sha256(char *str)
PUT_UINT32(&out[4 * i], context.state[i]);
}
/* Convert to string */
for (i = 0; i < 32; i++)
{
snprintf(outStr + (2 * i), 3, "%02x", out[i]);
}
out[32] = '\0';
return outStr;
return out;
}

76
src/include/Sha.h Normal file
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@ -0,0 +1,76 @@
/*
* 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 */