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/*
* Copyright 2021-2022 Eduardo Chappa
*
* 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
*
*/
/* This algorithm is taken from the code in RFC 4634 */
#include "c-client.h"
#include "sha.h"
#include "hmac.c"
#include "sha1.c"
#include "usha.c"
#include "sha224-256.c"
#include "sha384-512.c"
struct hash {
char *name;
SHAversion whichSha;
int hashsize;
} hashes[] = {
{"SHA1", CCSHA1, SHA1HashSize},
{"SHA224", CCSHA224, SHA224HashSize},
{"SHA256", CCSHA256, SHA256HashSize},
{"SHA384", CCSHA384, SHA384HashSize},
{"SHA512", CCSHA512, SHA512HashSize},
{NIL, CCSHA512, SHA512HashSize}
};
static const char hexdigits[] = "0123456789abcdef";
char *hash_from_sizedtext(char *hash, char *text, size_t len, unsigned char **digest)
{
char *rv = NIL;
USHAContext sha;
HMACContext hmac;
uint8_t Message_Digest[USHAMaxHashSize];
int i, hashno;
unsigned long len2;
if(digest) *digest = NIL;
if(!hash || !text) return NIL;
for(hashno = 0; hashes[hashno].name != NIL; hashno++)
if(!compare_cstring(hashes[hashno].name, hash))
break;
if(hashno >= 0 && hashno <= USHAMaxHashSize && hashes[hashno].name){
memset(&sha, '\343', sizeof(USHAContext));
memset(&hmac, '\343', sizeof(HMACContext));
if(USHAReset(&sha, hashes[hashno].whichSha) == shaSuccess
&& USHAInput(&sha, (const uint8_t *) text, len) == shaSuccess){
if(USHAResult(&sha, (uint8_t *) Message_Digest) == shaSuccess){
if(digest) *digest = rfc822_urlbinary((void *) Message_Digest, hashes[hashno].hashsize, &len2);
rv = fs_get(2*hashes[hashno].hashsize + 1);
for (i = 0; i < hashes[hashno].hashsize ; ++i) {
rv[2*i] = hexdigits[(Message_Digest[i] >> 4) & 0xF];
rv[2*i+1] = hexdigits[Message_Digest[i] & 0xF];
}
rv[2*i] = '\0';
}
}
}
return rv;
}
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