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contact-hashes.c
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contact-hashes.c
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/*
* contact-hashes, Calculating a hash from phone number or email addresses
*
* ISC License
*
* Copyright (C) 2017 1984not Security GmbH
* Author: Max Bruckner (FSMaxB)
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sodium.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "contact-hashes.h"
char *hash_contact(const char * const contact, const size_t contact_length) {
const int algorithm = 2; // crypto_pwhash_argon2id_ALG_ARGON2ID13
const size_t opslimit = 2U;
const size_t memlimit = 4U * 1024U * 1024U; // 1 MiB
const size_t hash_bytes = 32U;
const unsigned char salt[] = "1984not contact";
assert(sizeof(salt) == crypto_pwhash_argon2i_SALTBYTES);
if (sodium_init() < 0) {
return NULL;
}
unsigned char hash[hash_bytes];
/* calculate the hash */
int status = crypto_pwhash(
hash,
sizeof(hash),
contact,
contact_length,
salt,
opslimit,
memlimit,
algorithm);
if (status != 0) {
return NULL;
}
/* encode as HEX */
char hex_hash[2 * hash_bytes + 1];
if (sodium_bin2hex(hex_hash, sizeof(hex_hash), hash, sizeof(hash)) == NULL) {
return NULL;
}
/* encode it into a general format */
const size_t max_encoded_size = sizeof("argon2id13-18446744073709551615-18446744073709551615-000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F");
char *encoded_hash = malloc(max_encoded_size);
if (encoded_hash == NULL) {
return NULL;
}
snprintf(encoded_hash, max_encoded_size, "argon2id13-%zu-%zu-%s", opslimit, memlimit, hex_hash);
return encoded_hash;
}