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/*
* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Base64.h>
#include <AK/Types.h>
#include <LibCrypto/Hash/SHA2.h>
#include <crypt.h>
#include <errno.h>
#include <string.h>
extern "C" {
static struct crypt_data crypt_data;
char* crypt(const char* key, const char* salt)
{
crypt_data.initialized = true;
return crypt_r(key, salt, &crypt_data);
}
static constexpr size_t crypt_salt_max = 16;
static constexpr size_t sha_string_length = 44;
char* crypt_r(const char* key, const char* salt, struct crypt_data* data)
{
if (!data->initialized) {
errno = EINVAL;
return nullptr;
}
if (salt[0] == '$') {
if (salt[1] == '5') {
const char* salt_value = salt + 3;
size_t salt_len = min(strcspn(salt_value, "$"), crypt_salt_max);
size_t header_len = salt_len + 3;
bool fits = String(salt, header_len).copy_characters_to_buffer(data->result, sizeof(data->result));
if (!fits) {
errno = EINVAL;
return nullptr;
}
data->result[header_len] = '$';
Crypto::Hash::SHA256 sha;
sha.update(key);
sha.update((const u8*)salt_value, salt_len);
auto digest = sha.digest();
auto string = encode_base64(ReadonlyBytes(digest.immutable_data(), digest.data_length()));
fits = string.copy_characters_to_buffer(data->result + header_len + 1, sizeof(data->result) - header_len - 1);
if (!fits) {
errno = EINVAL;
return nullptr;
}
return data->result;
}
}
// DES crypt is not available.
errno = EINVAL;
return nullptr;
}
}
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