mirror of
https://github.com/RGBCube/serenity
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86 lines
3 KiB
C++
86 lines
3 KiB
C++
/*
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* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Base64.h>
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#include <AK/Types.h>
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#include <LibCrypto/Hash/SHA2.h>
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#include <string.h>
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#include <unistd.h>
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extern "C" {
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static struct crypt_data crypt_data;
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char* crypt(const char* key, const char* salt)
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{
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crypt_data.initialized = true;
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return crypt_r(key, salt, &crypt_data);
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}
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static constexpr size_t crypt_salt_max = 16;
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static constexpr size_t sha_string_length = 44;
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char* crypt_r(const char* key, const char* salt, struct crypt_data* data)
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{
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if (!data->initialized) {
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errno = EINVAL;
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return nullptr;
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}
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if (salt[0] == '$') {
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if (salt[1] == '5') {
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const char* salt_value = salt + 3;
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size_t salt_len = min(strcspn(salt_value, "$"), crypt_salt_max);
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size_t header_len = salt_len + 3;
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bool fits = String(salt, header_len).copy_characters_to_buffer(data->result, sizeof(data->result));
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if (!fits) {
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errno = EINVAL;
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return nullptr;
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}
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data->result[header_len] = '$';
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Crypto::Hash::SHA256 sha;
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sha.update(key);
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sha.update((const u8*)salt_value, salt_len);
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auto digest = sha.digest();
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auto string = encode_base64(ReadonlyBytes(digest.immutable_data(), digest.data_length()));
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fits = string.copy_characters_to_buffer(data->result + header_len + 1, sizeof(data->result) - header_len - 1);
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if (!fits) {
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errno = EINVAL;
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return nullptr;
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}
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return data->result;
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}
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}
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// DES crypt is not available.
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errno = EINVAL;
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return nullptr;
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}
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}
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