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https://github.com/LadybirdBrowser/ladybird.git
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c70f45ff44
This commit moves the length calculations out to be directly on the StringView users. This is an important step towards the goal of removing StringView(char const*), as it moves the responsibility of calculating the size of the string to the user of the StringView (which will prevent naive uses causing OOB access).
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) 2020, Peter Elliott <pelliott@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 <crypt.h>
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#include <errno.h>
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#include <string.h>
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extern "C" {
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static struct crypt_data crypt_data;
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char* crypt(char const* key, char const* 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(char const* key, char const* 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] == '$') {
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if (salt[1] == '5') {
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char const* salt_value = salt + 3;
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size_t salt_len = min(strcspn(salt_value, "$"), 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(StringView { key, strlen(key) });
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sha.update((u8 const*)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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