mirror of
https://code.videolan.org/videolan/vlc
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82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/*****************************************************************************
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* file_crypt_win32.c: Crypt using CryptProtectData
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*****************************************************************************
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* Copyright © 2016 VLC authors, VideoLAN and VideoLabs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_keystore.h>
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#include "file_crypt.h"
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#include <windows.h>
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#include <dpapi.h>
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typedef BOOL (WINAPI *ProcessFunc)(DATA_BLOB*, LPCWSTR, DATA_BLOB*, PVOID,
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CRYPTPROTECT_PROMPTSTRUCT*, DWORD, DATA_BLOB*);
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static size_t Process(const uint8_t *p_src, size_t i_src_len, uint8_t **pp_dst, ProcessFunc pf_process)
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{
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DATA_BLOB input_blob =
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{
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.cbData = i_src_len,
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.pbData = (BYTE*)p_src
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};
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DATA_BLOB output_blob;
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if (pf_process( &input_blob, NULL, NULL, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN, &output_blob) == FALSE)
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return 0;
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*pp_dst = malloc(output_blob.cbData);
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if( unlikely( *pp_dst == NULL ) )
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{
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LocalFree( output_blob.pbData );
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return 0;
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}
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memcpy( *pp_dst, output_blob.pbData, output_blob.cbData );
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LocalFree( output_blob.pbData );
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return output_blob.cbData;
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}
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static size_t Decrypt( vlc_keystore *p_keystore, void *p_ctx, const uint8_t *p_src,
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size_t i_src_len, uint8_t ** pp_dst )
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{
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VLC_UNUSED( p_keystore );
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VLC_UNUSED( p_ctx );
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// Cast the function pointer to avoid an invalid parameter warning, regarding the "description"
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// parameter. It's LPCWSTR in the case of CryptProtectData, and LPWSTR* in the case of CryptUnprotect
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// Since we pass NULL anyway, we don't care
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return Process( p_src, i_src_len, pp_dst, (ProcessFunc)&CryptUnprotectData );
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}
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static size_t Encrypt( vlc_keystore *p_keystore, void *p_ctx, const uint8_t *p_src,
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size_t i_src_len, uint8_t ** pp_dst )
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{
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VLC_UNUSED( p_keystore );
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VLC_UNUSED( p_ctx );
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return Process( p_src, i_src_len, pp_dst, CryptProtectData );
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}
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int CryptInit(vlc_keystore *p_keystore, struct crypt *p_crypt)
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{
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VLC_UNUSED( p_keystore );
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p_crypt->pf_decrypt = Decrypt;
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p_crypt->pf_encrypt = Encrypt;
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return VLC_SUCCESS;
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}
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