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/*
Miranda NG: the free IM client for Microsoft* Windows*
Copyright (C) 2012-16 Miranda NG project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "stdafx.h"
#include "..\..\..\libs\zlib\src\zlib.h"
struct ExternalKey
{
BYTE m_key[KEY_LENGTH];
DWORD m_crc32;
BYTE slack[BLOCK_SIZE - sizeof(DWORD)];
};
CCrypt::CCrypt() :
m_password("Miranda")
{}
CCrypt::~CCrypt()
{
if (m_valid)
{
free_ecb(m_ctx);
getRandomBytes(m_key, KEY_LENGTH);
}
}
void CCrypt::destroy()
{
delete this;
}
size_t CCrypt::getKeyLength()
{
return sizeof(ExternalKey);
}
bool CCrypt::getKey(BYTE *pKey, size_t cbKeyLen)
{
if (!m_valid || cbKeyLen < sizeof(ExternalKey))
return false;
ExternalKey tmp = { 0 };
memcpy(&tmp.m_key, m_key, KEY_LENGTH);
tmp.m_crc32 = crc32(0xAbbaDead, (LPCBYTE)m_password.GetString(), m_password.GetLength());
getRandomBytes(tmp.slack, sizeof(tmp.slack));
BYTE tmpHash[32];
slow_hash(m_password, m_password.GetLength(), tmpHash);
BYTE ctx[kEcb14ContextLen];
init_ecb_14(tmpHash, ctx);
bool val = !encrypt_ecb(ctx, (BYTE*)&tmp, pKey, cbKeyLen);
free_ecb(ctx);
return val;
}
bool CCrypt::setKey(const BYTE *pKey, size_t cbKeyLen)
{
// full external key. decode & check password
if (cbKeyLen != sizeof(ExternalKey))
return false;
BYTE tmpHash[32];
slow_hash(m_password, m_password.GetLength(), tmpHash);
BYTE ctx[kEcb14ContextLen];
init_ecb_14(tmpHash, ctx);
ExternalKey tmp = { 0 };
decrypt_ecb(ctx, (BYTE*)pKey, (BYTE*)&tmp, sizeof(tmp));
free_ecb(ctx);
if (tmp.m_crc32 != crc32(0xAbbaDead, (LPCBYTE)m_password.GetString(), m_password.GetLength()))
return false;
m_valid = true;
memcpy(m_key, &tmp.m_key, KEY_LENGTH);
init_ecb_14(m_key, m_ctx);
return m_valid = true;
}
bool CCrypt::generateKey(void)
{
BYTE tmp[KEY_LENGTH];
if (!getRandomBytes(tmp, sizeof(tmp)))
return false;
memcpy(m_key, tmp, KEY_LENGTH);
init_ecb_14(m_key, m_ctx);
return m_valid = true;
}
void CCrypt::purgeKey(void)
{
memset(m_key, 0, sizeof(m_key));
m_valid = false;
}
// checks the master password (in utf-8)
bool CCrypt::checkPassword(const char *pszPassword)
{
return m_password == pszPassword;
}
// sets the master password (in utf-8)
void CCrypt::setPassword(const char *pszPassword)
{
m_password = (pszPassword == NULL) ? "Miranda" : pszPassword;
}
// result must be freed using mir_free or assigned to mir_ptr<BYTE>
BYTE* CCrypt::encodeString(const char *src, size_t *cbResultLen)
{
if (!m_valid || src == NULL) {
if (cbResultLen)
*cbResultLen = 0;
return NULL;
}
return encodeBuffer(src, mir_strlen(src)+1, cbResultLen);
}
BYTE* CCrypt::encodeBuffer(const void *src, size_t cbLen, size_t *cbResultLen)
{
if (cbResultLen)
*cbResultLen = 0;
if (!m_valid || src == NULL || cbLen >= 0xFFFE)
return NULL;
BYTE *tmpBuf = (BYTE*)_alloca(cbLen + 2);
*(PWORD)tmpBuf = (WORD)cbLen;
memcpy(tmpBuf + 2, src, cbLen);
cbLen += 2;
size_t rest = cbLen % BLOCK_SIZE;
if (rest)
cbLen += BLOCK_SIZE - rest;
BYTE *result = (BYTE*)mir_alloc(cbLen);
if (encrypt_ecb(m_ctx, tmpBuf, LPBYTE(result), cbLen)) {
mir_free(result);
return NULL;
}
if (cbResultLen)
*cbResultLen = cbLen;
return result;
}
char* CCrypt::decodeString(const BYTE *pBuf, size_t bufLen, size_t *cbResultLen)
{
size_t resLen;
char *result = (char*)decodeBuffer(pBuf, bufLen, &resLen);
if (result) {
if (result[resLen-1] != 0) { // smth went wrong
mir_free(result);
return NULL;
}
}
if (cbResultLen)
*cbResultLen = resLen;
return result;
}
void* CCrypt::decodeBuffer(const BYTE *pBuf, size_t bufLen, size_t *cbResultLen)
{
if (cbResultLen)
*cbResultLen = 0;
if (!m_valid || pBuf == NULL || (bufLen % BLOCK_SIZE) != 0)
return NULL;
char *result = (char*)mir_alloc(bufLen + 1);
if (decrypt_ecb(m_ctx, LPBYTE(pBuf), (BYTE*)result, bufLen)) {
mir_free(result);
return NULL;
}
result[bufLen] = 0;
WORD cbLen = *(PWORD)result;
if (cbLen > bufLen) {
mir_free(result);
return NULL;
}
memmove(result, result + 2, cbLen);
if (cbResultLen)
*cbResultLen = cbLen;
return result;
}
static MICryptoEngine* __cdecl builder()
{
return new CCrypt();
}
int LoadEncryptionModule(void)
{
CRYPTO_PROVIDER cp = { sizeof(cp) };
cp.pszName = "Kuznechik";
cp.pszDescr = LPGEN("Kuznechik (GOST P 34.12-2015) crypto provider");
cp.pFactory = builder;
Crypto_RegisterEngine(&cp);
return 0;
}
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