desdecoder.cpp

funambol windows mobile plugin source code, the source code is taken from the funambol site

/*
 * Copyright (C) 2003-2007 Funambol, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY, TITLE, NONINFRINGEMENT 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 "base/util/utils.h"
#include "spds/DESDecoder.h"


DESDecoder::DESDecoder() : DataTransformer(DT_DES) {
}

DESDecoder::~DESDecoder() {
}

char* DESDecoder::transform(char* data, TransformationInfo& info)
{
    char *ret = new char[info.size];
    memcpy( ret, data, info.size*sizeof(char) );
    return ret;

/*
    TODO: implement this using openssl

    BOOL res;

    HCRYPTPROV prov = 0;
    HCRYPTKEY key = 0;

    HCRYPTHASH hash=0;

    DWORD size = info.size; // I reassign it to a DWORD
                            // just in case a long is not
                            // of the same size of a DWORD
    DWORD dwParam = 0;

    char* password = wc2utf8(info.password, NULL, 0);

    // --------------------------------------------------------

    res = CryptAcquireContext(
        &prov,             // Variable to hold returned handle.
        NULL,               // Use default key container.
        MS_ENHANCED_PROV,   // Use enhanced CSP.
        PROV_RSA_FULL,      // Type of provider to acquire.
        CRYPT_VERIFYCONTEXT
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }


    res = CryptCreateHash(
        prov,      // CSP handle
        CALG_MD5,   // hash algorith ID
        0,          // Key not used
        0,          // flags not used
        &hash      // handle to the hash object
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    // hash password
    res = CryptHashData(
        hash,                          // hash handle
        (unsigned char*) password,// pointer to the data buffer
        strlen(password),         // data length
        0                              // flags not used
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    // Derive a session key from the hash object.
    res = CryptDeriveKey (
        prov,
        CALG_DES,
        hash,
        0,
        &key
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    // set encryption mode to ECB
    dwParam=CRYPT_MODE_ECB;
    res = CryptSetKeyParam(
        key,                      // key handle
        KP_MODE,                   // set key mode flag
        (unsigned char*) &dwParam, // new mode value
        0                          // flags not used
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    // set padding mode to PKCS5
    dwParam=PKCS5_PADDING;
    res = CryptSetKeyParam(
        key,                      // key handle
        KP_PADDING,                   // set key mode flag
        (unsigned char*) &dwParam, // new mode value
        0                          // flags not used
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    res = CryptDecrypt (
        key,
        0,
        TRUE,
        0,
        (unsigned char*)data,
        &size
    );

    if (res == FALSE) {
        lastErrorCode = ERR_DT_FAILURE;
        sprintf(lastErrorMsg, ERRMSG_DT_FAILURE, GetLastError());
        goto exit;
    }

    info.size = size;
    info.newReturnedData = FALSE;

 exit:

   // Destroy the session key.
   if (key)
     CryptDestroyKey (key);

   // Destroy the hash object.
   if (hash)
     CryptDestroyHash (hash);

   // Release the provider handle.
   if (prov)
     CryptReleaseContext (prov, 0);

   if (password) {
       delete [] password;
   }

   return data;
*/
}