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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* openssl/crypt rc4 crypto wrapper library
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#endif
#include "openssl/rc4.h"
#include "openssl/rand.h"
#include "openssl/rsa.h"
#include "zlib.h"
#include "GEN_messaging.h"
#include "BLO_keyStore.h"
#include "BLO_writeStreamGlue.h"
#include "BLO_en_de_cryptHeader.h"
#include "BLO_encrypt.h"
int
BLO_encrypt(
unsigned char *data,
unsigned int dataIn,
struct streamGlueHeaderStruct *streamGlueHeader)
{
int err = 0;
struct writeStreamGlueStruct *streamGlue = NULL;
struct BLO_en_de_cryptHeaderStruct BLO_en_de_cryptHeader;
RC4_KEY *rc4_key;
unsigned char *cryptBuf = NULL;
byte *pubKey, *privKey;
int pubKeyLen, privKeyLen;
int cryptKeyLen = 16;
int cryptedKeyLen;
byte cryptKey[16]; // FIXME cryptKeyLen];
RSA *rsa = NULL;
byte *cryptedKey;
static unsigned char rsa_e[] = "\x01\x00\x01";
cryptBuf = malloc(dataIn);
if (!cryptBuf) {
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETGENERR(BWS_MALLOC);
return err;
}
rc4_key = malloc(sizeof(RC4_KEY));
if (!rc4_key) {
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETGENERR(BWS_MALLOC);
free(cryptBuf);
return err;
}
#ifdef _WIN32
RAND_screen();
#endif
RAND_bytes(cryptKey, cryptKeyLen);
RC4_set_key(rc4_key, cryptKeyLen, cryptKey);
RC4(rc4_key, dataIn, data, cryptBuf);
free(rc4_key);
// Update streamGlueHeader that initiated us and write it away
streamGlueHeader->totalStreamLength =
htonl(EN_DE_CRYPTHEADERSTRUCTSIZE + dataIn);
streamGlueHeader->crc = htonl(crc32(0L,
(const Bytef *) streamGlueHeader, STREAMGLUEHEADERSIZE - 4));
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_encrypt writes streamGlueHeader of %u bytes\n",
STREAMGLUEHEADERSIZE);
#endif
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *)streamGlueHeader,
STREAMGLUEHEADERSIZE,
0);
if (err) {
free(cryptBuf);
return err;
}
pubKeyLen = keyStoreGetPubKey(&pubKey);
privKeyLen = keyStoreGetPrivKey(&privKey);
if ((pubKeyLen == 0) || (privKeyLen == 0)) {
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETGENERR(BWS_RSA);
free(cryptBuf);
return err;
}
rsa = RSA_new();
if (rsa == NULL) {
#ifndef NDEBUG
fprintf(GEN_errorstream,
"Error in RSA_new\n");
#endif
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETSPECERR(BWS_RSANEWERROR);
free(cryptBuf);
return err;
}
// static exponent
rsa->e = BN_bin2bn(rsa_e, sizeof(rsa_e)-1, rsa->e);
// public part into rsa->n
rsa->n = BN_bin2bn(pubKey, pubKeyLen, rsa->n);
// private part into rsa->d
rsa->d = BN_bin2bn(privKey, privKeyLen, rsa->d);
//DEBUG RSA_print_fp(stdout, rsa, 0);
cryptedKey = malloc(RSA_size(rsa) * sizeof(byte));
if (!cryptedKey) {
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETGENERR(BWS_MALLOC);
free(cryptBuf);
RSA_free(rsa);
return err;
}
// crypt the cryptkey
cryptedKeyLen = RSA_private_encrypt(cryptKeyLen, cryptKey, cryptedKey,
rsa, RSA_PKCS1_PADDING);
if (cryptedKeyLen == -1) {
// TODO real error handling
#ifndef NDEBUG
fprintf(GEN_errorstream,
"Error in RSA_private_encrypt\n");
#endif
err = BWS_SETFUNCTION(BWS_ENCRYPT) |
BWS_SETSPECERR(BWS_ENCRYPTERROR);
free(cryptBuf);
free(cryptedKey);
RSA_free(rsa);
return err;
}
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_encrypt writes BLO_en_de_cryptHeader of %u bytes\n",
EN_DE_CRYPTHEADERSTRUCTSIZE);
#endif
// write out our header
BLO_en_de_cryptHeader.magic = 'A';
BLO_en_de_cryptHeader.length = htonl(dataIn);
memcpy(BLO_en_de_cryptHeader.pubKey, pubKey, pubKeyLen);
BLO_en_de_cryptHeader.pubKeyLen = htonl(pubKeyLen);
memcpy(BLO_en_de_cryptHeader.cryptedKey, cryptedKey, cryptedKeyLen);
BLO_en_de_cryptHeader.cryptedKeyLen = htonl(cryptedKeyLen);
BLO_en_de_cryptHeader.datacrc = htonl(crc32(0L,
(const Bytef *) cryptBuf, dataIn));
BLO_en_de_cryptHeader.headercrc = htonl(crc32(0L,
(const Bytef *) &BLO_en_de_cryptHeader, EN_DE_CRYPTHEADERSTRUCTSIZE-4));
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *) &BLO_en_de_cryptHeader,
EN_DE_CRYPTHEADERSTRUCTSIZE,
0);
if (err) {
free(cryptBuf);
free(cryptedKey);
RSA_free(rsa);
return err;
}
#ifndef NDEBUG
fprintf(GEN_errorstream,
"BLO_encrypt writes %u bytes raw data (total %u)\n",
dataIn,
STREAMGLUEHEADERSIZE + EN_DE_CRYPTHEADERSTRUCTSIZE + dataIn);
#endif
// finally write all crypted data
err = writeStreamGlue(
Global_streamGlueControl,
&streamGlue,
(unsigned char *) cryptBuf,
dataIn,
1);
free(cryptBuf);
free(cryptedKey);
RSA_free(rsa);
return err;
}
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