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/*
* Worldvisions Tunnel Vision Software:
* Copyright (C) 1997-2003 Net Integration Technologies, Inc.
*
* TripleDES cryptography abstractions.
*/
#include "wvtripledes.h"
#include <assert.h>
#include <openssl/rand.h>
/***** WvTripleDESEncoder ****/
WvTripleDESEncoder::WvTripleDESEncoder(Mode _mode, const void *_key1,
const void *_key2, const void *_key3) :
mode(_mode)
{
setkey(_key1, _key2, _key3);
}
// WvTripleDESEncoder::~WvTripleDESEncoder()
// {
// delete[] key;
// delete deskey1;
// delete deskey2;
// delete deskey3;
// }
bool WvTripleDESEncoder::_reset()
{
memset(ivec, 0, sizeof(ivec));
ivecoff = 0;
return true;
}
void WvTripleDESEncoder::setkey(const void *_key1, const void *_key2,
const void *_key3)
{
memcpy(key, _key1, DES_KEY_SZ);
DES_set_key(&key, &deskey1);
memcpy(key, _key2, DES_KEY_SZ);
DES_set_key(&key, &deskey2);
memcpy(key, _key3, DES_KEY_SZ);
DES_set_key(&key, &deskey3);
memset(ivec, 0, sizeof(ivec));
ivecoff = 0;
}
void WvTripleDESEncoder::setiv(const void *_iv)
{
memcpy(ivec, _iv, sizeof(ivec));
ivecoff = 0;
}
bool WvTripleDESEncoder::_encode(WvBuf &in, WvBuf &out, bool flush)
{
size_t len = in.used();
bool success = true;
switch (mode) {
case ECBEncrypt:
case ECBDecrypt:
case CBCEncrypt: // The caller should ensure the padding is correct or
case CBCDecrypt: // we do it for them, in probably the wrong way.
{
size_t remainder = len & 7; // conviently this is the same as len % 8
len -= remainder;
if (remainder != 0 && flush)
{
if (mode == ECBEncrypt || mode == CBCEncrypt)
{
// if flushing on encryption, add some randomized padding
size_t padlen = 8 - remainder;
unsigned char *pad = in.alloc(padlen);
RAND_pseudo_bytes(pad, padlen);
len += 8;
}
else // nothing we can do here, flushing does not make sense!
success = false;
}
}
default:
break;
}
if (len == 0)
return success;
const unsigned char *data = in.get(len);
unsigned char *crypt = out.alloc(len);
switch (mode)
{
case ECBEncrypt:
case ECBDecrypt:
// ECB works 64bits at a time
while (len >= 8)
{
#if OPENSSL_VERSION_NUMBER >= 0x0090705fL \
&& OPENSSL_VERSION_NUMBER < 0x0090800fL
DES_ecb3_encrypt(data, crypt,
&deskey1, &deskey2, &deskey3,
mode == ECBEncrypt ? DES_ENCRYPT : DES_DECRYPT);
#else
DES_ecb3_encrypt(reinterpret_cast<const_DES_cblock*>(&data),
reinterpret_cast<DES_cblock*>(&crypt),
&deskey1, &deskey2, &deskey3,
mode == ECBEncrypt ? DES_ENCRYPT : DES_DECRYPT);
#endif
len -= 8;
data += 8;
crypt += 8;
}
break;
case CFBEncrypt:
case CFBDecrypt:
// CFB simulates a stream
DES_ede3_cfb64_encrypt(data, crypt, len, &deskey1, &deskey2, &deskey3,
&ivec, &ivecoff,
mode == CFBEncrypt ? DES_ENCRYPT : DES_DECRYPT);
break;
case CBCEncrypt:
DES_ede3_cbc_encrypt(data, crypt, len, &deskey1, &deskey2, &deskey3,
&ivec, DES_ENCRYPT);
break;
case CBCDecrypt:
DES_ede3_cbc_encrypt(data, crypt, len, &deskey1, &deskey2, &deskey3,
&ivec, DES_DECRYPT);
break;
}
return success;
}
/***** WvTripleDESStream *****/
WvTripleDESStream::WvTripleDESStream(WvStream *_cloned, const void *_key1,
const void *_key2, const void *_key3,
WvTripleDESEncoder::Mode readmode,
WvTripleDESEncoder::Mode writemode) :
WvEncoderStream(_cloned)
{
readchain.append(new WvTripleDESEncoder(readmode,
_key1, _key2, _key3), true);
writechain.append(new WvTripleDESEncoder(writemode,
_key1, _key2, _key3), true);
}
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