mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 14:46:53 +00:00
100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
|
// blowfish.cpp - written and placed in the public domain by Wei Dai
|
||
|
|
|
||
|
|
#include "pch.h"
|
||
|
|
#include "blowfish.h"
|
||
|
|
#include "misc.h"
|
||
|
|
|
||
|
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
|
||
|
|
void Blowfish::Base::UncheckedSetKey(const byte *key_string, unsigned int keylength, const NameValuePairs &)
|
||
|
|
{
|
||
|
|
AssertValidKeyLength(keylength);
|
||
|
|
|
||
|
|
unsigned i, j=0, k;
|
||
|
|
word32 data, dspace[2] = {0, 0};
|
||
|
|
|
||
|
|
memcpy(pbox, p_init, sizeof(p_init));
|
||
|
|
memcpy(sbox, s_init, sizeof(s_init));
|
||
|
|
|
||
|
|
// Xor key string into encryption key vector
|
||
|
|
for (i=0 ; i<ROUNDS+2 ; ++i)
|
||
|
|
{
|
||
|
|
data = 0 ;
|
||
|
|
for (k=0 ; k<4 ; ++k )
|
||
|
|
data = (data << 8) | key_string[j++ % keylength];
|
||
|
|
pbox[i] ^= data;
|
||
|
|
}
|
||
|
|
|
||
|
|
crypt_block(dspace, pbox);
|
||
|
|
|
||
|
|
for (i=0; i<ROUNDS; i+=2)
|
||
|
|
crypt_block(pbox+i, pbox+i+2);
|
||
|
|
|
||
|
|
crypt_block(pbox+ROUNDS, sbox);
|
||
|
|
|
||
|
|
for (i=0; i<4*256-2; i+=2)
|
||
|
|
crypt_block(sbox+i, sbox+i+2);
|
||
|
|
|
||
|
|
if (!IsForwardTransformation())
|
||
|
|
for (i=0; i<(ROUNDS+2)/2; i++)
|
||
|
|
std::swap(pbox[i], pbox[ROUNDS+1-i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
// this version is only used to make pbox and sbox
|
||
|
|
void Blowfish::Base::crypt_block(const word32 in[2], word32 out[2]) const
|
||
|
|
{
|
||
|
|
word32 left = in[0];
|
||
|
|
word32 right = in[1];
|
||
|
|
|
||
|
|
const word32 *const s=sbox;
|
||
|
|
const word32 *p=pbox;
|
||
|
|
|
||
|
|
left ^= p[0];
|
||
|
|
|
||
|
|
for (unsigned i=0; i<ROUNDS/2; i++)
|
||
|
|
{
|
||
|
|
right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
|
||
|
|
^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
|
||
|
|
^ p[2*i+1];
|
||
|
|
|
||
|
|
left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
|
||
|
|
^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
|
||
|
|
^ p[2*i+2];
|
||
|
|
}
|
||
|
|
|
||
|
|
right ^= p[ROUNDS+1];
|
||
|
|
|
||
|
|
out[0] = right;
|
||
|
|
out[1] = left;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Blowfish::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
||
|
|
{
|
||
|
|
typedef BlockGetAndPut<word32, BigEndian> Block;
|
||
|
|
|
||
|
|
word32 left, right;
|
||
|
|
Block::Get(inBlock)(left)(right);
|
||
|
|
|
||
|
|
const word32 *const s=sbox;
|
||
|
|
const word32 *p=pbox;
|
||
|
|
|
||
|
|
left ^= p[0];
|
||
|
|
|
||
|
|
for (unsigned i=0; i<ROUNDS/2; i++)
|
||
|
|
{
|
||
|
|
right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
|
||
|
|
^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
|
||
|
|
^ p[2*i+1];
|
||
|
|
|
||
|
|
left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
|
||
|
|
^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
|
||
|
|
^ p[2*i+2];
|
||
|
|
}
|
||
|
|
|
||
|
|
right ^= p[ROUNDS+1];
|
||
|
|
|
||
|
|
Block::Put(xorBlock, outBlock)(right)(left);
|
||
|
|
}
|
||
|
|
|
||
|
|
NAMESPACE_END
|