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Diffstat (limited to 'kwallet/backend/blowfish.cc')
| -rw-r--r-- | kwallet/backend/blowfish.cc | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/kwallet/backend/blowfish.cc b/kwallet/backend/blowfish.cc deleted file mode 100644 index c708935de..000000000 --- a/kwallet/backend/blowfish.cc +++ /dev/null @@ -1,259 +0,0 @@ -/* This file is part of the KDE project - Copyright (C) 2001 George Staikos <[email protected]> - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later version. - - This library 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 - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public License - along with this library; see the file COPYING.LIB. If not, write to - the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. -*/ - - -// FIXME: should we unroll some loops? Optimization can be done here. - - -/* Implementation of 16 rounds blowfish as described in: - * _Applied_Cryptography_ (c) Bruce Schneier, 1996. - */ - -#include <config.h> - -#include <stdlib.h> -#include <stdio.h> -#include <string.h> - -#include "blowfish.h" -#include "blowfishtables.h" - - -BlowFish::BlowFish() { - _blksz = 8; - _key = 0L; - _init = false; -} - - - -bool BlowFish::init() { - // Initialize the sboxes - for (int i = 0; i < 256; i++) { - _S[0][i] = ks0[i]; - _S[1][i] = ks1[i]; - _S[2][i] = ks2[i]; - _S[3][i] = ks3[i]; - } - - uint32_t datal = 0; - uint32_t datar = 0; - uint32_t data = 0; - int j = 0; - - - // Update the sboxes and pbox. - for (int i = 0; i < 18; i++) { - data = 0; - for (int k = 0; k < 4; ++k) { - data = (data << 8) | ((unsigned char *)_key)[j++]; - if (j >= _keylen / 8) { - j = 0; - } - } - _P[i] = P[i] ^ data; - } - - for (int i = 0; i < 18; i += 2) { - encipher(&datal, &datar); - _P[i] = datal; - _P[i+1] = datar; - } - - for (int j = 0; j < 4; j++) { - for (int i = 0; i < 256; i += 2) { - encipher(&datal, &datar); - _S[j][i] = datal; - _S[j][i+1] = datar; - } - } - - // Nice code from gpg's implementation... - // check to see if the key is weak and return error if so - for (int i = 0; i < 255; i++) { - for (int j = i + 1; j < 256; j++) { - if ((_S[0][i] == _S[0][j]) || (_S[1][i] == _S[1][j]) || - (_S[2][i] == _S[2][j]) || (_S[3][i] == _S[3][j])) { - return false; - } - } - } - - _init = true; - - return true; -} - - -BlowFish::~BlowFish() { - delete[] (unsigned char *)_key; - _key = 0L; -} - - -int BlowFish::keyLen() const { - return 448; -} - - -bool BlowFish::variableKeyLen() const { - return true; -} - - -bool BlowFish::readyToGo() const { - return _init; -} - - -bool BlowFish::setKey(void *key, int bitlength) { - if (bitlength <= 0 || bitlength > 448 || bitlength % 8 != 0) { - return false; - } - - delete[] (unsigned char *)_key; - - _key = new unsigned char[bitlength / 8]; - memcpy(_key, key, bitlength / 8); - _keylen = bitlength; - - return init(); -} - - -#ifdef WORDS_BIGENDIAN -#define shuffle(x) do { \ - uint32_t r = x; \ - x = (r & 0xff000000) >> 24; \ - x |= (r & 0x00ff0000) >> 8; \ - x |= (r & 0x0000ff00) << 8; \ - x |= (r & 0x000000ff) << 24; \ - } while (0) -#endif - -int BlowFish::encrypt(void *block, int len) { - uint32_t *d = (uint32_t *)block; - - if (!_init || len % _blksz != 0) { - return -1; - } - - for (int i = 0; i < len / _blksz; i++) { -#ifdef WORDS_BIGENDIAN - shuffle(*d); - shuffle(*(d + 1)); -#endif - encipher(d, d + 1); -#ifdef WORDS_BIGENDIAN - shuffle(*d); - shuffle(*(d + 1)); -#endif - d += 2; - } - - return len; -} - - -int BlowFish::decrypt(void *block, int len) { - uint32_t *d = (uint32_t *)block; - - if (!_init || len % _blksz != 0) { - return -1; - } - - for (int i = 0; i < len / _blksz; i++) { -#ifdef WORDS_BIGENDIAN - shuffle(*d); - shuffle(*(d + 1)); -#endif - decipher(d, d + 1); -#ifdef WORDS_BIGENDIAN - shuffle(*d); - shuffle(*(d + 1)); -#endif - d += 2; - } - - return len; -} - - -uint32_t BlowFish::F(uint32_t x) { - unsigned short a, b, c, d; - uint32_t y; - - d = x & 0x000000ff; - x >>= 8; - c = x & 0x000000ff; - x >>= 8; - b = x & 0x000000ff; - x >>= 8; - a = x & 0x000000ff; - - y = _S[0][a] + _S[1][b]; - y ^= _S[2][c]; - y += _S[3][d]; - - return y; -} - - -void BlowFish::encipher(uint32_t *xl, uint32_t *xr) { - uint32_t Xl = *xl, Xr = *xr, temp; - - for (int i = 0; i < 16; ++i) { - Xl ^= _P[i]; - Xr ^= F(Xl); - // Exchange - temp = Xl; Xl = Xr; Xr = temp; - } - - // Exchange - temp = Xl; Xl = Xr; Xr = temp; - - Xr ^= _P[16]; - Xl ^= _P[17]; - - *xl = Xl; - *xr = Xr; -} - - -void BlowFish::decipher(uint32_t *xl, uint32_t *xr) { - uint32_t Xl = *xl, Xr = *xr, temp; - - for (int i = 17; i > 1; --i) { - Xl ^= _P[i]; - Xr ^= F(Xl); - // Exchange - temp = Xl; Xl = Xr; Xr = temp; - } - - // Exchange - temp = Xl; Xl = Xr; Xr = temp; - - Xr ^= _P[1]; - Xl ^= _P[0]; - - *xl = Xl; - *xr = Xr; -} - - |