| -rw-r--r-- | pwmanager/pwmanager/rc2.cpp | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/pwmanager/pwmanager/rc2.cpp b/pwmanager/pwmanager/rc2.cpp new file mode 100644 index 0000000..3b85a3c --- a/dev/null +++ b/pwmanager/pwmanager/rc2.cpp @@ -0,0 +1,222 @@ +/*************************************************************************** + * * + * C implementation of RC2 encryption algorithm, as described in RFC2268 * + * By Matthew Palmer <mjp16@uow.edu.au> * + * * + * 2003/06/10: * + * Converted to C++ and modified to run with PwM * + * By Michael Buesch <mbuesch@freenet.de> * + * * + * 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. * + * * + ***************************************************************************/ + +/*************************************************************************** + * copyright (C) 2004 by Ulf Schenk + * This file is originaly based on version 1.0.1 of pwmanager + * and was modified to run on embedded devices that run microkde + * + * $Id$ + **************************************************************************/ + +#include "rc2.h" + +static const unsigned char +_rc2_pitable[] = { 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, + 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d, + 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e, + 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, + 0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13, + 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32, + 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, + 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82, + 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c, + 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, + 0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1, + 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26, + 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, + 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03, + 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7, + 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, + 0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7, + 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a, + 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, + 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec, + 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc, + 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, + 0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a, + 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31, + 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, + 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9, + 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c, + 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, + 0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0, + 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e, + 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, + 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad + }; + +static const int _rc2_s[] = { 1, 2, 3, 5 }; + +Rc2::Rc2() +{ +} + +Rc2::~Rc2() +{ +} + +void Rc2::rc2_expandkey(char key[], int length, int ekl) +{ + int ekl8, keymask, i; + + /* Put supplied key into first length - 1 bytes of the key buffer */ + for (i = 0; i < length; i++) { + _rc2_expkey[i] = key[i]; + } + + ekl8 = (ekl + 7) / 8; + i = _rc2_pow(2, (8 + ekl - 8 * ekl8)); + keymask = 255 % i; + + /* First expansion step */ + for (i = length; i < 128; i++) { + _rc2_expkey[i] = _rc2_pitable[(_rc2_expkey[i - 1] + _rc2_expkey[i - length]) % 256]; + } + + /* Expansion intermediate step */ + _rc2_expkey[128 - ekl8] = _rc2_pitable[_rc2_expkey[128 - ekl8] & keymask]; + + /* Third Expansion step */ + for (i = 127 - ekl8; i >= 0; i--) { + _rc2_expkey[i] = _rc2_pitable[_rc2_expkey[i + 1] ^ _rc2_expkey[i + ekl8]]; + } +} + +void Rc2::rc2_encrypt(unsigned short input[4]) +{ + int i; + + _rc2_counter = 0; + for (i = 0; i < 5; i++) { + _rc2_mix(input); + } + _rc2_mash(input); + for (i = 0; i < 6; i++) { + _rc2_mix(input); + } + _rc2_mash(input); + for (i = 0; i < 5; i++) { + _rc2_mix(input); + } +} + +void Rc2::_rc2_mix(unsigned short input[]) +{ + unsigned short K, i; + + for (i = 0; i < 4; i++) { + K = _rc2_expkey[_rc2_counter * 2] + 256 * _rc2_expkey[_rc2_counter * 2 + 1]; + input[i] = input[i] + K + (input[(i + 3) % 4] & input[(i + 2) % 4]) + ((~input[(i + 3) % 4]) & input[(i + 1) % 4]); + _rc2_counter++; + input[i] = _rc2_rol(input[i], _rc2_s[i]); + } +} + +void Rc2::_rc2_mash(unsigned short input[]) +{ + unsigned short K, i, x; + + for (i = 0; i < 4; i++) { + x = input[(i + 3) % 4] & 63; + K = _rc2_expkey[2 * x] + 256 * _rc2_expkey[2 * x + 1]; + input[i] = input[i] + K; + } +} + +void Rc2::rc2_decrypt(unsigned short input[4]) +{ + int i; + + _rc2_counter = 63; + for (i = 0; i < 5; i++) { + _rc2_rmix(input); + } + _rc2_rmash(input); + for (i = 0; i < 6; i++) { + _rc2_rmix(input); + } + _rc2_rmash(input); + for (i = 0; i < 5; i++) { + _rc2_rmix(input); + } +} + +void Rc2::_rc2_rmix(unsigned short input[]) +{ + unsigned short K; + int i; + + for (i = 3; i >= 0; i--) { + input[i] = _rc2_ror(input[i], _rc2_s[i]); + K = _rc2_expkey[_rc2_counter * 2] + 256 * _rc2_expkey[_rc2_counter * 2 + 1]; + input[i] = input[i] - K - (input[(i + 3) % 4] & input[(i + 2) % 4]) - ((~input[(i + 3) % 4]) & input[(i + 1) % 4]); + _rc2_counter--; + } +} + +void Rc2::_rc2_rmash(unsigned short input[]) +{ + unsigned short K, x; + int i; + + for (i = 3; i >= 0; i--) { + x = input[(i + 3) % 4] & 63; + K = _rc2_expkey[2 * x] + 256 * _rc2_expkey[2 * x + 1]; + input[i] = input[i] - K; + } +} +int Rc2::_rc2_pow(int base, int exponent) +{ + int i, result; + + if (exponent == 0) { + return 1; + } + result = 1; + for (i = 0; i < exponent; i++) { + result = result * base; + } + return result; +} + +unsigned short Rc2::_rc2_rol(unsigned short input, int places) +{ + unsigned short temp, i; + + for (i = 0; i < places; i++) { + temp = input & 0x8000; + input = input << 1; + if (temp) { + input++; + } + } + return input; +} + +unsigned short Rc2::_rc2_ror(unsigned short input, int places) +{ + unsigned short temp, i; + + for (i = 0; i < places; i++) { + temp = input & 0x1; + input = input >> 1; + if (temp) { + input = input + 0x8000; + } + } + return input; +} + |