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simpleqtcryptor.cpp
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/*
* SimpleQtCryptor is an encryption library for Qt.
*
* Copyright (C) 2010 Gunnar Thorburn
*
* SimpleQtRC5 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 3 of the License, or
* (at your option) any later version.
*
* ParrotShare 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, see <http://www.gnu.org/licenses/>.
*/
#include "simpleqtcryptor.h"
#include <boost/predef.h>
#include <boost/uuid/sha1.hpp>
#include <chrono>
#ifdef WITH_SERPENT_INCLUDE_FAST_SBOX
#include "serpent_sbox.h"
#endif
#define ROUNDS 32
#define KEYSIZE_RC5 20
#define KEYSIZE_SERPENT 32
#define SSIZE_RC5 66
#define SSIZE_SERPENT 132
#define P32 0xb7e17163
#define Q32 0x9e3779b9
#define P64 0xb7e151628aed2a6b;
#define Q64 0x9e3779b97f4a7c15;
#define ROTL32(x, y) (((x) << (y)) | ((x) >> (32 - (y))))
#define ROTR32(x, y) (((x) >> (y)) | ((x) << (32 - (y))))
#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
#define ROTR64(x, y) (((x) >> (y)) | ((x) << (64 - (y))))
#if BOOST_ENDIAN_BIG_BYTE
template <class T>
T qFromLittleEndian(const void *src) {
T ret = reinterpret_cast<T>(*src);
if (sizeof(T) == 4) {
ret = reinterpret_cast<T>(__bswap_32(reinterpret_cast<unsigned int> ret));
} else if (sizeof(T) == 8) {
ret = reinterpret_cast<T>(__bswap_64(reinterpret_cast<uint64_t> ret));
}
return ret;
}
template <class T>
void qToLittleEndian(T value, void *dest) {
if (sizeof(T) == 4) {
value = reinterpret_cast<T>(__bswap_32(reinterpret_cast<unsigned int> value));
}
else if (sizeof(T) == 8) {
value = reinterpret_cast<T>(__bswap_64(reinterpret_cast<uint64_t> value));
}
*reinterpret_cast<T*>(dest) = value;
}
#elif BOOST_ENDIAN_LITTLE_BYTE
template <class T>
T qFromLittleEndian(const void *src) {
T ret = *reinterpret_cast<const T*>(src);
return ret;
}
template <class T>
void qToLittleEndian(T value, void *dest) {
*reinterpret_cast<T*>(dest) = value;
}
#else
#error("Endianess could not be detected")
#endif
namespace SimpleQtCryptor {
#ifdef WITHRC5
std::vector<uint8_t> header_RC5_32_32_20 = {'R', 'C', '5', '/', '3', '2', '/',
'3', '2', '/', '2', '0', ':'};
std::vector<uint8_t> header_RC5_64_32_20 = {'R', 'C', '5', '/', '6', '4', '/',
'3', '2', '/', '2', '0', ':'};
#endif
std::vector<uint8_t> header_SERPENT_32 = {'S', 'E', 'R', 'P', 'E', 'N',
'T', '/', '3', '2', ':'};
std::vector<uint8_t> header_CBC = {'C', 'B', 'C', ':', 'P',
'A', 'D', 'N', ':', ':'};
std::vector<uint8_t> header_CFB = {'C', 'F', 'B', ':', ':'};
#ifdef WITH_SERPENT_FAST_SBOX
inline uint32_t serpent_sbox_fast(int sbox, uint32_t X);
#else
void serpent_sbox_it(int sbox, uint32_t &X1, uint32_t &X2, uint32_t &X3,
uint32_t &X4);
#endif
#ifdef WITHRC5
Algorithm Info::fastRC5() {
#if (QT_POINTER_SIZE == 4)
return RC5_32_32_20;
#else
return RC5_64_32_20;
#endif
}
#endif
std::string Info::errorText(Error e) {
switch (e) {
case NoError:
return std::string("NoError");
case ErrorNoAlgorithm:
return std::string("ErrorNoAlgorithm");
case ErrorNoMode:
return std::string("ErrorNoMode");
case ErrorInvalidKey:
return std::string("ErrorInvalidKey");
case ErrorNotEnoughData:
return std::string("ErrorNotEnoughData");
case ErrorModeNotImplemented:
return std::string("ErrorModeNotImplemented");
case ErrorAlgorithmNotImplemented:
return std::string("ErrorAlgorithmNotImplemented");
case ErrorChecksumNotImplemented:
return std::string("ErrorChecksumNotImplemented");
case ErrorAlreadyError:
return std::string("ErrorAlreadyError");
default:
return std::string("UnknownError");
}
return std::string();
}
Key::Key() {
#ifdef WITHRC5
s32 = 0;
s64 = 0;
#endif
serpent = 0;
}
Key::Key(const std::vector<uint8_t> &k) {
key = k;
#ifdef WITHRC5
s32 = 0;
s64 = 0;
#endif
serpent = 0;
}
Key::Key(const std::string &k) {
boost::uuids::detail::sha1 qch;
qch.process_bytes(k.c_str(), k.size());
key.resize(20);
unsigned digest[5] = {0};
qch.get_digest(digest);
for (int i = 0; i < 5; ++i) {
key[4 * i + 0] = (digest[i] & 0xFF000000) >> 24;
key[4 * i + 1] = (digest[i] & 0x00FF0000) >> 16;
key[4 * i + 2] = (digest[i] & 0x0000FF00) >> 8;
key[4 * i + 3] = (digest[i] & 0x000000FF) >> 0;
}
#ifdef WITHRC5
s32 = 0;
s64 = 0;
#endif
serpent = 0;
}
Key::~Key() {
#ifdef WITHRC5
delete[] s32;
delete[] s64;
#endif
delete serpent;
}
std::vector<uint8_t> Key::resizeKey(int ks) {
std::vector<uint8_t> newKey(ks, 0);
unsigned char *ok = (unsigned char *)(key.data());
unsigned char *nk = (unsigned char *)(newKey.data());
for (int i = 0; i < key.size(); i++) {
nk[i % ks] ^= ok[i];
}
return newKey;
}
#ifdef WITHRC5
void Key::expandKeyRc532() {
if (s32) return;
if (KEYSIZE_RC5 != keyRc5.size()) {
keyRc5 = resizeKey(KEYSIZE_RC5);
}
s32 = new uint32_t[SSIZE_RC5];
uint32_t *s = s32;
unsigned char *k = (unsigned char *)(keyRc5.data());
uint32_t L[5];
L[0] = qFromLittleEndian<uint32_t>(k);
L[1] = qFromLittleEndian<uint32_t>(k + 4);
L[2] = qFromLittleEndian<uint32_t>(k + 8);
L[3] = qFromLittleEndian<uint32_t>(k + 12);
L[4] = qFromLittleEndian<uint32_t>(k + 16);
s[0] = P32;
for (int i = 1; i < SSIZE_RC5; i++) {
s[i] = s[i - 1] + Q32;
}
int i = 0, j = 0;
uint32_t A = 0, B = 0;
for (int x = 0; x < ROUNDS; x++) {
A = s[i] = ROTL32(s[i] + (A + B), 3);
B = L[j] = ROTL32(L[j] + (A + B), (A + B) & 31);
i = (i + 1) % SSIZE_RC5;
j = (j + 1) % 5;
}
}
#endif
#ifdef WITHRC5
// TODO
void Key::expandKeyRc564() {
if (s64) return;
if (KEYSIZE_RC5 != keyRc5.size()) {
keyRc5 = resizeKey(KEYSIZE_RC5);
}
s64 = new uint64_t[SSIZE_RC5];
uint64_t *s = s64;
unsigned char *k = (unsigned char *)(keyRc5.data());
uint64_t L[3];
L[0] = qFromLittleEndian<uint64_t>(k);
L[1] = qFromLittleEndian<uint64_t>(k + 8);
L[2] = qFromLittleEndian<uint32_t>(k + 16);
s[0] = P64;
for (int i = 1; i < SSIZE_RC5; i++) {
s[i] = s[i - 1] + Q64;
}
int i = 0, j = 0;
uint64_t A = 0, B = 0;
for (int x = 0; x < ROUNDS; x++) {
A = s[i] = ROTL64(s[i] + (A + B), 3);
B = L[j] = ROTL64(L[j] + (A + B), (A + B) & 63);
i = (i + 1) % SSIZE_RC5;
j = (j + 1) % 3;
}
}
#endif
void Key::expandKeySerpent() {
uint32_t i;
uint32_t tmp;
uint32_t *s;
if (serpent) return;
if (KEYSIZE_SERPENT != keySerpent.size()) {
keySerpent = resizeKey(KEYSIZE_SERPENT);
}
serpent = new uint32_t[SSIZE_SERPENT];
s = new uint32_t[SSIZE_SERPENT + 8];
unsigned char *k = (unsigned char *)(keySerpent.data());
for (i = 0; i < 8; i++) {
s[i] = qFromLittleEndian<uint32_t>(k + 4 * i);
}
for (i = 8; i < SSIZE_SERPENT + 8; i++) {
tmp = (s[i - 8] ^ s[i - 5] ^ s[i - 3] ^ s[i - 1] ^ Q32 ^ (i - 8));
serpent[i - 8] = s[i] = ROTL32(tmp, 11);
}
for (i = 0; i < 33; i++) {
#ifdef WITH_SERPENT_FAST_SBOX
tmp = (35 - i) % 8;
for (int j = 0; j < 4; j++) {
serpent[4 * i + j] = serpent_sbox_fast(tmp, serpent[4 * i + j]);
}
#else
serpent_sbox_it((35 - i) % 8, serpent[4 * i], serpent[4 * i + 1],
serpent[4 * i + 2], serpent[4 * i + 3]);
#endif
}
delete s;
}
/* *** ENCRYPTOR *** */
Encryptor::Encryptor(std::shared_ptr<Key> k, Algorithm a, Mode m, Checksum c) {
key = k;
algorithm = a;
mode = m;
checksum = c;
#ifdef WITHRC5
if (algorithm == RC5_FAST_32_20) {
algorithm = Info::fastRC5();
}
#endif
state = StateReset;
modex = 0;
}
Encryptor::~Encryptor() { delete modex; }
Error Encryptor::encrypt(const std::vector<uint8_t> &plain,
std::vector<uint8_t> &cipher, bool end) {
std::vector<uint8_t> tmpIn;
switch (state) {
case StateReset:
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20:
tmpIn.insert(std::end(tmpIn), std::begin(header_RC5_32_32_20),
std::end(header_RC5_32_32_20));
break;
case RC5_64_32_20:
tmpIn.insert(std::end(tmpIn), std::begin(header_RC5_64_32_20),
std::end(header_RC5_64_32_20));
break;
#endif
case SERPENT_32:
tmpIn.insert(std::end(tmpIn), std::begin(header_SERPENT_32),
std::end(header_SERPENT_32));
break;
case NoAlgorithm:
case DetectAlgorithm:
#ifdef WITHRC5
case RC5_FAST_32_20:
#endif
state = StateError;
return ErrorNoAlgorithm;
}
switch (mode) {
case ModeCBC:
tmpIn.insert(std::end(tmpIn), std::begin(header_CBC),
std::end(header_CBC));
if (0 == modex) modex = new CBC(key, algorithm);
break;
case ModeCFB:
tmpIn.insert(std::end(tmpIn), std::begin(header_CFB),
std::end(header_CFB));
if (0 == modex) modex = new CFB(key, algorithm);
break;
case NoMode:
case DetectMode:
default:
state = StateError;
return ErrorNoMode;
}
if (checksum != NoChecksum) {
state = StateError;
return ErrorChecksumNotImplemented;
}
// switch (checksum) HERE
state = StateOn;
case StateOn:
tmpIn.insert(std::end(tmpIn), std::begin(plain), std::end(plain));
cipher = modex->encrypt(tmpIn, end);
break;
case StateError:
default:
return ErrorAlreadyError;
}
if (end) {
state = StateReset;
}
return NoError;
}
/* *** DECRYPTOR *** */
Decryptor::Decryptor(std::shared_ptr<Key> k, Algorithm a, Mode m) {
key = k;
algorithm = a;
mode = m;
state = StateReset;
checksum = NoChecksum;
modex = 0;
}
Decryptor::~Decryptor() { delete modex; }
Checksum Decryptor::getChecksumType() { return checksum; }
Error Decryptor::decrypt(const std::vector<uint8_t> &cipher,
std::vector<uint8_t> &plain, bool end) {
std::vector<uint8_t> expectHeader;
std::vector<uint8_t> remainingFromHeader;
std::vector<uint8_t> tmpIn;
std::vector<uint8_t> tmpOut;
int neededForHeader = -1;
int neededForIv = -1;
switch (state) {
case StateReset:
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20:
expectHeader.insert(std::end(expectHeader),
std::begin(header_RC5_32_32_20),
std::end(header_RC5_32_32_20));
neededForIv = 8;
break;
case RC5_64_32_20:
expectHeader.insert(std::end(expectHeader),
std::begin(header_RC5_64_32_20),
std::end(header_RC5_64_32_20));
neededForIv = 16;
break;
#endif
case SERPENT_32:
expectHeader.insert(std::end(expectHeader),
std::begin(header_SERPENT_32),
std::end(header_SERPENT_32));
neededForIv = 16;
break;
case NoAlgorithm:
case DetectAlgorithm:
#ifdef WITHRC5
case RC5_FAST_32_20:
#endif
state = StateError;
return ErrorNoAlgorithm;
}
switch (mode) {
case ModeCBC:
expectHeader.insert(std::end(expectHeader), std::begin(header_CBC),
std::end(header_CBC));
neededForHeader =
(((neededForIv + expectHeader.size() - 1) / neededForIv) + 1) *
neededForIv;
if (0 == modex) modex = new CBC(key, algorithm);
break;
case ModeCFB:
expectHeader.insert(std::end(expectHeader), std::begin(header_CFB),
std::end(header_CFB));
neededForHeader = neededForIv + expectHeader.size();
if (0 == modex) modex = new CFB(key, algorithm);
break;
case NoMode:
case DetectMode:
default:
state = StateError;
return ErrorNoMode;
}
if (cipher.size() < neededForHeader) {
state = StateError;
return ErrorNotEnoughData;
}
tmpOut =
modex->decrypt(std::vector<uint8_t>(cipher.begin(),
cipher.begin() + neededForHeader),
false);
if (std::equal(tmpOut.begin(), tmpOut.begin() + expectHeader.size(),
expectHeader.begin())) {
remainingFromHeader = std::vector<uint8_t>(
tmpOut.begin() + expectHeader.size(), tmpOut.end());
tmpOut.clear();
tmpIn = std::vector<uint8_t>(cipher.begin() + neededForHeader,
cipher.end());
state = StateOn;
} else {
state = StateError;
tmpOut.clear();
return ErrorInvalidKey;
}
case StateOn:
if (tmpIn.empty()) {
tmpIn = cipher;
}
tmpOut = modex->decrypt(tmpIn, end);
break;
case StateError:
default:
return ErrorAlreadyError;
}
if (!remainingFromHeader.empty()) {
tmpOut.insert(std::begin(tmpOut), std::begin(remainingFromHeader),
std::end(remainingFromHeader));
}
if (end) {
state = StateReset;
}
plain = tmpOut;
return NoError;
}
/* *** DECRYPTOR WIZARD ENTRY *** */
class DecryptorWizardEntry {
public:
std::shared_ptr<Key> key;
Algorithm alg;
Mode mode;
Checksum csum;
};
/* *** DECRYPTOR WIZARD *** */
DecryptorWizard::DecryptorWizard() {}
DecryptorWizard::DecryptorWizard(std::shared_ptr<Key> k, Algorithm a, Mode m) {
addParameters(k, a, m);
}
DecryptorWizard::~DecryptorWizard() {
for (auto entry : entries) {
delete entry;
}
}
void DecryptorWizard::addParameters(std::shared_ptr<Key> k, Algorithm a,
Mode m) {
DecryptorWizardEntry *dwe = new DecryptorWizardEntry();
dwe->key = k;
dwe->alg = a;
dwe->mode = m;
entries.push_back(dwe);
}
Error DecryptorWizard::decrypt(const std::vector<uint8_t> &cipher,
std::vector<uint8_t> &plain,
std::shared_ptr<Decryptor> &decryptor,
bool end) {
#ifdef WITHRC5
Algorithm aList[3] = {RC5_32_32_20, RC5_64_32_20, SERPENT_32};
int aL = 3;
#else
Algorithm aList[1] = {SERPENT_32};
int aL = 1;
#endif
Mode mList[2] = {ModeCBC, ModeCFB};
int mL = 2;
int eL = entries.size();
int eI, aI, mI;
Decryptor *dx;
Error dxError;
Error retError = ErrorInvalidKey;
// for (eI = 0; eI < eL; eI++)
for (auto eI = entries.begin(); eI != entries.end(); ++eI)
for (aI = 0; aI < aL; aI++)
for (mI = 0; mI < mL; mI++) {
if (((*eI)->alg != aList[aI]) && ((*eI)->alg != DetectAlgorithm))
continue;
if (((*eI)->mode != mList[mI]) && ((*eI)->mode != DetectMode)) continue;
dx = new Decryptor((*eI)->key, aList[aI], mList[mI]);
dxError = dx->decrypt(cipher, plain, end);
switch (dxError) {
case NoError:
decryptor = std::shared_ptr<Decryptor>(dx);
return NoError;
case ErrorNotEnoughData:
retError = ErrorNotEnoughData;
break;
case ErrorInvalidKey:
if (ErrorNotEnoughData != retError) {
retError = ErrorInvalidKey;
}
break;
default:
delete dx;
return dxError;
}
delete dx;
}
return retError;
}
Error DecryptorWizard::decryptToEnd(const std::vector<uint8_t> &cipher,
std::vector<uint8_t> &plain) {
std::shared_ptr<Decryptor> qspd;
Error er = decrypt(cipher, plain, qspd, true);
return er;
}
/* *** INITIALIZATION VECTOR *** */
std::vector<uint8_t> InitializationVector::getVector8() {
std::vector<uint8_t> ret(8, 0);
auto now = std::chrono::system_clock::now();
time_t tnow = std::chrono::system_clock::to_time_t(now);
tm *endOfDay = std::localtime(&tnow);
endOfDay->tm_hour = 23;
endOfDay->tm_min = 59;
endOfDay->tm_sec = 59;
auto endOfDayT =
std::chrono::system_clock::from_time_t(std::mktime(endOfDay));
auto diff_time =
std::chrono::duration_cast<std::chrono::milliseconds>(endOfDayT - now)
.count();
tnow = std::chrono::system_clock::to_time_t(now);
tm *endDate = std::localtime(&tnow);
endDate->tm_year = 2999;
endDate->tm_mon = 12;
endDate->tm_mday = 31;
auto endDateT = std::chrono::system_clock::from_time_t(std::mktime(endDate));
auto diff_date =
std::chrono::duration_cast<std::chrono::hours>(endDateT - now).count() / 24;
uint32_t A = (uint32_t)(std::rand()) ^ (uint32_t)(diff_time);
uint32_t B = (uint32_t)(std::rand()) ^ (uint32_t)(diff_date);
qToLittleEndian(A, (void *)(&ret[0]));
qToLittleEndian(B, (void *)(&ret[0] + 4));
ret[0] = ((uint8_t)(ret[0]) | 128);
return ret;
}
std::vector<uint8_t> InitializationVector::getVector16() {
std::vector<uint8_t> ret(16, 0);
auto now = std::chrono::system_clock::now();
time_t tnow = std::chrono::system_clock::to_time_t(now);
tm *endOfDay = std::localtime(&tnow);
endOfDay->tm_hour = 23;
endOfDay->tm_min = 59;
endOfDay->tm_sec = 59;
auto endOfDayT =
std::chrono::system_clock::from_time_t(std::mktime(endOfDay));
auto diff_time =
std::chrono::duration_cast<std::chrono::milliseconds>(endOfDayT - now)
.count();
tnow = std::chrono::system_clock::to_time_t(now);
tm *endDate = std::localtime(&tnow);
endDate->tm_year = 2999;
endDate->tm_mon = 12;
endDate->tm_mday = 31;
auto endDateT = std::chrono::system_clock::from_time_t(std::mktime(endDate));
auto diff_date =
std::chrono::duration_cast<std::chrono::hours>(endDateT - now).count() / 24;
uint32_t A = (uint32_t)(std::rand()) ^ (uint32_t)(diff_time);
uint32_t B = (uint32_t)(std::rand()) ^ (uint32_t)(diff_date);
uint32_t C = (uint32_t)(std::rand());
uint32_t D = (uint32_t)(std::rand());
qToLittleEndian(A, (uint8_t *)(&ret[0]));
qToLittleEndian(B, (uint8_t *)(&ret[0] + 4));
qToLittleEndian(C, (uint8_t *)(&ret[0] + 8));
qToLittleEndian(D, (uint8_t *)(&ret[0] + 12));
ret[0] = ((uint8_t)(ret[0]) | 128);
return ret;
}
void InitializationVector::initiate() {
auto now = std::chrono::system_clock::now();
time_t tnow = std::chrono::system_clock::to_time_t(now);
tm *endOfDay = std::localtime(&tnow);
endOfDay->tm_hour = 23;
endOfDay->tm_min = 59;
endOfDay->tm_sec = 59;
auto endOfDayT =
std::chrono::system_clock::from_time_t(std::mktime(endOfDay));
auto diff_time =
std::chrono::duration_cast<std::chrono::milliseconds>(endOfDayT - now)
.count();
std::srand((uint32_t)diff_time);
}
/* *** CBC *** */
CBC::CBC(std::shared_ptr<Key> k, Algorithm a) {
algorithm = a;
key = k;
reset();
}
CBC::~CBC() {}
void CBC::reset() {
worksize = -1;
buffer.clear();
cbcBuffer.clear();
padHostageBuffer.clear();
}
/*
*
* PSEUDO
*
* documentation missing
*
*/
std::vector<uint8_t> CBC::encrypt(const std::vector<uint8_t> plain, bool end) {
int cipherpos = 0;
int padsize = -1;
bool iv = false;
// set initialization vector if first data
if (-1 == worksize) {
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20:
cbcBuffer = InitializationVector::getVector8();
worksize = 8;
iv = true;
key->expandKeyRc532();
break;
case RC5_64_32_20:
cbcBuffer = InitializationVector::getVector16();
worksize = 16;
iv = true;
key->expandKeyRc564();
break;
#endif
case SERPENT_32:
cbcBuffer = InitializationVector::getVector16();
worksize = 16;
iv = true;
key->expandKeySerpent();
break;
default:
buffer.clear();
return std::vector<uint8_t>();
}
}
buffer.insert(buffer.end(), plain.begin(), plain.end());
int cipherlen = (buffer.size() / worksize) * worksize;
padsize = worksize - (buffer.size() - cipherlen);
if (iv) cipherlen += cbcBuffer.size();
if (end) cipherlen += worksize;
std::vector<uint8_t> cipher = std::vector<uint8_t>(cipherlen, 0);
if (end) {
std::vector<uint8_t> temp(padsize, (char)padsize);
buffer.insert(buffer.end(), temp.begin(), temp.end());
}
if (iv)
while (cipherpos < worksize) {
cipher[cipherpos] = cbcBuffer[cipherpos];
cipherpos++;
}
uint8_t *bufdat = (uint8_t *)buffer.data();
uint8_t *cipdat = (uint8_t *)cipher.data();
uint8_t *cbcdat = (uint8_t *)cbcBuffer.data();
int bufpos = 0;
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20: {
uint32_t cbc1 = qFromLittleEndian<uint32_t>(cbcdat);
uint32_t cbc2 = qFromLittleEndian<uint32_t>(cbcdat + 4);
uint32_t buf1;
uint32_t buf2;
while (cipherpos < cipherlen) {
buf1 = qFromLittleEndian<uint32_t>(bufdat + bufpos);
buf2 = qFromLittleEndian<uint32_t>(bufdat + bufpos + 4);
cbc1 ^= buf1;
cbc2 ^= buf2;
rc5_32_encrypt_2w(cbc1, cbc2, key->s32);
qToLittleEndian(cbc1, cipdat + cipherpos);
qToLittleEndian(cbc2, cipdat + cipherpos + 4);
cipherpos += worksize;
bufpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 4);
} break;
case RC5_64_32_20: {
uint64_t cbc1 = qFromLittleEndian<uint64_t>(cbcdat);
uint64_t cbc2 = qFromLittleEndian<uint64_t>(cbcdat + 8);
uint64_t buf1;
uint64_t buf2;
while (cipherpos < cipherlen) {
buf1 = qFromLittleEndian<uint64_t>(bufdat + bufpos);
buf2 = qFromLittleEndian<uint64_t>(bufdat + bufpos + 8);
cbc1 ^= buf1;
cbc2 ^= buf2;
rc5_64_encrypt_2w(cbc1, cbc2, key->s64);
qToLittleEndian(cbc1, cipdat + cipherpos);
qToLittleEndian(cbc2, cipdat + cipherpos + 8);
cipherpos += worksize;
bufpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 8);
} break;
#endif
case SERPENT_32: {
uint32_t cbc1 = qFromLittleEndian<uint32_t>(cbcdat);
uint32_t cbc2 = qFromLittleEndian<uint32_t>(cbcdat + 4);
uint32_t cbc3 = qFromLittleEndian<uint32_t>(cbcdat + 8);
uint32_t cbc4 = qFromLittleEndian<uint32_t>(cbcdat + 12);
uint32_t buf1;
uint32_t buf2;
uint32_t buf3;
uint32_t buf4;
while (cipherpos < cipherlen) {
buf1 = qFromLittleEndian<uint64_t>(bufdat + bufpos);
buf2 = qFromLittleEndian<uint64_t>(bufdat + bufpos + 4);
buf3 = qFromLittleEndian<uint64_t>(bufdat + bufpos + 8);
buf4 = qFromLittleEndian<uint64_t>(bufdat + bufpos + 12);
cbc1 ^= buf1;
cbc2 ^= buf2;
cbc3 ^= buf3;
cbc4 ^= buf4;
serpent_encrypt_4w(cbc1, cbc2, cbc3, cbc4, key->serpent);
qToLittleEndian(cbc1, cipdat + cipherpos);
qToLittleEndian(cbc2, cipdat + cipherpos + 4);
qToLittleEndian(cbc3, cipdat + cipherpos + 8);
qToLittleEndian(cbc4, cipdat + cipherpos + 12);
cipherpos += worksize;
bufpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 4);
qToLittleEndian(cbc3, cbcdat + 8);
qToLittleEndian(cbc4, cbcdat + 12);
} break;
default:
cipher.clear();
return cipher;
}
if (end) {
reset();
} else {
buffer = std::vector<uint8_t>(buffer.begin() + bufpos, buffer.end());
}
return cipher;
}
std::vector<uint8_t> CBC::decrypt(const std::vector<uint8_t> cipher, bool end) {
int bufferpos = 0;
int plainpos = 0;
buffer.insert(buffer.end(), cipher.begin(), cipher.end());
if (-1 == worksize) {
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20:
if (buffer.size() < 8) return std::vector<uint8_t>();
cbcBuffer = std::vector<uint8_t>(buffer.begin(), buffer.begin() + 8);
worksize = 8;
bufferpos = 8;
key->expandKeyRc532();
break;
case RC5_64_32_20:
if (buffer.size() < 16) return std::vector<uint8_t>();
cbcBuffer = std::vector<uint8_t>(buffer.begin(), buffer.begin() + 16);
worksize = 16;
bufferpos = 16;
key->expandKeyRc564();
break;
#endif
case SERPENT_32:
if (buffer.size() < 16) return std::vector<uint8_t>();
cbcBuffer = std::vector<uint8_t>(buffer.begin(), buffer.begin() + 16);
worksize = 16;
bufferpos = 16;
key->expandKeySerpent();
break;
default:
buffer.clear();
return std::vector<uint8_t>();
}
}
int plainlen = ((buffer.size() - bufferpos) / worksize) * worksize +
padHostageBuffer.size();
std::vector<uint8_t> plain(plainlen, 0);
while (plainpos < padHostageBuffer.size()) {
plain[plainpos] = padHostageBuffer[plainpos];
plainpos++;
}
padHostageBuffer.clear();
uint8_t *bufdat = (uint8_t *)buffer.data();
uint8_t *plndat = (uint8_t *)plain.data();
uint8_t *cbcdat = (uint8_t *)cbcBuffer.data();
switch (algorithm) {
#ifdef WITHRC5
case RC5_32_32_20: {
uint32_t cbc1 = qFromLittleEndian<uint32_t>(cbcdat);
uint32_t cbc2 = qFromLittleEndian<uint32_t>(cbcdat + 4);
uint32_t buf1;
uint32_t buf2;
uint32_t pln1;
uint32_t pln2;
while (plainpos < plainlen) {
pln1 = buf1 = qFromLittleEndian<uint32_t>(bufdat + bufferpos);
pln2 = buf2 = qFromLittleEndian<uint32_t>(bufdat + bufferpos + 4);
rc5_32_decrypt_2w(pln1, pln2, key->s32);
qToLittleEndian((pln1 ^ cbc1), plndat + plainpos);
qToLittleEndian((pln2 ^ cbc2), plndat + plainpos + 4);
cbc1 = buf1;
cbc2 = buf2;
plainpos += worksize;
bufferpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 4);
} break;
case RC5_64_32_20: {
uint64_t cbc1 = qFromLittleEndian<uint64_t>(cbcdat);
uint64_t cbc2 = qFromLittleEndian<uint64_t>(cbcdat + 8);
uint64_t buf1;
uint64_t buf2;
uint64_t pln1;
uint64_t pln2;
while (plainpos < plainlen) {
pln1 = buf1 = qFromLittleEndian<uint64_t>(bufdat + bufferpos);
pln2 = buf2 = qFromLittleEndian<uint64_t>(bufdat + bufferpos + 8);
rc5_64_decrypt_2w(pln1, pln2, key->s64);
qToLittleEndian((pln1 ^ cbc1), plndat + plainpos);
qToLittleEndian((pln2 ^ cbc2), plndat + plainpos + 8);
cbc1 = buf1;
cbc2 = buf2;
plainpos += worksize;
bufferpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 8);
} break;
#endif
case SERPENT_32: {
uint32_t cbc1 = qFromLittleEndian<uint32_t>(cbcdat);
uint32_t cbc2 = qFromLittleEndian<uint32_t>(cbcdat + 4);
uint32_t cbc3 = qFromLittleEndian<uint32_t>(cbcdat + 8);
uint32_t cbc4 = qFromLittleEndian<uint32_t>(cbcdat + 12);
uint32_t buf1;
uint32_t buf2;
uint32_t buf3;
uint32_t buf4;
uint32_t pln1;
uint32_t pln2;
uint32_t pln3;
uint32_t pln4;
while (plainpos < plainlen) {
pln1 = buf1 = qFromLittleEndian<uint32_t>(bufdat + bufferpos);
pln2 = buf2 = qFromLittleEndian<uint32_t>(bufdat + bufferpos + 4);
pln3 = buf3 = qFromLittleEndian<uint32_t>(bufdat + bufferpos + 8);
pln4 = buf4 = qFromLittleEndian<uint32_t>(bufdat + bufferpos + 12);
serpent_decrypt_4w(pln1, pln2, pln3, pln4, key->serpent);
qToLittleEndian((pln1 ^ cbc1), plndat + plainpos);
qToLittleEndian((pln2 ^ cbc2), plndat + plainpos + 4);
qToLittleEndian((pln3 ^ cbc3), plndat + plainpos + 8);
qToLittleEndian((pln4 ^ cbc4), plndat + plainpos + 12);
cbc1 = buf1;
cbc2 = buf2;
cbc3 = buf3;
cbc4 = buf4;
plainpos += worksize;
bufferpos += worksize;
}
qToLittleEndian(cbc1, cbcdat);
qToLittleEndian(cbc2, cbcdat + 4);
qToLittleEndian(cbc3, cbcdat + 8);
qToLittleEndian(cbc4, cbcdat + 12);
} break;
default:
plain.clear();
return plain;
}
if (end) {
// in case we dont have any valid padding, the only explanation
// is a transmission error, or someone modified the file
// however, this is not the layer where to discover such problems
// and I have nowhere to report a problem, so I just need
// to avoid crashing