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DES.cpp
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DES.cpp
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#include "stdafx.h"
#include <assert.h>
#include <string.h>
#include <math.h>
#include <cmath>
#include <stdlib.h>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <exception>
#include <set>
#include <algorithm>
using std::hex;
std::ofstream TraceFile;
using std::max;
typedef unsigned long long u64;
typedef unsigned char u4;
typedef unsigned char u8;
typedef unsigned long u32;
enum LogMessages_t
{
LogFeistel = 0x01,
LogRounds = 0x02,
LogPermutations = 0x04,
};
class DES
{
private:
LogMessages_t m_ToLog;
u64 m_SubKeys[16];
public:
static u8 IPTable[64];
static u8 FPTable[64];
static u8 PermutationTable[32];
static u8 InversePermutationTable[32];
static u4 SBOX[8][64];
static u8 ExpansionTable[48];
static u8 PermutationChoice1Table[56];
static u8 PermutationChoice2Table[48];
static u8 LeftRotations[16];
void Log(LogMessages_t LogType, const char *Msg)
{
if(m_ToLog & LogType)
TraceFile << Msg << "\n";
}
void Log(LogMessages_t LogType, const char *Msg, u32 Value)
{
if(m_ToLog & LogType)
TraceFile << Msg << ": " << std::setfill('0') << std::setw(8) << hex << Value << "\n";
}
void Log(LogMessages_t LogType, const char *Msg, u64 Value)
{
if(m_ToLog & LogType)
TraceFile << Msg << ": " << std::setfill('0') << std::setw(16) << hex << Value << "\n";
}
void LogU48(LogMessages_t LogType, const char *Msg, u64 Value)
{
if(m_ToLog & LogType)
TraceFile << Msg << ": " << std::setfill('0') << std::setw(12) << hex << Value << "\n";
}
void Log(LogMessages_t LogType, const char *Msg, u8 Value)
{
if(m_ToLog & LogType)
TraceFile << Msg << ": " << std::setfill('0') << std::setw(2) << hex << (u32)Value << "\n";
}
void LogU4(LogMessages_t LogType, const char *Msg, u8 Value)
{
if(m_ToLog & LogType)
TraceFile << Msg << ": " << std::setfill('0') << std::setw(1) << hex << (u32)Value << "\n";
}
public:
DES(LogMessages_t lm) : m_ToLog(lm) {};
#define GETBIT(x,n) (((x)>>(n))&1)
#define SETBIT(o,m,b) o |= ((b)<<(m));
u64 InitialPermutation(u64 Input)
{
u64 Output = 0ULL;
for(int i = 0; i < sizeof(IPTable); ++i)
{
SETBIT(Output,i,GETBIT(Input,IPTable[i]));
}
return Output;
}
u64 FinalPermutation(u64 Input)
{
u64 Output = 0ULL;
for(int i = 0; i < sizeof(FPTable); ++i)
{
SETBIT(Output,i,GETBIT(Input,FPTable[i]));
}
return Output;
}
u64 Expand(u32 Input)
{
u64 Output = 0ULL;
for(int i = 0; i < sizeof(ExpansionTable); ++i)
{
SETBIT(Output,i,(u64)GETBIT(Input,ExpansionTable[i]));
}
return Output;
}
u32 Permute(u32 Input)
{
u32 Output = 0ULL;
for(int i = 0; i < sizeof(PermutationTable); ++i)
{
SETBIT(Output,i,GETBIT(Input,PermutationTable[i]));
}
return Output;
}
u32 PermuteInverse(u32 Input)
{
u32 Output = 0ULL;
for(int i = 0; i < sizeof(InversePermutationTable); ++i)
{
SETBIT(Output,i,GETBIT(Input,InversePermutationTable[i]));
}
return Output;
}
u64 PermutationChoice1(u64 Input)
{
u64 Output = 0ULL;
for(int i = 0; i < sizeof(PermutationChoice1Table); ++i)
{
SETBIT(Output,55-i,GETBIT(Input,63-PermutationChoice1Table[i]));
}
return Output;
}
u64 PermutationChoice2(u64 Input)
{
u64 Output = 0ULL;
for(int i = 0; i < sizeof(PermutationChoice2Table); ++i)
{
SETBIT(Output,47-i,GETBIT(Input,55-PermutationChoice2Table[i]));
}
return Output;
}
u32 RotateLeft(u32 x, u32 n, u32 numBits)
{
n %= numBits;
u32 Mask = (1 << numBits) - 1;
return ((x << n) | (x >> (numBits - n))) & Mask;
}
void GenerateSubkeys(u64 Key)
{
u64 PC1 = PermutationChoice1(Key);
u64 KeyState = PC1;
u32 KSL = (KeyState >> 28) & 0x0FFFFFFF;
u32 KSR = KeyState & 0x0FFFFFFF;
for(int i = 0; i < sizeof(LeftRotations); ++i)
{
KSL = RotateLeft(KSL, LeftRotations[i], 28);
KSR = RotateLeft(KSR, LeftRotations[i], 28);
m_SubKeys[i] = PermutationChoice2(((u64)KSL << 28) | KSR);
}
}
virtual void FeistelBegin(int round, u64 SubKey, u32 R, u32 LInverse)
{
Log(LogFeistel, "R", R);
Log(LogFeistel, "LInverse", LInverse);
LogU48(LogFeistel, "SubKey", SubKey);
}
virtual void FeistelAfterInit(int round, u64 Subkey, u32 R, u32 LInverse, u64 ExpandedR, u64 ERxorSubKey)
{
LogU48(LogFeistel, "ExpandedR", ExpandedR);
LogU48(LogFeistel, "ExpandedR ^ SubKey", ERxorSubKey);
}
// Get rid of PermutedSBIdx
virtual void FeistelAfterGroup(int round, int group, u8 SBIdx, u8 PermutedSBIdx, u4 SBOut)
{
char buf[256];
sprintf(buf, "SBIdx for bits %d-%d (group %d)", (group*6)+5,group*6, (7-group)+1);
Log(LogFeistel, buf, SBIdx);
Log(LogFeistel, "Permuted SBIdx", PermutedSBIdx);
LogU4(LogFeistel, "SBOut", SBOut);
}
virtual void FeistelEnd(int round, u32 SBoxesOut, u32 OxorLInv, u32 FinalOutput)
{
Log(LogFeistel, "SBoxes output total", SBoxesOut);
Log(LogFeistel, "Output ^ LInverse", OxorLInv);
Log(LogFeistel, "Feistel output (Permute(Output^LInverse))", FinalOutput);
}
// So I don't forget: I would like to factor this out into "events" so that I
// can derive a class off of this to capture the data that I want.
u32 Feistel(int round, u64 SubKey, u32 R, u32 LInverse)
{
FeistelBegin(round, SubKey, R, LInverse);
u64 ExpandedR = Expand(R);
u64 ERxorSubKey = ExpandedR ^ SubKey;
FeistelAfterInit(round, SubKey, R, LInverse, ExpandedR, ERxorSubKey);
u32 Output = 0;
for(int i = 7; i >= 0; --i)
{
u8 SBIdx = (ERxorSubKey >> (i*6)) & 0x3F;
u4 SBOut = SBOX[7-i][SBIdx];
Output |= SBOut << 4*i;
FeistelAfterGroup(round, i, SBIdx, SBIdx, SBOut);
}
u32 OxorLInv = Output ^ LInverse;
u32 FinalOutput = Permute(OxorLInv);
FeistelEnd(round, Output, OxorLInv, FinalOutput);
return FinalOutput;
}
void IsolatedRound(u64 SubKey, u64 Plaintext)
{
u64 State = InitialPermutation(Plaintext);
u32 L = State >> 32, R = State;
u32 LInverse = PermuteInverse(L);
u32 NewR = Feistel(1, SubKey, R, LInverse);
}
u64 EncryptBlock(u64 Key, u64 Block)
{
GenerateSubkeys(Key);
Log(LogPermutations, "Original", Block);
u64 AfterIP = InitialPermutation(Block);
Log(LogPermutations, "Initial", AfterIP);
u64 State = AfterIP;
for(int i = 1; i <= 16; ++i)
{
u32 L = State >> 32, R = State;
u32 LInverse = PermuteInverse(L);
u32 NewR = Feistel(i, m_SubKeys[i-1], R, LInverse);
if(i != 16)
State = ((u64)R << 32) | NewR;
else
State = ((u64)NewR << 32) | R;
}
u64 AfterFP = FinalPermutation(State);
Log(LogPermutations, "Final", AfterFP);
return AfterFP;
}
};
u8 DES::IPTable[64] =
{
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6
};
u8 DES::FPTable[64] =
{
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25,
32, 0, 40, 8, 48, 16, 56, 24
};
u8 DES::PermutationTable[32] = {
7, 28, 21, 10, 26, 2, 19, 13,
23, 29, 5, 0, 18, 8, 24, 30,
22, 1, 14, 27, 6, 9, 17, 31,
15, 4, 20, 3, 11, 12, 25, 16
};
u8 DES::InversePermutationTable[32] = {
11, 17, 5, 27, 25, 10, 20, 0,
13, 21, 3, 28, 29, 7, 18, 24,
31, 22, 12, 6, 26, 2, 16, 8,
14, 30, 4, 19, 1, 9, 15, 23
};
u4 DES::SBOX[8][64] =
{
{
14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
3, 10, 10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
},
{
15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
},
{
10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
},
{
7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
},
{
2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
},
{
12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
},
{
4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
},
{
13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
}
};
u8 DES::ExpansionTable[48] =
{
31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12,
11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20,
19, 20, 21, 22, 23, 24,
23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 0
};
u8 DES::PermutationChoice1Table[56] =
{
56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3
};
u8 DES::PermutationChoice2Table[48] =
{
13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54,
29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31
};
u8 DES::LeftRotations[16] =
{
1, 1, 2, 2,
2, 2, 2, 2,
1, 2, 2, 2,
2, 2, 2, 1
};
struct TestVector
{
u64 Key;
u64 Input;
u64 Output;
};
#define WBDES_KEY 0x3032343234363236ULL
TestVector Tests[1] = {
{
WBDES_KEY,
0x1122334455667788ULL,
0xc403d32e2bc6cfeeULL,
}
};
static u64 GetRand()
{
u64 Output = 0;
for(int i = 0; i < 8; ++i)
{
Output <<= 8;
Output |= rand() & 0xFF ;
}
return Output;
}
int main(int, char **)
{
//TraceFile.open("trace");
DES d((LogMessages_t)((int)LogFeistel|(int)LogRounds|(int)LogPermutations));
u64 pt = 0x5555555555555553ULL;
//Tests[0].Input;
u64 perm = d.InitialPermutation(pt);
u64 deperm = d.FinalPermutation(perm);
printf("pt = %16llx, perm = %16llx, deperm = %16llx\n", pt, perm, deperm);
for(int i = 0; i < sizeof(DES::IPTable); ++i)
{
assert(DES::FPTable[DES::IPTable[i]] == i);
assert(DES::IPTable[DES::FPTable[i]] == i);
}
for(int i = 0; i < 10; ++i)
{
u64 value = GetRand();
u64 IP = d.InitialPermutation(value);
u64 FP = d.FinalPermutation(IP);
assert(value == FP);
FP = d.FinalPermutation(value);
IP = d.InitialPermutation(FP);
assert(value == IP);
u32 v32 = value;
u32 P = d.Permute(v32);
u32 I = d.PermuteInverse(P);
assert(v32 == I);
I = d.PermuteInverse(value);
P = d.Permute(I);
assert(v32 == P);
}
for(int i = 0; i < sizeof(Tests)/sizeof(Tests[0]); ++i)
{
u64 Output = d.EncryptBlock(Tests[i].Key, Tests[i].Input);
assert(Output == Tests[i].Output);
}
printf("All tests passed\n");
TraceFile.close();
}