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support for twofish cipher

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This commit is contained in:
Philipp Crocoll
2013-09-03 23:10:59 +02:00
parent b9dce51afa
commit 48ad2b309b
17 changed files with 3663 additions and 736 deletions
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20
src/KeePass.sln
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@@ -15,6 +15,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MonoDroidUnitTesting", "mon
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Kp2aUnitTests", "Kp2aUnitTests\Kp2aUnitTests.csproj", "{46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}" Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Kp2aUnitTests", "Kp2aUnitTests\Kp2aUnitTests.csproj", "{46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}"
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TwofishCipher", "TwofishCipher\TwofishCipher.csproj", "{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}"
EndProject
Global Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU Debug|Any CPU = Debug|Any CPU
@@ -182,6 +184,24 @@ Global
{46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|Mixed Platforms.Deploy.0 = ReleaseNoNet|Any CPU {46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|Mixed Platforms.Deploy.0 = ReleaseNoNet|Any CPU
{46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|Win32.ActiveCfg = Release|Any CPU {46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|Win32.ActiveCfg = Release|Any CPU
{46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU {46B769B8-2C58-4138-9CC0-70E3AE3C9A3A}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|Any CPU.Build.0 = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|Win32.ActiveCfg = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Debug|x64.ActiveCfg = Debug|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|Any CPU.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|Any CPU.Build.0 = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|Mixed Platforms.Build.0 = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|Win32.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.Release|x64.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|Any CPU.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|Any CPU.Build.0 = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|Mixed Platforms.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|Mixed Platforms.Build.0 = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|Win32.ActiveCfg = Release|Any CPU
{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU
EndGlobalSection EndGlobalSection
GlobalSection(SolutionProperties) = preSolution GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE HideSolutionNode = FALSE

121
src/TwofishCipher/Crypto/Twofish.cs Normal file
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@@ -0,0 +1,121 @@
/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for Twofish encryption algorithm of which more information can be found at http://www.counterpane.com/twofish.html.
/// This is based on the MS cryptographic framework and can therefore be used in place of the RijndaelManaged classes
/// provided by MS in System.Security.Cryptography and the other related classes
/// </summary>
public sealed class Twofish : SymmetricAlgorithm
{
/// <summary>
/// This is the Twofish constructor.
/// </summary>
public Twofish()
{
this.LegalKeySizesValue = new KeySizes[]{new KeySizes(128,256,64)}; // this allows us to have 128,192,256 key sizes
this.LegalBlockSizesValue = new KeySizes[]{new KeySizes(128,128,0)}; // this is in bits - typical of MS - always 16 bytes
this.BlockSize = 128; // set this to 16 bytes we cannot have any other value
this.KeySize = 128; // in bits - this can be changed to 128,192,256
this.Padding = PaddingMode.Zeros;
this.Mode = CipherMode.ECB;
}
/// <summary>
/// Creates an object that supports ICryptoTransform that can be used to encrypt data using the Twofish encryption algorithm.
/// </summary>
/// <param name="key">A byte array that contains a key. The length of this key should be equal to the KeySize property</param>
/// <param name="iv">A byte array that contains an initialization vector. The length of this IV should be equal to the BlockSize property</param>
public override ICryptoTransform CreateEncryptor(byte[] key, byte[] iv)
{
Key = key; // this appears to make a new copy
if (Mode == CipherMode.CBC)
IV = iv;
return new TwofishEncryption(KeySize, ref KeyValue, ref IVValue, ModeValue, TwofishBase.EncryptionDirection.Encrypting);
}
/// <summary>
/// Creates an object that supports ICryptoTransform that can be used to decrypt data using the Twofish encryption algorithm.
/// </summary>
/// <param name="key">A byte array that contains a key. The length of this key should be equal to the KeySize property</param>
/// <param name="iv">A byte array that contains an initialization vector. The length of this IV should be equal to the BlockSize property</param>
public override ICryptoTransform CreateDecryptor(byte[] key, byte[] iv)
{
Key = key;
if (Mode == CipherMode.CBC)
IV = iv;
return new TwofishEncryption(KeySize, ref KeyValue, ref IVValue, ModeValue, TwofishBase.EncryptionDirection.Decrypting);
}
/// <summary>
/// Generates a random initialization Vector (IV).
/// </summary>
public override void GenerateIV()
{
IV = new byte[16]{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
}
/// <summary>
/// Generates a random Key. This is only really useful in testing scenarios.
/// </summary>
public override void GenerateKey()
{
Key = new byte[KeySize/8];
// set the array to all 0 - implement a random key generation mechanism later probably based on PRNG
for (int i=Key.GetLowerBound(0);i<Key.GetUpperBound(0);i++)
{
Key[i]=0;
}
}
/// <summary>
/// Override the Set method on this property so that we only support CBC and EBC
/// </summary>
public override CipherMode Mode
{
set
{
switch (value)
{
case CipherMode.CBC:
break;
case CipherMode.ECB:
break;
default:
throw (new CryptographicException("Specified CipherMode is not supported."));
}
this.ModeValue = value;
}
}
}
}

641
src/TwofishCipher/Crypto/TwofishBase.cs Normal file
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@@ -0,0 +1,641 @@
/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
//#define FEISTEL
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for TwofishBase.
/// </summary>
internal class TwofishBase
{
public enum EncryptionDirection
{
Encrypting,
Decrypting
}
public TwofishBase()
{
}
protected int inputBlockSize = BLOCK_SIZE/8;
protected int outputBlockSize = BLOCK_SIZE/8;
/*
+*****************************************************************************
*
* Function Name: f32
*
* Function: Run four bytes through keyed S-boxes and apply MDS matrix
*
* Arguments: x = input to f function
* k32 = pointer to key dwords
* keyLen = total key length (k32 --> keyLey/2 bits)
*
* Return: The output of the keyed permutation applied to x.
*
* Notes:
* This function is a keyed 32-bit permutation. It is the major building
* block for the Twofish round function, including the four keyed 8x8
* permutations and the 4x4 MDS matrix multiply. This function is used
* both for generating round subkeys and within the round function on the
* block being encrypted.
*
* This version is fairly slow and pedagogical, although a smartcard would
* probably perform the operation exactly this way in firmware. For
* ultimate performance, the entire operation can be completed with four
* lookups into four 256x32-bit tables, with three dword xors.
*
* The MDS matrix is defined in TABLE.H. To multiply by Mij, just use the
* macro Mij(x).
*
-****************************************************************************/
private static uint f32(uint x,ref uint[] k32,int keyLen)
{
byte[] b = {b0(x),b1(x),b2(x),b3(x)};
/* Run each byte thru 8x8 S-boxes, xoring with key byte at each stage. */
/* Note that each byte goes through a different combination of S-boxes.*/
//*((DWORD *)b) = Bswap(x); /* make b[0] = LSB, b[3] = MSB */
switch (((keyLen + 63)/64) & 3)
{
case 0: /* 256 bits of key */
b[0] = (byte)(P8x8[P_04,b[0]] ^ b0(k32[3]));
b[1] = (byte)(P8x8[P_14,b[1]] ^ b1(k32[3]));
b[2] = (byte)(P8x8[P_24,b[2]] ^ b2(k32[3]));
b[3] = (byte)(P8x8[P_34,b[3]] ^ b3(k32[3]));
/* fall thru, having pre-processed b[0]..b[3] with k32[3] */
goto case 3;
case 3: /* 192 bits of key */
b[0] = (byte)(P8x8[P_03,b[0]] ^ b0(k32[2]));
b[1] = (byte)(P8x8[P_13,b[1]] ^ b1(k32[2]));
b[2] = (byte)(P8x8[P_23,b[2]] ^ b2(k32[2]));
b[3] = (byte)(P8x8[P_33,b[3]] ^ b3(k32[2]));
/* fall thru, having pre-processed b[0]..b[3] with k32[2] */
goto case 2;
case 2: /* 128 bits of key */
b[0] = P8x8[P_00, P8x8[P_01, P8x8[P_02, b[0]] ^ b0(k32[1])] ^ b0(k32[0])];
b[1] = P8x8[P_10, P8x8[P_11, P8x8[P_12, b[1]] ^ b1(k32[1])] ^ b1(k32[0])];
b[2] = P8x8[P_20, P8x8[P_21, P8x8[P_22, b[2]] ^ b2(k32[1])] ^ b2(k32[0])];
b[3] = P8x8[P_30, P8x8[P_31, P8x8[P_32, b[3]] ^ b3(k32[1])] ^ b3(k32[0])];
break;
}
/* Now perform the MDS matrix multiply inline. */
return (uint)((M00(b[0]) ^ M01(b[1]) ^ M02(b[2]) ^ M03(b[3]))) ^
(uint)((M10(b[0]) ^ M11(b[1]) ^ M12(b[2]) ^ M13(b[3])) << 8) ^
(uint)((M20(b[0]) ^ M21(b[1]) ^ M22(b[2]) ^ M23(b[3])) << 16) ^
(uint)((M30(b[0]) ^ M31(b[1]) ^ M32(b[2]) ^ M33(b[3])) << 24) ;
}
/*
+*****************************************************************************
*
* Function Name: reKey
*
* Function: Initialize the Twofish key schedule from key32
*
* Arguments: key = ptr to keyInstance to be initialized
*
* Return: TRUE on success
*
* Notes:
* Here we precompute all the round subkeys, although that is not actually
* required. For example, on a smartcard, the round subkeys can
* be generated on-the-fly using f32()
*
-****************************************************************************/
protected bool reKey(int keyLen, ref uint[] key32)
{
int i,k64Cnt;
keyLength = keyLen;
rounds = numRounds[(keyLen-1)/64];
int subkeyCnt = ROUND_SUBKEYS + 2*rounds;
uint A,B;
uint[] k32e = new uint[MAX_KEY_BITS/64];
uint[] k32o = new uint[MAX_KEY_BITS/64]; /* even/odd key dwords */
k64Cnt=(keyLen+63)/64; /* round up to next multiple of 64 bits */
for (i=0;i<k64Cnt;i++)
{ /* split into even/odd key dwords */
k32e[i]=key32[2*i ];
k32o[i]=key32[2*i+1];
/* compute S-box keys using (12,8) Reed-Solomon code over GF(256) */
sboxKeys[k64Cnt-1-i]=RS_MDS_Encode(k32e[i],k32o[i]); /* reverse order */
}
for (i=0;i<subkeyCnt/2;i++) /* compute round subkeys for PHT */
{
A = f32((uint)(i*SK_STEP) ,ref k32e, keyLen); /* A uses even key dwords */
B = f32((uint)(i*SK_STEP+SK_BUMP),ref k32o, keyLen); /* B uses odd key dwords */
B = ROL(B,8);
subKeys[2*i ] = A+ B; /* combine with a PHT */
subKeys[2*i+1] = ROL(A+2*B,SK_ROTL);
}
return true;
}
protected void blockDecrypt(ref uint[] x)
{
uint t0,t1;
uint[] xtemp = new uint[4];
if (cipherMode == CipherMode.CBC)
{
x.CopyTo(xtemp,0);
}
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy in the block, add whitening */
x[i] ^= subKeys[OUTPUT_WHITEN+i];
for (int r=rounds-1;r>=0;r--) /* main Twofish decryption loop */
{
t0 = f32( x[0] ,ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8),ref sboxKeys,keyLength);
x[2] = ROL(x[2],1);
x[2]^= t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ]; /* PHT, round keys */
x[3]^= t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1];
x[3] = ROR(x[3],1);
if (r>0) /* unswap, except for last round */
{
t0 = x[0]; x[0]= x[2]; x[2] = t0;
t1 = x[1]; x[1]= x[3]; x[3] = t1;
}
}
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy out, with whitening */
{
x[i] ^= subKeys[INPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
{
x[i] ^= IV[i];
IV[i] = xtemp[i];
}
}
}
protected void blockEncrypt(ref uint[] x)
{
uint t0,t1,tmp;
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy in the block, add whitening */
{
x[i] ^= subKeys[INPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
x[i] ^= IV[i];
}
for (int r=0;r<rounds;r++) /* main Twofish encryption loop */ // 16==rounds
{
#if FEISTEL
t0 = f32(ROR(x[0], (r+1)/2),ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8+(r+1)/2),ref sboxKeys,keyLength);
/* PHT, round keys */
x[2]^= ROL(t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ], r /2);
x[3]^= ROR(t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1],(r+2) /2);
#else
t0 = f32( x[0] ,ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8),ref sboxKeys,keyLength);
x[3] = ROL(x[3],1);
x[2]^= t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ]; /* PHT, round keys */
x[3]^= t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1];
x[2] = ROR(x[2],1);
#endif
if (r < rounds-1) /* swap for next round */
{
tmp = x[0]; x[0]= x[2]; x[2] = tmp;
tmp = x[1]; x[1]= x[3]; x[3] = tmp;
}
}
#if FEISTEL
x[0] = ROR(x[0],8); /* "final permutation" */
x[1] = ROL(x[1],8);
x[2] = ROR(x[2],8);
x[3] = ROL(x[3],8);
#endif
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy out, with whitening */
{
x[i] ^= subKeys[OUTPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
{
IV[i] = x[i];
}
}
}
private int[] numRounds = {0,ROUNDS_128,ROUNDS_192,ROUNDS_256};
/*
+*****************************************************************************
*
* Function Name: RS_MDS_Encode
*
* Function: Use (12,8) Reed-Solomon code over GF(256) to produce
* a key S-box dword from two key material dwords.
*
* Arguments: k0 = 1st dword
* k1 = 2nd dword
*
* Return: Remainder polynomial generated using RS code
*
* Notes:
* Since this computation is done only once per reKey per 64 bits of key,
* the performance impact of this routine is imperceptible. The RS code
* chosen has "simple" coefficients to allow smartcard/hardware implementation
* without lookup tables.
*
-****************************************************************************/
static private uint RS_MDS_Encode(uint k0,uint k1)
{
uint i,j;
uint r;
for (i=r=0;i<2;i++)
{
r ^= (i>0) ? k0 : k1; /* merge in 32 more key bits */
for (j=0;j<4;j++) /* shift one byte at a time */
RS_rem(ref r);
}
return r;
}
protected uint[] sboxKeys = new uint[MAX_KEY_BITS/64]; /* key bits used for S-boxes */
protected uint[] subKeys = new uint[TOTAL_SUBKEYS]; /* round subkeys, input/output whitening bits */
protected uint[] Key = {0,0,0,0,0,0,0,0}; //new int[MAX_KEY_BITS/32];
protected uint[] IV = {0,0,0,0}; // this should be one block size
private int keyLength;
private int rounds;
protected CipherMode cipherMode = CipherMode.ECB;
#region These are all the definitions that were found in AES.H
static private readonly int BLOCK_SIZE = 128; /* number of bits per block */
static private readonly int MAX_ROUNDS = 16; /* max # rounds (for allocating subkey array) */
static private readonly int ROUNDS_128 = 16; /* default number of rounds for 128-bit keys*/
static private readonly int ROUNDS_192 = 16; /* default number of rounds for 192-bit keys*/
static private readonly int ROUNDS_256 = 16; /* default number of rounds for 256-bit keys*/
static private readonly int MAX_KEY_BITS = 256; /* max number of bits of key */
// static private readonly int MIN_KEY_BITS = 128; /* min number of bits of key (zero pad) */
//#define VALID_SIG 0x48534946 /* initialization signature ('FISH') */
//#define MCT_OUTER 400 /* MCT outer loop */
//#define MCT_INNER 10000 /* MCT inner loop */
//#define REENTRANT 1 /* nonzero forces reentrant code (slightly slower) */
static private readonly int INPUT_WHITEN = 0; /* subkey array indices */
static private readonly int OUTPUT_WHITEN = (INPUT_WHITEN + BLOCK_SIZE/32);
static private readonly int ROUND_SUBKEYS = (OUTPUT_WHITEN + BLOCK_SIZE/32); /* use 2 * (# rounds) */
static private readonly int TOTAL_SUBKEYS = (ROUND_SUBKEYS + 2*MAX_ROUNDS);
#endregion
#region These are all the definitions that were found in TABLE.H that we need
/* for computing subkeys */
static private readonly uint SK_STEP = 0x02020202u;
static private readonly uint SK_BUMP = 0x01010101u;
static private readonly int SK_ROTL = 9;
/* Reed-Solomon code parameters: (12,8) reversible code
g(x) = x**4 + (a + 1/a) x**3 + a x**2 + (a + 1/a) x + 1
where a = primitive root of field generator 0x14D */
static private readonly uint RS_GF_FDBK = 0x14D; /* field generator */
static private void RS_rem(ref uint x)
{
byte b = (byte) (x >> 24);
// TODO: maybe change g2 and g3 to bytes
uint g2 = (uint)(((b << 1) ^ (((b & 0x80)==0x80) ? RS_GF_FDBK : 0 )) & 0xFF);
uint g3 = (uint)(((b >> 1) & 0x7F) ^ (((b & 1)==1) ? RS_GF_FDBK >> 1 : 0 ) ^ g2) ;
x = (x << 8) ^ (g3 << 24) ^ (g2 << 16) ^ (g3 << 8) ^ b;
}
/* Macros for the MDS matrix
* The MDS matrix is (using primitive polynomial 169):
* 01 EF 5B 5B
* 5B EF EF 01
* EF 5B 01 EF
* EF 01 EF 5B
*----------------------------------------------------------------
* More statistical properties of this matrix (from MDS.EXE output):
*
* Min Hamming weight (one byte difference) = 8. Max=26. Total = 1020.
* Prob[8]: 7 23 42 20 52 95 88 94 121 128 91
* 102 76 41 24 8 4 1 3 0 0 0
* Runs[8]: 2 4 5 6 7 8 9 11
* MSBs[8]: 1 4 15 8 18 38 40 43
* HW= 8: 05040705 0A080E0A 14101C14 28203828 50407050 01499101 A080E0A0
* HW= 9: 04050707 080A0E0E 10141C1C 20283838 40507070 80A0E0E0 C6432020 07070504
* 0E0E0A08 1C1C1410 38382820 70705040 E0E0A080 202043C6 05070407 0A0E080E
* 141C101C 28382038 50704070 A0E080E0 4320C620 02924B02 089A4508
* Min Hamming weight (two byte difference) = 3. Max=28. Total = 390150.
* Prob[3]: 7 18 55 149 270 914 2185 5761 11363 20719 32079
* 43492 51612 53851 52098 42015 31117 20854 11538 6223 2492 1033
* MDS OK, ROR: 6+ 7+ 8+ 9+ 10+ 11+ 12+ 13+ 14+ 15+ 16+
* 17+ 18+ 19+ 20+ 21+ 22+ 23+ 24+ 25+ 26+
*/
static private readonly int MDS_GF_FDBK = 0x169; /* primitive polynomial for GF(256)*/
static private int LFSR1(int x)
{
return ( ((x) >> 1) ^ ((((x) & 0x01)==0x01) ? MDS_GF_FDBK/2 : 0));
}
static private int LFSR2(int x)
{
return ( ((x) >> 2) ^ ((((x) & 0x02)==0x02) ? MDS_GF_FDBK/2 : 0) ^
((((x) & 0x01)==0x01) ? MDS_GF_FDBK/4 : 0));
}
// TODO: not the most efficient use of code but it allows us to update the code a lot quicker we can possibly optimize this code once we have got it all working
static private int Mx_1(int x)
{
return x; /* force result to int so << will work */
}
static private int Mx_X(int x)
{
return x ^ LFSR2(x); /* 5B */
}
static private int Mx_Y(int x)
{
return x ^ LFSR1(x) ^ LFSR2(x); /* EF */
}
static private int M00(int x)
{
return Mul_1(x);
}
static private int M01(int x)
{
return Mul_Y(x);
}
static private int M02(int x)
{
return Mul_X(x);
}
static private int M03(int x)
{
return Mul_X(x);
}
static private int M10(int x)
{
return Mul_X(x);
}
static private int M11(int x)
{
return Mul_Y(x);
}
static private int M12(int x)
{
return Mul_Y(x);
}
static private int M13(int x)
{
return Mul_1(x);
}
static private int M20(int x)
{
return Mul_Y(x);
}
static private int M21(int x)
{
return Mul_X(x);
}
static private int M22(int x)
{
return Mul_1(x);
}
static private int M23(int x)
{
return Mul_Y(x);
}
static private int M30(int x)
{
return Mul_Y(x);
}
static private int M31(int x)
{
return Mul_1(x);
}
static private int M32(int x)
{
return Mul_Y(x);
}
static private int M33(int x)
{
return Mul_X(x);
}
static private int Mul_1(int x)
{
return Mx_1(x);
}
static private int Mul_X(int x)
{
return Mx_X(x);
}
static private int Mul_Y(int x)
{
return Mx_Y(x);
}
/* Define the fixed p0/p1 permutations used in keyed S-box lookup.
By changing the following constant definitions for P_ij, the S-boxes will
automatically get changed in all the Twofish source code. Note that P_i0 is
the "outermost" 8x8 permutation applied. See the f32() function to see
how these constants are to be used.
*/
static private readonly int P_00 = 1; /* "outermost" permutation */
static private readonly int P_01 = 0;
static private readonly int P_02 = 0;
static private readonly int P_03 = (P_01^1); /* "extend" to larger key sizes */
static private readonly int P_04 = 1;
static private readonly int P_10 = 0;
static private readonly int P_11 = 0;
static private readonly int P_12 = 1;
static private readonly int P_13 = (P_11^1);
static private readonly int P_14 = 0;
static private readonly int P_20 = 1;
static private readonly int P_21 = 1;
static private readonly int P_22 = 0;
static private readonly int P_23 = (P_21^1);
static private readonly int P_24 = 0;
static private readonly int P_30 = 0;
static private readonly int P_31 = 1;
static private readonly int P_32 = 1;
static private readonly int P_33 = (P_31^1);
static private readonly int P_34 = 1;
/* fixed 8x8 permutation S-boxes */
/***********************************************************************
* 07:07:14 05/30/98 [4x4] TestCnt=256. keySize=128. CRC=4BD14D9E.
* maxKeyed: dpMax = 18. lpMax =100. fixPt = 8. skXor = 0. skDup = 6.
* log2(dpMax[ 6..18])= --- 15.42 1.33 0.89 4.05 7.98 12.05
* log2(lpMax[ 7..12])= 9.32 1.01 1.16 4.23 8.02 12.45
* log2(fixPt[ 0.. 8])= 1.44 1.44 2.44 4.06 6.01 8.21 11.07 14.09 17.00
* log2(skXor[ 0.. 0])
* log2(skDup[ 0.. 6])= --- 2.37 0.44 3.94 8.36 13.04 17.99
***********************************************************************/
static private byte[,] P8x8 =
{
/* p0: */
/* dpMax = 10. lpMax = 64. cycleCnt= 1 1 1 0. */
/* 817D6F320B59ECA4.ECB81235F4A6709D.BA5E6D90C8F32471.D7F4126E9B3085CA. */
/* Karnaugh maps:
* 0111 0001 0011 1010. 0001 1001 1100 1111. 1001 1110 0011 1110. 1101 0101 1111 1001.
* 0101 1111 1100 0100. 1011 0101 0010 0000. 0101 1000 1100 0101. 1000 0111 0011 0010.
* 0000 1001 1110 1101. 1011 1000 1010 0011. 0011 1001 0101 0000. 0100 0010 0101 1011.
* 0111 0100 0001 0110. 1000 1011 1110 1001. 0011 0011 1001 1101. 1101 0101 0000 1100.
*/
{
0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76,
0x9A, 0x92, 0x80, 0x78, 0xE4, 0xDD, 0xD1, 0x38,
0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48,
0xF2, 0xD0, 0x8B, 0x30, 0x84, 0x54, 0xDF, 0x23,
0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C,
0xA6, 0xEB, 0xA5, 0xBE, 0x16, 0x0C, 0xE3, 0x61,
0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1,
0xE1, 0xE6, 0xBD, 0x45, 0xE2, 0xF4, 0xB6, 0x66,
0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA,
0xEA, 0x77, 0x39, 0xAF, 0x33, 0xC9, 0x62, 0x71,
0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7,
0xA1, 0x1D, 0xAA, 0xED, 0x06, 0x70, 0xB2, 0xD2,
0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB,
0x9E, 0x9C, 0x52, 0x1B, 0x5F, 0x93, 0x0A, 0xEF,
0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64,
0x2A, 0xCE, 0xCB, 0x2F, 0xFC, 0x97, 0x05, 0x7A,
0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02,
0xB8, 0xDA, 0xB0, 0x17, 0x55, 0x1F, 0x8A, 0x7D,
0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,
0x6E, 0x50, 0xDE, 0x68, 0x65, 0xBC, 0xDB, 0xF8,
0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00,
0x6F, 0x9D, 0x36, 0x42, 0x4A, 0x5E, 0xC1, 0xE0
},
/* p1: */
/* dpMax = 10. lpMax = 64. cycleCnt= 2 0 0 1. */
/* 28BDF76E31940AC5.1E2B4C376DA5F908.4C75169A0ED82B3F.B951C3DE647F208A. */
/* Karnaugh maps:
* 0011 1001 0010 0111. 1010 0111 0100 0110. 0011 0001 1111 0100. 1111 1000 0001 1100.
* 1100 1111 1111 1010. 0011 0011 1110 0100. 1001 0110 0100 0011. 0101 0110 1011 1011.
* 0010 0100 0011 0101. 1100 1000 1000 1110. 0111 1111 0010 0110. 0000 1010 0000 0011.
* 1101 1000 0010 0001. 0110 1001 1110 0101. 0001 0100 0101 0111. 0011 1011 1111 0010.
*/
{
0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8,
0x4A, 0xD3, 0xE6, 0x6B, 0x45, 0x7D, 0xE8, 0x4B,
0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F,
0x5E, 0xBA, 0xAE, 0x5B, 0x8A, 0x00, 0xBC, 0x9D,
0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3,
0xB2, 0x73, 0x4C, 0x54, 0x92, 0x74, 0x36, 0x51,
0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C,
0x13, 0x95, 0x9C, 0xC7, 0x24, 0x46, 0x3B, 0x70,
0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC,
0x03, 0x6F, 0x08, 0xBF, 0x40, 0xE7, 0x2B, 0xE2,
0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17,
0x66, 0x94, 0xA1, 0x1D, 0x3D, 0xF0, 0xDE, 0xB3,
0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49,
0x81, 0x88, 0xEE, 0x21, 0xC4, 0x1A, 0xEB, 0xD9,
0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48,
0x4F, 0xF2, 0x65, 0x8E, 0x78, 0x5C, 0x58, 0x19,
0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5,
0xCE, 0xE9, 0x68, 0x44, 0xE0, 0x4D, 0x43, 0x69,
0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC,
0x22, 0xC9, 0xC0, 0x9B, 0x89, 0xD4, 0xED, 0xAB,
0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2,
0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xBE, 0x91
}
};
#endregion
#region These are all the definitions that were found in PLATFORM.H that we need
// left rotation
private static uint ROL(uint x, int n)
{
return ( ((x) << ((n) & 0x1F)) | (x) >> (32-((n) & 0x1F)) );
}
// right rotation
private static uint ROR(uint x,int n)
{
return (((x) >> ((n) & 0x1F)) | ((x) << (32-((n) & 0x1F))));
}
// first byte
protected static byte b0(uint x)
{
return (byte)(x );//& 0xFF);
}
// second byte
protected static byte b1(uint x)
{
return (byte)((x >> 8));// & (0xFF));
}
// third byte
protected static byte b2(uint x)
{
return (byte)((x >> 16));// & (0xFF));
}
// fourth byte
protected static byte b3(uint x)
{
return (byte)((x >> 24));// & (0xFF));
}
#endregion
}
}

193
src/TwofishCipher/Crypto/TwofishEncryption.cs Normal file
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/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for TwofishEncryption.
/// </summary>
internal class TwofishEncryption : TwofishBase, ICryptoTransform
{
public TwofishEncryption(int keyLen, ref byte[] key, ref byte[] iv, CipherMode cMode, EncryptionDirection direction)
{
// convert our key into an array of ints
for (int i=0;i<key.Length/4;i++)
{
Key[i] = (uint)( key[i*4+3]<<24) | (uint)(key[i*4+2] << 16) | (uint)(key[i*4+1] << 8) | (uint)(key[i*4+0]);
}
cipherMode = cMode;
// we only need to convert our IV if we are using CBC
if (cipherMode == CipherMode.CBC)
{
for (int i=0;i<4;i++)
{
IV[i] = (uint)( iv[i*4+3]<<24) | (uint)(iv[i*4+2] << 16) | (uint)(iv[i*4+1] << 8) | (uint)(iv[i*4+0]);
}
}
encryptionDirection = direction;
reKey(keyLen,ref Key);
}
// need to have this method due to IDisposable - just can't think of a reason to use it for in this class
public void Dispose()
{
}
/// <summary>
/// Transform a block depending on whether we are encrypting or decrypting
/// </summary>
/// <param name="inputBuffer"></param>
/// <param name="inputOffset"></param>
/// <param name="inputCount"></param>
/// <param name="outputBuffer"></param>
/// <param name="outputOffset"></param>
/// <returns></returns>
public int TransformBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount,
byte[] outputBuffer,
int outputOffset
)
{
uint[] x=new uint[4];
// load it up
for (int i=0;i<4;i++)
{
x[i]= (uint)(inputBuffer[i*4+3+inputOffset]<<24) | (uint)(inputBuffer[i*4+2+inputOffset] << 16) |
(uint)(inputBuffer[i*4+1+inputOffset] << 8) | (uint)(inputBuffer[i*4+0+inputOffset]);
}
if (encryptionDirection == EncryptionDirection.Encrypting)
{
blockEncrypt(ref x);
}
else
{
blockDecrypt(ref x);
}
// load it up
for (int i=0;i<4;i++)
{
outputBuffer[i*4+0+outputOffset] = b0(x[i]);
outputBuffer[i*4+1+outputOffset] = b1(x[i]);
outputBuffer[i*4+2+outputOffset] = b2(x[i]);
outputBuffer[i*4+3+outputOffset] = b3(x[i]);
}
return inputCount;
}
public byte[] TransformFinalBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount
)
{
byte[] outputBuffer;// = new byte[0];
if (inputCount>0)
{
outputBuffer = new byte[16]; // blocksize
uint[] x=new uint[4];
// load it up
for (int i=0;i<4;i++) // should be okay as we have already said to pad with zeros
{
x[i]= (uint)(inputBuffer[i*4+3+inputOffset]<<24) | (uint)(inputBuffer[i*4+2+inputOffset] << 16) |
(uint)(inputBuffer[i*4+1+inputOffset] << 8) | (uint)(inputBuffer[i*4+0+inputOffset]);
}
if (encryptionDirection == EncryptionDirection.Encrypting)
{
blockEncrypt(ref x);
}
else
{
blockDecrypt(ref x);
}
// load it up
for (int i=0;i<4;i++)
{
outputBuffer[i*4+0] = b0(x[i]);
outputBuffer[i*4+1] = b1(x[i]);
outputBuffer[i*4+2] = b2(x[i]);
outputBuffer[i*4+3] = b3(x[i]);
}
}
else
{
outputBuffer = new byte[0]; // the .NET framework doesn't like it if you return null - this calms it down
}
return outputBuffer;
}
// not worked out this property yet - placing break points here just don't get caught.
private bool canReuseTransform = true;
public bool CanReuseTransform
{
get
{
return canReuseTransform;
}
}
// I normally set this to false when block encrypting so that I can work on one block at a time
// but for compression and stream type ciphers this can be set to true so that you get all the data
private bool canTransformMultipleBlocks = false;
public bool CanTransformMultipleBlocks
{
get
{
return canTransformMultipleBlocks;
}
}
public int InputBlockSize
{
get
{
return inputBlockSize;
}
}
public int OutputBlockSize
{
get
{
return outputBlockSize;
}
}
private EncryptionDirection encryptionDirection;
}
}

674
src/TwofishCipher/License.txt Normal file
View File

@@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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The licenses for most software and other practical works are designed
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34
src/TwofishCipher/Properties/AssemblyInfo.cs Normal file
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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Android.App;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("TwofishCipher")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("TwofishCipher")]
[assembly: AssemblyCopyright("Copyright © 2013")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
[assembly: ComVisible(false)]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]
// Add some common permissions, these can be removed if not needed
[assembly: UsesPermission(Android.Manifest.Permission.Internet)]
[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage)]

21
src/TwofishCipher/Readme.txt Normal file
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Twofish Cipher for KeePass Password Safe
Copyright (C) 2009-2010 SEG Tech <me@gogogadgetscott.info>
PREFACE
Enables KeePass to encrypt databases using the Twofish algorithm.
REQUIREMENTS
This plugin requires KeePass 2.0x.
INSTALLATION
Just copy TwofishCipher.dll to the same directory where KeePass.exe is located
and KeePass should automatically recognize and load the plugin.
CREDITS
Many thanks to Dominik Reichl for creating KeePass Password Safe, without which,
this plugin would not exist. Thanks also goes to Shaun Wilde for C#
implementation of the Twofish cipher as posted on The Code Project.

50
src/TwofishCipher/Resources/AboutResources.txt Normal file
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Images, layout descriptions, binary blobs and string dictionaries can be included
in your application as resource files. Various Android APIs are designed to
operate on the resource IDs instead of dealing with images, strings or binary blobs
directly.
For example, a sample Android app that contains a user interface layout (main.xml),
an internationalization string table (strings.xml) and some icons (drawable-XXX/icon.png)
would keep its resources in the "Resources" directory of the application:
Resources/
drawable-hdpi/
icon.png
drawable-ldpi/
icon.png
drawable-mdpi/
icon.png
layout/
main.xml
values/
strings.xml
In order to get the build system to recognize Android resources, set the build action to
"AndroidResource". The native Android APIs do not operate directly with filenames, but
instead operate on resource IDs. When you compile an Android application that uses resources,
the build system will package the resources for distribution and generate a class called
"Resource" that contains the tokens for each one of the resources included. For example,
for the above Resources layout, this is what the Resource class would expose:
public class Resource {
public class drawable {
public const int icon = 0x123;
}
public class layout {
public const int main = 0x456;
}
public class strings {
public const int first_string = 0xabc;
public const int second_string = 0xbcd;
}
}
You would then use R.drawable.icon to reference the drawable/icon.png file, or Resource.layout.main
to reference the layout/main.xml file, or Resource.strings.first_string to reference the first
string in the dictionary file values/strings.xml.

4
src/TwofishCipher/Resources/Values/Strings.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="ApplicationName">$projectname$</string>
</resources>

121
src/TwofishCipher/Twofish.cs Normal file
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/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for Twofish encryption algorithm of which more information can be found at http://www.counterpane.com/twofish.html.
/// This is based on the MS cryptographic framework and can therefore be used in place of the RijndaelManaged classes
/// provided by MS in System.Security.Cryptography and the other related classes
/// </summary>
public sealed class Twofish : SymmetricAlgorithm
{
/// <summary>
/// This is the Twofish constructor.
/// </summary>
public Twofish()
{
this.LegalKeySizesValue = new KeySizes[]{new KeySizes(128,256,64)}; // this allows us to have 128,192,256 key sizes
this.LegalBlockSizesValue = new KeySizes[]{new KeySizes(128,128,0)}; // this is in bits - typical of MS - always 16 bytes
this.BlockSize = 128; // set this to 16 bytes we cannot have any other value
this.KeySize = 128; // in bits - this can be changed to 128,192,256
this.Padding = PaddingMode.Zeros;
this.Mode = CipherMode.ECB;
}
/// <summary>
/// Creates an object that supports ICryptoTransform that can be used to encrypt data using the Twofish encryption algorithm.
/// </summary>
/// <param name="key">A byte array that contains a key. The length of this key should be equal to the KeySize property</param>
/// <param name="iv">A byte array that contains an initialization vector. The length of this IV should be equal to the BlockSize property</param>
public override ICryptoTransform CreateEncryptor(byte[] key, byte[] iv)
{
Key = key; // this appears to make a new copy
if (Mode == CipherMode.CBC)
IV = iv;
return new TwofishEncryption(KeySize, ref KeyValue, ref IVValue, ModeValue, TwofishBase.EncryptionDirection.Encrypting);
}
/// <summary>
/// Creates an object that supports ICryptoTransform that can be used to decrypt data using the Twofish encryption algorithm.
/// </summary>
/// <param name="key">A byte array that contains a key. The length of this key should be equal to the KeySize property</param>
/// <param name="iv">A byte array that contains an initialization vector. The length of this IV should be equal to the BlockSize property</param>
public override ICryptoTransform CreateDecryptor(byte[] key, byte[] iv)
{
Key = key;
if (Mode == CipherMode.CBC)
IV = iv;
return new TwofishEncryption(KeySize, ref KeyValue, ref IVValue, ModeValue, TwofishBase.EncryptionDirection.Decrypting);
}
/// <summary>
/// Generates a random initialization Vector (IV).
/// </summary>
public override void GenerateIV()
{
IV = new byte[16]{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
}
/// <summary>
/// Generates a random Key. This is only really useful in testing scenarios.
/// </summary>
public override void GenerateKey()
{
Key = new byte[KeySize/8];
// set the array to all 0 - implement a random key generation mechanism later probably based on PRNG
for (int i=Key.GetLowerBound(0);i<Key.GetUpperBound(0);i++)
{
Key[i]=0;
}
}
/// <summary>
/// Override the Set method on this property so that we only support CBC and EBC
/// </summary>
public override CipherMode Mode
{
set
{
switch (value)
{
case CipherMode.CBC:
break;
case CipherMode.ECB:
break;
default:
throw (new CryptographicException("Specified CipherMode is not supported."));
}
this.ModeValue = value;
}
}
}
}

641
src/TwofishCipher/TwofishBase.cs Normal file
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@@ -0,0 +1,641 @@
/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
//#define FEISTEL
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for TwofishBase.
/// </summary>
internal class TwofishBase
{
public enum EncryptionDirection
{
Encrypting,
Decrypting
}
public TwofishBase()
{
}
protected int inputBlockSize = BLOCK_SIZE/8;
protected int outputBlockSize = BLOCK_SIZE/8;
/*
+*****************************************************************************
*
* Function Name: f32
*
* Function: Run four bytes through keyed S-boxes and apply MDS matrix
*
* Arguments: x = input to f function
* k32 = pointer to key dwords
* keyLen = total key length (k32 --> keyLey/2 bits)
*
* Return: The output of the keyed permutation applied to x.
*
* Notes:
* This function is a keyed 32-bit permutation. It is the major building
* block for the Twofish round function, including the four keyed 8x8
* permutations and the 4x4 MDS matrix multiply. This function is used
* both for generating round subkeys and within the round function on the
* block being encrypted.
*
* This version is fairly slow and pedagogical, although a smartcard would
* probably perform the operation exactly this way in firmware. For
* ultimate performance, the entire operation can be completed with four
* lookups into four 256x32-bit tables, with three dword xors.
*
* The MDS matrix is defined in TABLE.H. To multiply by Mij, just use the
* macro Mij(x).
*
-****************************************************************************/
private static uint f32(uint x,ref uint[] k32,int keyLen)
{
byte[] b = {b0(x),b1(x),b2(x),b3(x)};
/* Run each byte thru 8x8 S-boxes, xoring with key byte at each stage. */
/* Note that each byte goes through a different combination of S-boxes.*/
//*((DWORD *)b) = Bswap(x); /* make b[0] = LSB, b[3] = MSB */
switch (((keyLen + 63)/64) & 3)
{
case 0: /* 256 bits of key */
b[0] = (byte)(P8x8[P_04,b[0]] ^ b0(k32[3]));
b[1] = (byte)(P8x8[P_14,b[1]] ^ b1(k32[3]));
b[2] = (byte)(P8x8[P_24,b[2]] ^ b2(k32[3]));
b[3] = (byte)(P8x8[P_34,b[3]] ^ b3(k32[3]));
/* fall thru, having pre-processed b[0]..b[3] with k32[3] */
goto case 3;
case 3: /* 192 bits of key */
b[0] = (byte)(P8x8[P_03,b[0]] ^ b0(k32[2]));
b[1] = (byte)(P8x8[P_13,b[1]] ^ b1(k32[2]));
b[2] = (byte)(P8x8[P_23,b[2]] ^ b2(k32[2]));
b[3] = (byte)(P8x8[P_33,b[3]] ^ b3(k32[2]));
/* fall thru, having pre-processed b[0]..b[3] with k32[2] */
goto case 2;
case 2: /* 128 bits of key */
b[0] = P8x8[P_00, P8x8[P_01, P8x8[P_02, b[0]] ^ b0(k32[1])] ^ b0(k32[0])];
b[1] = P8x8[P_10, P8x8[P_11, P8x8[P_12, b[1]] ^ b1(k32[1])] ^ b1(k32[0])];
b[2] = P8x8[P_20, P8x8[P_21, P8x8[P_22, b[2]] ^ b2(k32[1])] ^ b2(k32[0])];
b[3] = P8x8[P_30, P8x8[P_31, P8x8[P_32, b[3]] ^ b3(k32[1])] ^ b3(k32[0])];
break;
}
/* Now perform the MDS matrix multiply inline. */
return (uint)((M00(b[0]) ^ M01(b[1]) ^ M02(b[2]) ^ M03(b[3]))) ^
(uint)((M10(b[0]) ^ M11(b[1]) ^ M12(b[2]) ^ M13(b[3])) << 8) ^
(uint)((M20(b[0]) ^ M21(b[1]) ^ M22(b[2]) ^ M23(b[3])) << 16) ^
(uint)((M30(b[0]) ^ M31(b[1]) ^ M32(b[2]) ^ M33(b[3])) << 24) ;
}
/*
+*****************************************************************************
*
* Function Name: reKey
*
* Function: Initialize the Twofish key schedule from key32
*
* Arguments: key = ptr to keyInstance to be initialized
*
* Return: TRUE on success
*
* Notes:
* Here we precompute all the round subkeys, although that is not actually
* required. For example, on a smartcard, the round subkeys can
* be generated on-the-fly using f32()
*
-****************************************************************************/
protected bool reKey(int keyLen, ref uint[] key32)
{
int i,k64Cnt;
keyLength = keyLen;
rounds = numRounds[(keyLen-1)/64];
int subkeyCnt = ROUND_SUBKEYS + 2*rounds;
uint A,B;
uint[] k32e = new uint[MAX_KEY_BITS/64];
uint[] k32o = new uint[MAX_KEY_BITS/64]; /* even/odd key dwords */
k64Cnt=(keyLen+63)/64; /* round up to next multiple of 64 bits */
for (i=0;i<k64Cnt;i++)
{ /* split into even/odd key dwords */
k32e[i]=key32[2*i ];
k32o[i]=key32[2*i+1];
/* compute S-box keys using (12,8) Reed-Solomon code over GF(256) */
sboxKeys[k64Cnt-1-i]=RS_MDS_Encode(k32e[i],k32o[i]); /* reverse order */
}
for (i=0;i<subkeyCnt/2;i++) /* compute round subkeys for PHT */
{
A = f32((uint)(i*SK_STEP) ,ref k32e, keyLen); /* A uses even key dwords */
B = f32((uint)(i*SK_STEP+SK_BUMP),ref k32o, keyLen); /* B uses odd key dwords */
B = ROL(B,8);
subKeys[2*i ] = A+ B; /* combine with a PHT */
subKeys[2*i+1] = ROL(A+2*B,SK_ROTL);
}
return true;
}
protected void blockDecrypt(ref uint[] x)
{
uint t0,t1;
uint[] xtemp = new uint[4];
if (cipherMode == CipherMode.CBC)
{
x.CopyTo(xtemp,0);
}
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy in the block, add whitening */
x[i] ^= subKeys[OUTPUT_WHITEN+i];
for (int r=rounds-1;r>=0;r--) /* main Twofish decryption loop */
{
t0 = f32( x[0] ,ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8),ref sboxKeys,keyLength);
x[2] = ROL(x[2],1);
x[2]^= t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ]; /* PHT, round keys */
x[3]^= t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1];
x[3] = ROR(x[3],1);
if (r>0) /* unswap, except for last round */
{
t0 = x[0]; x[0]= x[2]; x[2] = t0;
t1 = x[1]; x[1]= x[3]; x[3] = t1;
}
}
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy out, with whitening */
{
x[i] ^= subKeys[INPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
{
x[i] ^= IV[i];
IV[i] = xtemp[i];
}
}
}
protected void blockEncrypt(ref uint[] x)
{
uint t0,t1,tmp;
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy in the block, add whitening */
{
x[i] ^= subKeys[INPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
x[i] ^= IV[i];
}
for (int r=0;r<rounds;r++) /* main Twofish encryption loop */ // 16==rounds
{
#if FEISTEL
t0 = f32(ROR(x[0], (r+1)/2),ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8+(r+1)/2),ref sboxKeys,keyLength);
/* PHT, round keys */
x[2]^= ROL(t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ], r /2);
x[3]^= ROR(t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1],(r+2) /2);
#else
t0 = f32( x[0] ,ref sboxKeys,keyLength);
t1 = f32(ROL(x[1],8),ref sboxKeys,keyLength);
x[3] = ROL(x[3],1);
x[2]^= t0 + t1 + subKeys[ROUND_SUBKEYS+2*r ]; /* PHT, round keys */
x[3]^= t0 + 2*t1 + subKeys[ROUND_SUBKEYS+2*r+1];
x[2] = ROR(x[2],1);
#endif
if (r < rounds-1) /* swap for next round */
{
tmp = x[0]; x[0]= x[2]; x[2] = tmp;
tmp = x[1]; x[1]= x[3]; x[3] = tmp;
}
}
#if FEISTEL
x[0] = ROR(x[0],8); /* "final permutation" */
x[1] = ROL(x[1],8);
x[2] = ROR(x[2],8);
x[3] = ROL(x[3],8);
#endif
for (int i=0;i<BLOCK_SIZE/32;i++) /* copy out, with whitening */
{
x[i] ^= subKeys[OUTPUT_WHITEN+i];
if (cipherMode == CipherMode.CBC)
{
IV[i] = x[i];
}
}
}
private int[] numRounds = {0,ROUNDS_128,ROUNDS_192,ROUNDS_256};
/*
+*****************************************************************************
*
* Function Name: RS_MDS_Encode
*
* Function: Use (12,8) Reed-Solomon code over GF(256) to produce
* a key S-box dword from two key material dwords.
*
* Arguments: k0 = 1st dword
* k1 = 2nd dword
*
* Return: Remainder polynomial generated using RS code
*
* Notes:
* Since this computation is done only once per reKey per 64 bits of key,
* the performance impact of this routine is imperceptible. The RS code
* chosen has "simple" coefficients to allow smartcard/hardware implementation
* without lookup tables.
*
-****************************************************************************/
static private uint RS_MDS_Encode(uint k0,uint k1)
{
uint i,j;
uint r;
for (i=r=0;i<2;i++)
{
r ^= (i>0) ? k0 : k1; /* merge in 32 more key bits */
for (j=0;j<4;j++) /* shift one byte at a time */
RS_rem(ref r);
}
return r;
}
protected uint[] sboxKeys = new uint[MAX_KEY_BITS/64]; /* key bits used for S-boxes */
protected uint[] subKeys = new uint[TOTAL_SUBKEYS]; /* round subkeys, input/output whitening bits */
protected uint[] Key = {0,0,0,0,0,0,0,0}; //new int[MAX_KEY_BITS/32];
protected uint[] IV = {0,0,0,0}; // this should be one block size
private int keyLength;
private int rounds;
protected CipherMode cipherMode = CipherMode.ECB;
#region These are all the definitions that were found in AES.H
static private readonly int BLOCK_SIZE = 128; /* number of bits per block */
static private readonly int MAX_ROUNDS = 16; /* max # rounds (for allocating subkey array) */
static private readonly int ROUNDS_128 = 16; /* default number of rounds for 128-bit keys*/
static private readonly int ROUNDS_192 = 16; /* default number of rounds for 192-bit keys*/
static private readonly int ROUNDS_256 = 16; /* default number of rounds for 256-bit keys*/
static private readonly int MAX_KEY_BITS = 256; /* max number of bits of key */
// static private readonly int MIN_KEY_BITS = 128; /* min number of bits of key (zero pad) */
//#define VALID_SIG 0x48534946 /* initialization signature ('FISH') */
//#define MCT_OUTER 400 /* MCT outer loop */
//#define MCT_INNER 10000 /* MCT inner loop */
//#define REENTRANT 1 /* nonzero forces reentrant code (slightly slower) */
static private readonly int INPUT_WHITEN = 0; /* subkey array indices */
static private readonly int OUTPUT_WHITEN = (INPUT_WHITEN + BLOCK_SIZE/32);
static private readonly int ROUND_SUBKEYS = (OUTPUT_WHITEN + BLOCK_SIZE/32); /* use 2 * (# rounds) */
static private readonly int TOTAL_SUBKEYS = (ROUND_SUBKEYS + 2*MAX_ROUNDS);
#endregion
#region These are all the definitions that were found in TABLE.H that we need
/* for computing subkeys */
static private readonly uint SK_STEP = 0x02020202u;
static private readonly uint SK_BUMP = 0x01010101u;
static private readonly int SK_ROTL = 9;
/* Reed-Solomon code parameters: (12,8) reversible code
g(x) = x**4 + (a + 1/a) x**3 + a x**2 + (a + 1/a) x + 1
where a = primitive root of field generator 0x14D */
static private readonly uint RS_GF_FDBK = 0x14D; /* field generator */
static private void RS_rem(ref uint x)
{
byte b = (byte) (x >> 24);
// TODO: maybe change g2 and g3 to bytes
uint g2 = (uint)(((b << 1) ^ (((b & 0x80)==0x80) ? RS_GF_FDBK : 0 )) & 0xFF);
uint g3 = (uint)(((b >> 1) & 0x7F) ^ (((b & 1)==1) ? RS_GF_FDBK >> 1 : 0 ) ^ g2) ;
x = (x << 8) ^ (g3 << 24) ^ (g2 << 16) ^ (g3 << 8) ^ b;
}
/* Macros for the MDS matrix
* The MDS matrix is (using primitive polynomial 169):
* 01 EF 5B 5B
* 5B EF EF 01
* EF 5B 01 EF
* EF 01 EF 5B
*----------------------------------------------------------------
* More statistical properties of this matrix (from MDS.EXE output):
*
* Min Hamming weight (one byte difference) = 8. Max=26. Total = 1020.
* Prob[8]: 7 23 42 20 52 95 88 94 121 128 91
* 102 76 41 24 8 4 1 3 0 0 0
* Runs[8]: 2 4 5 6 7 8 9 11
* MSBs[8]: 1 4 15 8 18 38 40 43
* HW= 8: 05040705 0A080E0A 14101C14 28203828 50407050 01499101 A080E0A0
* HW= 9: 04050707 080A0E0E 10141C1C 20283838 40507070 80A0E0E0 C6432020 07070504
* 0E0E0A08 1C1C1410 38382820 70705040 E0E0A080 202043C6 05070407 0A0E080E
* 141C101C 28382038 50704070 A0E080E0 4320C620 02924B02 089A4508
* Min Hamming weight (two byte difference) = 3. Max=28. Total = 390150.
* Prob[3]: 7 18 55 149 270 914 2185 5761 11363 20719 32079
* 43492 51612 53851 52098 42015 31117 20854 11538 6223 2492 1033
* MDS OK, ROR: 6+ 7+ 8+ 9+ 10+ 11+ 12+ 13+ 14+ 15+ 16+
* 17+ 18+ 19+ 20+ 21+ 22+ 23+ 24+ 25+ 26+
*/
static private readonly int MDS_GF_FDBK = 0x169; /* primitive polynomial for GF(256)*/
static private int LFSR1(int x)
{
return ( ((x) >> 1) ^ ((((x) & 0x01)==0x01) ? MDS_GF_FDBK/2 : 0));
}
static private int LFSR2(int x)
{
return ( ((x) >> 2) ^ ((((x) & 0x02)==0x02) ? MDS_GF_FDBK/2 : 0) ^
((((x) & 0x01)==0x01) ? MDS_GF_FDBK/4 : 0));
}
// TODO: not the most efficient use of code but it allows us to update the code a lot quicker we can possibly optimize this code once we have got it all working
static private int Mx_1(int x)
{
return x; /* force result to int so << will work */
}
static private int Mx_X(int x)
{
return x ^ LFSR2(x); /* 5B */
}
static private int Mx_Y(int x)
{
return x ^ LFSR1(x) ^ LFSR2(x); /* EF */
}
static private int M00(int x)
{
return Mul_1(x);
}
static private int M01(int x)
{
return Mul_Y(x);
}
static private int M02(int x)
{
return Mul_X(x);
}
static private int M03(int x)
{
return Mul_X(x);
}
static private int M10(int x)
{
return Mul_X(x);
}
static private int M11(int x)
{
return Mul_Y(x);
}
static private int M12(int x)
{
return Mul_Y(x);
}
static private int M13(int x)
{
return Mul_1(x);
}
static private int M20(int x)
{
return Mul_Y(x);
}
static private int M21(int x)
{
return Mul_X(x);
}
static private int M22(int x)
{
return Mul_1(x);
}
static private int M23(int x)
{
return Mul_Y(x);
}
static private int M30(int x)
{
return Mul_Y(x);
}
static private int M31(int x)
{
return Mul_1(x);
}
static private int M32(int x)
{
return Mul_Y(x);
}
static private int M33(int x)
{
return Mul_X(x);
}
static private int Mul_1(int x)
{
return Mx_1(x);
}
static private int Mul_X(int x)
{
return Mx_X(x);
}
static private int Mul_Y(int x)
{
return Mx_Y(x);
}
/* Define the fixed p0/p1 permutations used in keyed S-box lookup.
By changing the following constant definitions for P_ij, the S-boxes will
automatically get changed in all the Twofish source code. Note that P_i0 is
the "outermost" 8x8 permutation applied. See the f32() function to see
how these constants are to be used.
*/
static private readonly int P_00 = 1; /* "outermost" permutation */
static private readonly int P_01 = 0;
static private readonly int P_02 = 0;
static private readonly int P_03 = (P_01^1); /* "extend" to larger key sizes */
static private readonly int P_04 = 1;
static private readonly int P_10 = 0;
static private readonly int P_11 = 0;
static private readonly int P_12 = 1;
static private readonly int P_13 = (P_11^1);
static private readonly int P_14 = 0;
static private readonly int P_20 = 1;
static private readonly int P_21 = 1;
static private readonly int P_22 = 0;
static private readonly int P_23 = (P_21^1);
static private readonly int P_24 = 0;
static private readonly int P_30 = 0;
static private readonly int P_31 = 1;
static private readonly int P_32 = 1;
static private readonly int P_33 = (P_31^1);
static private readonly int P_34 = 1;
/* fixed 8x8 permutation S-boxes */
/***********************************************************************
* 07:07:14 05/30/98 [4x4] TestCnt=256. keySize=128. CRC=4BD14D9E.
* maxKeyed: dpMax = 18. lpMax =100. fixPt = 8. skXor = 0. skDup = 6.
* log2(dpMax[ 6..18])= --- 15.42 1.33 0.89 4.05 7.98 12.05
* log2(lpMax[ 7..12])= 9.32 1.01 1.16 4.23 8.02 12.45
* log2(fixPt[ 0.. 8])= 1.44 1.44 2.44 4.06 6.01 8.21 11.07 14.09 17.00
* log2(skXor[ 0.. 0])
* log2(skDup[ 0.. 6])= --- 2.37 0.44 3.94 8.36 13.04 17.99
***********************************************************************/
static private byte[,] P8x8 =
{
/* p0: */
/* dpMax = 10. lpMax = 64. cycleCnt= 1 1 1 0. */
/* 817D6F320B59ECA4.ECB81235F4A6709D.BA5E6D90C8F32471.D7F4126E9B3085CA. */
/* Karnaugh maps:
* 0111 0001 0011 1010. 0001 1001 1100 1111. 1001 1110 0011 1110. 1101 0101 1111 1001.
* 0101 1111 1100 0100. 1011 0101 0010 0000. 0101 1000 1100 0101. 1000 0111 0011 0010.
* 0000 1001 1110 1101. 1011 1000 1010 0011. 0011 1001 0101 0000. 0100 0010 0101 1011.
* 0111 0100 0001 0110. 1000 1011 1110 1001. 0011 0011 1001 1101. 1101 0101 0000 1100.
*/
{
0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76,
0x9A, 0x92, 0x80, 0x78, 0xE4, 0xDD, 0xD1, 0x38,
0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48,
0xF2, 0xD0, 0x8B, 0x30, 0x84, 0x54, 0xDF, 0x23,
0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C,
0xA6, 0xEB, 0xA5, 0xBE, 0x16, 0x0C, 0xE3, 0x61,
0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1,
0xE1, 0xE6, 0xBD, 0x45, 0xE2, 0xF4, 0xB6, 0x66,
0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA,
0xEA, 0x77, 0x39, 0xAF, 0x33, 0xC9, 0x62, 0x71,
0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7,
0xA1, 0x1D, 0xAA, 0xED, 0x06, 0x70, 0xB2, 0xD2,
0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB,
0x9E, 0x9C, 0x52, 0x1B, 0x5F, 0x93, 0x0A, 0xEF,
0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64,
0x2A, 0xCE, 0xCB, 0x2F, 0xFC, 0x97, 0x05, 0x7A,
0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02,
0xB8, 0xDA, 0xB0, 0x17, 0x55, 0x1F, 0x8A, 0x7D,
0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,
0x6E, 0x50, 0xDE, 0x68, 0x65, 0xBC, 0xDB, 0xF8,
0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00,
0x6F, 0x9D, 0x36, 0x42, 0x4A, 0x5E, 0xC1, 0xE0
},
/* p1: */
/* dpMax = 10. lpMax = 64. cycleCnt= 2 0 0 1. */
/* 28BDF76E31940AC5.1E2B4C376DA5F908.4C75169A0ED82B3F.B951C3DE647F208A. */
/* Karnaugh maps:
* 0011 1001 0010 0111. 1010 0111 0100 0110. 0011 0001 1111 0100. 1111 1000 0001 1100.
* 1100 1111 1111 1010. 0011 0011 1110 0100. 1001 0110 0100 0011. 0101 0110 1011 1011.
* 0010 0100 0011 0101. 1100 1000 1000 1110. 0111 1111 0010 0110. 0000 1010 0000 0011.
* 1101 1000 0010 0001. 0110 1001 1110 0101. 0001 0100 0101 0111. 0011 1011 1111 0010.
*/
{
0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8,
0x4A, 0xD3, 0xE6, 0x6B, 0x45, 0x7D, 0xE8, 0x4B,
0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F,
0x5E, 0xBA, 0xAE, 0x5B, 0x8A, 0x00, 0xBC, 0x9D,
0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3,
0xB2, 0x73, 0x4C, 0x54, 0x92, 0x74, 0x36, 0x51,
0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C,
0x13, 0x95, 0x9C, 0xC7, 0x24, 0x46, 0x3B, 0x70,
0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC,
0x03, 0x6F, 0x08, 0xBF, 0x40, 0xE7, 0x2B, 0xE2,
0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17,
0x66, 0x94, 0xA1, 0x1D, 0x3D, 0xF0, 0xDE, 0xB3,
0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49,
0x81, 0x88, 0xEE, 0x21, 0xC4, 0x1A, 0xEB, 0xD9,
0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48,
0x4F, 0xF2, 0x65, 0x8E, 0x78, 0x5C, 0x58, 0x19,
0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5,
0xCE, 0xE9, 0x68, 0x44, 0xE0, 0x4D, 0x43, 0x69,
0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC,
0x22, 0xC9, 0xC0, 0x9B, 0x89, 0xD4, 0xED, 0xAB,
0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2,
0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xBE, 0x91
}
};
#endregion
#region These are all the definitions that were found in PLATFORM.H that we need
// left rotation
private static uint ROL(uint x, int n)
{
return ( ((x) << ((n) & 0x1F)) | (x) >> (32-((n) & 0x1F)) );
}
// right rotation
private static uint ROR(uint x,int n)
{
return (((x) >> ((n) & 0x1F)) | ((x) << (32-((n) & 0x1F))));
}
// first byte
protected static byte b0(uint x)
{
return (byte)(x );//& 0xFF);
}
// second byte
protected static byte b1(uint x)
{
return (byte)((x >> 8));// & (0xFF));
}
// third byte
protected static byte b2(uint x)
{
return (byte)((x >> 16));// & (0xFF));
}
// fourth byte
protected static byte b3(uint x)
{
return (byte)((x >> 24));// & (0xFF));
}
#endregion
}
}

71
src/TwofishCipher/TwofishCipher.csproj Normal file
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@@ -0,0 +1,71 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProductVersion>8.0.30703</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{5CF675A5-9BEE-4720-BED9-D5BF14A2EBF9}</ProjectGuid>
<ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>TwofishCipher</RootNamespace>
<AssemblyName>TwofishCipher</AssemblyName>
<FileAlignment>512</FileAlignment>
<AndroidResgenFile>Resources\Resource.Designer.cs</AndroidResgenFile>
<GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="Mono.Android" />
<Reference Include="mscorlib" />
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Resources\Resource.Designer.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Twofish.cs" />
<Compile Include="TwofishBase.cs" />
<Compile Include="TwofishCipherEngine.cs" />
<Compile Include="TwofishEncryption.cs" />
</ItemGroup>
<ItemGroup>
<None Include="Resources\AboutResources.txt" />
</ItemGroup>
<ItemGroup>
<AndroidResource Include="Resources\Values\Strings.xml" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\KeePassLib2Android\KeePassLib2Android.csproj">
<Project>{545b4a6b-8bba-4fbe-92fc-4ac060122a54}</Project>
<Name>KeePassLib2Android</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

127
src/TwofishCipher/TwofishCipherEngine.cs Normal file
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@@ -0,0 +1,127 @@
/*
Twofish Cipher for KeePass Password Safe
Copyright (C) 2009-2010 SEG Tech <me@gogogadgetscott.info>
This program 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 2 of the License, or
(at your option) any later version.
This program 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Diagnostics;
using KeePassLib;
using KeePassLib.Cryptography.Cipher;
using TwofishCipher.Crypto;
namespace TwofishCipher
{
public sealed class TwofishCipherEngine : ICipherEngine
{
private const CipherMode m_rCipherMode = CipherMode.CBC;
private const PaddingMode m_rCipherPadding = PaddingMode.PKCS7;
private PwUuid m_uuidCipher;
private static readonly byte[] TwofishCipherUuidBytes = new byte[]{
0xAD, 0x68, 0xF2, 0x9F, 0x57, 0x6F, 0x4B, 0xB9,
0xA3, 0x6A, 0xD4, 0x7A, 0xF9, 0x65, 0x34, 0x6C
};
public TwofishCipherEngine()
{
m_uuidCipher = new PwUuid(TwofishCipherUuidBytes);
}
public PwUuid CipherUuid
{
get
{
Debug.Assert(m_uuidCipher != null);
return m_uuidCipher;
}
}
public string DisplayName
{
get { return "Twofish (256-Bit Key)"; }
}
private static void ValidateArguments(Stream stream, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
Debug.Assert(stream != null); if(stream == null) throw new ArgumentNullException("stream");
Debug.Assert(pbKey != null); if(pbKey == null) throw new ArgumentNullException("pbKey");
Debug.Assert(pbKey.Length == 32);
if(pbKey.Length != 32) throw new ArgumentException("Key must be 256 bits wide!");
Debug.Assert(pbIV != null); if(pbIV == null) throw new ArgumentNullException("pbIV");
Debug.Assert(pbIV.Length == 16);
if(pbIV.Length != 16) throw new ArgumentException("Initialization vector must be 128 bits wide!");
if(bEncrypt)
{
Debug.Assert(stream.CanWrite);
if(stream.CanWrite == false) throw new ArgumentException("Stream must be writable!");
}
else // Decrypt
{
Debug.Assert(stream.CanRead);
if(stream.CanRead == false) throw new ArgumentException("Encrypted stream must be readable!");
}
}
private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
ValidateArguments(s, bEncrypt, pbKey, pbIV);
Twofish f = new Twofish();
byte[] pbLocalIV = new byte[16];
Array.Copy(pbIV, pbLocalIV, 16);
f.IV = pbLocalIV;
byte[] pbLocalKey = new byte[32];
Array.Copy(pbKey, pbLocalKey, 32);
f.KeySize = 256;
f.Key = pbLocalKey;
f.Mode = m_rCipherMode;
f.Padding = m_rCipherPadding;
ICryptoTransform iTransform = (bEncrypt ? f.CreateEncryptor() : f.CreateDecryptor());
Debug.Assert(iTransform != null);
if(iTransform == null) throw new SecurityException("Unable to create Twofish transform!");
return new CryptoStream(s, iTransform, bEncrypt ? CryptoStreamMode.Write :
CryptoStreamMode.Read);
}
public Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV)
{
return CreateStream(sPlainText, true, pbKey, pbIV);
}
public Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV)
{
return CreateStream(sEncrypted, false, pbKey, pbIV);
}
}
}

193
src/TwofishCipher/TwofishEncryption.cs Normal file
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@@ -0,0 +1,193 @@
/*
A C# implementation of the Twofish cipher
By Shaun Wilde
An article on integrating a C# implementation of the Twofish cipher into the
.NET framework.
http://www.codeproject.com/KB/recipes/twofish_csharp.aspx
The Code Project Open License (CPOL) 1.02
http://www.codeproject.com/info/cpol10.aspx
Download a copy of the CPOL.
http://www.codeproject.com/info/CPOL.zip
*/
using System;
using System.Diagnostics;
using System.Security.Cryptography;
namespace TwofishCipher.Crypto
{
/// <summary>
/// Summary description for TwofishEncryption.
/// </summary>
internal class TwofishEncryption : TwofishBase, ICryptoTransform
{
public TwofishEncryption(int keyLen, ref byte[] key, ref byte[] iv, CipherMode cMode, EncryptionDirection direction)
{
// convert our key into an array of ints
for (int i=0;i<key.Length/4;i++)
{
Key[i] = (uint)( key[i*4+3]<<24) | (uint)(key[i*4+2] << 16) | (uint)(key[i*4+1] << 8) | (uint)(key[i*4+0]);
}
cipherMode = cMode;
// we only need to convert our IV if we are using CBC
if (cipherMode == CipherMode.CBC)
{
for (int i=0;i<4;i++)
{
IV[i] = (uint)( iv[i*4+3]<<24) | (uint)(iv[i*4+2] << 16) | (uint)(iv[i*4+1] << 8) | (uint)(iv[i*4+0]);
}
}
encryptionDirection = direction;
reKey(keyLen,ref Key);
}
// need to have this method due to IDisposable - just can't think of a reason to use it for in this class
public void Dispose()
{
}
/// <summary>
/// Transform a block depending on whether we are encrypting or decrypting
/// </summary>
/// <param name="inputBuffer"></param>
/// <param name="inputOffset"></param>
/// <param name="inputCount"></param>
/// <param name="outputBuffer"></param>
/// <param name="outputOffset"></param>
/// <returns></returns>
public int TransformBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount,
byte[] outputBuffer,
int outputOffset
)
{
uint[] x=new uint[4];
// load it up
for (int i=0;i<4;i++)
{
x[i]= (uint)(inputBuffer[i*4+3+inputOffset]<<24) | (uint)(inputBuffer[i*4+2+inputOffset] << 16) |
(uint)(inputBuffer[i*4+1+inputOffset] << 8) | (uint)(inputBuffer[i*4+0+inputOffset]);
}
if (encryptionDirection == EncryptionDirection.Encrypting)
{
blockEncrypt(ref x);
}
else
{
blockDecrypt(ref x);
}
// load it up
for (int i=0;i<4;i++)
{
outputBuffer[i*4+0+outputOffset] = b0(x[i]);
outputBuffer[i*4+1+outputOffset] = b1(x[i]);
outputBuffer[i*4+2+outputOffset] = b2(x[i]);
outputBuffer[i*4+3+outputOffset] = b3(x[i]);
}
return inputCount;
}
public byte[] TransformFinalBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount
)
{
byte[] outputBuffer;// = new byte[0];
if (inputCount>0)
{
outputBuffer = new byte[16]; // blocksize
uint[] x=new uint[4];
// load it up
for (int i=0;i<4;i++) // should be okay as we have already said to pad with zeros
{
x[i]= (uint)(inputBuffer[i*4+3+inputOffset]<<24) | (uint)(inputBuffer[i*4+2+inputOffset] << 16) |
(uint)(inputBuffer[i*4+1+inputOffset] << 8) | (uint)(inputBuffer[i*4+0+inputOffset]);
}
if (encryptionDirection == EncryptionDirection.Encrypting)
{
blockEncrypt(ref x);
}
else
{
blockDecrypt(ref x);
}
// load it up
for (int i=0;i<4;i++)
{
outputBuffer[i*4+0] = b0(x[i]);
outputBuffer[i*4+1] = b1(x[i]);
outputBuffer[i*4+2] = b2(x[i]);
outputBuffer[i*4+3] = b3(x[i]);
}
}
else
{
outputBuffer = new byte[0]; // the .NET framework doesn't like it if you return null - this calms it down
}
return outputBuffer;
}
// not worked out this property yet - placing break points here just don't get caught.
private bool canReuseTransform = true;
public bool CanReuseTransform
{
get
{
return canReuseTransform;
}
}
// I normally set this to false when block encrypting so that I can work on one block at a time
// but for compression and stream type ciphers this can be set to true so that you get all the data
private bool canTransformMultipleBlocks = false;
public bool CanTransformMultipleBlocks
{
get
{
return canTransformMultipleBlocks;
}
}
public int InputBlockSize
{
get
{
return inputBlockSize;
}
}
public int OutputBlockSize
{
get
{
return outputBlockSize;
}
}
private EncryptionDirection encryptionDirection;
}
}

1481
src/keepass2android/Resources/Resource.designer.cs generated
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3
src/keepass2android/app/App.cs
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@@ -23,9 +23,11 @@ using Android.Content;
using Android.OS; using Android.OS;
using Android.Runtime; using Android.Runtime;
using Android.Widget; using Android.Widget;
using KeePassLib.Cryptography.Cipher;
using KeePassLib.Keys; using KeePassLib.Keys;
using KeePassLib.Serialization; using KeePassLib.Serialization;
using Android.Preferences; using Android.Preferences;
using TwofishCipher;
using keepass2android.Io; using keepass2android.Io;
namespace keepass2android namespace keepass2android
@@ -379,6 +381,7 @@ namespace keepass2android
GetResourceString(key); GetResourceString(key);
} }
#endif #endif
CipherPool.GlobalPool.AddCipher(new TwofishCipherEngine());
} }

4
src/keepass2android/keepass2android.csproj
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@@ -666,6 +666,10 @@
<Project>{A8779D4D-7C49-4C2F-82BD-2CDC448391DA}</Project> <Project>{A8779D4D-7C49-4C2F-82BD-2CDC448391DA}</Project>
<Name>Kp2aKeyboardBinding</Name> <Name>Kp2aKeyboardBinding</Name>
</ProjectReference> </ProjectReference>
<ProjectReference Include="..\TwofishCipher\TwofishCipher.csproj">
<Project>{5cf675a5-9bee-4720-bed9-d5bf14a2ebf9}</Project>
<Name>TwofishCipher</Name>
</ProjectReference>
</ItemGroup> </ItemGroup>
<ProjectExtensions> <ProjectExtensions>
<MonoDevelop> <MonoDevelop>