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/***************************************************************************
* This code is based on public domain Szymon Stefanek AES implementation: *
* http://www.pragmaware.net/software/rijndael/index.php *
* *
* Dynamic tables generation is based on the Brian Gladman work: *
* http://fp.gladman.plus.com/cryptography_technology/rijndael *
***************************************************************************/
#include "rar.hpp"
#ifdef USE_SSE
#include <wmmintrin.h>
#endif
static byte S[256],S5[256],rcon[30];
static byte T1[256][4],T2[256][4],T3[256][4],T4[256][4];
static byte T5[256][4],T6[256][4],T7[256][4],T8[256][4];
static byte U1[256][4],U2[256][4],U3[256][4],U4[256][4];
inline void Xor128(void *dest,const void *arg1,const void *arg2)
{
#ifdef ALLOW_MISALIGNED
((uint32*)dest)[0]=((uint32*)arg1)[0]^((uint32*)arg2)[0];
((uint32*)dest)[1]=((uint32*)arg1)[1]^((uint32*)arg2)[1];
((uint32*)dest)[2]=((uint32*)arg1)[2]^((uint32*)arg2)[2];
((uint32*)dest)[3]=((uint32*)arg1)[3]^((uint32*)arg2)[3];
#else
for (int I=0;I<16;I++)
((byte*)dest)[I]=((byte*)arg1)[I]^((byte*)arg2)[I];
#endif
}
inline void Xor128(byte *dest,const byte *arg1,const byte *arg2,
const byte *arg3,const byte *arg4)
{
#ifdef ALLOW_MISALIGNED
(*(uint32*)dest)=(*(uint32*)arg1)^(*(uint32*)arg2)^(*(uint32*)arg3)^(*(uint32*)arg4);
#else
for (int I=0;I<4;I++)
dest[I]=arg1[I]^arg2[I]^arg3[I]^arg4[I];
#endif
}
inline void Copy128(byte *dest,const byte *src)
{
#ifdef ALLOW_MISALIGNED
((uint32*)dest)[0]=((uint32*)src)[0];
((uint32*)dest)[1]=((uint32*)src)[1];
((uint32*)dest)[2]=((uint32*)src)[2];
((uint32*)dest)[3]=((uint32*)src)[3];
#else
for (int I=0;I<16;I++)
dest[I]=src[I];
#endif
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// API
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Rijndael::Rijndael()
{
if (S[0]==0)
GenerateTables();
CBCMode = true; // Always true for RAR.
}
void Rijndael::Init(bool Encrypt,const byte *key,uint keyLen,const byte * initVector)
{
#ifdef USE_SSE
// Check SSE here instead of constructor, so if object is a part of some
// structure memset'ed before use, this variable is not lost.
int CPUInfo[4];
__cpuid(CPUInfo, 1);
AES_NI=(CPUInfo[2] & 0x2000000)!=0;
#endif
uint uKeyLenInBytes;
switch(keyLen)
{
case 128:
uKeyLenInBytes = 16;
m_uRounds = 10;
break;
case 192:
uKeyLenInBytes = 24;
m_uRounds = 12;
break;
case 256:
uKeyLenInBytes = 32;
m_uRounds = 14;
break;
}
byte keyMatrix[_MAX_KEY_COLUMNS][4];
for(uint i = 0; i < uKeyLenInBytes; i++)
keyMatrix[i >> 2][i & 3] = key[i];
if (initVector==NULL)
memset(m_initVector, 0, sizeof(m_initVector));
else
for(int i = 0; i < MAX_IV_SIZE; i++)
m_initVector[i] = initVector[i];
keySched(keyMatrix);
if(!Encrypt)
keyEncToDec();
}
void Rijndael::blockEncrypt(const byte *input,size_t inputLen,byte *outBuffer)
{
if (inputLen <= 0)
return;
size_t numBlocks = inputLen/16;
#ifdef USE_SSE
if (AES_NI)
{
blockEncryptSSE(input,numBlocks,outBuffer);
return;
}
#endif
byte *prevBlock = m_initVector;
for(size_t i = numBlocks;i > 0;i--)
{
byte block[16];
if (CBCMode)
Xor128(block,prevBlock,input);
else
Copy128(block,input);
byte temp[4][4];
Xor128(temp,block,m_expandedKey[0]);
Xor128(outBuffer, T1[temp[0][0]],T2[temp[1][1]],T3[temp[2][2]],T4[temp[3][3]]);
Xor128(outBuffer+4, T1[temp[1][0]],T2[temp[2][1]],T3[temp[3][2]],T4[temp[0][3]]);
Xor128(outBuffer+8, T1[temp[2][0]],T2[temp[3][1]],T3[temp[0][2]],T4[temp[1][3]]);
Xor128(outBuffer+12,T1[temp[3][0]],T2[temp[0][1]],T3[temp[1][2]],T4[temp[2][3]]);
for(int r = 1; r < m_uRounds-1; r++)
{
Xor128(temp,outBuffer,m_expandedKey[r]);
Xor128(outBuffer, T1[temp[0][0]],T2[temp[1][1]],T3[temp[2][2]],T4[temp[3][3]]);
Xor128(outBuffer+4, T1[temp[1][0]],T2[temp[2][1]],T3[temp[3][2]],T4[temp[0][3]]);
Xor128(outBuffer+8, T1[temp[2][0]],T2[temp[3][1]],T3[temp[0][2]],T4[temp[1][3]]);
Xor128(outBuffer+12,T1[temp[3][0]],T2[temp[0][1]],T3[temp[1][2]],T4[temp[2][3]]);
}
Xor128(temp,outBuffer,m_expandedKey[m_uRounds-1]);
outBuffer[ 0] = T1[temp[0][0]][1];
outBuffer[ 1] = T1[temp[1][1]][1];
outBuffer[ 2] = T1[temp[2][2]][1];
outBuffer[ 3] = T1[temp[3][3]][1];
outBuffer[ 4] = T1[temp[1][0]][1];
outBuffer[ 5] = T1[temp[2][1]][1];
outBuffer[ 6] = T1[temp[3][2]][1];
outBuffer[ 7] = T1[temp[0][3]][1];
outBuffer[ 8] = T1[temp[2][0]][1];
outBuffer[ 9] = T1[temp[3][1]][1];
outBuffer[10] = T1[temp[0][2]][1];
outBuffer[11] = T1[temp[1][3]][1];
outBuffer[12] = T1[temp[3][0]][1];
outBuffer[13] = T1[temp[0][1]][1];
outBuffer[14] = T1[temp[1][2]][1];
outBuffer[15] = T1[temp[2][3]][1];
Xor128(outBuffer,outBuffer,m_expandedKey[m_uRounds]);
prevBlock=outBuffer;
outBuffer += 16;
input += 16;
}
Copy128(m_initVector,prevBlock);
}
#ifdef USE_SSE
void Rijndael::blockEncryptSSE(const byte *input,size_t numBlocks,byte *outBuffer)
{
__m128i v = _mm_loadu_si128((__m128i*)m_initVector);
__m128i *src=(__m128i*)input;
__m128i *dest=(__m128i*)outBuffer;
__m128i *rkey=(__m128i*)m_expandedKey;
while (numBlocks > 0)
{
__m128i d = _mm_loadu_si128(src++);
if (CBCMode)
v = _mm_xor_si128(v, d);
else
v = d;
__m128i r0 = _mm_loadu_si128(rkey);
v = _mm_xor_si128(v, r0);
for (int i=1; i<m_uRounds; i++)
{
__m128i ri = _mm_loadu_si128(rkey + i);
v = _mm_aesenc_si128(v, ri);
}
__m128i rl = _mm_loadu_si128(rkey + m_uRounds);
v = _mm_aesenclast_si128(v, rl);
_mm_storeu_si128(dest++,v);
numBlocks--;
}
_mm_storeu_si128((__m128i*)m_initVector,v);
}
#endif
void Rijndael::blockDecrypt(const byte *input, size_t inputLen, byte *outBuffer)
{
if (inputLen <= 0)
return;
size_t numBlocks=inputLen/16;
#ifdef USE_SSE
if (AES_NI)
{
blockDecryptSSE(input,numBlocks,outBuffer);
return;
}
#endif
byte block[16], iv[4][4];
memcpy(iv,m_initVector,16);
for (size_t i = numBlocks; i > 0; i--)
{
byte temp[4][4];
Xor128(temp,input,m_expandedKey[m_uRounds]);
Xor128(block, T5[temp[0][0]],T6[temp[3][1]],T7[temp[2][2]],T8[temp[1][3]]);
Xor128(block+4, T5[temp[1][0]],T6[temp[0][1]],T7[temp[3][2]],T8[temp[2][3]]);
Xor128(block+8, T5[temp[2][0]],T6[temp[1][1]],T7[temp[0][2]],T8[temp[3][3]]);
Xor128(block+12,T5[temp[3][0]],T6[temp[2][1]],T7[temp[1][2]],T8[temp[0][3]]);
for(int r = m_uRounds-1; r > 1; r--)
{
Xor128(temp,block,m_expandedKey[r]);
Xor128(block, T5[temp[0][0]],T6[temp[3][1]],T7[temp[2][2]],T8[temp[1][3]]);
Xor128(block+4, T5[temp[1][0]],T6[temp[0][1]],T7[temp[3][2]],T8[temp[2][3]]);
Xor128(block+8, T5[temp[2][0]],T6[temp[1][1]],T7[temp[0][2]],T8[temp[3][3]]);
Xor128(block+12,T5[temp[3][0]],T6[temp[2][1]],T7[temp[1][2]],T8[temp[0][3]]);
}
Xor128(temp,block,m_expandedKey[1]);
block[ 0] = S5[temp[0][0]];
block[ 1] = S5[temp[3][1]];
block[ 2] = S5[temp[2][2]];
block[ 3] = S5[temp[1][3]];
block[ 4] = S5[temp[1][0]];
block[ 5] = S5[temp[0][1]];
block[ 6] = S5[temp[3][2]];
block[ 7] = S5[temp[2][3]];
block[ 8] = S5[temp[2][0]];
block[ 9] = S5[temp[1][1]];
block[10] = S5[temp[0][2]];
block[11] = S5[temp[3][3]];
block[12] = S5[temp[3][0]];
block[13] = S5[temp[2][1]];
block[14] = S5[temp[1][2]];
block[15] = S5[temp[0][3]];
Xor128(block,block,m_expandedKey[0]);
if (CBCMode)
Xor128(block,block,iv);
Copy128((byte*)iv,input);
Copy128(outBuffer,block);
input += 16;
outBuffer += 16;
}
memcpy(m_initVector,iv,16);
}
#ifdef USE_SSE
void Rijndael::blockDecryptSSE(const byte *input, size_t numBlocks, byte *outBuffer)
{
__m128i initVector = _mm_loadu_si128((__m128i*)m_initVector);
__m128i *src=(__m128i*)input;
__m128i *dest=(__m128i*)outBuffer;
__m128i *rkey=(__m128i*)m_expandedKey;
while (numBlocks > 0)
{
__m128i rl = _mm_loadu_si128(rkey + m_uRounds);
__m128i d = _mm_loadu_si128(src++);
__m128i v = _mm_xor_si128(rl, d);
for (int i=m_uRounds-1; i>0; i--)
{
__m128i ri = _mm_loadu_si128(rkey + i);
v = _mm_aesdec_si128(v, ri);
}
__m128i r0 = _mm_loadu_si128(rkey);
v = _mm_aesdeclast_si128(v, r0);
if (CBCMode)
v = _mm_xor_si128(v, initVector);
initVector = d;
_mm_storeu_si128(dest++,v);
numBlocks--;
}
_mm_storeu_si128((__m128i*)m_initVector,initVector);
}
#endif
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// ALGORITHM
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void Rijndael::keySched(byte key[_MAX_KEY_COLUMNS][4])
{
int j,rconpointer = 0;
// Calculate the necessary round keys
// The number of calculations depends on keyBits and blockBits
int uKeyColumns = m_uRounds - 6;
byte tempKey[_MAX_KEY_COLUMNS][4];
// Copy the input key to the temporary key matrix
memcpy(tempKey,key,sizeof(tempKey));
int r = 0;
int t = 0;
// copy values into round key array
for(j = 0;(j < uKeyColumns) && (r <= m_uRounds); )
{
for(;(j < uKeyColumns) && (t < 4); j++, t++)
for (int k=0;k<4;k++)
m_expandedKey[r][t][k]=tempKey[j][k];
if(t == 4)
{
r++;
t = 0;
}
}
while(r <= m_uRounds)
{
tempKey[0][0] ^= S[tempKey[uKeyColumns-1][1]];
tempKey[0][1] ^= S[tempKey[uKeyColumns-1][2]];
tempKey[0][2] ^= S[tempKey[uKeyColumns-1][3]];
tempKey[0][3] ^= S[tempKey[uKeyColumns-1][0]];
tempKey[0][0] ^= rcon[rconpointer++];
if (uKeyColumns != 8)
for(j = 1; j < uKeyColumns; j++)
for (int k=0;k<4;k++)
tempKey[j][k] ^= tempKey[j-1][k];
else
{
for(j = 1; j < uKeyColumns/2; j++)
for (int k=0;k<4;k++)
tempKey[j][k] ^= tempKey[j-1][k];
tempKey[uKeyColumns/2][0] ^= S[tempKey[uKeyColumns/2 - 1][0]];
tempKey[uKeyColumns/2][1] ^= S[tempKey[uKeyColumns/2 - 1][1]];
tempKey[uKeyColumns/2][2] ^= S[tempKey[uKeyColumns/2 - 1][2]];
tempKey[uKeyColumns/2][3] ^= S[tempKey[uKeyColumns/2 - 1][3]];
for(j = uKeyColumns/2 + 1; j < uKeyColumns; j++)
for (int k=0;k<4;k++)
tempKey[j][k] ^= tempKey[j-1][k];
}
for(j = 0; (j < uKeyColumns) && (r <= m_uRounds); )
{
for(; (j < uKeyColumns) && (t < 4); j++, t++)
for (int k=0;k<4;k++)
m_expandedKey[r][t][k] = tempKey[j][k];
if(t == 4)
{
r++;
t = 0;
}
}
}
}
void Rijndael::keyEncToDec()
{
for(int r = 1; r < m_uRounds; r++)
{
byte n_expandedKey[4][4];
for (int i = 0; i < 4; i++)
for (int j = 0; j < 4; j++)
{
byte *w=m_expandedKey[r][j];
n_expandedKey[j][i]=U1[w[0]][i]^U2[w[1]][i]^U3[w[2]][i]^U4[w[3]][i];
}
memcpy(m_expandedKey[r],n_expandedKey,sizeof(m_expandedKey[0]));
}
}
#define ff_poly 0x011b
#define ff_hi 0x80
#define FFinv(x) ((x) ? pow[255 - log[x]]: 0)
#define FFmul02(x) (x ? pow[log[x] + 0x19] : 0)
#define FFmul03(x) (x ? pow[log[x] + 0x01] : 0)
#define FFmul09(x) (x ? pow[log[x] + 0xc7] : 0)
#define FFmul0b(x) (x ? pow[log[x] + 0x68] : 0)
#define FFmul0d(x) (x ? pow[log[x] + 0xee] : 0)
#define FFmul0e(x) (x ? pow[log[x] + 0xdf] : 0)
#define fwd_affine(x) \
(w = (uint)x, w ^= (w<<1)^(w<<2)^(w<<3)^(w<<4), (byte)(0x63^(w^(w>>8))))
#define inv_affine(x) \
(w = (uint)x, w = (w<<1)^(w<<3)^(w<<6), (byte)(0x05^(w^(w>>8))))
void Rijndael::GenerateTables()
{
unsigned char pow[512],log[256];
int i = 0, w = 1;
do
{
pow[i] = (byte)w;
pow[i + 255] = (byte)w;
log[w] = (byte)i++;
w ^= (w << 1) ^ (w & ff_hi ? ff_poly : 0);
} while (w != 1);
for (int i = 0,w = 1; i < sizeof(rcon)/sizeof(rcon[0]); i++)
{
rcon[i] = w;
w = (w << 1) ^ (w & ff_hi ? ff_poly : 0);
}
for(int i = 0; i < 256; ++i)
{
unsigned char b=S[i]=fwd_affine(FFinv((byte)i));
T1[i][1]=T1[i][2]=T2[i][2]=T2[i][3]=T3[i][0]=T3[i][3]=T4[i][0]=T4[i][1]=b;
T1[i][0]=T2[i][1]=T3[i][2]=T4[i][3]=FFmul02(b);
T1[i][3]=T2[i][0]=T3[i][1]=T4[i][2]=FFmul03(b);
S5[i] = b = FFinv(inv_affine((byte)i));
U1[b][3]=U2[b][0]=U3[b][1]=U4[b][2]=T5[i][3]=T6[i][0]=T7[i][1]=T8[i][2]=FFmul0b(b);
U1[b][1]=U2[b][2]=U3[b][3]=U4[b][0]=T5[i][1]=T6[i][2]=T7[i][3]=T8[i][0]=FFmul09(b);
U1[b][2]=U2[b][3]=U3[b][0]=U4[b][1]=T5[i][2]=T6[i][3]=T7[i][0]=T8[i][1]=FFmul0d(b);
U1[b][0]=U2[b][1]=U3[b][2]=U4[b][3]=T5[i][0]=T6[i][1]=T7[i][2]=T8[i][3]=FFmul0e(b);
}
}
#if 0
static void TestRijndael();
struct TestRij {TestRij() {TestRijndael();exit(0);}} GlobalTestRij;
// Test CBC encryption according to NIST 800-38A.
void TestRijndael()
{
byte IV[16]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
byte PT[64]={
0x6b,0xc1,0xbe,0xe2,0x2e,0x40,0x9f,0x96,0xe9,0x3d,0x7e,0x11,0x73,0x93,0x17,0x2a,
0xae,0x2d,0x8a,0x57,0x1e,0x03,0xac,0x9c,0x9e,0xb7,0x6f,0xac,0x45,0xaf,0x8e,0x51,
0x30,0xc8,0x1c,0x46,0xa3,0x5c,0xe4,0x11,0xe5,0xfb,0xc1,0x19,0x1a,0x0a,0x52,0xef,
0xf6,0x9f,0x24,0x45,0xdf,0x4f,0x9b,0x17,0xad,0x2b,0x41,0x7b,0xe6,0x6c,0x37,0x10,
};
byte Key128[16]={0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c};
byte Chk128[16]={0x3f,0xf1,0xca,0xa1,0x68,0x1f,0xac,0x09,0x12,0x0e,0xca,0x30,0x75,0x86,0xe1,0xa7};
byte Key192[24]={0x8e,0x73,0xb0,0xf7,0xda,0x0e,0x64,0x52,0xc8,0x10,0xf3,0x2b,0x80,0x90,0x79,0xe5,0x62,0xf8,0xea,0xd2,0x52,0x2c,0x6b,0x7b};
byte Chk192[16]={0x08,0xb0,0xe2,0x79,0x88,0x59,0x88,0x81,0xd9,0x20,0xa9,0xe6,0x4f,0x56,0x15,0xcd};
byte Key256[32]={0x60,0x3d,0xeb,0x10,0x15,0xca,0x71,0xbe,0x2b,0x73,0xae,0xf0,0x85,0x7d,0x77,0x81,0x1f,0x35,0x2c,0x07,0x3b,0x61,0x08,0xd7,0x2d,0x98,0x10,0xa3,0x09,0x14,0xdf,0xf4};
byte Chk256[16]={0xb2,0xeb,0x05,0xe2,0xc3,0x9b,0xe9,0xfc,0xda,0x6c,0x19,0x07,0x8c,0x6a,0x9d,0x1b};
byte *Key[3]={Key128,Key192,Key256};
byte *Chk[3]={Chk128,Chk192,Chk256};
Rijndael rij; // Declare outside of loop to test re-initialization.
for (uint L=0;L<3;L++)
{
byte Out[16];
wchar Str[sizeof(Out)*2+1];
uint KeyLength=128+L*64;
rij.Init(true,Key[L],KeyLength,IV);
for (uint I=0;I<sizeof(PT);I+=16)
rij.blockEncrypt(PT+I,16,Out);
BinToHex(Chk[L],16,NULL,Str,ASIZE(Str));
mprintf(L"\nAES-%d expected: %s",KeyLength,Str);
BinToHex(Out,sizeof(Out),NULL,Str,ASIZE(Str));
mprintf(L"\nAES-%d result: %s",KeyLength,Str);
if (memcmp(Out,Chk[L],16)==0)
mprintf(L" OK");
else
{
mprintf(L" FAILED");
getchar();
}
}
}
#endif