void InvCipher()
{
int i, j, round=0;
for(i=0; i<4; i++)
{
for(j=0; j<4; j++)
{
state[j][i] = in[i*4 + j];
}
}
AddRoundKey(Nr);
for(round=Nr-1; round>0; round--)
{
InvShiftRows();
InvSubBytes();
AddRoundKey(round);
InvMixColumns();
}
InvShiftRows();
InvSubBytes();
AddRoundKey(0);
for(i=0; i<4; i++)
{
for(j=0; j<4; j++)
{
out[i*4+j]=state[j][i];
}
}
}
void AES_dec(BYTE* input,BYTE* output,BYTE *w,BYTE Nr)
{
BYTE gState[4][4];
DWORD i,round;
AES_Memset(&gState[0][0],0,16);
for ( i = 0; i < (4 * NB); i++)
{
gState[i % 4][ i / 4] = input[i];
}
AddRoundKey(Nr,w,gState);
for ( round = Nr-1; round >= 1; round--) // main round loop
{
InvShiftRows(gState);
InvSubBytes(gState);
AddRoundKey(round,w,gState);
InvMixColumns(gState);
} // end main round loop for InvCipher
InvShiftRows(gState);
InvSubBytes(gState);
AddRoundKey(0,w,gState);
// output = state
for (i = 0; i < (4 * NB); i++)
{
output[i] = gState[i % 4][ i / 4];
}
}
void aes_invcipher(ctx_aes* aes, uint8_t* input, uint8_t* output) // decipher 16-bit input
{
// state = input
int i;
int round;
memset(&aes->State[0][0],0,16);
for (i = 0; i < (4 * aes->Nb); i++)
{
aes->State[i % 4][ i / 4] = input[i];
}
AddRoundKey(aes, aes->Nr);
for (round = aes->Nr-1; round >= 1; round--) // main round loop
{
InvShiftRows(aes);
InvSubBytes(aes);
AddRoundKey(aes, round);
InvMixColumns(aes);
} // end main round loop for InvCipher
InvShiftRows(aes);
InvSubBytes(aes);
AddRoundKey(aes, 0);
// output = state
for (i = 0; i < (4 * aes->Nb); i++)
{
output[i] = aes->State[i % 4][ i / 4];
}
} // InvCipher()
void
AES_CPU_Impl_O0::DecryptBlock(UINT8 *dst, const UINT8 *src)
{
UINT8 m_state[m_Nb][4];
for( UINT32 i = 0; i < 4; i++ )
for( UINT32 j = 0; j < 4; j++ )
m_state[j][i] = src[i*4 + j];
// Add the First round key to the state before starting the rounds.
AddRoundKey(m_state, m_Nr);
// There will be m_Nr rounds.
// The first m_Nr-1 rounds are identical.
// These m_Nr-1 rounds are executed in the loop below.
for( UINT32 round = m_Nr-1; round > 0; round-- )
{
InvShiftRows(m_state);
InvSubBytes(m_state);
AddRoundKey(m_state, round);
InvMixColumns(m_state);
}
// The last round is given below.
// The MixColumns function is not here in the last round.
InvShiftRows(m_state);
InvSubBytes(m_state);
AddRoundKey(m_state, 0);
for( UINT32 i = 0; i < 4; i++ )
for( UINT32 j = 0; j < 4; j++ )
dst[i*4 + j] = m_state[j][i];
}
void InvCipher(unsigned char * input, unsigned char * output) // decipher 16-bit input
{
// state = input
int i, round;
memset(&State[0][0],0,16);
for (i = 0; i < (4 * Nb); i++)
{
State[i % 4][ i / 4] = input[i];
}
AddRoundKey(Nr);
for (round = Nr-1; round >= 1; round--) // main round loop
{
InvShiftRows();
InvSubBytes();
AddRoundKey(round);
InvMixColumns();
} // end main round loop for InvCipher
InvShiftRows();
InvSubBytes();
AddRoundKey(0);
// output = state
for (i = 0; i < (4 * Nb); i++)
{
output[i] = State[i % 4][ i / 4];
}
} // InvCipher()
// Manque une fonction de dechiffrement
void Decipher(unsigned char *out, unsigned char in[], unsigned char Key[], int Nr)
{
int i,j,round=0;
unsigned char T[16],U[16], V[16],W[16];
unsigned char RoundKey[240];
//On fabrique les clefs de ronde
KeyExpansion( RoundKey, Key, 10);
//On copide le messge dans le bloc d'etat
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
W[4*j+i] = in[4*j + i];
}
}
// On "pele" derniere ronde
// La fonction MixColumns n'est pas dans la derniere ronde
AddRoundKey(V,W,RoundKey,Nr);
InvShiftRows(U,V);
InvSubBytes(T,U);
// Il y a Nr rondes.
// Les Nr-1 premieres rondes sont identiques
// Ces Nr-1 rondes sont dechiffrees dans la boucle for ci-dessous
for(round=Nr-1;round>0;round--)
{
AddRoundKey(W,T,RoundKey,round);
InvMixColumns(V,W);
InvShiftRows(U,V);
InvSubBytes(T,U);
}
// AddKey de la premiere clef
AddRoundKey(W,T,RoundKey,0);
// Le processus de dechiffremen est fini
// On copie le bloc d'etat du message dans le bloc de message clair (out)
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
out[j*4+i]=W[4*j+i];
}
}
}
unsigned char* AES::InvCipher(unsigned char* input)
{
unsigned char state[4][4];
int i,r,c;
for(r=0; r<4; r++)
{
for(c=0; c<4 ;c++)
{
state[r][c] = input[c*4+r];
}
}
AddRoundKey(state, w[10]);
for(i=9; i>=0; i--)
{
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(state, w[i]);
if(i)
{
InvMixColumns(state);
}
}
for(r=0; r<4; r++)
{
for(c=0; c<4 ;c++)
{
input[c*4+r] = state[r][c];
}
}
return input;
}
void aeslite_break(unsigned char plaintext[], unsigned char ciphertext[], unsigned char out[])
{
unsigned char plain[4][4];
unsigned char cipher[4][4];
// Copy the input to the plain.
build_state_array_from_string(plaintext, plain);
build_state_array_from_string(ciphertext, cipher);
InvMixColumns(cipher);
InvShiftRows(cipher);
InvSubBytes(cipher);
// Copy the state to the output array
out[0] = plain[0][0] ^ cipher[0][0];
out[1] = plain[1][0] ^ cipher[1][0];
out[2] = plain[2][0] ^ cipher[2][0];
out[3] = plain[3][0] ^ cipher[3][0];
out[4] = plain[0][1] ^ cipher[0][1];
out[5] = plain[1][1] ^ cipher[1][1];
out[6] = plain[2][1] ^ cipher[2][1];
out[7] = plain[3][1] ^ cipher[3][1];
out[8] = plain[0][2] ^ cipher[0][2];
out[9] = plain[1][2] ^ cipher[1][2];
out[10] = plain[2][2] ^ cipher[2][2];
out[11] = plain[3][2] ^ cipher[3][2];
out[12] = plain[0][3] ^ cipher[0][3];
out[13] = plain[1][3] ^ cipher[1][3];
out[14] = plain[2][3] ^ cipher[2][3];
out[15] = plain[3][3] ^ cipher[3][3];
}
void InvCipher(WORD block[Nb], WORD key[Nb*(Nr+1)])
{
for(int round=Nr-1; round>0; round--)
{
log_it("Round %d started with:\n", block);
// InvShiftRows
InvShiftRows(block);
log_it("After InvShiftRows\n", block);
// InvByteSub
for(int i=0; i<Nb; i++)
{
BYTE* temp = (BYTE*)&block[i];
for (int j = 0; j < 4; j++)
temp[j] = InvSubBytesTab[temp[j]];
block[i] = pack(temp);
}
log_it("After InvByteSub\n", block);
// AddRoundKey
AddRoundKey(block, &key[4*round]);
log_it("After AddRoundKey\n", block);
// InvMixColumn
InvMixColumn(block);
log_it("After InvMixColumn\n", block);
}
// InvShiftRows
InvShiftRows(block);
log_it("After InvShiftRows\n", block);
// InvByteSub
for(int i=0; i<Nb; i++)
{
BYTE* temp = (BYTE*)&block[i];
for (int j = 0; j < 4; j++)
temp[j] = InvSubBytesTab[temp[j]];
block[i] = pack(temp);
}
log_it("After InvByteSub\n", block);
// AddRoundKey
AddRoundKey(block, &key[0]);
log_it("After AddRoundKey\n", block);
}
// InvCipher is the main function that decrypts the CipherText.
void InvCipher(char in[])
{
int i,j,round=0;
int q,z;
///sharan testing
//Copy the input CipherText to state array.
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
state[j][i] = in[i*4 + j];
}
}
// Add the First round key to the state before starting the rounds.
AddRoundKey(Nr);
// There will be Nr rounds.
// The first Nr-1 rounds are identical.
// These Nr-1 rounds are executed in the loop below.
for(round=Nr-1;round>0;round--)
{
InvShiftRows();
InvSubBytes();
AddRoundKey(round);
InvMixColumns();
}
// The last round is given below.
// The MixColumns function is not here in the last round.
InvShiftRows();
InvSubBytes();
AddRoundKey(0);
// The decryption process is over.
// Copy the state array to output array.
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
out[i*4+j]=state[j][i];
}
}
strcat(out2,out);
}
// decrypt is the main function that decrypts the CipherText.
void decrypt(uint8_t *out, uint8_t *in, uint8_t *expanded_key)
{
int i,j,round=0;
uint8_t state[4][4];
int Nr = 128/32+6;// replace 128 by 192, 256 for larger keys
//Copy the input CipherText to state array.
for(i=0; i<4; i++) {
for(j=0; j<4; j++) {
state[j][i] = in[i*4 + j];
}
}
// Add the First round key to the state before starting the rounds.
AddRoundKey(Nr,state,expanded_key);
// There will be Nr rounds.
// The first Nr-1 rounds are identical.
// These Nr-1 rounds are executed in the loop below.
for(round=Nr-1; round>0; round--) {
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(round,state,expanded_key);
InvMixColumns(state);
}
// The last round is given below.
// The MixColumns function is not here in the last round.
InvShiftRows(state);
InvSubBytes(state);
AddRoundKey(0,state,expanded_key);
// The decryption process is over.
// Copy the state array to output array.
for(i=0; i<4; i++) {
for(j=0; j<4; j++) {
out[i*4+j]=state[j][i];
}
}
}
/**
* This method performs decrypt operation given cipher.
* It read tables from tf and ciphertext from fp.
* Decrypts using key. Using fiestel structure, decrypts is nothigs but encryption
* with reverse round keys input.
*/
void ProcessDecrypt(char *key, FILE *tf, FILE *fp) {
table_check = 0;
ProcessTableCheck(tf);
char buf[16];
int ret = fread(buf, 1, 16, fp);
if (ret < 16) {
fprintf(stderr,
"Input size for decryption can not be less than 16 bytes\n");
exit(1);
}
int i, Nr = 10, Nb = 4, round;
unsigned char **state = (unsigned char **) malloc(
sizeof(unsigned char *) * 4);
for (i = 0; i < 4; i++)
state[i] = (unsigned char *) malloc(sizeof(unsigned char) * 4);
copyInStateArray(state, buf);
unsigned char **word = doProcessKeyExpand(key);
printOutD(state, "iinput", 0);
AddRoundKey(state, word, Nr * Nb);
printWordD(word, "ik_sch", Nr * Nb, 0);
for (round = Nr - 1; round > 0; round--) {
printOutD(state, "istart", Nr - round);
InvShiftRows(state);
printOutD(state, "is_row", Nr - round);
InvSubBytes(state);
printOutD(state, "is_box", Nr - round);
AddRoundKey(state, word, round * Nb);
printWordD(word, "ik_sch", round * Nb, Nr - round);
printOutD(state, "ik_add", Nr - round);
MixColumns(state, INVP);
}
printOutD(state, "istart", Nr - round);
InvShiftRows(state);
printOutD(state, "is_row", Nr - round);
InvSubBytes(state);
printOutD(state, "is_box", Nr - round);
AddRoundKey(state, word, 0);
printWordD(word, "ik_sch", round * Nb, Nr - round);
printOutD(state, "ioutput", Nr - round);
}
void
AES_InvCipher(void *_ctx, u1 *data)
{
char r;
AES_CTX *ctx = (AES_CTX *)_ctx;
u4 *w = ctx->W;
w = &w[ctx->Nr * Nb];
AddRoundKey((u4 *)data, w);
w -= 4;
for(r = 1;r < ctx->Nr;r++) {
InvShiftRows(data);
InvSubBytes(data);
AddRoundKey((u4 *)data, w);
InvMixColumns(data);
w -= 4;
}
InvShiftRows(data);
InvSubBytes(data);
AddRoundKey((u4 *)data, w);
}
int main(int argc, char** argv){
print(state);
KeySchedule();
AddRoundKey();
for(iteracja = 1; iteracja < ROUND_cnt; ++iteracja){
SubBytes();
ShiftRows();
MixColumns();
print(state);
AddRoundKey();
}
SubBytes();
ShiftRows()
AddRoundKey();
print(state); /*encrypted*/
AddRoundKey();
InvShiftRows();
InvSubBytes();
for(iteracja = ROUND_cnt-1; iteracja > 0; --iteracja){
AddRoundKey();
InvMixColumns();
InvShiftRows();
InvSubBytes();
}
AddRoundKey();
print(state);
return 0;
}
line AesDecrypt(const void* decrypt_data,
const size_t decrypt_data_size,
const AesKey& decrypt_key)
{
unsigned char data[bytes_row_size][bytes_columns_size];
unsigned char expandkey[expand_key_size][bytes_row_size][bytes_columns_size];
unsigned char okdata[bytes_row_size*bytes_columns_size];
line ret;
const unsigned char* lp_decrypt = (const unsigned char*)decrypt_data;
KeyExpansion(decrypt_key._key,expandkey);
for(size_t encrypted = 0;
encrypted < decrypt_data_size;
encrypted += (bytes_row_size*bytes_columns_size))
{
for(size_t row = 0; row < bytes_row_size; ++row)
{
for(size_t col = 0; col < bytes_columns_size; ++col)
{
data[row][col] = lp_decrypt[row + col * bytes_columns_size];
}
}
AddRoundKey(data,expandkey[expand_key_size-1]);
for(intptr_t i = expand_key_size - 2; i >= 0; --i)
{
InvShiftRows(data);
InvSubstituteBytes(data);
AddRoundKey(data,expandkey[i]);
if(i > 0)
InvMixColumns(data);
}
for(size_t row = 0; row < bytes_row_size; ++row)
{
for(size_t col = 0; col < bytes_columns_size; ++col)
{
okdata[row + col * bytes_columns_size] = data[row][col];
}
}
ret.append(okdata,sizeof(okdata));
lp_decrypt += bytes_row_size * bytes_columns_size;
}
return ret;
}
void HAM_CALLCONV aes_decrypt (uchar *in, uchar *expkey, uchar *out)
{
uchar state[Nb * 4];
unsigned round;
memcpy (state, in, sizeof(state));
AddRoundKey ((unsigned *)state, (unsigned *)expkey + Nr * Nb);
InvShiftRows(state);
for( round = Nr; round--; )
{
AddRoundKey ((unsigned *)state, (unsigned *)expkey + round * Nb);
if( round )
InvMixSubColumns (state);
}
memcpy (out, state, sizeof(state));
}
