void Safe2Decrypt_RIJ128(const Ipp8u* in,
Ipp8u* out,
int Nr,
const Ipp8u* RoundKey,
const void* sbox)
{
Ipp32u state[4];
int round=0;
UNREFERENCED_PARAMETER(sbox);
// copy input to the state array
TRANSPOSE((Ipp8u*)state, in);
// add the round key to the state before starting the rounds.
XorRoundKey((Ipp32u*)state, (Ipp32u*)(RoundKey+Nr*16));
// there will be Nr rounds
for(round=Nr-1;round>0;round--) {
invShiftRows(state);
invSubBytes((Ipp8u*)state);
XorRoundKey(state,(Ipp32u*)(RoundKey+round*16));
invMixColumns(state);
}
// last round
invShiftRows(state);
invSubBytes((Ipp8u*)state);
XorRoundKey(state,(Ipp32u*)(RoundKey+0*16));
// copy from the state to output
TRANSPOSE(out, (Ipp8u*)state);
}
void FastRijndael::decryptTwoRounds(unsigned char** block){
if (!_initd){
return;
}
_round = 2;
addRoundKey(block);
invMixColumns(block);
invShiftRows(block);
invSubBytes(block);
_round--;
addRoundKey(block);
invMixColumns(block);
invShiftRows(block);
invSubBytes(block);
_round--;
addRoundKey(block);
}
void FastRijndael::decrypt(unsigned char** block){
if (!_initd){
return;
}
_round = _nr;
addRoundKey(block);
_round--;
for (; _round > 0; _round--){
invShiftRows(block);
invSubBytes(block);
addRoundKey(block);
invMixColumns(block);
}
invShiftRows(block);
invSubBytes(block);
addRoundKey(block);
}
/*
'A'(41) 'E'(45) 'I'(49) 'M'(4d) invS-BOX f8 68 a4 65
'B'(42) 'F'(46) 'J'(4a) 'N'(4e) --------> f6 98 5c b6
'C'(43) 'G'(47) 'K'(4b) 'O'(4f) 64 16 cc 92
'D'(44) 'H'(48) 'L'(4c) 'P'(50) 86 d4 5d 6c
*/
void test_invSubBytes_given_ABCDEFGHIJK(void){
printf("No2.0 - invSubBytes\n");
uint8_t exState[4][4] = {{0xf8,0x68,0xa4,0x65}, \
{0xf6,0x98,0x5c,0xb6}, \
{0x64,0x16,0xcc,0x92}, \
{0x86,0xd4,0x5d,0x6c} };
char* str = "ABCDEFGHIJKLMNOP";
uint8_t state[4][4];
convStrToState(str,state);
// printfState(state);
printf("\n");
invSubBytes(state);
// printfState(state);
TEST_ASSERT_EQUAL_STATE(exState,state);
}
