void deCrypt_AES128(const cryptData_t cryptedText[CRYPT_BSIZE],
plainData_t plainText[PLAIN_BSIZE],
expKey_t expKey[KSCH_AES128_SIZE]) {
uint8_t state[4*NB];
uint32_t* ptr, *statePtr;
uint8_t i, round;
/* copy plain input into state to initialize */
ptr = (uint32_t*) &cryptedText[0];
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*statePtr++ = *ptr++;
/* first iteration, round 0 */
/* take the key from the bottom of the array */
addRoundkey((uint32_t*) &state[0], &expKey[NB*NR_AES128]);
/* Go from the next downto Nround - 1 iterations */
for(round=(NR_AES128 - 1); round > 0; round--) {
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++) {
*statePtr = invSubWord(*statePtr);
statePtr++ ;
}
invShiftRows(state);
invMixColumns((uint32_t*) &state[0]);
addRoundkey((uint32_t*) &state[0], &expKey[round*NB]);
}
/* last iteration, round 0 */
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++) {
*statePtr = invSubWord(*statePtr);
statePtr++ ;
}
invShiftRows(state);
addRoundkey((uint32_t*) &state[0], &expKey[0]);
/* now copy back the crypted text into the buffer */
ptr = (uint32_t*) &plainText[0];
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*ptr++ = *statePtr++;
};
void crypt_AES128( const plainData_t plainText[PLAIN_BSIZE],
cryptData_t cryptedText[CRYPT_BSIZE],
expKey_t expKey[KSCH_AES128_SIZE]) {
uint8_t state[4*NB];
uint32_t* ptr, *statePtr;
uint8_t i, round;
/* copy plain input into state to initialize */
ptr = (uint32_t*) &plainText[0];
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*statePtr++ = *ptr++;
/* first iteration, round 0 */
addRoundkey((uint32_t*) &state[0], &expKey[0]);
/* Nround - 1 iterations */
for(round=1;round<NR_AES128;round++) {
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*statePtr++ = subWord(*statePtr);
shiftRows(state);
mixColumns((uint32_t*) &state[0]);
addRoundkey((uint32_t*) &state[0], &expKey[round*NB]);
}
/* last iteration, round 11 */
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*statePtr++ = subWord(*statePtr);
shiftRows(state);
addRoundkey((uint32_t*) &state[0], &expKey[(NR_AES128)*NB]);
/* now copy back the crypted text into the buffer */
ptr = (uint32_t*) &cryptedText[0];
statePtr = (uint32_t*) &state[0];
for(i=0;i<NB;i++)
*ptr++ = *statePtr++;
}
