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DarkflameServer/thirdparty/raknet/Source/rijndael.cpp
Unknown 0545adfac3 Public release of the DLU server code! 
Have fun!
2021-12-05 18:54:36 +01:00

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// rijndael-alg-fst.c v2.0 August '99
// Optimised ANSI C code
// authors: v1.0: Antoon Bosselaers
// v2.0: Vincent Rijmen
/*
* taken from the 'aescrypt' project: www.sf.net/projects/aescrypt
* See LICENSE-EST for the license applicable to this file
*/
// 14.Dec.2005 Cirilo: Removed silly hex keys; keys are now effectively unsigned char.
// KevinJ - TODO - What the hell is __UNUS? It causes DevCPP not to compile. I don't know what this is for so I'm taking it out entirely
/*
#if (defined(__GNUC__) || defined(__GCCXML__))
#define __UNUS __attribute__((unused))
#else
*/
#define __UNUS
//#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Rijndael.h"
// KevinJ - Added this to just generate a random initialization vector
#include "Rand.h"
#define SC ((BC - 4) >> 1)
#include "Rijndael-Boxes.h"
static int ROUNDS;
static word8 shifts[3][4][2] = {
{
{0, 0},
{1, 3},
{2, 2},
{3, 1}
},
{
{0, 0},
{1, 5},
{2, 4},
{3, 3}
},
{
{0, 0},
{1, 7},
{3, 5},
{4, 4}
}
};
word8 mul(word8 a, word8 b) {
// multiply two elements of GF(2^m)
// needed for MixColumn and InvMixColumn
if (a && b)
return Alogtable[(Logtable[a] + Logtable[b])%255];
else
return 0;
}
void KeyAddition(word8 a[4][4], word8 rk[4][4], word8 BC) {
// XOR corresponding text input and round key input bytes
int i, j;
for(i = 0; i < BC; i++)
for(j = 0; j < 4; j++)
a[i][j] ^= rk[i][j];
}
void ShiftRow(word8 a[4][4], word8 d, word8 BC) {
// Row 0 remains unchanged
// The other three rows are shifted a variable amount
word8 tmp[4];
int i, j;
for(i = 1; i < 4; i++) {
for(j = 0; j < BC; j++)
tmp[j] = a[(j + shifts[SC][i][d]) % BC][i];
for(j = 0; j < BC; j++)
a[j][i] = tmp[j];
}
}
void Substitution(word8 a[4][4], word8 box[256], word8 BC) {
// Replace every byte of the input by the byte at that place
// in the nonlinear S-box
int i, j;
for(i = 0; i < BC; i++)
for(j = 0; j < 4; j++)
a[i][j] = box[a[i][j]] ;
}
void MixColumn(word8 a[4][4], word8 BC) {
// Mix the four bytes of every column in a linear way
word8 b[4][4];
int i, j;
for(j = 0; j < BC; j++)
for(i = 0; i < 4; i++)
b[j][i] = mul(2,a[j][i])
^ mul(3,a[j][(i + 1) % 4])
^ a[j][(i + 2) % 4]
^ a[j][(i + 3) % 4];
for(i = 0; i < 4; i++)
for(j = 0; j < BC; j++)
a[j][i] = b[j][i];
}
void InvMixColumn(word8 a[4][4], word8 BC) {
// Mix the four bytes of every column in a linear way
// This is the opposite operation of Mixcolumn
int j;
for(j = 0; j < BC; j++)
*((word32*)a[j]) = *((word32*)U1[a[j][0]])
^ *((word32*)U2[a[j][1]])
^ *((word32*)U3[a[j][2]])
^ *((word32*)U4[a[j][3]]);
}
int rijndaelKeySched (word8 k[MAXKC][4], int keyBits __UNUS, word8 W[MAXROUNDS+1][4][4])
{
(void) keyBits;
// Calculate the necessary round keys
// The number of calculations depends on keyBits and blockBits
int j, r, t, rconpointer = 0;
word8 tk[MAXKC][4];
int KC = ROUNDS - 6;
for(j = KC-1; j >= 0; j--)
*((word32*)tk[j]) = *((word32*)k[j]);
r = 0;
t = 0;
// copy values into round key array
for(j = 0; (j < KC) && (r < (ROUNDS+1)); ) {
for (; (j < KC) && (t < 4); j++, t++)
*((word32*)W[r][t]) = *((word32*)tk[j]);
if (t == 4) {
r++;
t = 0;
}
}
while (r < (ROUNDS+1)) { // while not enough round key material calculated
// calculate new values
tk[0][0] ^= S[tk[KC-1][1]];
tk[0][1] ^= S[tk[KC-1][2]];
tk[0][2] ^= S[tk[KC-1][3]];
tk[0][3] ^= S[tk[KC-1][0]];
tk[0][0] ^= rcon[rconpointer++];
if (KC != 8)
for(j = 1; j < KC; j++)
*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
else {
for(j = 1; j < KC/2; j++)
*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
tk[KC/2][0] ^= S[tk[KC/2 - 1][0]];
tk[KC/2][1] ^= S[tk[KC/2 - 1][1]];
tk[KC/2][2] ^= S[tk[KC/2 - 1][2]];
tk[KC/2][3] ^= S[tk[KC/2 - 1][3]];
for(j = KC/2 + 1; j < KC; j++)
*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
}
// copy values into round key array
for(j = 0; (j < KC) && (r < (ROUNDS+1)); ) {
for (; (j < KC) && (t < 4); j++, t++)
*((word32*)W[r][t]) = *((word32*)tk[j]);
if (t == 4) {
r++;
t = 0;
}
}
}
return 0;
}
int rijndaelKeyEnctoDec (int keyBits __UNUS, word8 W[MAXROUNDS+1][4][4])
{
(void) keyBits;
int r;
for (r = 1; r < ROUNDS; r++) {
InvMixColumn(W[r], 4);
}
return 0;
}
int rijndaelEncrypt (word8 a[16], word8 b[16], word8 rk[MAXROUNDS+1][4][4])
{
// Encryption of one block.
int r;
word8 temp[4][4];
*((word32*)temp[0]) = *((word32*)a) ^ *((word32*)rk[0][0]);
*((word32*)temp[1]) = *((word32*)(a+4)) ^ *((word32*)rk[0][1]);
*((word32*)temp[2]) = *((word32*)(a+8)) ^ *((word32*)rk[0][2]);
*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[0][3]);
*((word32*)b) = *((word32*)T1[temp[0][0]])
^ *((word32*)T2[temp[1][1]])
^ *((word32*)T3[temp[2][2]])
^ *((word32*)T4[temp[3][3]]);
*((word32*)(b+4)) = *((word32*)T1[temp[1][0]])
^ *((word32*)T2[temp[2][1]])
^ *((word32*)T3[temp[3][2]])
^ *((word32*)T4[temp[0][3]]);
*((word32*)(b+8)) = *((word32*)T1[temp[2][0]])
^ *((word32*)T2[temp[3][1]])
^ *((word32*)T3[temp[0][2]])
^ *((word32*)T4[temp[1][3]]);
*((word32*)(b+12)) = *((word32*)T1[temp[3][0]])
^ *((word32*)T2[temp[0][1]])
^ *((word32*)T3[temp[1][2]])
^ *((word32*)T4[temp[2][3]]);
for(r = 1; r < ROUNDS-1; r++) {
*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[r][0]);
*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[r][1]);
*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[r][2]);
*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
*((word32*)b) = *((word32*)T1[temp[0][0]])
^ *((word32*)T2[temp[1][1]])
^ *((word32*)T3[temp[2][2]])
^ *((word32*)T4[temp[3][3]]);
*((word32*)(b+4)) = *((word32*)T1[temp[1][0]])
^ *((word32*)T2[temp[2][1]])
^ *((word32*)T3[temp[3][2]])
^ *((word32*)T4[temp[0][3]]);
*((word32*)(b+8)) = *((word32*)T1[temp[2][0]])
^ *((word32*)T2[temp[3][1]])
^ *((word32*)T3[temp[0][2]])
^ *((word32*)T4[temp[1][3]]);
*((word32*)(b+12)) = *((word32*)T1[temp[3][0]])
^ *((word32*)T2[temp[0][1]])
^ *((word32*)T3[temp[1][2]])
^ *((word32*)T4[temp[2][3]]);
}
// last round is special
*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[ROUNDS-1][0]);
*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[ROUNDS-1][1]);
*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[ROUNDS-1][2]);
*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[ROUNDS-1][3]);
b[0] = T1[temp[0][0]][1];
b[1] = T1[temp[1][1]][1];
b[2] = T1[temp[2][2]][1];
b[3] = T1[temp[3][3]][1];
b[4] = T1[temp[1][0]][1];
b[5] = T1[temp[2][1]][1];
b[6] = T1[temp[3][2]][1];
b[7] = T1[temp[0][3]][1];
b[8] = T1[temp[2][0]][1];
b[9] = T1[temp[3][1]][1];
b[10] = T1[temp[0][2]][1];
b[11] = T1[temp[1][3]][1];
b[12] = T1[temp[3][0]][1];
b[13] = T1[temp[0][1]][1];
b[14] = T1[temp[1][2]][1];
b[15] = T1[temp[2][3]][1];
*((word32*)b) ^= *((word32*)rk[ROUNDS][0]);
*((word32*)(b+4)) ^= *((word32*)rk[ROUNDS][1]);
*((word32*)(b+8)) ^= *((word32*)rk[ROUNDS][2]);
*((word32*)(b+12)) ^= *((word32*)rk[ROUNDS][3]);
return 0;
}
int rijndaelEncryptRound (word8 a[4][4],
word8 rk[MAXROUNDS+1][4][4], int rounds)
// Encrypt only a certain number of rounds.
// Only used in the Intermediate Value Known Answer Test.
{
int r;
word8 temp[4][4];
// make number of rounds sane
if (rounds > ROUNDS) rounds = ROUNDS;
*((word32*)a[0]) = *((word32*)a[0]) ^ *((word32*)rk[0][0]);
*((word32*)a[1]) = *((word32*)a[1]) ^ *((word32*)rk[0][1]);
*((word32*)a[2]) = *((word32*)a[2]) ^ *((word32*)rk[0][2]);
*((word32*)a[3]) = *((word32*)a[3]) ^ *((word32*)rk[0][3]);
for(r = 1; (r <= rounds) && (r < ROUNDS); r++) {
*((word32*)temp[0]) = *((word32*)T1[a[0][0]])
^ *((word32*)T2[a[1][1]])
^ *((word32*)T3[a[2][2]])
^ *((word32*)T4[a[3][3]]);
*((word32*)temp[1]) = *((word32*)T1[a[1][0]])
^ *((word32*)T2[a[2][1]])
^ *((word32*)T3[a[3][2]])
^ *((word32*)T4[a[0][3]]);
*((word32*)temp[2]) = *((word32*)T1[a[2][0]])
^ *((word32*)T2[a[3][1]])
^ *((word32*)T3[a[0][2]])
^ *((word32*)T4[a[1][3]]);
*((word32*)temp[3]) = *((word32*)T1[a[3][0]])
^ *((word32*)T2[a[0][1]])
^ *((word32*)T3[a[1][2]])
^ *((word32*)T4[a[2][3]]);
*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[r][0]);
*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[r][1]);
*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[r][2]);
*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[r][3]);
}
if (rounds == ROUNDS) {
// last round is special
temp[0][0] = T1[a[0][0]][1];
temp[0][1] = T1[a[1][1]][1];
temp[0][2] = T1[a[2][2]][1];
temp[0][3] = T1[a[3][3]][1];
temp[1][0] = T1[a[1][0]][1];
temp[1][1] = T1[a[2][1]][1];
temp[1][2] = T1[a[3][2]][1];
temp[1][3] = T1[a[0][3]][1];
temp[2][0] = T1[a[2][0]][1];
temp[2][1] = T1[a[3][1]][1];
temp[2][2] = T1[a[0][2]][1];
temp[2][3] = T1[a[1][3]][1];
temp[3][0] = T1[a[3][0]][1];
temp[3][1] = T1[a[0][1]][1];
temp[3][2] = T1[a[1][2]][1];
temp[3][3] = T1[a[2][3]][1];
*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[ROUNDS][0]);
*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[ROUNDS][1]);
*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[ROUNDS][2]);
*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[ROUNDS][3]);
}
return 0;
}
int rijndaelDecrypt (word8 a[16], word8 b[16], word8 rk[MAXROUNDS+1][4][4])
{
int r;
word8 temp[4][4];
*((word32*)temp[0]) = *((word32*)a) ^ *((word32*)rk[ROUNDS][0]);
*((word32*)temp[1]) = *((word32*)(a+4)) ^ *((word32*)rk[ROUNDS][1]);
*((word32*)temp[2]) = *((word32*)(a+8)) ^ *((word32*)rk[ROUNDS][2]);
*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[ROUNDS][3]);
*((word32*)b) = *((word32*)T5[temp[0][0]])
^ *((word32*)T6[temp[3][1]])
^ *((word32*)T7[temp[2][2]])
^ *((word32*)T8[temp[1][3]]);
*((word32*)(b+4)) = *((word32*)T5[temp[1][0]])
^ *((word32*)T6[temp[0][1]])
^ *((word32*)T7[temp[3][2]])
^ *((word32*)T8[temp[2][3]]);
*((word32*)(b+8)) = *((word32*)T5[temp[2][0]])
^ *((word32*)T6[temp[1][1]])
^ *((word32*)T7[temp[0][2]])
^ *((word32*)T8[temp[3][3]]);
*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
^ *((word32*)T6[temp[2][1]])
^ *((word32*)T7[temp[1][2]])
^ *((word32*)T8[temp[0][3]]);
for(r = ROUNDS-1; r > 1; r--) {
*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[r][0]);
*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[r][1]);
*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[r][2]);
*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
*((word32*)b) = *((word32*)T5[temp[0][0]])
^ *((word32*)T6[temp[3][1]])
^ *((word32*)T7[temp[2][2]])
^ *((word32*)T8[temp[1][3]]);
*((word32*)(b+4)) = *((word32*)T5[temp[1][0]])
^ *((word32*)T6[temp[0][1]])
^ *((word32*)T7[temp[3][2]])
^ *((word32*)T8[temp[2][3]]);
*((word32*)(b+8)) = *((word32*)T5[temp[2][0]])
^ *((word32*)T6[temp[1][1]])
^ *((word32*)T7[temp[0][2]])
^ *((word32*)T8[temp[3][3]]);
*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
^ *((word32*)T6[temp[2][1]])
^ *((word32*)T7[temp[1][2]])
^ *((word32*)T8[temp[0][3]]);
}
// last round is special
*((word32*)temp[0]) = *((word32*)b) ^ *((word32*)rk[1][0]);
*((word32*)temp[1]) = *((word32*)(b+4)) ^ *((word32*)rk[1][1]);
*((word32*)temp[2]) = *((word32*)(b+8)) ^ *((word32*)rk[1][2]);
*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[1][3]);
b[0] = S5[temp[0][0]];
b[1] = S5[temp[3][1]];
b[2] = S5[temp[2][2]];
b[3] = S5[temp[1][3]];
b[4] = S5[temp[1][0]];
b[5] = S5[temp[0][1]];
b[6] = S5[temp[3][2]];
b[7] = S5[temp[2][3]];
b[8] = S5[temp[2][0]];
b[9] = S5[temp[1][1]];
b[10] = S5[temp[0][2]];
b[11] = S5[temp[3][3]];
b[12] = S5[temp[3][0]];
b[13] = S5[temp[2][1]];
b[14] = S5[temp[1][2]];
b[15] = S5[temp[0][3]];
*((word32*)b) ^= *((word32*)rk[0][0]);
*((word32*)(b+4)) ^= *((word32*)rk[0][1]);
*((word32*)(b+8)) ^= *((word32*)rk[0][2]);
*((word32*)(b+12)) ^= *((word32*)rk[0][3]);
return 0;
}
int rijndaelDecryptRound (word8 a[4][4],
word8 rk[MAXROUNDS+1][4][4], int rounds)
// Decrypt only a certain number of rounds.
// Only used in the Intermediate Value Known Answer Test.
// Operations rearranged such that the intermediate values
// of decryption correspond with the intermediate values
// of encryption.
{
int r;
// make number of rounds sane
if (rounds > ROUNDS) rounds = ROUNDS;
// First the special round:
// without InvMixColumn
// with extra KeyAddition
KeyAddition(a,rk[ROUNDS],4);
Substitution(a,Si,4);
ShiftRow(a,1,4);
// ROUNDS-1 ordinary rounds
for(r = ROUNDS-1; r > rounds; r--) {
KeyAddition(a,rk[r],4);
InvMixColumn(a,4);
Substitution(a,Si,4);
ShiftRow(a,1,4);
}
if (rounds == 0) {
// End with the extra key addition
KeyAddition(a,rk[0],4);
}
return 0;
}
/*** End Rijndael algorithm, Begin the AES Interface ***/
int makeKey(keyInstance *key, BYTE direction, int keyByteLen, char *keyMaterial)
{
word8 k[MAXKC][4];
int i;
int keyLen = keyByteLen*8;
if (key == NULL) {
return BAD_KEY_INSTANCE;
}
if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
key->direction = direction;
} else {
return BAD_KEY_DIR;
}
if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
key->keyLen = keyLen;
} else {
return BAD_KEY_MAT;
}
if ( keyMaterial ) {
strncpy(key->keyMaterial, keyMaterial, keyByteLen);
} else {
return BAD_KEY_MAT;
}
ROUNDS = keyLen/32 + 6;
// initialize key schedule:
for(i = 0; i < key->keyLen/8; i++) {
k[i / 4][i % 4] = (word8) key->keyMaterial[i];
}
rijndaelKeySched (k, key->keyLen, key->keySched);
if (direction == DIR_DECRYPT)
rijndaelKeyEnctoDec (key->keyLen, key->keySched);
return TRUE;
}
int cipherInit(cipherInstance *cipher, BYTE mode, char *IV)
{
int i;
if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
cipher->mode = mode;
} else {
return BAD_CIPHER_MODE;
}
if (IV != NULL) {
for(i = 0; i < 16; i++) cipher->IV[i] = IV[i];
}
else
{
// KevinJ - Added this to just generate a random initialization vector
for(i = 0; i < 16; i++)
cipher->IV[i]=(BYTE)randomMT();
}
return TRUE;
}
int blockEncrypt(cipherInstance *cipher,
keyInstance *key, BYTE *input, int inputByteLen, BYTE *outBuffer)
{
int i, k, numBlocks;
word8 block[16], iv[4][4];
int inputLen = inputByteLen*8;
if (cipher == NULL ||
key == NULL ||
key->direction == DIR_DECRYPT) {
return BAD_CIPHER_STATE;
}
numBlocks = inputLen/128;
switch (cipher->mode) {
case MODE_ECB:
for (i = numBlocks; i > 0; i--) {
rijndaelEncrypt (input, outBuffer, key->keySched);
input += 16;
outBuffer += 16;
}
break;
case MODE_CBC:
#if STRICT_ALIGN
memcpy(block,cipher->IV,16);
#else
*((word32*)block) = *((word32*)(cipher->IV));
*((word32*)(block+4)) = *((word32*)(cipher->IV+4));
*((word32*)(block+8)) = *((word32*)(cipher->IV+8));
*((word32*)(block+12)) = *((word32*)(cipher->IV+12));
#endif
for (i = numBlocks; i > 0; i--) {
*((word32*)block) ^= *((word32*)(input));
*((word32*)(block+4)) ^= *((word32*)(input+4));
*((word32*)(block+8)) ^= *((word32*)(input+8));
*((word32*)(block+12)) ^= *((word32*)(input+12));
rijndaelEncrypt (block, outBuffer, key->keySched);
input += 16;
outBuffer += 16;
}
break;
case MODE_CFB1:
#if STRICT_ALIGN
memcpy(iv,cipher->IV,16);
#else
*((word32*)iv[0]) = *((word32*)(cipher->IV));
*((word32*)iv[1]) = *((word32*)(cipher->IV+4));
*((word32*)iv[2]) = *((word32*)(cipher->IV+8));
*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
#endif
for (i = numBlocks; i > 0; i--) {
for (k = 0; k < 128; k++) {
*((word32*)block) = *((word32*)iv[0]);
*((word32*)(block+4)) = *((word32*)iv[1]);
*((word32*)(block+8)) = *((word32*)iv[2]);
*((word32*)(block+12)) = *((word32*)iv[3]);
rijndaelEncrypt (block, block, key->keySched);
outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
iv[3][3] = (word8)((iv[3][3] << 1) | (outBuffer[k/8] >> (7-(k&7))) & 1);
}
}
break;
default:
return BAD_CIPHER_STATE;
}
return numBlocks*128;
}
int blockDecrypt(cipherInstance *cipher,
keyInstance *key, BYTE *input, int inputByteLen, BYTE *outBuffer)
{
int i, k, numBlocks;
word8 block[16], iv[4][4];
int inputLen = inputByteLen*8;
if (cipher == NULL ||
key == NULL ||
cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT) {
return BAD_CIPHER_STATE;
}
numBlocks = inputLen/128;
switch (cipher->mode) {
case MODE_ECB:
for (i = numBlocks; i > 0; i--) {
rijndaelDecrypt (input, outBuffer, key->keySched);
input += 16;
outBuffer += 16;
}
break;
case MODE_CBC:
// first block
rijndaelDecrypt (input, block, key->keySched);
#if STRICT_ALIGN
memcpy(outBuffer,cipher->IV,16);
*((word32*)(outBuffer)) ^= *((word32*)block);
*((word32*)(outBuffer+4)) ^= *((word32*)(block+4));
*((word32*)(outBuffer+8)) ^= *((word32*)(block+8));
*((word32*)(outBuffer+12)) ^= *((word32*)(block+12));
#else
*((word32*)(outBuffer)) = *((word32*)block) ^ *((word32*)(cipher->IV));
*((word32*)(outBuffer+4)) = *((word32*)(block+4)) ^ *((word32*)(cipher->IV+4));
*((word32*)(outBuffer+8)) = *((word32*)(block+8)) ^ *((word32*)(cipher->IV+8));
*((word32*)(outBuffer+12)) = *((word32*)(block+12)) ^ *((word32*)(cipher->IV+12));
#endif
// next blocks
for (i = numBlocks-1; i > 0; i--) {
rijndaelDecrypt (input, block, key->keySched);
*((word32*)(outBuffer+16)) = *((word32*)block) ^
*((word32*)(input-16));
*((word32*)(outBuffer+20)) = *((word32*)(block+4)) ^
*((word32*)(input-12));
*((word32*)(outBuffer+24)) = *((word32*)(block+8)) ^
*((word32*)(input-8));
*((word32*)(outBuffer+28)) = *((word32*)(block+12)) ^
*((word32*)(input-4));
input += 16;
outBuffer += 16;
}
break;
case MODE_CFB1:
#if STRICT_ALIGN
memcpy(iv,cipher->IV,16);
#else
*((word32*)iv[0]) = *((word32*)(cipher->IV));
*((word32*)iv[1]) = *((word32*)(cipher->IV+4));
*((word32*)iv[2]) = *((word32*)(cipher->IV+8));
*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
#endif
for (i = numBlocks; i > 0; i--) {
for (k = 0; k < 128; k++) {
*((word32*)block) = *((word32*)iv[0]);
*((word32*)(block+4)) = *((word32*)iv[1]);
*((word32*)(block+8)) = *((word32*)iv[2]);
*((word32*)(block+12)) = *((word32*)iv[3]);
rijndaelEncrypt (block, block, key->keySched);
iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
iv[3][3] = (word8)((iv[3][3] << 1) | (input[k/8] >> (7-(k&7))) & 1);
outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
}
}
break;
default:
return BAD_CIPHER_STATE;
}
return numBlocks*128;
}
/**
* cipherUpdateRounds:
*
* Encrypts/Decrypts exactly one full block a specified number of rounds.
* Only used in the Intermediate Value Known Answer Test.
*
* Returns:
* TRUE - on success
* BAD_CIPHER_STATE - cipher in bad state (e.g., not initialized)
*/
int cipherUpdateRounds(cipherInstance *cipher,
keyInstance *key, BYTE *input, int inputLen __UNUS, BYTE *outBuffer, int rounds)
{
(void) inputLen;
int j;
word8 block[4][4];
if (cipher == NULL ||
key == NULL) {
return BAD_CIPHER_STATE;
}
for (j = 3; j >= 0; j--) {
// parse input stream into rectangular array
*((word32*)block[j]) = *((word32*)(input+4*j));
}
switch (key->direction) {
case DIR_ENCRYPT:
rijndaelEncryptRound (block, key->keySched, rounds);
break;
case DIR_DECRYPT:
rijndaelDecryptRound (block, key->keySched, rounds);
break;
default: return BAD_KEY_DIR;
}
for (j = 3; j >= 0; j--) {
// parse rectangular array into output ciphertext bytes
*((word32*)(outBuffer+4*j)) = *((word32*)block[j]);
}
return TRUE;
}
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