/* Generate current and previous connection id for ip */
static void udp_make_connectionid( uint32_t connid[2], const ot_ip6 remoteip, int age ) {
uint32_t plain[4], crypt[4];
int i;
if( g_now_minutes + 60 > g_hour_of_the_key ) {
g_hour_of_the_key = g_now_minutes;
g_key_of_the_hour[1] = g_key_of_the_hour[0];
g_key_of_the_hour[0] = random();
}
memcpy( plain, remoteip, sizeof( plain ) );
for( i=0; i<4; ++i ) plain[i] ^= g_key_of_the_hour[age];
rijndaelEncrypt128( g_rijndael_round_key, (uint8_t*)remoteip, (uint8_t*)crypt );
connid[0] = crypt[0] ^ crypt[1];
connid[1] = crypt[2] ^ crypt[3];
}
int aesBlockEncrypt128(MV_U8 mode, MV_U8 *IV, MV_U8 *expandedKey, int keyLen,
MV_U32 *plain, int numBlocks, MV_U32 *cipher)
{
int i, j, t;
MV_U8 block[4][MAXBC];
int rounds;
char *input, *outBuffer;
input = (char*)plain;
outBuffer = (char*)cipher;
/* check parameter consistency: */
if( (expandedKey == NULL) || ((keyLen != 128) && (keyLen != 192) && (keyLen != 256)))
{
return AES_BAD_KEY_MAT;
}
if ((mode != MODE_ECB && mode != MODE_CBC))
{
return AES_BAD_CIPHER_STATE;
}
switch (keyLen)
{
case 128: rounds = 10; break;
case 192: rounds = 12; break;
case 256: rounds = 14; break;
default : return (-3); /* this cannot happen */
}
switch (mode)
{
case MODE_ECB:
for (i = 0; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse input stream into rectangular array */
block[t][j] = input[16*i+4*j+t] & 0xFF;
}
rijndaelEncrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
outBuffer[16*i+4*j+t] = (MV_U8) block[t][j];
}
}
break;
case MODE_CBC:
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse initial value into rectangular array */
block[t][j] = IV[t+4*j] & 0xFF;
}
for (i = 0; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse input stream into rectangular array and exor with
IV or the previous ciphertext */
block[t][j] ^= input[16*i+4*j+t] & 0xFF;
}
rijndaelEncrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
outBuffer[16*i+4*j+t] = (MV_U8) block[t][j];
}
}
break;
default: return AES_BAD_CIPHER_STATE;
}
return 0;
}